JPH077061B2 - Dosimeter compound cable - Google Patents
Dosimeter compound cableInfo
- Publication number
- JPH077061B2 JPH077061B2 JP62203275A JP20327587A JPH077061B2 JP H077061 B2 JPH077061 B2 JP H077061B2 JP 62203275 A JP62203275 A JP 62203275A JP 20327587 A JP20327587 A JP 20327587A JP H077061 B2 JPH077061 B2 JP H077061B2
- Authority
- JP
- Japan
- Prior art keywords
- dosimeter
- cable
- radiation
- dose
- esr
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 150000001875 compounds Chemical class 0.000 title 1
- 239000002131 composite material Substances 0.000 claims description 13
- 235000001014 amino acid Nutrition 0.000 claims description 8
- 150000001413 amino acids Chemical class 0.000 claims description 8
- QNAYBMKLOCPYGJ-REOHCLBHSA-N L-alanine Chemical compound C[C@H](N)C(O)=O QNAYBMKLOCPYGJ-REOHCLBHSA-N 0.000 claims description 3
- 235000004279 alanine Nutrition 0.000 claims description 3
- 239000011230 binding agent Substances 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 230000005855 radiation Effects 0.000 description 14
- 238000004435 EPR spectroscopy Methods 0.000 description 4
- 231100000987 absorbed dose Toxicity 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 150000003254 radicals Chemical class 0.000 description 3
- HNURKXXMYARGAY-UHFFFAOYSA-N 2,6-Di-tert-butyl-4-hydroxymethylphenol Chemical compound CC(C)(C)C1=CC(CO)=CC(C(C)(C)C)=C1O HNURKXXMYARGAY-UHFFFAOYSA-N 0.000 description 2
- 239000005321 cobalt glass Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001362 electron spin resonance spectrum Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005562 fading Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Measurement Of Radiation (AREA)
Description
【発明の詳細な説明】 この発明は、放射線環境下において使用される電線・ケ
ーブル（光ケーブルを含む）に関する。The present invention relates to electric wires and cables (including optical cables) used in a radiation environment.
［従来の技術］ 放射線環境下、例えば原子力発電所等に布設される電線
・ケーブルは、種々の条件の放射線に暴露される。ま
た、一般的に布設ルートが長くて複雑であるので、一度
電線・ケーブルが布設されると全長に渡り取り替えるこ
とはなかなか困難である。当然ながら、電線・ケーブル
は一部分でも著しく放射線劣化が起こればその機能が失
われ、重大な災害を招く可能性もある。[Prior Art] Under a radiation environment, for example, electric wires and cables laid in a nuclear power plant are exposed to radiation under various conditions. In addition, since the installation route is generally long and complicated, once the electric wire / cable is installed, it is difficult to replace it over the entire length. As a matter of course, if a part of the electric wire / cable is significantly deteriorated by radiation, the function of the electric wire / cable is lost, which may cause a serious disaster.
したがって、このような環境下における電線・ケーブル
の全長にわたって放射線の被爆量の分布を知ることは関
連業界においては強く要望されている所である。しか
し、従来はこれは不可能なことと考えられていた。Therefore, it is a strong demand in related industries to know the distribution of radiation exposure dose over the entire length of electric wires and cables under such an environment. However, in the past this was considered impossible.
即ち、第一に電線・ケーブルのように長い区間をカバー
することができる適当な線量計がなかったこと、第二
に、放射線は遮蔽物や位置等の違いによって著しくその
効果が異なるため、実際の電線・ケーブルが受ける放射
線量と線量計で測定した放射線量とが必ずしも一致しな
いことが主な理由である。That is, first, there was no suitable dosimeter that could cover a long section such as electric wires and cables, and secondly, the effect of radiation remarkably differs depending on the difference in the shield and the position. The main reason for this is that the radiation dose received by the electric wires and cables of the above does not always match the radiation dose measured by the dosimeter.
前者に対しては、例えば、コバルトガラス線量計、ポリ
メチルメタアクリレート（PMMA）線量計等を電線・ケー
ブルに貼り付ければある程度その目的を達成することは
できる。しかしながら、これらの線量計は長さが５〜10
cm程度のものであり、長区間に渡ってそれを貼り付ける
ことは極めて無理がある。また、例え長尺のコバルトガ
ラス線量計あるいはPMMA線量計を作製したとしても、電
線・ケーブルに見合う可撓性に欠けるため連続的に電線
・ケーブルに沿わせることが困難である。また、後者に
対しては、計算によってある程度補正することができる
ものの、これはあくまでも実際の放射線被爆値ではな
い。さらに、測定時間が数カ月以上の長期にわたる場合
には、これらの線量計はフェーディングが比較的大きい
ため、原理的に正確な放射線量を知ることが極めて困難
となっている。For the former, the purpose can be achieved to some extent by attaching a cobalt glass dosimeter, a polymethylmethacrylate (PMMA) dosimeter, etc. to the wire / cable. However, these dosimeters have a length of 5-10
It is about cm, and it is extremely difficult to paste it over a long section. Moreover, even if a long cobalt glass dosimeter or PMMA dosimeter is manufactured, it is difficult to fit the wires and cables continuously because of lack of flexibility commensurate with the wires and cables. Although the latter can be corrected to some extent by calculation, this is not the actual radiation exposure value. Furthermore, when the measurement time is a long period of several months or longer, fading of these dosimeters is relatively large, which makes it extremely difficult to know the accurate radiation dose in principle.
［発明が解決しようとする問題点］ このように、電線・ケーブルに沿って放射線量の分布を
連続して測定することは極めて困難なものであり、現実
にも測定されていなかった。これは業界の強い要望にも
かかわらず、適切な技術手段が存在しなかったためであ
る。[Problems to be Solved by the Invention] As described above, it is extremely difficult to continuously measure the distribution of the radiation dose along the electric wire / cable, and it has not been actually measured. This is because despite the strong demand of the industry, there was no suitable technical means.
この発明は、このような点に鑑みてなされたもので、簡
単に放射線の被爆量を計測することができる新規な電線
・ケーブルを提供することを目的とする。The present invention has been made in view of the above circumstances, and an object thereof is to provide a novel electric wire / cable capable of easily measuring the radiation exposure amount.
［問題を解決するための手段］ この発明では、ポリマをバインダとして紐状に成形して
なるアミノ酸線量計を縦添えまたは撚合せにより電線・
ケーブルに添設して線量計複合ケーブルとしたものであ
る。[Means for Solving the Problem] In the present invention, an amino acid dosimeter formed by using a polymer as a binder to form a string is vertically attached or twisted to form an electric wire.
This is a dosimeter composite cable attached to the cable.
［作用］ 線量計複合ケーブルの放射線被爆量の分布を計測するに
は、布設後の複合ケーブルから線量計部分のみを切り取
り、電子スピン共鳴装置（ESR）を使用して容易に正確
な値を測定することが可能となる。[Operation] To measure the radiation exposure distribution of the dosimeter composite cable, cut out only the dosimeter part from the installed composite cable and use an electron spin resonance device (ESR) to easily and accurately measure the value. It becomes possible to do.
［実施例］ ポリマをバインダとするアミノ酸線量計は、例えば特開
昭61-97585号公報および特開昭61-57878号公報に示され
ている。この場合のアミノ酸としてはアラニンを用いて
いるが、この発明ではこれに限定されるものではない。[Example] An amino acid dosimeter using a polymer as a binder is disclosed in, for example, JP-A-61-97585 and JP-A-61-57878. Although alanine is used as the amino acid in this case, the present invention is not limited to this.
アミノ酸線量計複合ケーブルの製造は、例えばゴム又は
樹脂にアミノ酸をミキシングロール等で混練し、均一な
組成物として長尺の紐状に押出成形し、次にこの線量計
の紐を縦添えまたは撚合せにより電線・ケーブルに添設
することによって達成することができる。この紐の形状
は、棒状、円柱状、チューブおよびシート等何でもよ
い。Amino acid dosimeter composite cable is manufactured, for example, by kneading amino acid into rubber or resin with a mixing roll or the like, extruding into a long string as a uniform composition, and then vertically or twisting the dosimeter string. It can be achieved by attaching the wires and cables together. The string may have any shape such as a rod shape, a column shape, a tube and a sheet.
ケーブルの放射線被爆量の分布を求める場合は、目的の
区間のケーブルのアミノ酸線量計部分を切り取り、電子
スピン共鳴装置（ESR）を使用して、前記特許公報に示
されたような手段によって放射線の線量分布を知ること
ができる。To obtain the radiation exposure distribution of the cable, cut out the amino acid dosimeter part of the cable in the target section and use an electron spin resonance device (ESR) to measure the radiation dose by means such as that shown in the patent publication. You can know the dose distribution.
ESR測定条件は、変調周波数100kHz、モジュレーション
２ガウス、Power 4mW、室温で行った。ESRによって得ら
れるスペクトルを第５図に示す。この図における曲線の
ピーク高さｈが放射線の吸収により生成したラジカル濃
度に対応する値である。また、線量計部分の素子のESR
ピークの単位重量当たりの高さ（生成ラジカル濃度に比
例）と吸収線量の関係を第６図に示す。吸収線量の対数
値とESRピークの高さの対数値はほぼ直線的な関係を示
すので、線量未知の素子のESRスペクトルピークの高さ
を測定すれば、この直線から放射線の吸収線量を求める
ことができる。The ESR measurement conditions were a modulation frequency of 100 kHz, a modulation of 2 gauss, a power of 4 mW, and room temperature. The spectrum obtained by ESR is shown in FIG. The peak height h of the curve in this figure is a value corresponding to the concentration of radicals generated by absorption of radiation. Also, the ESR of the element of the dosimeter part
Fig. 6 shows the relationship between the peak height per unit weight (proportional to the concentration of produced radicals) and the absorbed dose. Since the logarithmic value of the absorbed dose and the logarithmic value of the height of the ESR peak show an almost linear relationship, if the height of the ESR spectrum peak of an element with unknown dose is measured, the absorbed dose of radiation can be obtained from this straight line. You can
実施例 ポリエチレン［宇部興産（株）製Ｚ−265］100重量部に
アラニン［和光純薬（株）製 特級］を200重量部およ
び４−ヒドロキシメチル−2,6−ジ−第三ブチルフェノ
ール0.1重量部をミキシングロールで温度120℃で混練し
て均一な組成物とした。Example: 100 parts by weight of polyethylene [Z-265 manufactured by Ube Industries, Ltd.] and 200 parts by weight of alanine [special grade manufactured by Wako Pure Chemical Industries, Ltd.] and 0.1 part by weight of 4-hydroxymethyl-2,6-di-tert-butylphenol. The parts were kneaded with a mixing roll at a temperature of 120 ° C. to obtain a uniform composition.
次に、この組成物を紐状に押出成形し、撚合等によりケ
ーブルに一体に添設し、複合ケーブルを作製した。即
ち、第１図に示すものでは、ケーブル２上に線量計１が
縦添えして形成される。第２図に示すものでは、断面形
状が２本のケーブル上に俵積状に線量計１を載置した撚
線に形成される。第３図のものでは、複数のケーブル２
の同心撚合せの中の周囲の１本を線量計１に置き換えて
構成したものである。Next, this composition was extruded into a string shape, and was integrally attached to the cable by twisting or the like to prepare a composite cable. That is, in the structure shown in FIG. 1, the dosimeter 1 is vertically formed on the cable 2. In the structure shown in FIG. 2, the cross-sectional shape is formed into a twisted wire in which the dosimeter 1 is mounted on the two cables in the shape of a bag. In FIG. 3, a plurality of cables 2
In this concentric twist, the surrounding one is replaced with the dosimeter 1.
第１図の線量計複合ケーブル５の15mを60Co−γ線源の
周囲に任意に配置した。６カ月後にこのケーブル５を取
り出し、同ケーブルの被爆線量を測定するため、直径3m
mΦの線量計１部分のみを50cm毎に3cmの長さに切り出
し、長さ方向に沿って合計31本の素子を得た。これらの
素子から電子スピン共鳴装置（ESR）を使用して素子中
のフリーラジカル数の相対値を求めた。電子スピン共鳴
装置（ESR）の測定条件は、変調周波数100kHz、Mod.2
G、Power 4mW、室温測定である。実際の線量は、さらに
線量−フリーラジカル相対量基準直線との比較から求め
た。15 m of the dosimeter composite cable 5 in FIG. 1 was arbitrarily placed around the 60 Co-γ-ray source. After 6 months, take out this cable 5 and measure its exposure dose.
Only one part of the mΦ dosimeter was cut into 50 cm lengths of 3 cm, and 31 elements in total were obtained along the length direction. The relative value of the number of free radicals in the device was obtained from these devices using an electron spin resonance system (ESR). The measurement conditions of the electron spin resonance system (ESR) are as follows: Modulation frequency 100kHz, Mod.2
G, Power 4mW, room temperature measurement. The actual dose was further determined by comparison with a dose-free radical relative amount reference line.
この結果を第４図に示す。即ち、ケーブル長さ方向に沿
った放射線の線量分布が明瞭に分かる。なお、従来にお
いては比較可能な手段が無く、比較例を揚げることはで
きない。The results are shown in FIG. That is, the radiation dose distribution along the cable length direction can be clearly seen. It should be noted that in the past, there is no means for comparison and it is not possible to list comparative examples.
［発明の効果］ 以上説明したように、この発明の線量計複合ケーブルを
使用すれば、放射線環境下の電線・ケーブルの長さ方向
の被爆線量を事前の準備を何ら必要としないで極めて容
易に測定することが可能となる。そして、経済的にも低
コストででき、また、安全対策の観点からも産業上極め
てその効果は大きいものとなる。[Advantages of the Invention] As described above, by using the dosimeter composite cable of the present invention, the exposure dose in the lengthwise direction of the electric wire / cable in a radiation environment can be extremely easily achieved without any prior preparation. It becomes possible to measure. Further, it can be economically performed at low cost, and the effect is industrially extremely large from the viewpoint of safety measures.
第１図ないし第３図は、それぞれこの発明の線量計複合
ケーブルの各実施例を示す断面図、 第４図は、線量計複合ケーブルのケーブル長さ方向の線
量分布の測定結果の一例を示す線図、 第５図は、ESRによって得られるスペクトルの一例を示
す線図、 第６図は、線量計複合ケーブルの線量計部分の素子にお
けるESRスペクトルのピークの単位重量当りの高さと吸
収線量の関係を示す線図である。 １……線量計 ２……電線・ケーブル ３……線量計複合ケーブル1 to 3 are cross-sectional views showing respective embodiments of the dosimeter composite cable of the present invention, and FIG. 4 shows an example of measurement result of dose distribution in the cable length direction of the dosimeter composite cable. Diagram, Fig. 5 is a diagram showing an example of spectrum obtained by ESR, and Fig. 6 is the height per unit weight of the peak of ESR spectrum in the element of the dosimeter part of the dosimeter composite cable and the absorbed dose. It is a diagram showing a relationship. 1 ... Dosimeter 2 ... Electric wire / cable 3 ... Dosimeter composite cable
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高月 英男 茨城県日立市日高町５丁目１番１号 日立 電線エフエム株式会社内 (72)発明者 吉岡 正幸 東京都千代田区丸の内２丁目１番２号 日 立電線株式会社内 (56)参考文献 特開 昭61−97585（ＪＰ，Ａ) 実開 昭60−126916（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hideo Takatsuki 5-1-1 Hidaka-cho, Hitachi-shi, Ibaraki Hitachi Cable FM Co., Ltd. (72) Inventor Masayuki Yoshioka 2-1-1 Marunouchi, Chiyoda-ku, Tokyo No. 2 in Nitrate Electric Cable Co., Ltd. (56) Reference JP-A-61-97585 (JP, A) Actually developed S60-126916 (JP, U)
Claims (2)
るアミノ酸線量計を縦添えまたは撚合せにより電線・ケ
ーブルに添設したことを特徴とする線量計複合ケーブ
ル。1. A dosimeter composite cable, wherein an amino acid dosimeter formed by using a polymer as a binder in a string shape is attached to an electric wire / cable by vertically or twisting.
第１項記載の線量計複合ケーブル。2. The dosimeter composite cable according to claim 1, wherein the amino acid is alanine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62203275A JPH077061B2 (en) | 1987-08-15 | 1987-08-15 | Dosimeter compound cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62203275A JPH077061B2 (en) | 1987-08-15 | 1987-08-15 | Dosimeter compound cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6446676A JPS6446676A (en) | 1989-02-21 |
| JPH077061B2 true JPH077061B2 (en) | 1995-01-30 |
Family
ID=16471351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62203275A Expired - Lifetime JPH077061B2 (en) | 1987-08-15 | 1987-08-15 | Dosimeter compound cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH077061B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6446678A (en) * | 1987-08-17 | 1989-02-21 | Hitachi Cable | Article used in radiation environment |
| DE3806867A1 (en) * | 1988-03-03 | 1989-09-14 | Kabelmetal Electro Gmbh | LONG-SLIPED FORMKOERPER FOR DETECTING THE OWN DOSE ENERGY-EFFICIENT RADIATION |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60126916U (en) * | 1984-02-03 | 1985-08-26 | 三菱重工業株式会社 | Cable with color dosimeter |
| JPS6197585A (en) * | 1984-10-19 | 1986-05-16 | Japan Atom Energy Res Inst | Dosimeter for resin molding |
-
1987
- 1987-08-15 JP JP62203275A patent/JPH077061B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6446676A (en) | 1989-02-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Nakamura | Drift velocity and longitudinal diffusion coefficient of electrons in nitrogen and carbon monoxide | |
| DE19649011C2 (en) | Grid sensor for determining the conductivity distribution in flowing media and method for obtaining the measurement signals | |
| DE3776424D1 (en) | PHOTOELECTRICAL MEASURING DEVICE. | |
| Becconsall et al. | Reference-independent nuclear magnetic resonance solvent shifts | |
| JPH077061B2 (en) | Dosimeter compound cable | |
| WO1989008267A1 (en) | Arrangement for measuring the integral absorbed local dose of ambient high-energy radiation | |
| European Muon Collaboration et al. | A measurement of wide angle bremsstrahlung in a high energy muon scattering experiment as a check on the consistency of radiative correction calculations | |
| JPH07107808B2 (en) | Dosimeter composite cable | |
| Duffield et al. | The Disintegrations of Sn 121 and Sn 123 | |
| EP0036023B1 (en) | A method of estimating the insulation life of an electrical appliance incorporating a resin insulator | |
| Preedom et al. | The response of plastic scintillator to stopping protons in the energy range 70 to 100 MeV | |
| Samorski | Flash tube hodoscopes for particle density measurements | |
| Carrington et al. | Electron backscattering from a silicon detector from 0.182 to 0.579 MeV | |
| Geissel et al. | Energy loss and straggling of alpha particles in thin homogeneous NE-111 scintillator foils | |
| Blake | The muon content of EAS | |
| Panin et al. | Proportional chambers with delay line readout in the MD-1 detector | |
| AU2721077A (en) | Extruding polymer materials for high-voltage cables with cross-bound insulation | |
| Powell et al. | Fast neutron spectrum measurements in the MTR scandium and iron filtered beams | |
| Ito et al. | Gas amplification of proportional and SQS modes observed as a function of the radial distance of the position of primary ionization | |
| TOMPKINS | Measurement of thundercloud electric fields using cosmic ray shower ionization radio emission[Final Report, Jun. 1972- 31 May 1976] | |
| Green et al. | Facilities Support Group (FSG) | |
| DE2115265A1 (en) | Thermal neutron detector - with boron-coated aluminium plates separated by molybdenum grid counters | |
| Mass | State-diagnosed electron capture by OCS 3+ ions in collisions with atomic and molecular gases | |
| JPS5520490A (en) | Radiation transmission photographing unit | |
| ROLFS et al. | A new method for measurement of proton energies[Lemon Aid Preprint Series in Nuclear Physics] |