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JP6420637B2 - Radiation measuring apparatus and measuring method thereof - Google Patents
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JP6420637B2 - Radiation measuring apparatus and measuring method thereof - Google Patents

Radiation measuring apparatus and measuring method thereof Download PDF

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JP6420637B2
JP6420637B2 JP2014235145A JP2014235145A JP6420637B2 JP 6420637 B2 JP6420637 B2 JP 6420637B2 JP 2014235145 A JP2014235145 A JP 2014235145A JP 2014235145 A JP2014235145 A JP 2014235145A JP 6420637 B2 JP6420637 B2 JP 6420637B2
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克宜 上野
克宜 上野
和生 富永
和生 富永
田所 孝広
孝広 田所
耕一 岡田
耕一 岡田
名雲 靖
名雲  靖
良知 高橋
良知 高橋
幸治 石澤
幸治 石澤
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Hitachi GE Vernova Nuclear Energy Ltd
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Description

本発明は放射線計測装置及びその計測方法に係り、放射線照射中の光刺激ルミネセンス(OSL:Optically Stimulated Luminescence)素子に、光源からの光を連続して照射することで発する蛍光を光ファイバで伝送し、計数率計で光強度の時刻推移として計測し、この光強度から線量率を換算することで線量率計測を実現する放射線計測装置及びその計測方法に関する。   The present invention relates to a radiation measurement apparatus and a measurement method thereof, and transmits fluorescence emitted by continuously irradiating light from a light source to an optically stimulated luminescence (OSL) element during irradiation with an optical fiber. In addition, the present invention relates to a radiation measurement apparatus that measures a light intensity with time by a counting rate meter and converts the dose rate from the light intensity to realize a dose rate measurement and a measurement method thereof.

放射線による照射線量率を計測する放射線検出器として、電離箱、GM(ガイガーミュラー)計数管、シンチレーション検出器、半導体検出器等の検出器がエリアモニタ、プロセスモニタ、サーベイメータ等の線量率モニタとして広く利用されている。また、蛍光ガラス線量計、熱ルミネセンス線量計、光刺激ルミネセンス(OSL)線量計が個人被曝管理やイメージングプレートとして利用されている。   Detectors such as ionization chambers, GM (Geiger-Muller) counters, scintillation detectors, and semiconductor detectors are widely used as dose rate monitors for area monitors, process monitors, survey meters, etc. It's being used. In addition, fluorescent glass dosimeters, thermoluminescence dosimeters, and photostimulated luminescence (OSL) dosimeters are used as personal exposure management and imaging plates.

これらの線量率モニタ、個人線量計及びイメージングプレートは、主に原子力発電プラントや核燃料再処理施設、放射性同位元素を使用する医療施設、産業施設、研究用加速器施設、一般環境モニタリング装置等で利用されている。   These dose rate monitors, personal dosimeters, and imaging plates are mainly used in nuclear power plants, nuclear fuel reprocessing facilities, medical facilities that use radioisotopes, industrial facilities, research accelerator facilities, general environmental monitoring devices, etc. ing.

上述の電離箱、GM計数管、シンチレーション検出器、半導体検出器を動作させるには、数Vから数1、000Vの印加電圧を供給し、放射線と検出器との相互作用に伴って生じる電気信号を後段の計測装置で計測する必要がある。また、上記した各種施設においては、通常の運転状況でこれらの検出器による線量モニタリングは問題ないが、停電等によって電源供給ができなくなくなる場合、線量率を計測することは困難である。   In order to operate the above ion chamber, GM counter, scintillation detector, and semiconductor detector, an applied voltage of several volts to several thousand volts is supplied, and an electric signal generated by the interaction between radiation and the detector. Need to be measured with a measuring device in the subsequent stage. In the various facilities described above, there is no problem with dose monitoring using these detectors under normal operating conditions, but it is difficult to measure the dose rate when power supply cannot be performed due to a power failure or the like.

検出部への電源供給が不要な放射線計測手段として、シンチレーション素子やOSL素子と光ファイバを利用した線量率モニタがある。これは、光ファイバの先端にシンチレーション素子を接続し、光ファイバを介して後段の光検出器で電気信号に変換、分析するものである。代表的なシンチレーション素子はNaI(Tl)、BGO、GSO等があり、放射線との相互作用が起こった直後に放射する光の強度を計測することで、線量率や放射線エネルギー等を分析可能である。   As a radiation measurement means that does not require power supply to the detection unit, there is a dose rate monitor using a scintillation element, an OSL element, and an optical fiber. In this method, a scintillation element is connected to the tip of an optical fiber, and it is converted into an electrical signal and analyzed by a subsequent photodetector through the optical fiber. Typical scintillation elements include NaI (Tl), BGO, GSO, etc., and the dose rate, radiation energy, etc. can be analyzed by measuring the intensity of light emitted immediately after interaction with radiation occurs. .

OSL素子は、カラーセンタの形成量が積算線量と比例関係であることを利用し、光源による刺激光で励起状態から基底状態に遷移する際に放射するOSL光の強度を計測することで、照射された線量を分析可能である。高感度の線量率計測を実現する場合は、照射線量を蓄積可能なOSL素子がSN比の観点で有利である。   The OSL element utilizes the fact that the amount of color center formation is proportional to the integrated dose, and measures the intensity of the OSL light emitted when transitioning from the excited state to the ground state by stimulating light from the light source. Can be analyzed. When realizing a highly sensitive dose rate measurement, an OSL element capable of storing an irradiation dose is advantageous in terms of the SN ratio.

これら光ファイバを利用した線量率モニタを各施設で適用するには、1分程度の計測周期で6桁以上の広い線量率レンジを計測する必要がある。これを実現する方法として、2種類の感度を有する素子を同じ測定点に設ける手段がある。   In order to apply a dose rate monitor using these optical fibers at each facility, it is necessary to measure a wide dose rate range of 6 digits or more in a measurement cycle of about 1 minute. As a method for realizing this, there is means for providing elements having two types of sensitivity at the same measurement point.

しかしながら、この2種類の感度を有する素子を同じ測定点に設ける方式では、検出器部分の容量が大きくなってしまい、設置スペース等の関係から各施設での適用が困難となる。   However, in the method in which elements having these two types of sensitivity are provided at the same measurement point, the capacity of the detector portion is increased, making it difficult to apply in each facility due to the installation space and the like.

これらの背景から、光ファイバを用いるモニタ構成で、かつ、簡素な検出器構成で、しかも広いダイナミックレンジに対応可能な構成で線量率が計測できる放射線計測装置及びその方法が要求される。   Under these circumstances, there is a need for a radiation measuring apparatus and method capable of measuring a dose rate with a monitor configuration using an optical fiber, a simple detector configuration, and a configuration capable of handling a wide dynamic range.

特許文献1には、線量率計測システム及び線量率計測方法が記載され、OSL素子を光ファイバの先端に接続し、放射線照射中のOSL素子に任意のタイミングで刺激光を照射することでOSL由来の蛍光を発生させ、後段の計測装置で得られた時刻情報及び波高情報、計数値を利用して線量及び線量率を換算することを特徴としている。   Patent Document 1 describes a dose rate measurement system and a dose rate measurement method. An OSL element is connected to the tip of an optical fiber, and the OSL element being irradiated with radiation is irradiated with stimulus light at an arbitrary timing. And the dose and the dose rate are converted using time information, wave height information, and a count value obtained by a subsequent measurement apparatus.

一方、特許文献2には、放射線計測方法が記載され、放射線が照射されたOSL素子に長波長の励起光と白色可視光又は短波長の励起光を照射し、OSL素子からの蛍光強度とOSL素子から発生する光子数を測定することで、広ダイナミックレンジで照射線量を計測することを特徴としている。   On the other hand, Patent Document 2 describes a radiation measurement method, in which an OSL element irradiated with radiation is irradiated with long-wavelength excitation light and white visible light or short-wavelength excitation light, and the fluorescence intensity and OSL from the OSL element. By measuring the number of photons generated from the element, the irradiation dose is measured in a wide dynamic range.

特開2013−134157号公報JP 2013-134157 A 特許5414028号公報Japanese Patent No. 5414028

上述した如く、光ファイバを用いた放射線検出器であって、広いダイナミックレンジでの線量率計測を実現する放射線計測装置及びその方法が必要である。   As described above, a radiation detector using an optical fiber and a radiation measuring apparatus and method for realizing dose rate measurement in a wide dynamic range are necessary.

ところが、特許文献1では、刺激光照射直後のOSL素子の蛍光による計数値ピークにおいて、任意の時刻指定領域及び波高指定領域における計数値を測定値とするものであり、高線量率下での測定時に、特許文献1の測定方法を適用する場合、計数値ピークのピーク値が計測装置の計数率上限を瞬間的に超え、数え落としが発生する可能性がある。このため、線量率レンジの上限値の向上が困難となる。   However, in Patent Document 1, at the peak of the count value due to the fluorescence of the OSL element immediately after the stimulation light irradiation, the count value in an arbitrary time designation region and wave height designation region is used as a measurement value, and measurement under a high dose rate is performed. Sometimes, when the measurement method of Patent Document 1 is applied, the peak value of the count value peak may momentarily exceed the upper limit of the count rate of the measuring device, and counting down may occur. For this reason, it becomes difficult to improve the upper limit of the dose rate range.

一方、特許文献2では、2種類の波長帯を有する2種類の光源と計測装置を用いることで、高い照射線量での測定を実現するものであるが、特許文献2の構成では、全ての機器を施設の測定点に設置する必要があり、更に、高線量率下にこれらの機器を設置した場合、放射線影響によってデータ信頼性を確保することが困難となる。また、特許文献2は、OSL素子に照射されている線量率をリアルタイムで計測することは想定されておらず、測定データから線量率を導出する手法に関する記載は見当たらない。   On the other hand, Patent Document 2 realizes measurement with a high irradiation dose by using two types of light sources and measuring devices having two types of wavelength bands. Must be installed at the measurement point of the facility, and when these devices are installed under a high dose rate, it is difficult to ensure data reliability due to radiation effects. Further, Patent Document 2 does not assume that the dose rate irradiated to the OSL element is measured in real time, and there is no description regarding a method for deriving the dose rate from the measurement data.

本発明は上述の点に鑑みなされたもので、その目的とするところは、光ファイバを用いた放射線検出器であって、広いダイナミックレンジでの線量率計測を実現することができる放射線計測装置及びその計測方法を提供することにある。   The present invention has been made in view of the above points, and an object thereof is a radiation detector using an optical fiber, and a radiation measuring apparatus capable of realizing dose rate measurement in a wide dynamic range and It is to provide a measurement method.

本発明の放射線計測装置は、上記目的を達成するために、放射線を検出する光輝尽蛍光素子と、該光輝尽蛍光素子から発せられる蛍光及び該光輝尽蛍光素子の刺激光を伝送する光ファイバと、前記蛍光と前記光輝尽蛍光素子の刺激光を弁別する光弁別器と、前記光輝尽蛍光素子の刺激光を連続して前記光輝尽蛍光素子に照射可能な光源と、前記光輝尽蛍光素子の刺激光の波長を減衰させ前記光輝尽蛍光素子の蛍光波長を透過するバンドパスフィルタと、該バンドパスフィルタを透過した光を電気信号に変換し、その電気信号をパルス形状或いは電流値として出力する光検出器と、該光検出器のパルス出力を計数し、計数率の時刻推移データを導出する計数率計と、該計数率計で導出した前記計数率の時刻推移データの出力平坦部を判定する波形解析装置と、該波形解析装置で判定した前記計数率の時刻推移データの出力平坦部の測定計数率から線量率を算出する線量率演算装置とを備え、放射線照射中の前記光輝尽蛍光素子に前記光源から前記刺激光を連続して照射し、前記刺激光照射中で、かつ、前記波形解析装置で判定した前記計数率の時刻推移データの前記出力平坦部の前記測定計数率と、予め設定した線量率換算係数と基づいて前記線量率を前記線量率演算装置で算出することを特徴とする。 In order to achieve the above object, the radiation measuring apparatus of the present invention includes a photoluminescent fluorescent element that detects radiation, an optical fiber that transmits fluorescence emitted from the photoluminescent fluorescent element and stimulation light of the photoluminescent fluorescent element, and A light discriminator for discriminating between the fluorescence and the stimulating light of the photostimulable fluorescent element, a light source capable of continuously irradiating the photostimulated fluorescent element with the stimulating light of the photostimulable fluorescent element, and A band-pass filter that attenuates the wavelength of the stimulating light and transmits the fluorescence wavelength of the photostimulable fluorescent element, converts the light transmitted through the band-pass filter into an electric signal, and outputs the electric signal as a pulse shape or a current value Photodetector, count rate meter for counting pulse output of the photodetector and deriving the time rate data of the count rate, and determining the output flat portion of the time rate data of the count rate derived by the count rate meter Wave An analysis device, and a dose rate calculation device that calculates a dose rate from a measurement count rate of an output flat portion of the time transition data of the count rate determined by the waveform analysis device, and The measurement count rate of the output flat part of the time transition data of the count rate that is irradiated with the stimulation light continuously from the light source, is irradiated with the stimulation light, and is determined by the waveform analyzer, and preset and calculates the dose rate at the dose rate calculation unit based on the the dose rate conversion factor.

また、本発明の放射線計測方法は、上記目的を達成するために、放射線を検出する光輝尽蛍光素子と、該光輝尽蛍光素子から発せられる蛍光及び該光輝尽蛍光素子の刺激光を伝送する光ファイバと、前記蛍光と前記光輝尽蛍光素子の刺激光を弁別する光弁別器と、前記光輝尽蛍光素子の刺激光を連続して前記光輝尽蛍光素子に照射可能な光源と、前記光輝尽蛍光素子の刺激光の波長を減衰させ前記光輝尽蛍光素子の蛍光波長を透過するバンドパスフィルタと、該バンドパスフィルタを透過した光を電気信号に変換し、その電気信号をパルス形状或いは電流値として出力する光検出器と、該光検出器のパルス出力を計数し、計数率の時刻推移データを導出する計数率計と、該計数率計で導出した前記計数率の時刻推移データの出力平坦部を判定する波形解析装置と、該波形解析装置で判定した前記計数率の時刻推移データの出力平坦部の測定計数率から線量率を算出する線量率演算装置とを備えた放射線計測装置で放射線を計測する際に、放射線照射中の前記光輝尽蛍光素子に前記光源から前記刺激光を連続して照射すると共に、前記刺激光照射中で、かつ、前記波形解析装置で判定した前記計数率の時刻推移データの前記出力平坦部の前記測定計数率と、予め設定した線量率換算係数とに基づいて前記線量率演算装置で前記線量率を算出することを特徴とする。   In order to achieve the above object, the radiation measuring method of the present invention includes a photostimulable fluorescent element that detects radiation, light emitted from the photostimulable fluorescent element, and light that transmits stimulation light of the photostimulated fluorescent element. A fiber, a light discriminator for discriminating between the fluorescence and the stimulating light of the photoluminescent fluorescent element, a light source capable of continuously irradiating the photoluminescent fluorescent element with the stimulating light of the photoluminescent fluorescent element, and the photoluminescent fluorescence A band-pass filter that attenuates the wavelength of the stimulating light of the element and transmits the fluorescence wavelength of the photostimulable fluorescent element, and converts the light transmitted through the band-pass filter into an electric signal, and the electric signal is converted into a pulse shape or a current value. Photodetector for output, count rate meter for counting pulse output of the photodetector and deriving time transition data of the count rate, and output flat portion of the time transition data of the count rate derived by the count rate meter Judgment Radiation is measured by a radiation measurement apparatus comprising: a waveform analyzer that calculates a dose rate from a measured count rate of an output flat portion of the time transition data of the count rate determined by the waveform analyzer At the same time, the stimulating fluorescent element during radiation irradiation is continuously irradiated with the stimulation light from the light source, and the time transition data of the counting rate determined during the stimulation light irradiation and determined by the waveform analyzer The dose rate is calculated by the dose rate calculation device based on the measurement count rate of the output flat portion and a preset dose rate conversion factor.

本発明によれば、光ファイバを用いた放射線検出器であって、広いダイナミックレンジでの線量率計測を実現することができる。   According to the present invention, a radiation detector using an optical fiber can realize dose rate measurement in a wide dynamic range.

本発明の放射線計測装置の実施例1を示す構成図である。It is a block diagram which shows Example 1 of the radiation measuring device of this invention. 本発明の放射線計測装置の実施例1に採用される放射線検出部を示す図である。It is a figure which shows the radiation detection part employ | adopted as Example 1 of the radiation measuring device of this invention. 本発明の放射線計測装置の実施例1における線量率演算フローを示す図である。It is a figure which shows the dose rate calculation flow in Example 1 of the radiation measuring device of this invention. 本発明の放射線計測装置の実施例1における光検出器の出力信号を示す特性図である。It is a characteristic view which shows the output signal of the photodetector in Example 1 of the radiation measuring device of this invention. 本発明の放射線計測装置の実施例1における刺激光照射開始時及び終了時の計数率の時刻推移を示す特性図である。It is a characteristic view which shows the time transition of the count rate at the time of the stimulus light irradiation start and the end in Example 1 of the radiation measuring apparatus of the present invention. 本発明の放射線計測装置の実施例1における線量率測定結果の時刻推移を示す特性図である。It is a characteristic view which shows the time transition of the dose rate measurement result in Example 1 of the radiation measuring device of this invention. 本発明の放射線計測装置の実施例2における線量率演算フローを示す図である。It is a figure which shows the dose rate calculation flow in Example 2 of the radiation measuring device of this invention. 本発明の放射線計測装置の実施例2における計数率の時刻推移を示す特性図である。It is a characteristic view which shows the time transition of the count rate in Example 2 of the radiation measuring device of this invention. 本発明の放射線計測装置の実施例2における線量率測定結果の時刻推移を示す特性図である。It is a characteristic view which shows the time transition of the dose rate measurement result in Example 2 of the radiation measuring device of this invention. 本発明の放射線計測装置の実施例3を示す構成図である。It is a block diagram which shows Example 3 of the radiation measuring device of this invention. 本発明の放射線計測装置の実施例3における微分波形を用いた出力平坦部の判定方法を示す図である。It is a figure which shows the determination method of the output flat part using the differential waveform in Example 3 of the radiation measuring device of this invention. 本発明の放射線計測装置の実施例4を示す構成図である。It is a block diagram which shows Example 4 of the radiation measuring device of this invention. 本発明の放射線計測装置の実施例4における刺激光照射開始時の計数率の時刻推移を示す特性図である。It is a characteristic view which shows the time transition of the count rate at the time of the stimulus light irradiation start in Example 4 of the radiation measuring device of the present invention. 本発明の放射線計測装置の実施例4における各方式で得られた測定線量率の線形性データを示す特性図である。It is a characteristic view which shows the linearity data of the measurement dose rate obtained by each system in Example 4 of the radiation measuring device of this invention.

以下、図示した実施例に基づいて本発明の放射線計測装置及びその計測方法を説明する。なお、各実施例において同一構成部品には同符号を使用ずる。   Hereinafter, the radiation measuring apparatus and measuring method of the present invention will be described based on the illustrated embodiments. In each embodiment, the same reference numerals are used for the same components.

図1乃至図6に、本発明の放射線計測装置及びその計測方法の実施例1を示す。   1 to 6 show a first embodiment of a radiation measuring apparatus and a measuring method thereof according to the present invention.

まず、図1及び図2を用いて放射線計測装置の構成を説明する。該図に示す如く、本実施例の放射線計測装置は、放射線検出部1の内部に備えられている光輝尽蛍光素子であるOSL素子13と、このOSL素子13から発せられる蛍光14及びOSL素子13の刺激光を伝送する光ファイバ2と、蛍光14とOSL素子13の刺激光を弁別する光弁別器3と、OSL素子13の刺激光を連続してOSL素子13に照射可能な光源4と、この光源4を制御する光源用制御装置5と、OSL素子13の刺激光の波長を減衰させOSL素子13の蛍光波長を透過するバンドパスフィルタ6と、このバンドパスフィルタ6を透過した光を電気信号に変換し、その電気信号をパルス形状或いは電流値として出力する光検出器7と、この光検出器7のパルス出力を計数し、計数率の時刻推移データを導出する計数率計8と、この計数率計8で導出した計数率の時刻推移データの出力平坦部を判定する波形解析装置9と、この波形解析装置9で判定した計数率の時刻推移データの出力平坦部の測定計数率から線量率を算出する線量率演算装置11と、この線量率演算装置11で得られた線量率データを表示する表示モニタ12とから概略構成されている。   First, the configuration of the radiation measuring apparatus will be described with reference to FIGS. 1 and 2. As shown in the figure, the radiation measuring apparatus according to the present embodiment includes an OSL element 13 that is a bright fluorescent element provided in the radiation detection unit 1, a fluorescence 14 emitted from the OSL element 13, and an OSL element 13. An optical fiber 2 that transmits the stimulation light of the light, a light discriminator 3 that discriminates the stimulation light of the fluorescence 14 and the OSL element 13, a light source 4 that can continuously irradiate the OSL element 13 with the stimulation light of the OSL element 13, The light source control device 5 that controls the light source 4, the band-pass filter 6 that attenuates the wavelength of the stimulation light of the OSL element 13 and transmits the fluorescence wavelength of the OSL element 13, and the light that has passed through the band-pass filter 6 is electrically A photodetector 7 that converts the signal into a signal and outputs the electrical signal as a pulse shape or current value, and a count rate meter that counts the pulse output of the photodetector 7 and derives time transition data of the count rate And a waveform analysis device 9 for determining the output flat portion of the time transition data of the count rate derived by the counting rate meter 8, and a measurement count of the output flat portion of the time transition data of the count rate determined by the waveform analysis device 9 The dose rate calculating device 11 that calculates the dose rate from the rate and the display monitor 12 that displays the dose rate data obtained by the dose rate calculating device 11 are roughly configured.

そして、本実施例の放射線計測装置は、放射線照射中のOSL素子13に光源4から刺激光を連続して照射し、刺激光照射中で、かつ、波形解析装置9で判定した計数率の時刻推移データの出力平坦部の測定計数率と、予め設定した線量率換算係数と基づいて線量率演算装置11で線量率を算出するものである。 The radiation measuring apparatus according to the present embodiment continuously irradiates the stimulation light from the light source 4 to the OSL element 13 that is being irradiated with radiation, and the time of the count rate determined by the waveform analysis apparatus 9 during the stimulation light irradiation. the measurement count rate output flat portion of the transition data, and calculates the dose rate at a dose rate calculation unit 11 based on the dose rate conversion factor set in advance.

更に、具体的に説明する。図2に示す如く、放射線検出部1の内部には、光輝尽蛍光素子であるOSL素子13が備えられている。このOSL素子13の蛍光14は、光ファイバ2を介して伝送された刺激光の入射によって等方的に放射する。この蛍光14の一部が光ファイバ2に入射し、光弁別器3まで伝送する。図2では一例として、OSL素子13と光ファイバ2との設置距離を一定の距離で離れて設置しているが、光ファイバ2に対してOSL素子13が光学接着する構成も実施可能である。   Furthermore, it demonstrates concretely. As shown in FIG. 2, an OSL element 13 that is a bright fluorescent element is provided inside the radiation detection unit 1. The fluorescence 14 of the OSL element 13 isotropically radiates when the stimulus light transmitted through the optical fiber 2 is incident. A part of the fluorescence 14 enters the optical fiber 2 and is transmitted to the optical discriminator 3. In FIG. 2, as an example, the installation distance between the OSL element 13 and the optical fiber 2 is set apart by a certain distance, but a configuration in which the OSL element 13 is optically bonded to the optical fiber 2 is also possible.

本実施例でのOSL素子13には、OSL素子13として広く知られているBaFBr:Eu、BaFBrI:Eu、Al:C、BaFl:Eu、NaCl:Cu、KCl:Eu、KBr:Eu、RbBr:Tl、SrS:Eu,Sm、CsS:Eu,Sm、CaS:Ce,Sm、MgS:Eu,Sm、MgS:Ce,Sm、MgO:Fe、ZnSiO:Mn、Ba(POO:Eu、25NaO、75B:Eu等のいずれかを用いる。 The OSL element 13 in this embodiment includes BaFBr: Eu, BaFBrI: Eu, Al 2 O 3 : C, BaFl: Eu, NaCl: Cu, KCl: Eu, and KBr: Eu widely known as the OSL element 13. , RbBr: Tl, SrS: Eu, Sm, CsS: Eu, Sm, CaS: Ce, Sm, MgS: Eu, Sm, MgS: Ce, Sm, MgO: Fe, Zn 2 SiO 4 : Mn, Ba 6 (PO 4 ) Any of 3 O: Eu, 25Na 2 O, 75B 2 O 3 : Eu, or the like is used.

また、光源4は、使用するOSL素子13特有の刺激光の波長を含むものとし、かつ、1秒以上連続して光を照射可能なものとする。光弁別器3は、OSL素子13の蛍光14の波長と刺激光の波長を弁別可能な光ミラーを備え、光検出器7にOSL素子13の蛍光14を伝送可能な組合せとする。バンドパスフィルタ6は、OSL素子13の蛍光14の波長を光検出器7に透過し、刺激光の波長等のバックグラウンドとなる光の透過を低減する機能を備える。光検出器7は、バンドパスフィルタ6を透過した光を電気信号に変換する機能を備え、電気信号をパルス形状や電流値として出力する。この光検出器7としては、例えば、光電子増倍管、フォトダイオード、アバランシェフォトダイオード等の一般的な光検出器を使用する。以降の説明では、一例として光検出器7の出力信号はパルス形状として説明するが、電流値計測としても後段の計数率計8を電流計とすることで同様の効果が得られる。   The light source 4 includes a wavelength of stimulation light unique to the OSL element 13 to be used, and can irradiate light continuously for 1 second or longer. The optical discriminator 3 includes an optical mirror capable of discriminating between the wavelength of the fluorescence 14 of the OSL element 13 and the wavelength of the stimulation light, and is a combination capable of transmitting the fluorescence 14 of the OSL element 13 to the photodetector 7. The band-pass filter 6 has a function of transmitting the wavelength of the fluorescence 14 of the OSL element 13 to the photodetector 7 and reducing the transmission of light serving as a background such as the wavelength of stimulation light. The photodetector 7 has a function of converting the light transmitted through the band-pass filter 6 into an electric signal, and outputs the electric signal as a pulse shape or a current value. As the photodetector 7, for example, a general photodetector such as a photomultiplier tube, a photodiode, or an avalanche photodiode is used. In the following description, the output signal of the photodetector 7 will be described as a pulse shape as an example. However, the same effect can be obtained by using the subsequent counting rate meter 8 as an ammeter for current value measurement.

計数率計8は、光検出器7で出力されたパルス信号を計数し、計数率の時刻推移を導出する機能を備える。計数率計8での計数方法として、光検出器7の出力パルスの各々のパルスの検出時刻、パルス波高値をオンラインで測定する方式がある。以降では一例として、この方法で計数率のデータ収集を実施するものとするが、任意の測定時間で積算した計数値から計数率を算出し、これを繰り返して計数率の時刻推移を導出する等、一般的な計数率の時刻推移の導出方法ならば本発明を実現できる。   The count rate meter 8 has a function of counting the pulse signal output from the photodetector 7 and deriving the time transition of the count rate. As a counting method in the counting rate meter 8, there is a method of measuring the detection time of each pulse of the output pulse of the photodetector 7 and the pulse peak value online. In the following, as an example, data collection of the count rate will be performed as an example. However, the count rate is calculated from the count value accumulated over an arbitrary measurement time, and this is repeated to derive the time transition of the count rate, etc. The present invention can be realized by a method for deriving a general counting rate time transition.

また、波形解析装置9は、刺激光照射中に計数率計8で得られた計数率の時刻推移データの出力平坦部を判定する機能を備える。線量率演算装置11は、制御信号ケーブル10を介して光源用制御装置5と接続されており、光源4における刺激光照射開始及び終了タイミングの情報を認識する機能を有する。また、線量率演算装置11は、刺激光照射開始及び終了タイミングの情報に基づいて得られた測定計数率と線量率換算係数を用いることで線量率を算出する機能を備える。ここでの線量率換算係数は、放射線計測装置で使用する機材の仕様に依存しており、線量率を導出するための校正値としての機能を備える。表示モニタ12は、線量率演算装置11で得られた線量率データを表示する機能を有する。   Moreover, the waveform analyzer 9 has a function of determining an output flat portion of the time transition data of the count rate obtained by the count rate meter 8 during the stimulation light irradiation. The dose rate calculation device 11 is connected to the light source control device 5 via the control signal cable 10, and has a function of recognizing information on the stimulus light irradiation start and end timing of the light source 4. In addition, the dose rate calculation device 11 has a function of calculating a dose rate by using a measurement count rate and a dose rate conversion coefficient obtained based on information on the stimulus light irradiation start and end timings. The dose rate conversion coefficient here depends on the specifications of the equipment used in the radiation measuring apparatus, and has a function as a calibration value for deriving the dose rate. The display monitor 12 has a function of displaying dose rate data obtained by the dose rate calculation device 11.

図3に、本発明の放射線計測装置の実施例1における線量率演算フローを示す。   FIG. 3 shows a dose rate calculation flow in the first embodiment of the radiation measuring apparatus of the present invention.

該図に示す如く、放射線検出器1を放射線照射環境に設置後、放射線照射が開始される(S1)。任意のタイミングで刺激光の照射を開始し(S2)、計数率時刻推移データを収集する(S3)。刺激光照射終了(S4)後に計数値ピークを演算し(S5)、出力平坦部の開始点を判定する(S6)。この判定に基づき、計数率の算出領域を決定し(S7)、計数率を算出する(S8)。この計数率から線量率を算出する(S9)。その後、再び刺激光を照射することで線量率の算出を開始する。   As shown in the figure, after the radiation detector 1 is installed in a radiation irradiation environment, radiation irradiation is started (S1). Irradiation of stimulation light is started at an arbitrary timing (S2), and count rate time transition data is collected (S3). After the stimulation light irradiation ends (S4), the count value peak is calculated (S5), and the start point of the output flat portion is determined (S6). Based on this determination, a count rate calculation region is determined (S7), and a count rate is calculated (S8). A dose rate is calculated from this count rate (S9). Thereafter, the dose rate is calculated by irradiating the stimulation light again.

図4に、本発明の放射線計測装置の実施例1における光検出器の出力信号を示す。   In FIG. 4, the output signal of the photodetector in Example 1 of the radiation measuring device of this invention is shown.

該図に示す如く、OSL素子13に刺激光を照射することで、ランダムにパルス出力16が生じる。これらのパルス出力16の内、計数率計8において波高弁別レベル15を超えるパルス出力16の検出タイミング17(t、tn+1、tn+2、・・・)及び波高値18(V、Vn+1、Vn+2、・・・)がデータとして収集される。 As shown in the figure, the pulse output 16 is randomly generated by irradiating the OSL element 13 with the stimulation light. Among these pulse outputs 16, the detection timing 17 (t n , t n + 1 , t n + 2 ,...) And the peak value 18 (V n , V n + 1 ) of the pulse output 16 exceeding the peak height discrimination level 15 in the counting rate meter 8. , V n + 2 ,...) Are collected as data.

図5に、本発明の放射線計測装置の実施例1における刺激光照射開始時及び終了時の計数率の時刻推移を示す。図5では、横軸を時刻、縦軸を単位時間当たりの計数率とすると共に2種類の計数率データとし、これは計数率計8で取得されるものである。   FIG. 5 shows the time transition of the count rate at the start and end of stimulation light irradiation in Example 1 of the radiation measurement apparatus of the present invention. In FIG. 5, the horizontal axis represents time, the vertical axis represents the count rate per unit time, and two types of count rate data are obtained by the count rate meter 8.

図5に示す計数率データ24は高線量率下での測定結果、計数率データ25は低線量率下での測定結果である。刺激光照射開始タイミング20の前にバックグラウンド計数率19を測定する。刺激光照射開始タイミング20の後に刺激光照射に伴う計数率ピーク23が発生し、計数率ピーク23は減衰を開始する。ここでの刺激光は、刺激光照射終了タイミング43までOSL素子13に照射される。出力平坦部開始タイミング26は、波形解析装置9において算出される。ここでは一例として、出力平坦部開始タイミング26を計数率ピーク23のピーク値から95%以上低下した測定点以降とする。出力平坦部開始タイミング26以降において、測定領域21が設けられる。   The count rate data 24 shown in FIG. 5 is a measurement result under a high dose rate, and the count rate data 25 is a measurement result under a low dose rate. The background count rate 19 is measured before the stimulus light irradiation start timing 20. After the stimulus light irradiation start timing 20, a count rate peak 23 accompanying the stimulus light irradiation occurs, and the count rate peak 23 starts to attenuate. The stimulation light here is irradiated to the OSL element 13 until the stimulation light irradiation end timing 43. The output flat portion start timing 26 is calculated by the waveform analyzer 9. Here, as an example, the output flat portion start timing 26 is set to be after the measurement point at which the peak value of the count rate peak 23 is reduced by 95% or more. The measurement area 21 is provided after the output flat portion start timing 26.

線量率演算装置11において、測定領域21における計数率データ24とバックグラウンド計数率19からネット計数率22が算出される。ここでネット計数率22をn、測定領域21における計数率データ24から算出された測定計数率をn、バックグラウンド計数率19をnBGとすると、ネット計数率nは式(1)で算出される。 In the dose rate calculation device 11, the net count rate 22 is calculated from the count rate data 24 in the measurement region 21 and the background count rate 19. Here, when the net count rate 22 is n, the measurement count rate calculated from the count rate data 24 in the measurement region 21 is n m , and the background count rate 19 is n BG , the net count rate n is calculated by the equation (1). Is done.

n=nm−BG ・・・(1)
更に、得られたネット計数率nから線量率Dが算出される。線量率換算係数をαとすると、線量率Dは式(2)で算出される。
n = n m- n BG (1)
Further, the dose rate D is calculated from the obtained net count rate n. When the dose rate conversion coefficient is α, the dose rate D is calculated by Equation (2).

D=α×n ・・・(2)
図6に、本発明の放射線計測装置の実施例1における線量率測定結果の時刻推移を示す。
D = α × n (2)
In FIG. 6, the time transition of the dose rate measurement result in Example 1 of the radiation measuring device of this invention is shown.

上記式(2)で導出された線量率データ27は、図6に示す測定時間間隔28で算出される。この時刻推移データは表示モニタ12で表示され、リアルタイムに測定データを観測することが可能である。   The dose rate data 27 derived by the above equation (2) is calculated at the measurement time interval 28 shown in FIG. This time transition data is displayed on the display monitor 12, and the measurement data can be observed in real time.

このような本実施例によれば、OSL素子13を備えることで低線量率環境下であっても、照射時間を調整することで高感度に線量率を計測することができる。また、光ファイバ2を備えることで、各施設における線量率測定箇所が線量率監視エリアから遠方であっても、OSL素子13から蛍光14を効率良く伝送することができる。また、光弁別器3及びバンドパスフィルタ6を備えることで、OSL素子13の蛍光波長と刺激光の波長を効率良く弁別できるため、蛍光14を高感度に計測することができる。また、光源4を備えることで、放射線照射中のOSL素子13に連続して刺激光を照射することができ、本実施例における放射線計測方法が実現できる。また、光検出器7を備えることで、光弁別器3及びバンドパスフィルタ6を透過した光を高感度に検出できる。また、計数率計8を備えることで、光検出器7の出力パルスを計数でき、更に、計数率の時刻推移データを収集できる。また、波形解析装置9を備えることで、放射線照射中、かつ、刺激光照射中に計数率計8で得られた計数率の時刻推移データの出力平坦部を判定できる。また、線量率演算装置11を備えることで、出力平坦部の測定計数率から線量率を算出できる。更に、放射線照射中のOSL素子13に刺激光を連続して照射し、刺激光照射中の計数率の時刻推移データにおける出力平坦部の測定計数率と、予め設定した線量率換算係数とを用いることで、測定線量率を算出できる。また、表示モニタ12に、線量率の時刻推移を表示できる。   According to such a present Example, even if it is under a low dose rate environment by providing the OSL element 13, a dose rate can be measured with high sensitivity by adjusting the irradiation time. In addition, by providing the optical fiber 2, the fluorescence 14 can be efficiently transmitted from the OSL element 13 even when the dose rate measurement location in each facility is far from the dose rate monitoring area. Further, since the light discriminator 3 and the band pass filter 6 are provided, the fluorescence wavelength of the OSL element 13 and the wavelength of the stimulation light can be efficiently distinguished, so that the fluorescence 14 can be measured with high sensitivity. Further, by providing the light source 4, it is possible to continuously irradiate the stimulation light to the OSL element 13 that is being irradiated with radiation, and the radiation measurement method in the present embodiment can be realized. Moreover, by providing the photodetector 7, the light transmitted through the optical discriminator 3 and the band pass filter 6 can be detected with high sensitivity. Further, by providing the count rate meter 8, it is possible to count the output pulses of the photodetector 7, and further it is possible to collect time transition data of the count rate. Further, by providing the waveform analysis device 9, it is possible to determine the output flat portion of the time transition data of the count rate obtained by the count rate meter 8 during radiation irradiation and during stimulation light irradiation. Further, by providing the dose rate calculation device 11, the dose rate can be calculated from the measurement count rate of the output flat portion. Furthermore, the OSL element 13 during radiation irradiation is continuously irradiated with stimulation light, and the measurement count rate of the output flat part in the time transition data of the count rate during stimulation light irradiation and a preset dose rate conversion factor are used. Thus, the measured dose rate can be calculated. Moreover, the time transition of the dose rate can be displayed on the display monitor 12.

これらの構成を有機的に組み合わせることによって、検出器への電源供給が不要で、かつ、簡素な検出器構成で、広ダイナミックレンジに対応できる線量率モニタが実現できる。   By organically combining these configurations, it is possible to realize a dose rate monitor that does not require power supply to the detector and can support a wide dynamic range with a simple detector configuration.

これらの効果から、原子力発電プラントや核燃料再処理施設、放射性同位元素を使用する医療施設、産業施設、研究用加速器施設、一般環境モニタリング装置等に本発明の放射線計測装置及びその計測方法が適用できる。   From these effects, the radiation measuring apparatus and measuring method of the present invention can be applied to nuclear power plants, nuclear fuel reprocessing facilities, medical facilities using radioisotopes, industrial facilities, research accelerator facilities, general environmental monitoring devices, etc. .

また、刺激光照射前の計数率をバックグラウンドとして取り扱い、測定計数率から差し引き、ネット計数率を導出することで、測定計数率のノイズ成分を除去できるため、高感度で、かつ、高精度の線量率測定が実現できる。   In addition, since the count rate before stimulating light irradiation is handled as a background and subtracted from the measurement count rate to derive the net count rate, the noise component of the measurement count rate can be removed. Dose rate measurement can be realized.

また、光検出器7の出力パルスの各々のパルスの検出時刻、パルス波高値を測定する計数率計8を備えることで、OSL素子13の蛍光14の検知タイミングを高精度に検出でき、高精度の計数率測定が実現できる。更に、パルス波高値を測定することで、低い波高値の出力パルスをノイズ成分として取り扱うことができるため、高精度の計数率測定が実現できる。   In addition, by providing the counting rate meter 8 that measures the detection time of each pulse of the output pulse of the photodetector 7 and the pulse peak value, the detection timing of the fluorescence 14 of the OSL element 13 can be detected with high accuracy. The counting rate can be measured. Further, by measuring the pulse peak value, an output pulse having a low peak value can be handled as a noise component, so that a highly accurate counting rate measurement can be realized.

また、OSL素子13として、BaFBr:Eu、BaFBrI:Eu、Al:C、BaFl:Eu、NaCl:Cu、KCl:Eu、KBr:Eu、RbBr:Tl、SrS:Eu,Sm、CsS:Eu,Sm、CaS:Ce,Sm、MgS:Eu,Sm、MgS:Ce,Sm、MgO:Fe、ZnSiO:Mn、Ba(POO:Eu、25NaO、75B:Eu等のいずれかを用いることで、高感度の線量率測定が実現できる。 As the OSL element 13, BaFBr: Eu, BaFBrI: Eu, Al 2 O 3 : C, BaFl: Eu, NaCl: Cu, KCl: Eu, KBr: Eu, RbBr: Tl, SrS: Eu, Sm, CsS: Eu, Sm, CaS: Ce, Sm, MgS: Eu, Sm, MgS: Ce, Sm, MgO: Fe, Zn 2 SiO 4: Mn, Ba 6 (PO 4) 3 O: Eu, 25Na 2 O, 75B 2 By using any of O 3 : Eu and the like, highly sensitive dose rate measurement can be realized.

また、波形解析装置9における判定方法として、出力平坦部の開始点を、刺激光照射直後に生じる蛍光14による計数率ピークのピーク値から95%以上低下した測定点以降とすることで、計数値の変動による計測誤差の増加を低減することができるため、高精度の線量率測定が実現できる。   In addition, as a determination method in the waveform analyzer 9, the starting point of the output flat portion is set to a measurement point that is 95% or more lower than the peak value of the count rate peak due to the fluorescence 14 that occurs immediately after the stimulation light irradiation. Since an increase in measurement error due to fluctuations can be reduced, highly accurate dose rate measurement can be realized.

また、光検出器7として、光電子増倍管、フォトダイオード、アバランシェフォトダイオード等のいずれかを用いることで、OSL素子13の蛍光14を高感度に検出でき、高感度の線量率測定が実現できる。更に、これらの光検出器7でフォトンカウンティングすれば、超高感度の線量率計測が実現できる。   Further, by using any one of a photomultiplier tube, a photodiode, an avalanche photodiode, or the like as the photodetector 7, the fluorescence 14 of the OSL element 13 can be detected with high sensitivity, and a highly sensitive dose rate measurement can be realized. . Furthermore, if photon counting is performed with these photodetectors 7, ultra-sensitive dose rate measurement can be realized.

また、特に図示しないが光検出器7の前段に光分光器を備え、光検出器7において検出する光の波長スペクトルを光分光器で計測することで、OSL素子13の蛍光14や刺激光、バックグラウンドとなる光を波長成分で分析することができ、OSL素子13の蛍光14の波長領域で選択的に計数することができるため、高精度の線量率計測が実現できる。   Further, although not shown in particular, an optical spectrometer is provided in front of the photodetector 7, and the wavelength spectrum of the light detected by the photodetector 7 is measured by the optical spectrometer, so that the fluorescence 14 of the OSL element 13 and the stimulation light, The background light can be analyzed by the wavelength component and can be selectively counted in the wavelength region of the fluorescence 14 of the OSL element 13, so that highly accurate dose rate measurement can be realized.

従って、本実施例で説明した装置を用いることで、放射線検出器への電源供給が不要且つ簡素な検出器構成で、広ダイナミックレンジに対応でき、かつ、高感度、高精度の線量率モニタが実現できる。   Therefore, by using the apparatus described in this embodiment, it is possible to provide a high sensitivity and high accuracy dose rate monitor that can support a wide dynamic range with a simple detector configuration that does not require power supply to the radiation detector. realizable.

本発明の実施例2の放射線計測装置について、図7、図8及び図9を用いて説明する。   A radiation measuring apparatus according to a second embodiment of the present invention will be described with reference to FIGS.

実施例2は、刺激光を照射しながら線量率を算出するものであり、図7に、本発明の放射線計測装置の実施例2における線量率演算フローを示す。   Example 2 calculates a dose rate while irradiating stimulation light, and FIG. 7 shows a dose rate calculation flow in Example 2 of the radiation measurement apparatus of the present invention.

図7において、放射線照射開始(S1)から計数率時刻推移データの収集(S3)までは、実施例1で説明した図3と同様である。実施例2では、刺激光照射を終了せずに、計数率ピークの演算(S5)から線量率の算出(S9)までのフローを実施する。ここまでにおける各項目における実施内容は実施例1と同様である。その後、繰返し測定を実施するが、刺激光は照射し続けているため、直ちに計数率時刻推移データの収集(S3´)を開始する。その後、計数率の算出領域の決定(S7)から線量率の算出(S9)までを実施する。   In FIG. 7, the process from the start of radiation irradiation (S1) to the collection of count rate time transition data (S3) is the same as in FIG. 3 described in the first embodiment. In Example 2, the flow from the calculation of the count rate peak (S5) to the calculation of the dose rate (S9) is performed without ending the stimulation light irradiation. The contents of implementation in each item so far are the same as those in the first embodiment. Thereafter, repeated measurement is performed, but since the stimulation light continues to be radiated, collection of count rate time transition data (S3 ′) is started immediately. Thereafter, the process from the determination of the counting rate calculation region (S7) to the calculation of the dose rate (S9) is performed.

図8に、実施例2における計数率の時刻推移を示す。   In FIG. 8, the time transition of the count rate in Example 2 is shown.

該図に示す如く、刺激光照射開始タイミング20から刺激光の照射を開始し、計数率データ29を測定する。ここで得られた計数率データ29と線量率換算係数を用いることで、線量率を算出する。   As shown in the figure, the stimulation light irradiation is started from the stimulation light irradiation start timing 20, and the count rate data 29 is measured. The dose rate is calculated by using the count rate data 29 and the dose rate conversion coefficient obtained here.

図9に、本発明の放射線計測装置の実施例2における線量率測定結果の時刻推移を示す。   In FIG. 9, the time transition of the dose rate measurement result in Example 2 of the radiation measuring device of this invention is shown.

該図に示す線量率データ30は、計数率データ29に従い算出される。ここで刺激光が常に照射されているため、計数率データ29と線量率データ30の応答はほぼ同期して変動する。このため、線量率データ30は、OSL素子13に照射された放射線による線量率をリアルタイムに測定することとなる。   The dose rate data 30 shown in the figure is calculated according to the count rate data 29. Here, since the stimulation light is always irradiated, the response of the count rate data 29 and the dose rate data 30 fluctuates almost synchronously. For this reason, the dose rate data 30 measures the dose rate by the radiation irradiated to the OSL element 13 in real time.

以上の本実施例で説明した装置を用いることで、実施例1と同様な効果が得られることは勿論、リアルタイム性に優れた線量率モニタが実現できる効果がある。   By using the apparatus described in this embodiment, the same effects as those of the first embodiment can be obtained, and there is an effect that a dose rate monitor excellent in real-time property can be realized.

本発明の実施例3の放射線計測装置について、図10及び図11を用いて説明する。   A radiation measuring apparatus according to Embodiment 3 of the present invention will be described with reference to FIGS. 10 and 11.

実施例3は、実施例1における波形解析装置9の前段にディスクリミネータまたは微分型ディスクリミネータを備えることで、出力平坦部開始タイミング26を判定するものである。   In the third embodiment, the output flat portion start timing 26 is determined by providing a discriminator or a differential discriminator in the previous stage of the waveform analysis device 9 in the first embodiment.

図10に、実施例3における放射線計測装置の構成を示す。図10では、実施例1の図1で示した放射線計測装置の構成に対して、計数率計8と波形解析装置9の間に微分型ディスクリミネータ32を加えたものである。他の構成は、実施例1と同様である。   FIG. 10 shows the configuration of the radiation measuring apparatus according to the third embodiment. In FIG. 10, a differential discriminator 32 is added between the counting rate meter 8 and the waveform analyzer 9 with respect to the configuration of the radiation measuring apparatus shown in FIG. 1 of the first embodiment. Other configurations are the same as those of the first embodiment.

図11に、本発明の放射線計測装置の実施例3における微分波形を用いた出力平坦部の判定方法を示す。   In FIG. 11, the determination method of the output flat part using the differential waveform in Example 3 of the radiation measuring device of this invention is shown.

該図に示す計数率データ24は、刺激光照射開始タイミング20で刺激光を照射されることで得られたデータである。この計数率データ24に対して、微分処理が行われる。計数率データ24がパルス状であるため、刺激光照射開始タイミング20以降の微分波形33の微分計数率は、プラス側に変動する。計数率のピーク点に差し掛かる位置で微分波形33の微分計数率はゼロ点34を通過し、プラス側からマイナス側に変動する。その後、計数率の変動は小さくなるため、微分波形33の微分計数率はゼロ近傍に推移する。ゼロ点34を通過し、かつ、微分計数率がゼロ近傍に収束する微分波形33において、微分波形用しきい値35との交点を出力平坦部開始タイミング31とする。この出力平坦部開始タイミング31に基づいて、実施例1等で実施される線量率の算出を実施する。   The count rate data 24 shown in the figure is data obtained by irradiation with stimulation light at the stimulation light irradiation start timing 20. A differentiation process is performed on the count rate data 24. Since the count rate data 24 has a pulse shape, the differential count rate of the differential waveform 33 after the stimulus light irradiation start timing 20 varies to the plus side. At the position approaching the peak point of the count rate, the differential count rate of the differential waveform 33 passes through the zero point 34 and fluctuates from the plus side to the minus side. Thereafter, since the variation in the count rate becomes small, the differential count rate of the differential waveform 33 shifts to near zero. In the differential waveform 33 that passes through the zero point 34 and the differential count rate converges in the vicinity of zero, the intersection with the differential waveform threshold 35 is set as the output flat portion start timing 31. Based on the output flat portion start timing 31, the dose rate calculated in the first embodiment is calculated.

以上の本実施例で説明した装置を用いることで、実施例1とどうような効果が得られることは勿論、計数値の変動による計測誤差の増加を低減することができるため、高精度の線量率モニタが実現できる。   By using the apparatus described in the above-described embodiment, it is possible to reduce the increase in measurement error due to fluctuations in the count value, as well as to obtain the same effects as in Embodiment 1. A rate monitor can be realized.

特に、波形解析装置9における判定方法として、刺激光照射直後において、時刻推移データの微分値がゼロ点を交差した後に、予め設定したしきい値と交差した点を出力平坦部の開始点とすることで、計数値の変動による計測誤差の増加を低減することができるため、高精度の線量率測定が実現できる。 In particular, as a determination method in the waveform analysis device 9, immediately after stimulation light irradiation, the point where the differential value of the time transition data crosses the zero point and then crosses a preset threshold value is set as the start point of the output flat portion. As a result, an increase in measurement error due to variations in the count value can be reduced, so that highly accurate dose rate measurement can be realized.

本発明の実施例4の放射線計測装置について、図12、図13及び図14を用いて説明する。   A radiation measuring apparatus according to a fourth embodiment of the present invention will be described with reference to FIGS.

実施例4は、実施例1における波形解析装置9と並列に計数値ピーク解析装置37を備え、これらの後段に線量率解析装置38を備えることで、線量率を算出するものである。   In the fourth embodiment, a count value peak analyzing device 37 is provided in parallel with the waveform analyzing device 9 in the first embodiment, and a dose rate analyzing device 38 is provided in the subsequent stage to calculate a dose rate.

図12に、本発明の放射線計測装置の実施例4を示す。   FIG. 12 shows a fourth embodiment of the radiation measuring apparatus of the present invention.

該図に示す計数値ピーク解析装置37は、計数率計8と線量率演算装置38の間に備えられ、波形解析装置9と並列に備えられる。ここで計数値ピーク解析装置37は、計数値ピークにおける計数値を算出するもので、線量率演算装置38は、波形解析装置9と計数値ピーク解析装置37で得られた計数率から線量率を算出するものである。   The count value peak analysis device 37 shown in the figure is provided between the count rate meter 8 and the dose rate calculation device 38 and is provided in parallel with the waveform analysis device 9. Here, the count value peak analysis device 37 calculates the count value at the count value peak, and the dose rate calculation device 38 calculates the dose rate from the count rates obtained by the waveform analysis device 9 and the count value peak analysis device 37. Is to be calculated.

図13に、本発明の放射線計測装置の実施例4における刺激光照射開始時の計数率の時刻推移を示す。   In FIG. 13, the time transition of the count rate at the time of the stimulus light irradiation start in Example 4 of the radiation measuring device of the present invention is shown.

波形解析装置9では実施例1で示したように、測定領域21における計数率データ24とバックグラウンド計数率19からネット計数率22を算出する。計数値ピーク解析装置37では、刺激光照射開始タイミング20から照射された刺激光によって生じた計数率ピーク部分の計数率データ24とバックグラウンド計数率19から計数値ピーク面積39を算出する。これらの計数率から線量率演算装置38を用いて線量率を算出する。   As shown in the first embodiment, the waveform analyzer 9 calculates the net count rate 22 from the count rate data 24 in the measurement region 21 and the background count rate 19. In the count value peak analysis device 37, the count value peak area 39 is calculated from the count rate data 24 of the count rate peak portion generated by the stimulus light irradiated from the stimulus light irradiation start timing 20 and the background count rate 19. The dose rate is calculated from these count rates using the dose rate calculation device 38.

図14に、本発明の放射線計測装置の実施例4における各方式で得られた測定線量率の線形性データを示す。図14では、横軸をOSL素子13を設置した環境における照射線量率、縦軸を本実施例で得られた測定線量率とする。   In FIG. 14, the linearity data of the measured dose rate obtained by each system in Example 4 of the radiation measuring apparatus of this invention are shown. In FIG. 14, the horizontal axis represents the irradiation dose rate in the environment where the OSL element 13 is installed, and the vertical axis represents the measured dose rate obtained in this example.

該図に示す如く、測定線量率は、波形解析装置9で得られた出力平坦部から導出した測定線量率40と、計数値ピークから導出した測定線量率41から構成される。計数値ピークから導出した測定線量率41は、OSL素子13に蓄積されたエネルギーを瞬間的に解放してピークを形成するために、出力平坦部から導出した測定線量率40に対して感度が高いと言える。   As shown in the figure, the measured dose rate is composed of a measured dose rate 40 derived from the output flat portion obtained by the waveform analyzer 9 and a measured dose rate 41 derived from the count value peak. The measured dose rate 41 derived from the count value peak is more sensitive to the measured dose rate 40 derived from the output flat portion in order to instantaneously release the energy accumulated in the OSL element 13 to form a peak. It can be said.

ここで、低線量率領域における線量率測定を計数値ピークから導出した測定線量率41、高線量率領域における線量率測定を出力平坦部から導出した測定線量率40とし、中間の重複領域42で出力平坦部から導出した測定線量率40及び計数値ピークから導出した測定線量率41の線量率測定手段を適用するとき、広いダイナミックレンジで高精度の線量率測定が実現できる。   Here, the dose rate measurement in the low dose rate region is defined as a measured dose rate 41 derived from the peak of the count value, and the dose rate measurement in the high dose rate region is defined as the measured dose rate 40 derived from the output flat portion. When applying the dose rate measuring means of the measured dose rate 40 derived from the output flat part and the measured dose rate 41 derived from the count value peak, it is possible to realize highly accurate dose rate measurement with a wide dynamic range.

以上の本実施例で説明した装置を用いることで、実施例1と同様な効果が得られることは勿論、広いダイナミックレンジを高精度に測定可能な線量率モニタが実現できる。   By using the apparatus described in this embodiment, the same effect as that of Embodiment 1 can be obtained, and a dose rate monitor capable of measuring a wide dynamic range with high accuracy can be realized.

また、激光照射直後に生じる蛍光14による計数率ピークの測定計数値から線量率を算出する線量率解析装置38を備えることで、OSL素子13への照射線量と相関がある測定計数値と放射線照射時間から線量率を導出することができる。更に、低線量率領域の線量率測定を測定計数値、高線量率領域での線量率測定を測定計数率とし、中間の線量率領域で上記2方式の線量率測定手段を適用することで、広いダイナミックレンジで線量率を測定できる。   Further, by providing a dose rate analysis device 38 that calculates the dose rate from the measurement count value of the count rate peak due to the fluorescence 14 generated immediately after the intense light irradiation, the measurement count value correlated with the irradiation dose to the OSL element 13 and the radiation irradiation The dose rate can be derived from the time. Furthermore, the dose rate measurement in the low dose rate region is the measurement count value, the dose rate measurement in the high dose rate region is the measurement count rate, and by applying the above two methods of dose rate measurement means in the intermediate dose rate region, The dose rate can be measured with a wide dynamic range.

なお、本発明は上記した実施例に限定されるものではなく、様々な変形例が含まれる。上記した実施例は本発明を分かりやすく説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施例の構成の一部を他の実施例の構成に置き換えることも可能であり、ある実施例の構成に他の実施例の構成を加えることも可能である。また、各実施例の構成の一部について、他の構成の追加・削除・置換をすることも可能である。   In addition, this invention is not limited to an above-described Example, Various modifications are included. The above-described embodiments are illustrative of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment. Moreover, it is also possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

1…放射線検出部、2…光ファイバ、3…光弁別器、4…光源、5…光源用制御装置、6…バンドパスフィルタ、7…光検出器、8…計数率計、9…波形解析装置、10…制御信号ケーブル、11、38…線量率演算装置、12…表示モニタ、13…OSL素子、14…蛍光、15…波高弁別レベル、16…パルス出力、17…検出タイミング、18…波高値、19…バックグラウンド計数率、20…刺激光照射開始タイミング、21…測定領域、22…ネット計数率、23…計数率ピーク、24、25、29…計数率データ、26、31…出力平坦部開始タイミング、27、30…線量率データ、28…測定時間間隔、32…微分型ディスクリミネータ、33…微分波形、34…ゼロ点、35…微分波形用しきい値、37…計数値ピーク解析装置、39…計数値ピーク面積、40…出力平坦部から導出した測定線量率、41…計数値ピークから導出した測定線量率、42…重複領域、43…刺激光照射終了タイミング。   DESCRIPTION OF SYMBOLS 1 ... Radiation detection part, 2 ... Optical fiber, 3 ... Optical discriminator, 4 ... Light source, 5 ... Control device for light sources, 6 ... Band pass filter, 7 ... Photo detector, 8 ... Count rate meter, 9 ... Waveform analysis Devices 10, control signal cable 11, 38 dose rate calculation device 12 display monitor 13 OSL element 14 fluorescence 15 pulse height discrimination level 16 pulse output 17 detection timing 18 wave High value, 19 ... background count rate, 20 ... stimulation light irradiation start timing, 21 ... measurement region, 22 ... net count rate, 23 ... count rate peak, 24, 25, 29 ... count rate data, 26, 31 ... flat output Start timing, 27, 30 ... dose rate data, 28 ... measurement time interval, 32 ... differential discriminator, 33 ... differential waveform, 34 ... zero point, 35 ... threshold for differential waveform, 37 ... peak of count value Solution Device, 39 ... counts peak area, 40 ... measuring dose rate derived from the output flats, 41 ... measuring dose rate derived from the count value peak, 42 ... overlap region, 43 ... stimulus light irradiation end timing.

Claims (16)

放射線を検出する光輝尽蛍光素子と、該光輝尽蛍光素子から発せられる蛍光及び該光輝尽蛍光素子の刺激光を伝送する光ファイバと、前記蛍光と前記光輝尽蛍光素子の刺激光を弁別する光弁別器と、前記光輝尽蛍光素子の刺激光を連続して前記光輝尽蛍光素子に照射可能な光源と、前記光輝尽蛍光素子の刺激光の波長を減衰させ前記光輝尽蛍光素子の蛍光波長を透過するバンドパスフィルタと、該バンドパスフィルタを透過した光を電気信号に変換し、その電気信号をパルス形状或いは電流値として出力する光検出器と、該光検出器のパルス出力を計数し、計数率の時刻推移データを導出する計数率計と、該計数率計で導出した前記計数率の時刻推移データの出力平坦部を判定する波形解析装置と、該波形解析装置で判定した前記計数率の時刻推移データの出力平坦部の測定計数率から線量率を算出する線量率演算装置とを備え、
放射線照射中の前記光輝尽蛍光素子に前記光源から前記刺激光を連続して照射し、前記刺激光照射中で、かつ、前記波形解析装置で判定した前記計数率の時刻推移データの前記出力平坦部の前記測定計数率と、予め設定した線量率換算係数と基づいて前記線量率を前記線量率演算装置で算出することを特徴とする放射線計測装置。
Photoluminescent fluorescent element for detecting radiation, optical fiber for transmitting fluorescence emitted from the fluorescent fluorescent element and stimulation light of the fluorescent fluorescent element, and light for discriminating between the fluorescent light and the stimulating light of the fluorescent fluorescent element A discriminator; a light source capable of continuously irradiating the photostimulable fluorescent element with the stimulating light of the photostimulable fluorescent element; and attenuating the wavelength of the stimulating light of the photostimulated fluorescent element to reduce the fluorescence wavelength of the photostimulated fluorescent element. A band-pass filter that transmits, a light detector that converts the light transmitted through the band-pass filter into an electrical signal, outputs the electrical signal as a pulse shape or current value, and counts the pulse output of the photodetector; A count rate meter for deriving time transition data of the count rate, a waveform analyzer for determining an output flat portion of the time rate transition data of the count rate derived by the count rate meter, and the count rate determined by the waveform analyzer time And a dose rate calculation unit for calculating the dose rate from the measured counting rate of the output flat portion of the transition data,
The output flatness of the time transition data of the counting rate determined by the waveform analyzer during irradiation of the stimulating light and continuously irradiating the stimulating fluorescent element during irradiation with the stimulation light from the light source. It said measuring count rate parts, a radiation measuring device, and calculates at the dose rate calculation device the dose rate on the basis of the dose rate conversion factor set in advance.
請求項1に記載の放射線計測装置において、
前記計数率計は、前記光検出器の出力パルスの各々のパルスの検出時刻、パルス波高値を測定することで前記光検出器のパルス出力を計数することを特徴とする放射線計測装置。
The radiation measurement apparatus according to claim 1,
The radiation measuring apparatus, wherein the counting rate meter counts the pulse output of the photodetector by measuring a detection time and a pulse peak value of each of the output pulses of the photodetector.
請求項1又は2に記載の放射線計測装置において、
前記線量率演算装置は光源用制御装置と接続され、前記光源における前記刺激光の照射開始及び終了タイミングの情報を前記線量率演算装置が認識していることを特徴とする放射線計測装置。
In the radiation measuring device according to claim 1 or 2,
The radiation rate measurement device is connected to a light source control device, and the dose rate calculation device recognizes information on the start and end timings of the stimulation light irradiation in the light source.
請求項1乃至3のいずれか1項に記載の放射線計測装置において、
前記計数率の時刻推移データの出力平坦部の測定計数率から前記刺激光照射前の計数率を差し引いた計数率をネット計数率とし、該ネット計数率から測定線量率を算出することを特徴とする放射線計測装置。
The radiation measurement apparatus according to any one of claims 1 to 3,
The count rate obtained by subtracting the count rate before the stimulation light irradiation from the measurement count rate of the output flat portion of the time transition data of the count rate is set as a net count rate, and the measured dose rate is calculated from the net count rate A radiation measurement device.
請求項1乃至4のいずれか1項に記載の放射線計測装置において、
前記波形解析装置における前記計数率の時刻推移データの出力平坦部の判定は、前記計数率の時刻推移データの出力平坦部の開始点を、前記刺激光照射の直後に生じる前記蛍光による計数率ピークのピーク値から95%以上低下した測定点以降とすることを特徴とする放射線計測装置。
In the radiation measuring device according to any one of claims 1 to 4,
The determination of the output flat portion of the time transition data of the count rate in the waveform analyzer is performed by using the count rate peak due to the fluorescence generated immediately after the stimulation light irradiation as the start point of the output flat portion of the time transition data of the count rate. The radiation measuring apparatus is characterized by being after the measuring point which is reduced by 95% or more from the peak value.
請求項1に記載の放射線計測装置において、
前記波形解析装置における前記計数率の時刻推移データの出力平坦部の判定は、前記刺激光照射の直後において、前記波形解析装置の前段に設置された微分型ディスクリミネータによる前記時刻推移データの微分値がゼロ点を交差した後に、予め設定した閾値と交差した点を前記計数率の時刻推移データの出力平坦部の開始点とすることを特徴とする放射線計測装置。
The radiation measurement apparatus according to claim 1,
The determination of the output flat part of the time transition data of the counting rate in the waveform analyzer is performed immediately after the stimulation light irradiation by differentiating the time transition data by a differential discriminator installed in the previous stage of the waveform analyzer. A radiation measuring apparatus characterized in that, after a value crosses a zero point, a point where a predetermined threshold is crossed is set as a start point of an output flat portion of the time transition data of the counting rate.
請求項1に記載の放射線計測装置において、
前記波形解析装置と並列に計数値ピークにおける計数値を算出する計数値ピーク解析装置を備えると共に、該計数値ピーク解析装置の後段に、該計数値ピーク解析装置で算出された前記刺激光照射の直後に生じる前記蛍光による計数率ピークの測定計数値から線量率を算出する線量率解析装置を備えていることを特徴とする放射線計測装置。
The radiation measurement apparatus according to claim 1,
In addition to the waveform analysis apparatus, the waveform analysis apparatus includes a count value peak analysis apparatus that calculates a count value at the count value peak, and the stimulation light irradiation calculated by the count value peak analysis apparatus is provided downstream of the count value peak analysis apparatus. A radiation measurement apparatus comprising: a dose rate analysis device that calculates a dose rate from a measurement count value of a count rate peak due to the fluorescence that occurs immediately after the fluorescence.
請求項1に記載の放射線計測装置において、
前記光検出器の前段に光分光器を備え、前記光検出器において検出する光の波長スペクトルを計測することを特徴とする放射線計測装置。
The radiation measurement apparatus according to claim 1,
A radiation measuring apparatus comprising an optical spectrometer in front of the photodetector and measuring a wavelength spectrum of light detected by the photodetector.
請求項1乃至のいずれか1項に記載の放射線計測装置において、
前記光検出器として光電子増倍管、フォトダイオード、アバランシェフォトダイオードのいずれかを用いることを特徴とする放射線計測装置。
The radiation measurement apparatus according to any one of claims 1 to 8 ,
Any one of a photomultiplier tube, a photodiode, and an avalanche photodiode is used as the photodetector.
放射線を検出する光輝尽蛍光素子と、該光輝尽蛍光素子から発せられる蛍光及び該光輝尽蛍光素子の刺激光を伝送する光ファイバと、前記蛍光と前記光輝尽蛍光素子の刺激光を弁別する光弁別器と、前記光輝尽蛍光素子の刺激光を連続して前記光輝尽蛍光素子に照射可能な光源と、前記光輝尽蛍光素子の刺激光の波長を減衰させ前記光輝尽蛍光素子の蛍光波長を透過するバンドパスフィルタと、該バンドパスフィルタを透過した光を電気信号に変換し、その電気信号をパルス形状或いは電流値として出力する光検出器と、該光検出器のパルス出力を計数し、計数率の時刻推移データを導出する計数率計と、該計数率計で導出した前記計数率の時刻推移データの出力平坦部を判定する波形解析装置と、該波形解析装置で判定した前記計数率の時刻推移データの出力平坦部の測定計数率から線量率を算出する線量率演算装置とを備えた放射線計測装置で放射線を計測する際に、
放射線照射中の前記光輝尽蛍光素子に前記光源から前記刺激光を連続して照射すると共に、前記刺激光照射中で、かつ、前記波形解析装置で判定した前記計数率の時刻推移データの前記出力平坦部の前記測定計数率と、予め設定した線量率換算係数とに基づいて前記線量率演算装置で前記線量率を算出することを特徴とする放射線計測方法。
Photoluminescent fluorescent element for detecting radiation, optical fiber for transmitting fluorescence emitted from the fluorescent fluorescent element and stimulation light of the fluorescent fluorescent element, and light for discriminating between the fluorescent light and the stimulating light of the fluorescent fluorescent element A discriminator; a light source capable of continuously irradiating the photostimulable fluorescent element with the stimulating light of the photostimulable fluorescent element; and attenuating the wavelength of the stimulating light of the photostimulated fluorescent element to reduce the fluorescence wavelength of the photostimulated fluorescent element. A band-pass filter that transmits, a light detector that converts the light transmitted through the band-pass filter into an electrical signal, outputs the electrical signal as a pulse shape or current value, and counts the pulse output of the photodetector; A count rate meter for deriving time transition data of the count rate, a waveform analyzer for determining an output flat portion of the time rate transition data of the count rate derived by the count rate meter, and the count rate determined by the waveform analyzer time When measuring the radiation in a radiation measuring device including a dose rate calculation unit for calculating the dose rate from the measured counting rate of the output flat portion of the transition data,
The output of the time transition data of the counting rate during irradiation of the stimulating light and determined by the waveform analyzer while continuously irradiating the stimulating fluorescent element during irradiation with the stimulation light from the light source A radiation measurement method, wherein the dose rate is calculated by the dose rate calculation device based on the measurement count rate of a flat portion and a preset dose rate conversion coefficient.
請求項10に記載の放射線計測方法において、
前記光検出器の出力パルスの各々のパルスの検出時刻、パルス波高値を測定することで前記光検出器のパルス出力を前記計数率計で計数することを特徴とする放射線計測方法。
The radiation measurement method according to claim 10 ,
A radiation measurement method, wherein the pulse output of the photodetector is counted by the counting rate meter by measuring the detection time and pulse peak value of each pulse of the output pulses of the photodetector.
請求項10又は11に記載の放射線計測方法において、
前記光源における前記刺激光の照射開始及び終了タイミングの情報を、光源用制御装置に接続されている前記線量率演算装置が認識していることを特徴とする放射線計測方法。
The radiation measurement method according to claim 10 or 11 ,
The radiation measurement method characterized in that the dose rate calculation device connected to the light source control device recognizes information on the start and end timing of the stimulation light irradiation in the light source.
請求項10乃至12のいずれか1項に記載の放射線計測方法において、
前記計数率の時刻推移データの出力平坦部の測定計数率から前記刺激光照射前の計数率を差し引いた計数率をネット計数率とし、該ネット計数率から測定線量率を算出することを特徴とする放射線計測方法。
The radiation measurement method according to any one of claims 10 to 12 ,
The count rate obtained by subtracting the count rate before the stimulation light irradiation from the measurement count rate of the output flat portion of the time transition data of the count rate is set as a net count rate, and the measured dose rate is calculated from the net count rate Radiation measurement method.
請求項10乃至13のいずれか1項に記載の放射線計測方法において、
前記波形解析装置における前記計数率の時刻推移データの出力平坦部の判定は、前記計数率の時刻推移データの出力平坦部の開始点を、前記刺激光照射の直後に生じる前記蛍光による計数率ピークのピーク値から95%以上低下した測定点以降とすることを特徴とする放射線計測方法。
The radiation measurement method according to any one of claims 10 to 13 ,
The determination of the output flat portion of the time transition data of the count rate in the waveform analyzer is performed by using the count rate peak due to the fluorescence generated immediately after the stimulation light irradiation as the start point of the output flat portion of the time transition data of the count rate. A radiation measuring method, characterized in that the measurement point is after a measurement point that is 95% or more lower than the peak value.
請求項10に記載の放射線計測方法において、
前記波形解析装置における前記計数率の時刻推移データの出力平坦部の判定は、前記刺激光照射の直後において、前記波形解析装置の前段に設置された微分型ディスクリミネータによる前記時刻推移データの微分値がゼロ点を交差した後に、予め設定した閾値と交差した点を前記計数率の時刻推移データの出力平坦部の開始点とすることを特徴とする放射線計測方法。
The radiation measurement method according to claim 10 ,
The determination of the output flat part of the time transition data of the counting rate in the waveform analyzer is performed immediately after the stimulation light irradiation by differentiating the time transition data by a differential discriminator installed in the previous stage of the waveform analyzer. A radiation measurement method characterized in that, after a value crosses a zero point, a point where a predetermined threshold is crossed is set as a start point of an output flat portion of the time transition data of the count rate.
請求項10に記載の放射線計測方法において、
前記波形解析装置と並列に配置されている計数値ピーク解析装置で計数値ピークにおける計数値を算出すると共に、前記計数値ピーク解析装置の後段に配置されている線量率解析装置で、前記計数値ピーク解析装置で算出された前記刺激光照射の直後に生じる前記蛍光による計数率ピークの測定計数値から線量率を算出することを特徴とする放射線計測方法。
The radiation measurement method according to claim 10 ,
The count value at the count value peak is calculated by the count value peak analyzer arranged in parallel with the waveform analyzer, and the count value is calculated at the dose rate analyzer arranged at the subsequent stage of the count value peak analyzer. A radiation measurement method, wherein a dose rate is calculated from a measurement count value of a count rate peak due to the fluorescence generated immediately after the stimulation light irradiation calculated by a peak analyzer.
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