JP7329998B2 - Radiation detector - Google Patents

Description

The present invention relates to a radiation detection device.

Conventionally, unsealed radioactive materials are handled in radiation controlled areas, but if radioactive materials scatter on desks, floors, walls, corridors, etc. due to accident or carelessness, radioactive contamination by radioactive materials may occur. If the radioactive substance is not contained in a colored solvent or the like, it is colorless and transparent, or the amount is extremely small, so the location and extent of contamination cannot be determined. In that case, it is necessary to map and measure the radiation emitted by the radioactive material using a radiation measuring instrument such as a GM detector or a scintillation survey meter to specify the location and range. Mapping measurements require a lot of time and effort. In addition, since it is usually difficult to measure the entire area within the controlled area, there is a possibility that an oversight will occur if the measurement is carried out centering on areas where contamination is assumed.

After identifying the contaminated area, perform decontamination work such as wiping to remove the contamination. After the decontamination work is done, the measurement is carried out again to confirm whether the decontamination is completed. If radioactive substances still remain, decontamination is performed again and the measurement is repeated. As described above, since the presence or absence of radioactive substances cannot be easily confirmed by visual observation or the like, decontamination work requires a great deal of labor.

On the other hand, as a conventional radioactivity measuring device, for example, the one shown in Patent Document 1 is known. This device measures the distribution of radioactivity using a radioactivity detection device comprising a multi-collimator including a spherical shield and a plurality of γ-ray detectors, and has processing means. A multi-collimator is a shield selected in the shape of a spherical shell, and in order to limit the incident direction of radiation, a plurality of cylindrical through-holes are formed on the spherical shell to arrange a plurality of collimators. A plurality of γ-ray detectors are arranged corresponding to each of the plurality of collimators and individually detect radiation in a specific field of view limited by the corresponding collimator. The processing means performs smoothing processing and interpolation processing based on the signal acquired by each γ-ray detector, subdivides into a finer mesh than the detection field of one γ-ray detector, and obtains a subdivided signal intensity distribution. Calculate

Further, as a conventional radiation measuring device, for example, one disclosed in Patent Document 2 is known. This apparatus comprises radiation intensity distribution detecting means for obtaining a radiation intensity distribution in the object space at desired azimuth and elevation angles, radiation dose detecting means for detecting the radiation dose rate in the object space, and one point in the object space. A radiation intensity distribution covering all directions centering on the one point obtained by using a plurality of different radiation intensity distributions obtained by the radiation intensity distribution detecting means, the radiation dose rate, spatial layout information of the target space, and Based on the positional information of the radiation intensity distribution detection means and the radiation dose detection means, the radiation intensity distribution covering all directions, the position where the radiation dose detection means is arranged, and the relevant point are displayed in the image showing the layout of the target space. and an image generation unit that generates an image in which the radiation dose rate of is superimposed.

JP 2017-020820 A JP 2016-080529 A

However, the above conventional patent document 1 requires complicated subdivision processing, and the above conventional patent document 2 requires complicated image processing, so both places and ranges of radioactive contamination can be instantly confirmed. difficult to do. Therefore, there is a demand for a technology that can instantly confirm the location and extent of contamination.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a radiation detection apparatus capable of instantaneously confirming the location and range of contamination.

In order to solve the above-described problems and achieve the object, a radiation detection apparatus according to the present invention is an apparatus for detecting radiation from a radioactive substance, and is arranged at different positions of an object to detect radiation. a plurality of cells, detection means provided in each cell for detecting radiation, and light emission means for emitting light according to the detected radiation.

Further, according to another radiation detection apparatus according to the present invention, in the above-described invention, each cell is arranged in a mesh on a planar main body.

Further, according to another radiation detection apparatus according to the present invention, in the invention described above, the planar main body is used as a surface material for indoor walls, floors, and fixtures.

A radiation detection apparatus according to the present invention is an apparatus for detecting radiation from a radioactive substance, and includes a plurality of cells arranged at different positions on an object to detect the radiation, and a plurality of cells provided in each cell. Since the detection means for detecting radiation and the light emitting means for emitting light according to the detected radiation are provided, the cell at the position where the radiation is detected emits light, so that the place and range of radioactive contamination by radioactive substances can be instantly confirmed. It has the effect of being able to

Further, according to another radiation detection apparatus according to the present invention, each cell is arranged in a mesh pattern on the planar main body. The effect is that the contaminated place and range can be instantly confirmed.

In addition, according to another radiation detection apparatus according to the present invention, since the planar main body is used as a surface material for indoor walls, floors, and fixtures, it is possible to detect the location at the time when radioactive contamination due to radioactive substances occurs. and the range can be easily specified.

FIG. 1 is a schematic perspective view showing an embodiment of a radiation detection apparatus according to the invention. FIG. 2 is an indoor perspective view showing an embodiment of a radiation detection device according to the present invention.

(Basic principle of the present invention)
First, the basic principle of the present invention will be explained.
In general, radioactive materials emit gamma rays, beta rays, alpha rays, neutron rays, etc. according to their own decay formula when decaying. The emitted β-rays, α-rays, and neutron rays react with substances to produce γ-rays (X-rays). Therefore, the radioactive material will eventually generate γ-rays (X-rays) regardless of the decay method. The energy of γ-rays (X-rays) is higher than that of visible light.

On the other hand, a solar cell can directly absorb the energy of light with electrons (photoexcitation), guide the electrons to the outside by an electric field, and extract electric power. A general solar cell has a structure in which p-type and n-type semiconductors are joined (pn junction diode).

A light emitting diode (LED) is basically a pn junction semiconductor structure that directly converts the energy of electrons into light energy. One type of organic electroluminescence (organic EL) consists of a light-emitting diode whose light-emitting layer is made of an organic compound, and emits light by excitons generated by recombination of electrons and holes injected into the organic compound. .

Therefore, the present inventors have proposed incorporating a pn junction diode of a solar cell and a semiconductor structure of an LED or a light-emitting layer of an organic EL into a square cell with a side of 1 mm to several cm, and combining the two via electrons. Thought. It would be best if one pn junction diode could be shared between the solar cell and the LED. When these cells are arranged in a flat mesh on a single sheet, γ-rays (X-rays) generated from radioactive materials enter this sheet and electrons excited by the solar cells are taken into the LED, generating visible light. Therefore, by recognizing this light, the user can clearly know the location of the radioactive substance. The present invention has been made based on such an idea.

(Embodiment of the present invention)
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a radiation detection apparatus according to the present invention will be described in detail below with reference to the drawings. In addition, this invention is not limited by this embodiment.

As shown in FIG. 1, a radiation detection apparatus 10 according to the present invention is an apparatus for detecting radiation from a radioactive substance, and includes a sheet-like (planar) main body 12 and a mesh-like member on the surface of the main body 12 . and a plurality of cells 14 arranged in a row. Each cell 14 is provided with detection means 16 for detecting radiation and light emission means 18 for emitting light according to the detected radiation.

The sheet-like main body 12 can be made of a resin-based material such as epoxy resin or linoleum, or a material such as plastic as a base material. The main body 12 can be made of a bendable plate material. The cells 14 can be configured, for example, as square grids with sides of 1 mm to several cm.

The detection means 16 is composed of a pn junction type diode of a solar cell. The light emitting means 18 is composed of a semiconductor structure of an LED or a light emitting layer of an organic EL. The sensing means 16 and the light emitting means 18 are electronically coupled to each other. It would be best if one pn junction diode could be shared between the solar cell and the LED. If the amount of electrons excited by the solar cell is insufficient for the LED to emit light, it is preferable to provide the sheet-like main body 12 with the function of multiplying the electrons by an external power supply. It may also have a function of judging the concentration of radioactive contamination from the amount of light emitted from the light emitting means 18 (brightness of light) and notifying the result of the judgment.

According to this embodiment, γ-rays (X-rays) generated from a radioactive material enter this sheet-like main body 12, and electrons excited by the solar cells of the detection means 16 in the cells 14 are emitted to the LEDs of the light-emitting means 18. Visible light is generated when captured. Since the cell 14 at the position where the radiation is detected emits light, the user can instantly confirm the location and range of radioactive contamination by the radioactive material by recognizing this light. In addition, it is possible to immediately confirm whether or not the radioactive substances have been removed by the decontamination work.

As shown in FIG. 2, the radiation detection apparatus 10 may be used as, for example, a desk (furniture) surface material 20, a floor material 22, or a wall material 24 (surface material). In this way, it is possible to easily specify the place and range when radioactive contamination by radioactive substances occurs.

Moreover, the sheet-like main body 12 of the radiation detection apparatus 10 may be configured to be portable. In this way, the place and range of radioactive contamination can be easily confirmed simply by placing it in a place where radioactive contamination is suspected. It is possible to investigate not only radioactive contamination by radioactive materials, but also the amount and extent of activation products caused by neutrons in nuclear reactors and accelerator facilities.

In the above embodiment, the case where the plurality of cells 14 are arranged in a mesh pattern on the sheet-like main body 12 has been described as an example, but the present invention is not limited to this. The plurality of cells 14 may be arranged in any manner as long as they are arranged at different positions on the target for detecting radiation. In the above embodiment, the case where the radiation detection apparatus 10 includes the sheet-shaped body 12 has been described as an example, but the present invention is not limited to this, and the body does not have to be sheet-shaped. Even if it does as these, the same effect as the above can be produced.

As described above, the radiation detection apparatus according to the present invention is an apparatus for detecting radiation from a radioactive substance, comprising: a plurality of cells arranged at different positions on an object for detecting radiation; Since each cell is provided with a detection means for detecting radiation and a light emitting means for emitting light according to the detected radiation, the cell at the position where the radiation is detected emits light. The range can be checked instantly.

Further, according to another radiation detection apparatus according to the present invention, each cell is arranged in a mesh pattern on the planar main body. Contaminated locations and extents can be confirmed instantly.

In addition, according to another radiation detection apparatus according to the present invention, since the planar main body is used as a surface material for indoor walls, floors, and fixtures, it is possible to detect the location at the time when radioactive contamination due to radioactive substances occurs. and range can be easily identified.

INDUSTRIAL APPLICABILITY As described above, the radiation detection apparatus according to the present invention is useful for radiation handling facilities and the like, and is particularly suitable for instantly confirming the location and range of radioactive contamination.

REFERENCE SIGNS LIST 10 radiation detection device 12 main body 14 cell 16 detection means 18 light emission means 20 surface material 22 floor material 24 wall material

Claims (3)

A device for detecting radiation from radioactive material,
A plurality of cells arranged at different positions of an object for detecting radiation, detection means provided in each cell for detecting radiation, and light emitting means for emitting light according to the detected radiation ,
1. A radiation detecting apparatus according to claim 1, wherein said detecting means is composed of a pn junction type diode, and said light emitting means is composed of a semiconductor structure of an LED or a light emitting layer of an organic EL. 2. The radiation detection apparatus according to claim 1, wherein each cell is arranged in a mesh on the planar main body. 3. The radiation detection apparatus according to claim 2, wherein the planar main body is used as a surface material for indoor walls, floors, and furniture.

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