JP2006234670A - Radiation detector and its test method - Google Patents

Radiation detector and its test method Download PDF

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JP2006234670A
JP2006234670A JP2005051431A JP2005051431A JP2006234670A JP 2006234670 A JP2006234670 A JP 2006234670A JP 2005051431 A JP2005051431 A JP 2005051431A JP 2005051431 A JP2005051431 A JP 2005051431A JP 2006234670 A JP2006234670 A JP 2006234670A
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JP4599188B2 (en
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Hirotaka Sakai
宏隆 酒井
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Toshiba Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiation detector and its test method capable of confirming soundness of operation of a discrimination level or the like, without using a bug source which is a feeble radiation source. <P>SOLUTION: This detector has a constitution equipped with a sensor part 1 which is sensitive to radiation and light, an amplifying part 2 for electrically transferring the output from the sensor part 1 to a subsequent stage, a discrimination part 3 for generating a logic pulse, when the output from the amplifying part 2 is over a prescribed value, a light emitting part 4 for allowing light to enter the sensor part 1, a light-emitting part driving part 5 for transmitting a signal for light emission from the light-emitting part 4, and a counting part 6 for counting the logic pulse generated from the discrimination part 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、半導体センサを備えた放射線検出器およびその健全性確認のための試験方法に関する。   The present invention relates to a radiation detector provided with a semiconductor sensor and a test method for confirming its soundness.

従来、原子力発電所等においてエリアモニタなどとして使用される半導体式放射線検出器においては、その健全性を確認する手段として、微弱な放射線源であるバグソースを内蔵し、その放射線をセンサ部に照射させることで動作確認を行ってきた。こうしたバグソースを用いない動作確認手段として、半導体式放射線検出器のセンサ部がＰＩＮ型等のフォトダイオードからなり光に有感であることを利用して、発光ダイオード(ＬＥＤ)等の発光素子を用いる手法が考えられる。   Conventionally, a semiconductor radiation detector used as an area monitor in a nuclear power plant or the like has a built-in bug source as a weak radiation source as a means to check its soundness and irradiates the sensor part with the radiation. We have confirmed the operation. As an operation check means without using such a bug source, a light emitting element such as a light emitting diode (LED) is used by utilizing the fact that the sensor part of the semiconductor type radiation detector is composed of a PIN type photodiode and is sensitive to light. A method to be used can be considered.

下記特許文献１には、ＬＥＤ等を用いた半導体式放射線検出器の健全性の確認方法の一つが示されているが、この手法はあくまで逆バイアス電圧の変化を検知するものであり、また、波高値を監視する装置が必要であるなど、放射線検出器の定常使用状態での故障検知を行い得る手法ではない。下記特許文献２に記載されている発明では、特許文献１の発明と同様に波高値を監視する装置が必要であり、また、ＬＥＤによる応答領域を放射線による応答領域と異なった点に設定するなど、はじめから放射線検出器の定常使用範囲の健全性確認を意図していない。また、半導体式放射線検出器の場合、弁別レベルを設定することで、センサ部からの出力の一定値以上のみを弁別して計数する構成となることが多いが、両発明とも、弁別レベルの健全性を確認する手段は提供していない。
特開平２−１２８１８４号公報 特開２００４−２３９７８３号公報 Patent Document 1 listed below shows one of the methods for confirming the soundness of a semiconductor radiation detector using an LED or the like, but this method only detects changes in the reverse bias voltage, It is not a technique that can detect a failure in a steady use state of a radiation detector, for example, a device for monitoring a peak value is necessary. In the invention described in the following Patent Document 2, a device for monitoring the crest value is required as in the invention of Patent Document 1, and the response area by the LED is set to a point different from the response area by the radiation. From the beginning, it is not intended to confirm the soundness of the normal use range of the radiation detector. In addition, in the case of semiconductor radiation detectors, it is often configured to discriminate and count only a certain value or more of the output from the sensor unit by setting a discrimination level. It does not provide a means of confirming.
JP-A-2-128184 JP 2004-239783 A

本発明は、微弱な放射線源であるバグソースを使用することなく、弁別レベル等の動作の健全性を確認することのできる放射線検出器およびその試験方法を提供することを目的とする。   An object of the present invention is to provide a radiation detector capable of confirming the soundness of operation such as a discrimination level without using a bug source which is a weak radiation source, and a test method thereof.

請求項１の発明は放射線検出器であり、放射線および光に有感なセンサ部と、前記センサ部からの出力を後段に電気的に伝える増幅部と、前記増幅部からの出力が所定の値以上であった場合に論理パルスを生成する弁別部と、前記センサ部に光を入射する発光部と、前記発光部の発光のための信号を送出する発光部駆動部と、前記弁別部において生成された論理パルスを計数する計数部とを備えている構成とする。   The invention according to claim 1 is a radiation detector, wherein a sensor unit sensitive to radiation and light, an amplifying unit for electrically transmitting an output from the sensor unit to a subsequent stage, and an output from the amplifying unit having a predetermined value Generated in the discriminating unit that generates a logic pulse in the case of the above, a light emitting unit that makes light incident on the sensor unit, a light emitting unit driving unit that sends a signal for light emission of the light emitting unit, and the discriminating unit And a counting unit that counts the logic pulses generated.

請求項５の発明は放射線検出器の試験方法であり、弁別部の弁別レベルを上回るように発光量を調整し、調整した前記発光量と定められた時間間隔で発光部を発光させ、前記発光部の発光による電気信号をセンサ部及び増幅部を通して前記弁別部に伝達し、前記弁別部からの論理パルスを計数部で計数し、前記計数部で得られる計数が発光部の発光回数に相当する分減少したことで前記センサ部、前記増幅部および前記弁別部の動作の異常を検出する方法とする。   The invention according to claim 5 is a radiation detector test method, wherein the light emission amount is adjusted so as to exceed the discrimination level of the discrimination unit, and the light emitting unit emits light at a time interval determined by the adjusted light emission amount. An electrical signal generated by the light emission of the unit is transmitted to the discrimination unit through the sensor unit and the amplification unit, the logic pulse from the discrimination unit is counted by the counting unit, and the count obtained by the counting unit corresponds to the number of times of light emission of the light emitting unit. It is a method for detecting an abnormality in the operation of the sensor unit, the amplification unit, and the discriminating unit due to the decrease.

本発明によれば、微弱な放射線源であるバグソースを使用することなく、弁別レベル等の動作の健全性を確認することのできる放射線検出器およびその試験方法を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the radiation detector which can confirm the soundness of operation | movement, such as a discrimination level, and its test method can be provided, without using the bug source which is a weak radiation source.

以下、本発明の第１ないし第４の実施の形態の放射線検出器を図面を参照して説明する。
（第１の実施の形態）
本実施の形態の放射線検出器は、図１に示すように、放射線および光に有感な半導体素子からなるセンサ部１と、センサ部１からの出力を後段に電気的に伝える増幅部２と、増幅部２からの出力が所定の値以上であった場合に論理パルスを生成する弁別部３と、センサ部１に対向しておかれた発光部４と、発光部４の発光のための信号を送出する発光部駆動部５と、弁別部３からの論理パルスを計数する計数部６からなる。 Hereinafter, radiation detectors according to first to fourth embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
As shown in FIG. 1, the radiation detector according to the present embodiment includes a sensor unit 1 made of a semiconductor element sensitive to radiation and light, and an amplification unit 2 that electrically transmits the output from the sensor unit 1 to the subsequent stage. The discriminating unit 3 for generating a logic pulse when the output from the amplifying unit 2 is a predetermined value or more, the light emitting unit 4 facing the sensor unit 1, and the light emitting unit 4 for light emission It comprises a light emitting unit driving unit 5 for sending a signal and a counting unit 6 for counting logic pulses from the discriminating unit 3.

発光部駆動部５からの信号により、発光部４は定められた時間間隔で定められた発光量で発光する。この発光による電気信号がセンサ部１及び増幅部２を通して弁別部３に伝達されるが、このときの電気信号の大きさが弁別部３における弁別レベルをわずかに上回るように発光部駆動部５を調整する。   In response to a signal from the light emitting unit driving unit 5, the light emitting unit 4 emits light with a predetermined light emission amount at a predetermined time interval. An electric signal generated by the light emission is transmitted to the discrimination unit 3 through the sensor unit 1 and the amplification unit 2, and the light emission unit driving unit 5 is set so that the magnitude of the electric signal at this time slightly exceeds the discrimination level in the discrimination unit 3. adjust.

この構成によれば、弁別部３の弁別レベルが上昇した場合、あるいはセンサ部１の感度が低下した場合、あるいは増幅部２の増幅率が減少した場合、それぞれ計数部６で得られる計数が発光部４の発光回数に相当する分減少する。   According to this configuration, when the discrimination level of the discrimination unit 3 is increased, the sensitivity of the sensor unit 1 is decreased, or the amplification factor of the amplification unit 2 is decreased, the counts obtained by the counting unit 6 are emitted. It decreases by the amount corresponding to the number of times of light emission of the section 4.

従って、本実施の形態によれば、センサ部１、増幅部２および弁別部３の動作の異常を検出することができ、微弱な放射線源であるバグソースを使用することなく、動作の健全性を、特に弁別レベルの健全性も含めて確認することのできる放射線検出器を提供することができる。   Therefore, according to the present embodiment, it is possible to detect abnormalities in the operation of the sensor unit 1, the amplification unit 2 and the discrimination unit 3, and the soundness of the operation without using a bug source which is a weak radiation source. In particular, it is possible to provide a radiation detector capable of confirming the soundness including the soundness of the discrimination level.

（第２の実施の形態）
本実施の形態では、第１の実施の形態（図１）における発光駆動部５を、発光部４の発光によりセンサ部１及び増幅部２を通して得られる電気信号が弁別部３に伝達されたときの大きさが、弁別部３の弁別レベルをわずかに下回るように調整する。 (Second Embodiment)
In the present embodiment, when the light emission driving unit 5 in the first embodiment (FIG. 1) is transmitted to the discriminating unit 3 through the sensor unit 1 and the amplification unit 2 by the light emission of the light emitting unit 4. Is adjusted to be slightly lower than the discrimination level of the discriminator 3.

この構成によれば、弁別部３の弁別レベルが低下した場合、あるいはセンサ部１の感度が上昇した場合、あるいは増幅部２の増幅率が増加した場合、それぞれ計数部６で得られる計数が発光部４の発光回数に相当する分増加する。   According to this configuration, when the discrimination level of the discriminating unit 3 is lowered, when the sensitivity of the sensor unit 1 is increased, or when the amplification factor of the amplifying unit 2 is increased, the count obtained by the counting unit 6 is emitted. It increases by the amount corresponding to the number of times of light emission of the section 4.

従って、本実施の形態によれば、センサ部１、増幅部２および弁別部３の動作の異常を検出することができ、微弱な放射線源であるバグソースを使用することなく、動作の健全性を、特に弁別レベルの健全性も含めて確認することのできる放射線検出器を提供することができる。   Therefore, according to the present embodiment, it is possible to detect abnormalities in the operation of the sensor unit 1, the amplification unit 2 and the discrimination unit 3, and the soundness of the operation without using a bug source which is a weak radiation source. In particular, it is possible to provide a radiation detector capable of confirming the soundness including the soundness of the discrimination level.

（第３の実施の形態）
本実施の形態の放射線検出器は、図２に示すように、放射線および光に有感な半導体素子からなるセンサ部１と、センサ部１からの出力を後段に電気的に伝える増幅部２と、増幅部２からの出力が所定の値以上であった場合に論理パルスを生成する弁別部３と、センサ部１に対向しておかれた第１および第２の発光部４ａ，４ｂと、発光部４ａ，４ｂの発光のための信号を送出する第１および第２の発光部駆動部５ａ，５ｂと、弁別部３からの論理パルスを計数する計数部６からなる。 (Third embodiment)
As shown in FIG. 2, the radiation detector according to the present embodiment includes a sensor unit 1 made of a semiconductor element sensitive to radiation and light, and an amplification unit 2 that electrically transmits the output from the sensor unit 1 to the subsequent stage. A discriminating unit 3 that generates a logic pulse when the output from the amplifying unit 2 is equal to or greater than a predetermined value, and first and second light emitting units 4a and 4b facing the sensor unit 1, The light emitting units 4a and 4b include first and second light emitting unit driving units 5a and 5b that transmit signals for light emission, and a counting unit 6 that counts logic pulses from the discriminating unit 3.

第１および第２の発光部駆動部５ａ，５ｂからの信号により、第１および第２の発光部４ａ，４ｂは定められた時間間隔で定められた発光量で発光する。この発光による電気信号がセンサ部１及び増幅部２を通して弁別部３に伝達されるが、このときの電気信号の大きさが弁別部３における弁別レベルをわずかに上回るように第１の発光部駆動部５ａを調整する。   The first and second light emitting units 4a and 4b emit light with a light emission amount determined at predetermined time intervals based on signals from the first and second light emitting unit driving units 5a and 5b. The electric signal generated by the light emission is transmitted to the discriminating unit 3 through the sensor unit 1 and the amplifying unit 2, and the first light emitting unit is driven so that the magnitude of the electric signal at this time slightly exceeds the discrimination level in the discriminating unit 3. Adjust the part 5a.

第２の発光部駆動部５ｂは、センサ部１及び増幅部２を通して得られる第２の発光部４ｂの発光による電気信号が弁別部３に伝達されたときの電気信号の大きさが、弁別部３の弁別レベルをわずかに下回るように調整する。   The second light emitting unit driving unit 5b is configured such that the magnitude of the electric signal when the electric signal by the light emission of the second light emitting unit 4b obtained through the sensor unit 1 and the amplifying unit 2 is transmitted to the discriminating unit 3 is the discriminating unit. Adjust to slightly below the discrimination level of 3.

第１の発光部駆動部５ａの発光駆動周波数をA Hz、第２の発光部駆動部５ｂの発光駆動周波数をB Hz(但しA≠B)とした場合、弁別部３の弁別レベルが上昇した場合、あるいはセンサ部１の感度が低下する方向に変化した場合、あるいは増幅部２の増幅率が減少した場合、それぞれ計数部６で得られる計数が第１の発光部４ａの発光回数であるA Hzに相当する分低下する。また、弁別部３の弁別レベルが低下した場合、あるいはセンサ部１の感度が向上する方向に変化した場合、あるいは増幅部２の増幅率が増加した場合には、それぞれ計数部６で得られる計数が第２の発光部４ｂの発光回数であるB Hzに相当する分増加することになる。   When the light emission driving frequency of the first light emitting unit driving unit 5a is A Hz and the light emission driving frequency of the second light emitting unit driving unit 5b is B Hz (A ≠ B), the discrimination level of the discriminating unit 3 is increased. In this case, or when the sensitivity of the sensor unit 1 changes in a decreasing direction, or when the amplification factor of the amplification unit 2 decreases, the count obtained by the counting unit 6 is the number of times of light emission of the first light emitting unit 4a. Decreases by the amount corresponding to Hz. Further, when the discrimination level of the discriminating unit 3 decreases, when the sensitivity of the sensor unit 1 changes in a direction to improve, or when the amplification factor of the amplifying unit 2 increases, the counts obtained by the counting unit 6 are respectively obtained. Increases by the amount corresponding to B Hz, which is the number of times of light emission of the second light emitting unit 4b.

従って、本実施の形態によれば、センサ部１、増幅部２および弁別部３の動作の異常を検出することができ、微弱な放射線源であるバグソースを使用することなく、動作の健全性を、特に弁別レベルの健全性も含めて確認することのできる放射線検出器を提供することができる。   Therefore, according to the present embodiment, it is possible to detect abnormalities in the operation of the sensor unit 1, the amplification unit 2 and the discrimination unit 3, and the soundness of the operation without using a bug source which is a weak radiation source. In particular, it is possible to provide a radiation detector capable of confirming the soundness including the soundness of the discrimination level.

なお、ここでは発光部を２個としたが、これを３個以上とし、それぞれの発光量を変化させることで、弁別レベル等の変化した程度を段階的に検知することができる。その際の周波数の組合せとして、例えば２のｎ乗の周波数の組合せとする(例えば1 Hz, 2 Hz, 4 Hz, 8 Hz)ことによって、それらの重ねあわせである計数部６で得られる計数率により、どのレベルで問題が起きているかを検知することができる。   Although two light emitting units are used here, the number of the light emitting units is set to three or more, and the amount of light emitted can be changed to detect the degree of change in the discrimination level in a stepwise manner. As a combination of frequencies at that time, for example, a combination of frequencies of 2 to the power of 2 (for example, 1 Hz, 2 Hz, 4 Hz, 8 Hz), the counting rate obtained by the counting unit 6 that is a superposition thereof is obtained. It is possible to detect at which level the problem has occurred.

（第４の実施の形態）
本実施の形態は、第１の実施の形態（図１）において、発光部駆動部５を、２種類の設定で動作させるようにした構成である。 (Fourth embodiment)
The present embodiment has a configuration in which the light emitting unit driving unit 5 is operated with two types of settings in the first embodiment (FIG. 1).

発光部駆動部５の第１の発光駆動周波数をA Hz、第２の発光駆動周波数をB Hz(但しA≠B)とする。第１の発光駆動部周波数A Hzは、センサ部１及び増幅器２を通して得られる発光部４の発光による電気信号が弁別部３に伝達されたときの電気信号の大きさが、弁別部３の弁別レベルをわずかに上回るように調整する。第２の発光駆動周波数B Hzは、センサ部１及び増幅器２を通して得られる発光部４の発光による電気信号が弁別部３に伝達されたときの電気信号の大きさが、弁別部３の弁別レベルをわずかに下回るように調整する。   The first light emission drive frequency of the light emission part drive part 5 is set to A Hz, and the second light emission drive frequency is set to B Hz (where A ≠ B). The first light emission drive unit frequency A Hz is based on the discrimination of the discrimination unit 3 when the electrical signal generated by the light emission unit 4 obtained through the sensor unit 1 and the amplifier 2 is transmitted to the discrimination unit 3. Adjust to slightly above the level. The second light emission drive frequency B Hz is based on the discrimination level of the discriminator 3 when the electric signal generated by the light emission of the light emitter 4 obtained through the sensor unit 1 and the amplifier 2 is transmitted to the discriminator 3. Adjust to slightly below

このような構成においては、弁別部３の弁別レベルが上昇したとき、あるいはセンサ部１の感度が低下する方向に変化したとき、あるいは増幅部２の増幅率が減少したとき、それぞれ計数部６で得られる計数がA Hzに相当する分低下する。また、弁別部３の弁別レベルが低下したとき、あるいはセンサ部１の感度が向上する方向に変化したとき、あるいは増幅部２の増幅率が増加したとき、それぞれ計数部６で得られる計数がB Hzに相当する分増加することになる。   In such a configuration, when the discrimination level of the discriminating unit 3 increases, when the sensitivity of the sensor unit 1 changes in a decreasing direction, or when the gain of the amplifying unit 2 decreases, the counting unit 6 The resulting count is reduced by an amount corresponding to A Hz. Further, when the discrimination level of the discrimination unit 3 is decreased, when the sensitivity of the sensor unit 1 is changed in a direction to improve, or when the amplification factor of the amplification unit 2 is increased, the count obtained by the counting unit 6 is B It will increase by the amount corresponding to Hz.

従って、本実施の形態によれば、センサ部１、増幅部２および弁別部３の動作の異常を検出することができ、微弱な放射線源であるバグソースを使用することなく、動作の健全性を、特に弁別レベルの健全性も含めて確認することのできる放射線検出器を提供することができる。   Therefore, according to the present embodiment, it is possible to detect abnormalities in the operation of the sensor unit 1, the amplification unit 2 and the discrimination unit 3, and the soundness of the operation without using a bug source which is a weak radiation source. In particular, it is possible to provide a radiation detector capable of confirming the soundness including the soundness of the discrimination level.

なお、ここでは発光駆動部５の設定を２種類としたが、これを３種類以上とし、それぞれの発光量を変化させることで、弁別レベル等の変化した程度を段階的に検知することができる。その際の周波数の組合せとして、例えば２のｎ乗の周波数の組合せとする(例えば1 Hz,2 Hz, 4 Hz,8 Hz)ことによって、それらの重ねあわせである計数部６で得られる計数率により、どのレベルで問題が起きているかを検知することができる。   Here, although two types of settings of the light emission drive unit 5 are used, it is possible to detect the degree of change of the discrimination level or the like step by step by changing the light emission amount to three or more types. . As a combination of frequencies at that time, for example, a combination of frequencies of 2 to the power of 2 (for example, 1 Hz, 2 Hz, 4 Hz, and 8 Hz), the counting rate obtained by the counting unit 6 that is a superposition of them is obtained. It is possible to detect at which level the problem has occurred.

なお、上記第１から第４の実施の形態において、発光部４，４ａ，４ｂの発光量をセンサ部１とは別に測定し、その測定値に応じて発光部駆動部５，５ａ，５ｂを調整する発光量調整回路を有する構成としてもよい。こうした構成をとることで、発光部４，４ａ，４ｂの経時変化などによる発光量の変化を補正することができる。その結果、健全性確認より安定して行うことのできる放射線検出器を提供することができる。   In the first to fourth embodiments, the light emission amounts of the light emitting units 4, 4a, 4b are measured separately from the sensor unit 1, and the light emitting unit driving units 5, 5a, 5b are set according to the measured values. It is good also as a structure which has the light emission amount adjustment circuit to adjust. By adopting such a configuration, it is possible to correct a change in light emission amount due to a change with time of the light emitting units 4, 4 a, 4 b. As a result, it is possible to provide a radiation detector that can be performed more stably than soundness confirmation.

本発明の第１、第２および第４の実施の形態の放射線検出器のブロック図。The block diagram of the radiation detector of the 1st, 2nd and 4th embodiment of this invention. 本発明の第３の実施の形態の放射線検出器のブロック図。The block diagram of the radiation detector of the 3rd Embodiment of this invention.

符号の説明Explanation of symbols

１…センサ部、２…増幅部、３…弁別部、４…発光部、４ａ…第１の発光部、４ｂ…第２の発光部、５…発光部駆動部、５ａ…第１の発光部駆動部、５ｂ…第２の発光部駆動部、６…計数部。   DESCRIPTION OF SYMBOLS 1 ... Sensor part, 2 ... Amplification part, 3 ... Discrimination part, 4 ... Light emission part, 4a ... 1st light emission part, 4b ... 2nd light emission part, 5 ... Light emission part drive part, 5a ... 1st light emission part Driving unit, 5b ... second light emitting unit driving unit, 6 ... counting unit.

Claims (5)

放射線および光に有感なセンサ部と、前記センサ部からの出力を電気的に伝える増幅部と、前記増幅部からの出力が所定の値以上であった場合に論理パルスを生成する弁別部と、前記センサ部に光を入射する発光部と、前記発光部の発光のための信号を送出する発光部駆動部と、前記弁別部において生成された論理パルスを計数する計数部とを備えていることを特徴とする放射線検出器。   A sensor unit sensitive to radiation and light; an amplifying unit for electrically transmitting an output from the sensor unit; and a discriminating unit for generating a logic pulse when the output from the amplifying unit is a predetermined value or more. A light emitting unit that makes light incident on the sensor unit, a light emitting unit driving unit that sends a signal for light emission of the light emitting unit, and a counting unit that counts the logic pulses generated in the discriminating unit. A radiation detector characterized by that. 前記発光部および前記発光部駆動部は複数組設けられていることを特徴とする請求項１記載の放射線検出器。   The radiation detector according to claim 1, wherein a plurality of sets of the light emitting unit and the light emitting unit driving unit are provided. 前記発光部駆動部は、複数の発光周波数とそれに対応した異なる発光量指令を出力することを特徴とする請求項１記載の放射線検出器。   The radiation detector according to claim 1, wherein the light emitting unit driving unit outputs a plurality of light emission frequencies and different light emission amount commands corresponding thereto. 前記発光部の発光量を測定しその測定値に応じて前記発光部駆動部に発光量を調整する信号を送出する発光量調整回路を備えていることを特徴とする請求項１記載の放射線検出器。   The radiation detection according to claim 1, further comprising a light emission amount adjusting circuit that measures a light emission amount of the light emitting unit and sends a signal for adjusting the light emission amount to the light emitting unit driving unit according to the measured value. vessel. 弁別部の弁別レベルを上回るように発光量を調整し、調整した前記発光量と定められた時間間隔で発光部を発光させ、前記発光部の発光による電気信号をセンサ部及び増幅部を通して前記弁別部に伝達し、前記弁別部からの論理パルスを計数部で計数し、前記計数部で得られる計数が発光部の発光回数に相当する分減少したことで前記センサ部、前記増幅部および前記弁別部の動作の異常を検出することを特徴とした放射線検出器の試験方法。

The light emission amount is adjusted to exceed the discrimination level of the discriminating unit, the light emitting unit is caused to emit light at a predetermined time interval with the adjusted light emission amount, and the electric signal generated by the light emission of the light emitting unit is transmitted through the sensor unit and the amplifying unit. And the logical pulse from the discriminating unit is counted by the counting unit, and the sensor unit, the amplifying unit, and the discriminating unit are reduced because the count obtained by the counting unit is reduced by an amount corresponding to the number of times of light emission of the light emitting unit. A test method for a radiation detector, characterized by detecting an abnormality in the operation of a part.

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