JP2971756B2 - Fluorescent glass dosimeter measuring device - Google Patents
Fluorescent glass dosimeter measuring deviceInfo
- Publication number
- JP2971756B2 JP2971756B2 JP6275721A JP27572194A JP2971756B2 JP 2971756 B2 JP2971756 B2 JP 2971756B2 JP 6275721 A JP6275721 A JP 6275721A JP 27572194 A JP27572194 A JP 27572194A JP 2971756 B2 JP2971756 B2 JP 2971756B2
- Authority
- JP
- Japan
- Prior art keywords
- fluorescent glass
- range
- measurement
- fluorescent
- pulse
- 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
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Radiation (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、蛍光ガラス線量計測定
装置に係り、特に、測定処理能力の向上を図るべく改良
を施した蛍光ガラス線量計測定装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent glass dosimeter measuring apparatus, and more particularly to a fluorescent glass dosimeter measuring apparatus which has been improved in order to improve measurement processing capability.
【０００２】[0002]
【従来の技術】レーザなどによる紫外線を放射線被曝蛍
光ガラスに照射すると、その被曝線量に相当する赤橙色
の蛍光（ラジオ・フォト・ルミネッセンス；以下、ＲＰ
Ｌと記す）が励起発光することが知られている。そこ
で、このＲＰＬを検出して上記蛍光ガラスの被曝線量を
測定する装置あるいは測定方法が種々提案されている。2. Description of the Related Art When a fluorescent glass is irradiated with ultraviolet rays by a laser or the like, red-orange fluorescent light (radio-photoluminescence; hereinafter referred to as RP) corresponding to the exposure dose is emitted.
L) is known to emit excited light. Therefore, various devices or measuring methods for detecting the RPL and measuring the exposure dose of the fluorescent glass have been proposed.
【０００３】ところで、紫外線により励起されたガラス
から発せられる蛍光には、そのガラス固有の蛍光（プレ
ドーズ）が多く含まれている。すなわち、放射線被曝を
受けていない蛍光ガラスにおいても、紫外線を照射する
と、そのガラス固有の蛍光を発する。このため、真の放
射線被曝によるＲＰＬだけを測定するには、光電子増倍
管によって検出されるガラスの蛍光成分から、上記プレ
ドーズの成分を差引くことが必要である。[0003] The fluorescence emitted from glass excited by ultraviolet rays contains a large amount of fluorescence (pre-dose) unique to the glass. That is, even if the fluorescent glass is not exposed to the radiation, it emits fluorescent light unique to the glass when irradiated with ultraviolet rays. Therefore, in order to measure only the RPL due to true radiation exposure, it is necessary to subtract the pre-dose component from the fluorescent component of the glass detected by the photomultiplier tube.
【０００４】本発明者等は、この様な観点から鋭意検討
を重ねた結果、上記プレドーズとＲＰＬとの減衰時定数
が大きく異なることを見出だし、特開昭５９−１９０６
８１号公報に示された様に、ＲＰＬだけを効率良く測定
する方法および測定装置を提案した。The inventors of the present invention have conducted intensive studies from such a viewpoint, and as a result, have found that the decay time constants of the pre-dose and the RPL are largely different.
As disclosed in Japanese Patent Publication No. 81, a method and a measuring device for efficiently measuring only RPL have been proposed.
【０００５】ところが、上記ＲＰＬの強度はプレドーズ
に比べて非常に小さいため、ＲＰＬを高感度に検出し、
その測定精度を高めるために、光電子増倍管のダイノー
ド印加電圧を高くして、その検出感度を高めることが考
えられている。◎しかしながら、このようにすると、プ
レドーズ検出時に上記光電子増倍管の陽極に過大電流が
流れ、光電子増倍管に疲労現象等の検出感度の劣化が生
じる等の不具合が生じたり、また、時には、光電子増倍
管が破損する等の事故が発生することがあった。However, since the intensity of the RPL is much smaller than that of the pre-dose, the RPL is detected with high sensitivity.
In order to increase the measurement accuracy, it has been considered to increase the voltage applied to the dynode of the photomultiplier to increase the detection sensitivity. ◎ However, in this case, an excessive current flows through the anode of the photomultiplier at the time of pre-dose detection, and a malfunction such as deterioration of detection sensitivity such as a fatigue phenomenon occurs in the photomultiplier, or sometimes, An accident such as breakage of the photomultiplier tube sometimes occurred.
【０００６】そこで、本発明者等はさらに検討を加え、
特公平４−７８１４４号公報に示された様に、光電子増
倍管へのダイノード電圧の印加を励起紫外線照射のタイ
ミングから所定時間遅延するように制御し、励起紫外線
パルスの照射によって上記放射線被曝蛍光ガラスに励起
される蛍光パルス成分の内、蛍光強度が強く、減衰の早
いプレドーズが十分減衰した後に、光電子増倍管が検出
動作するように構成した蛍光ガラス線量測定方法および
測定装置を提案した。Therefore, the present inventors have further studied,
As disclosed in Japanese Patent Publication No. 4-78144, the application of the dynode voltage to the photomultiplier tube is controlled so as to be delayed for a predetermined time from the timing of the irradiation of the excitation ultraviolet light, and the irradiation of the fluorescent light by irradiation with the excitation ultraviolet light pulse is performed. We have proposed a fluorescent glass dosimetry method and a measuring apparatus in which a photomultiplier tube performs a detection operation after a predose having a strong fluorescence intensity and a fast decay is sufficiently attenuated among fluorescent pulse components excited by glass.
【０００７】図４は、特公平４−７８１４４号公報に示
された蛍光ガラス線量計測定装置を概略図示したもので
ある。すなわち、トリガ回路１の信号を受けて窒素ガス
レーザ装置２から出たレーザ光は、紫外線透過フィルタ
３を介して散乱光等の迷光が除去された後、石英ガラス
などからなる半透鏡４によって分光され、標準蛍光ガラ
ス５と線量計ガラス６に照射され、それぞれを励起す
る。その結果、前記線量計ガラス６は被曝蛍光パルスを
発生し、また、標準蛍光ガラス５は標準蛍光パルスを発
生する。◎なお、前記標準蛍光ガラス５としては、例え
ば、あらかじめ一定量の放射線を被曝させた銀活性線量
計ガラスが用いられる。FIG. 4 schematically shows a fluorescent glass dosimeter measuring apparatus disclosed in Japanese Patent Publication No. 4-78144. That is, the laser light emitted from the nitrogen gas laser device 2 in response to the signal of the trigger circuit 1 is separated by the semi-transparent mirror 4 made of quartz glass or the like after the stray light such as scattered light is removed through the ultraviolet light transmitting filter 3. The standard fluorescent glass 5 and the dosimeter glass 6 are irradiated to excite each of them. As a result, the dosimeter glass 6 generates an exposure fluorescent pulse, and the standard fluorescent glass 5 generates a standard fluorescent pulse. ◎ As the standard fluorescent glass 5, for example, a silver active dosimeter glass previously exposed to a certain amount of radiation is used.
【０００８】この様にして、標準蛍光ガラス５および線
量計ガラス６から発生した蛍光は、それぞれ紫外線カッ
トフィルタ７，８を通過した後、それぞれフォトダイオ
ード９および光電子増倍管１０によって別個に検出され
る。そして、検出されたパルス信号は、前置増幅器１
１，１２、積分回路１３およびＡ／Ｄ変換回路１４を介
して、演算処理回路１５で被曝量として読み取られ、そ
の測定結果は、表示器１７に表示される。◎なお、前記
フォトダイオード９および光電子増倍管１０の受光面に
それぞれ設けられた紫外線カットフィルタ７，８は、前
記励起用の紫外線レーザ光がフォトダイオード９および
光電子増倍管１０へ入力するのを阻止するために配設さ
れている。In this way, the fluorescent light generated from the standard fluorescent glass 5 and the dosimeter glass 6 is separately detected by the photodiode 9 and the photomultiplier tube 10 after passing through the ultraviolet cut filters 7 and 8, respectively. You. Then, the detected pulse signal is supplied to the preamplifier 1
The exposure dose is read by the arithmetic processing circuit 15 via the integration circuit 13 and the A / D conversion circuit 14, and the measurement result is displayed on the display 17. The ultraviolet cut filters 7 and 8 provided on the light receiving surfaces of the photodiode 9 and the photomultiplier tube 10, respectively, allow the excitation ultraviolet laser light to enter the photodiode 9 and the photomultiplier tube 10. It is arranged to block.
【０００９】また、光電子増倍管１０に接続された高電
圧発生回路１６は、例えば、前記トリガ回路１による窒
素ガスレーザ装置２の起動信号を受けて、被曝蛍光パル
スのプレドーズが十分に減衰した時点で、光電子増倍管
１０のダイノード印加電圧を高くし、その検出感度を高
くするように制御することができるように構成されてい
る。The high-voltage generating circuit 16 connected to the photomultiplier tube 10 receives a start signal of the nitrogen gas laser device 2 by the trigger circuit 1, for example, when the pre-dose of the exposed fluorescent pulse is sufficiently attenuated. Thus, the configuration is such that the voltage applied to the dynode of the photomultiplier tube 10 can be increased and the detection sensitivity can be increased.
【００１０】さらに、光電子増倍管１０へのダイノード
電圧の印加に際しては、広い範囲にわたって精度の高い
測定を行うことができるようにするため、測定を複数の
レンジに分け、測定線量によって異なる電圧を印加する
ように構成されている。例えば、以下の様に複数のレン
ジに分けることができる。Furthermore, when applying a dynode voltage to the photomultiplier tube 10, the measurement is divided into a plurality of ranges and different voltages are varied depending on the measured dose in order to perform highly accurate measurement over a wide range. It is configured to apply. For example, it can be divided into a plurality of ranges as follows.
【００１１】 第１レンジ ： Ｒ1 ＞ｍ≧０ 第２レンジ ： Ｒ2 ＞ｍ≧Ｒ1 第３レンジ ： Ｒ3 ＞ｍ≧Ｒ2 第４レンジ ： Ｒ4 ＞ｍ≧Ｒ3 第５レンジ ： Ｒ5 ＞ｍ≧Ｒ4 （ｍは測定値） なお、Ｒ1 ＝１０００ Ｒ2 ＝１００００ Ｒ3 ＝１０００００ Ｒ4 ＝１００００００ Ｒ5 ＝９９９９９９９ （単位は、ＳｖまたはＧｙ） この様な構成を有する図４に示した蛍光ガラス線量計測
定装置においては、光電子増倍管１０は、プレドーズが
消滅した後のＲＰＬのみを高感度に検出することがで
き、また、測定線量によって異なる電圧を印加するよう
に構成したことにより、被曝線量が低い場合でも、広い
範囲にわたって精度の高い測定を行うことができるとい
う利点がある。First range: R 1 > m ≧ 0 Second range: R 2 > m ≧ R 1 Third range: R 3 > m ≧ R 2 Fourth range: R 4 > m ≧ R 3 Fifth range: R 5 > m ≧ R 4 (m is a measured value) Note that R 1 = 1000 R 2 = 10000 R 3 = 100000 R 4 = 1,000,000 R 5 = 9999999 (unit is Sv or Gy) A diagram having such a configuration In the fluorescent glass dosimeter measuring device shown in FIG. 4, the photomultiplier tube 10 can detect only the RPL after the pre-dose has disappeared with high sensitivity, and apply a different voltage depending on the measured dose. With this configuration, there is an advantage that highly accurate measurement can be performed over a wide range even when the exposure dose is low.
【００１２】[0012]
【発明が解決しようとする課題】しかしながら、上述し
た様な従来の蛍光ガラス線量計測定装置には、以下に述
べる様な問題点があった。即ち、従来の蛍光ガラス線量
計測定装置では、広い範囲にわたって精度の高い測定を
行うことができるようにするため、測定を複数のレンジ
に分け、測定線量によって異なる電圧を印加して測定を
行っている。However, the conventional fluorescent glass dosimeter measuring device as described above has the following problems. That is, in the conventional fluorescent glass dosimeter measuring device, in order to perform high-precision measurement over a wide range, the measurement is divided into a plurality of ranges, and different voltages are applied according to the measured dose to perform the measurement. I have.
【００１３】したがって、測定に際しては、あらかじめ
適切な測定レンジを決定するためのレンジ切替え測定が
必要となり、高線量測定用レンジ側（例えば、上記第５
レンジ）、すなわち低印加電圧側から、低線量測定用レ
ンジ側（例えば、上記第１レンジ）、すなわち高印加電
圧側へ、順次、レンジ切替えを行って、光電子増倍管１
０へ印加する電圧を上げていき、適切な高圧となったと
ころで測定を行なわなければならなかった。Therefore, at the time of measurement, range switching measurement for determining an appropriate measurement range is necessary in advance, and the high dose measurement range side (for example, the fifth
Range), that is, from the low applied voltage side to the low dose measurement range side (for example, the first range), that is, the high applied voltage side.
The voltage applied to 0 was increased, and the measurement had to be performed when the pressure reached an appropriate high voltage.
【００１４】例えば、第１レンジで測定されるべき被曝
量の低い蛍光ガラス線量計を測定する場合、 第５レンジで測定 ↓ 第４レンジで測定 ↓ 第３レンジで測定 ↓ 第２レンジで測定 ↓ レンジ決定 と順次、光電子増倍管１０の印加電圧を上げていくた
め、レンジ決定までに４回のレンジ切替えが必要であっ
た。For example, when measuring a fluorescent glass dosimeter with a low exposure dose to be measured in the first range, measure in the fifth range ↓ measure in the fourth range ↓ measure in the third range ↓ measure in the second range ↓ In order to increase the applied voltage of the photomultiplier tube 10 in sequence with the determination of the range, it was necessary to switch the range four times before determining the range.
【００１５】この様なレンジ切替えに要する時間は１回
当たり３〜４秒であり、光電子増倍管１０へ印加する電
圧を順次上げていく関係上、通常測定されることの多い
低被曝線量計の測定所要時間は増大し、装置の測定処理
能力も低下していた。◎特に、蛍光ガラス線量計は、主
として個人モニタリングに使用されるものであり、一般
に、その被曝量は低いものが多いと考えられるため、低
被曝線量の測定所要時間を短縮することが切望されてい
た。The time required for such range switching is 3 to 4 seconds at a time, and a low dose meter usually measured is often used because the voltage applied to the photomultiplier tube 10 is gradually increased. The measurement time required for the measurement increased, and the measurement processing capacity of the apparatus also decreased. ◎ In particular, fluorescent glass dosimeters are mainly used for personal monitoring, and it is generally considered that the exposure dose is low. Therefore, there is an urgent need to reduce the time required for measuring low exposure dose. Was.
【００１６】本発明は、上述した様な従来技術の欠点を
解消するために提案されたもので、その目的は、低被曝
線量計を測定するためのレンジ切替えに要する時間を短
縮し、測定処理能力を向上させた蛍光ガラス線量計測定
装置を提供することにある。The present invention has been proposed to solve the above-mentioned drawbacks of the prior art, and has as its object to reduce the time required for range switching for measuring a low-dose dosimeter and to reduce the time required for measurement processing. An object of the present invention is to provide a fluorescent glass dosimeter measuring device with improved ability.
【００１７】[0017]
【課題を解決するための手段】請求項１に記載の蛍光ガ
ラス線量計測定装置は、励起紫外線パルスを発生する窒
素ガスレーザと、上記励起紫外線パルスの一部を放射線
被曝蛍光ガラスに照射すると共に、前記励起紫外線パル
スの一部を標準蛍光ガラスに照射する光学系と、前記励
起紫外線パルスの照射により前記放射線被曝蛍光ガラス
に励起された蛍光パルスを検出する光電子増倍管と、前
記励起紫外線パルスの照射により前記標準蛍光ガラスに
励起された蛍光パルスを検出するフォトダイオードと、
前記光電子増倍管に印加するダイノード電圧を、複数の
レンジに分けて制御する高電圧制御回路と、前記フォト
ダイオード及び光電子増倍管により検出された前記各ガ
ラスの励起蛍光パルス成分から、適切なレンジを選択
し、その設定信号を前記高電圧制御回路に送ると共に、
前記放射線被曝蛍光ガラスの被曝線量を求める演算処理
回路とを具備したことを特徴とするものである。According to a first aspect of the present invention, there is provided a fluorescent glass dosimeter measuring device, comprising: a nitrogen gas laser for generating an excitation ultraviolet pulse; An optical system that irradiates a part of the excitation ultraviolet pulse to a standard fluorescent glass, a photomultiplier tube that detects a fluorescent pulse excited by the radiation-exposed fluorescent glass by irradiation of the excitation ultraviolet pulse, and A photodiode that detects a fluorescent pulse excited by the standard fluorescent glass by irradiation,
A dynode voltage applied to the photomultiplier tube is controlled by dividing the dynode voltage into a plurality of ranges, and an appropriate excitation fluorescence pulse component of each glass detected by the photodiode and the photomultiplier tube. Select a range and send its setting signal to the high voltage control circuit;
And an arithmetic processing circuit for calculating an exposure dose of the radiation-exposed fluorescent glass.
【００１８】また、請求項２に記載の発明は、請求項１
記載の蛍光ガラス線量計測定装置において、前記演算処
理回路が、１回の測定で所定の複数の範囲の判断を行
い、適切な測定レンジを判断して、前記高電圧制御回路
に設定信号を送るように構成されたことを特徴とするも
のである。The invention described in claim 2 is the same as the invention described in claim 1.
In the fluorescent glass dosimeter measuring device described above, the arithmetic processing circuit determines a plurality of predetermined ranges in one measurement, determines an appropriate measurement range, and sends a setting signal to the high voltage control circuit. It is characterized by having such a configuration.
【００１９】また、請求項３に記載の発明は、請求項１
または請求項２に記載の蛍光ガラス線量計測定装置にお
いて、前記フォトダイオードの代わりに、第２の光電子
増倍管を配設したことを特徴とするものである。Further, the invention described in claim 3 is the first invention.
Alternatively, in the fluorescent glass dosimeter measuring device according to claim 2, a second photomultiplier tube is provided instead of the photodiode.
【００２０】[0020]
【作用】請求項１乃至請求項３に記載の発明によれば、
演算処理回路が、１回の測定で所定の複数の範囲の判断
を行い、適切な測定レンジを判断して、高電圧制御回路
に設定信号を送り、また、高電圧制御回路が、その信号
にしたがって、光電子増倍管に所定の電圧を印加するこ
とができるので、通常測定されることの多い低被曝線量
計の線量測定において、測定レンジ決定のために要する
時間を大幅に短縮することができ、装置の測定処理能力
を向上できる。According to the first to third aspects of the present invention,
The arithmetic processing circuit determines a plurality of predetermined ranges in one measurement, determines an appropriate measurement range, sends a setting signal to the high voltage control circuit, and the high voltage control circuit Therefore, since a predetermined voltage can be applied to the photomultiplier, the time required to determine the measurement range can be significantly reduced in dose measurement of a low-dose dosimeter, which is usually measured. In addition, the measurement processing capability of the device can be improved.
【００２１】[0021]
【実施例】以下、本発明の蛍光ガラス線量計測定装置の
一実施例を、図１乃至図３に基づいて具体的に説明す
る。なお、図４に示した従来型と同一の部材には同一の
符号を付して、説明は省略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the fluorescent glass dosimeter measuring apparatus according to the present invention will be specifically described below with reference to FIGS. The same members as those of the conventional type shown in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.
【００２２】本実施例においては、図１に示した様に、
光電子増倍管１０には高電圧制御回路２０が接続され、
この高電圧制御回路２０が、前記光電子増倍管１０に印
加する電圧を複数のレンジに分けて制御するように構成
されている。なお、前記高電圧制御回路２０は、図３に
示した様に構成されている。In this embodiment, as shown in FIG.
A high voltage control circuit 20 is connected to the photomultiplier tube 10,
The high voltage control circuit 20 is configured to control the voltage applied to the photomultiplier tube 10 in a plurality of ranges. The high voltage control circuit 20 is configured as shown in FIG.
【００２３】一方、演算処理回路２１は、１回の測定で
所定の複数の範囲の判断を行い、適切な測定レンジを判
断して、前記高電圧制御回路２０に設定信号を送り、高
電圧制御回路２０によって光電子増倍管１０に所定の電
圧を印加することができるように構成されている。On the other hand, the arithmetic processing circuit 21 determines a plurality of predetermined ranges in one measurement, determines an appropriate measurement range, sends a setting signal to the high voltage control circuit 20, and The circuit 20 is configured so that a predetermined voltage can be applied to the photomultiplier tube 10.
【００２４】この様な構成を有する本実施例の蛍光ガラ
ス線量計測定装置は、以下の様に作用する。すなわち、
図２に示した様に、最も低い電圧（すなわち、第５レン
ジ）からレンジ切替えを行い、最も印加電圧の低い第５
レンジで測定し、第５レンジか（ｍ≧Ｒ4 ）、第４レン
ジか（Ｒ4 ＞ｍ≧Ｒ3 ）、第３レンジ以下か（Ｒ3 ＞
ｍ）の判断を行う。ここで、ｍ≧Ｒ4 であれば第５レン
ジで測定し、Ｒ4 ＞ｍ≧Ｒ3 であれば第４レンジで測定
する。The fluorescent glass dosimeter measuring apparatus of this embodiment having such a configuration operates as follows. That is,
As shown in FIG. 2, range switching is performed from the lowest voltage (that is, the fifth range), and the fifth applied voltage is the lowest.
Measure in the range, the fifth range (m ≧ R 4 ), the fourth range (R 4 > m ≧ R 3 ), the third range or less (R 3 >
m) is determined. Here, if m ≧ R 4 , measurement is performed in the fifth range, and if R 4 > m ≧ R 3 , measurement is performed in the fourth range.
【００２５】次に、第３レンジ以下（Ｒ3 ＞ｍ）と判断
した場合は、第３レンジに切替えて測定し、第３レンジ
（ｍ≧Ｒ2 ）か、第２レンジ（Ｒ2 ＞ｍ≧Ｒ1 ）か、第
１レンジか（Ｒ1 ＞ｍ）の判断を行う。ここで、ｍ≧Ｒ
2 であれば第３レンジで測定し、Ｒ2 ＞ｍ≧Ｒ1 であれ
ば第２レンジで測定し、Ｒ1 ＞ｍであれば第１レンジで
測定する。この様にして、演算処理回路２１内で測定レ
ンジが決定される。◎なお、上述した様に、最も低い電
圧からレンジ切替えを行う理由は、いきなり高電圧を印
加することにより、光電子増倍管１０がダメージを受け
ることがないようにするためである。Next, when it is judged that it is equal to or less than the third range (R 3 > m), the measurement is switched to the third range, and the measurement is performed in the third range (m ≧ R 2 ) or the second range (R 2 > m). ≧ R 1 ) or the first range (R 1 > m). Where m ≧ R
If it is 2 , the measurement is performed in the third range. If R 2 > m ≧ R 1 , the measurement is performed in the second range. If R 1 > m, the measurement is performed in the first range. In this way, the measurement range is determined in the arithmetic processing circuit 21. As described above, the reason for performing range switching from the lowest voltage is to prevent the photomultiplier tube 10 from being damaged by suddenly applying a high voltage.
【００２６】ここで、具体例をあげて本実施例を説明す
る。◎上述した様に、従来の測定方法では、第１レンジ
で測定されるべき被曝量の低い蛍光ガラス線量計を測定
する場合、 第５レンジで測定 ↓ 第４レンジで測定 ↓ 第３レンジで測定 ↓ 第２レンジで測定 ↓ レンジ決定 と順次、光電子増倍管１０の印加電圧を上げていくた
め、レンジ決定までに４回のレンジ切替えが必要であ
り、その所要時間は（３〜４秒／１回×４回＝１２〜１
６秒）であった。Here, the present embodiment will be described with reference to specific examples. ◎ As described above, in the conventional measurement method, when measuring a fluorescent glass dosimeter with a low exposure dose to be measured in the first range, measure in the fifth range ↓ measure in the fourth range ↓ measure in the third range ↓ Measurement in the second range ↓ Range determination In order to increase the applied voltage of the photomultiplier tube 10 sequentially, it is necessary to switch the range four times before determining the range, and the required time is (3 to 4 seconds / 1 time x 4 times = 12 to 1
6 seconds).
【００２７】これに対し、本実施例のレンジ切替え方法
では、 第５レンジで測定 ↓ 第３レンジで測定 ↓ レンジ決定 となり、２回のレンジ切替えで済むため、レンジ切替え
に要する時間は従来の半分に短縮される。この所要時間
の差は、１素子の測定に関してはわずかな差異である
が、大量の素子を連続測定する場合には大きな差とな
る。On the other hand, in the range switching method of the present embodiment, the measurement is performed in the fifth range ↓ The measurement is performed in the third range ↓ The range is determined, and the range switching is completed twice. Is shortened to This difference in required time is a slight difference when measuring one device, but a large difference when measuring a large number of devices continuously.
【００２８】この様に、本実施例によれば、通常測定さ
れることの多い低被曝線量計の線量測定において、測定
レンジ決定のために要する測定時間を大幅に短縮し、装
置の測定処理能力を向上できる。As described above, according to this embodiment, in the dose measurement of the low-dose dosimeter, which is usually measured, the measurement time required for determining the measurement range is greatly reduced, and the measurement processing capability of the apparatus is reduced. Can be improved.
【００２９】なお、本発明は、上述した実施例に限定さ
れるものではない。例えば、上記実施例においては、５
つのレンジがある場合について、１回の測定で３つの範
囲の判断をする場合を示したが、レンジの数は５つに限
定されるものではなく、また、可能であれば、１回の測
定でさらに多くの範囲の判断を行ってもよい。The present invention is not limited to the embodiment described above. For example, in the above embodiment, 5
In the case where there are three ranges, the case where three ranges are determined in one measurement is shown. However, the number of ranges is not limited to five, and if possible, one measurement is performed. More ranges may be determined.
【００３０】また、図１において、標準蛍光ガラスの蛍
光パルスの検出に用いられるフォトダイオード９の代わ
りに、第２の光電子増倍管を用いても良い。また、励起
紫外線の照射強度の安定性が補償される場合には、標準
蛍光ガラスの蛍光パルス検出を省略することも可能であ
る。In FIG. 1, a second photomultiplier tube may be used instead of the photodiode 9 used for detecting the fluorescent pulse of the standard fluorescent glass. Further, when the stability of the irradiation intensity of the excitation ultraviolet ray is compensated, the detection of the fluorescent pulse of the standard fluorescent glass can be omitted.
【００３１】[0031]
【発明の効果】以上述べた様に、本発明によれば、広い
範囲にわたって高い測定精度を維持しながら、通常測定
されることの多い低被曝線量計の測定に要する時間を短
縮し、測定処理能力を向上させた蛍光ガラス線量計測定
装置を提供することができる。As described above, according to the present invention, while maintaining high measurement accuracy over a wide range, the time required for measurement of a low-dose dosimeter, which is usually measured, is reduced, and the measurement processing is reduced. A fluorescent glass dosimeter measuring device with improved ability can be provided.
【図１】本発明の蛍光ガラス線量計測定装置の一実施例
の概略構成図FIG. 1 is a schematic configuration diagram of an embodiment of a fluorescent glass dosimeter measuring device according to the present invention.
【図２】図１に示した演算処理回路内での測定レンジ決
定手順の一例を示す図FIG. 2 is a diagram showing an example of a measurement range determination procedure in the arithmetic processing circuit shown in FIG.
【図３】図１に示した高電圧制御回路の回路構成の一例
を示す図FIG. 3 is a diagram showing an example of a circuit configuration of the high-voltage control circuit shown in FIG.
【図４】従来の蛍光ガラス線量計測定装置の概略構成図FIG. 4 is a schematic configuration diagram of a conventional fluorescent glass dosimeter measuring device.
１…トリガ回路 ２…窒素ガスレーザ ３…紫外線透過フィルタ ４…半透鏡 ５…標準蛍光ガラス ６…線量計ガラス ７，８…紫外線カットフィルタ ９…フォトダイオード １０…光電子増倍管 １１，１２…前置増幅器 １３…積分回路 １４…Ａ／Ｄ変換回路 １５…演算処理回路 １６…高電圧発生回路 １７…表示器 ２０…高電圧制御回路 ２１…演算処理回路 DESCRIPTION OF SYMBOLS 1 ... Trigger circuit 2 ... Nitrogen gas laser 3 ... Ultraviolet transmission filter 4 ... Semi-transmissive mirror 5 ... Standard fluorescent glass 6 ... Dosimeter glass 7,8 ... Ultraviolet cut filter 9 ... Photodiode 10 ... Photomultiplier tube 11,12 ... Amplifier 13 ... Integration circuit 14 ... A / D conversion circuit 15 ... Operation processing circuit 16 ... High voltage generation circuit 17 ... Display 20 ... High voltage control circuit 21 ... Operation processing circuit
Claims (3)
ーザと、 上記励起紫外線パルスの一部を放射線被曝蛍光ガラスに
照射すると共に、前記励起紫外線パルスの一部を標準蛍
光ガラスに照射する光学系と、 前記励起紫外線パルスの照射により前記放射線被曝蛍光
ガラスに励起された蛍光パルスを検出する光電子増倍管
と、 前記励起紫外線パルスの照射により前記標準蛍光ガラス
に励起された蛍光パルスを検出するフォトダイオード
と、 前記光電子増倍管に印加するダイノード電圧を、複数の
レンジに分けて制御する高電圧制御回路と、 前記フォトダイオード及び光電子増倍管により検出され
た前記各ガラスの励起蛍光パルス成分から、適切なレン
ジを選択し、その設定信号を前記高電圧制御回路に送る
と共に、前記放射線被曝蛍光ガラスの被曝線量を求める
演算処理回路とを具備したことを特徴とする蛍光ガラス
線量計測定装置。A nitrogen gas laser for generating an excitation ultraviolet pulse; an optical system for irradiating a part of the excitation ultraviolet pulse to a radiation-exposed fluorescent glass and irradiating a part of the excitation ultraviolet pulse to a standard fluorescent glass; A photomultiplier tube for detecting a fluorescent pulse excited on the radiation-exposed fluorescent glass by irradiation with the excitation ultraviolet pulse, and a photodiode for detecting a fluorescent pulse excited on the standard fluorescent glass by irradiation with the excitation ultraviolet pulse. A high-voltage control circuit that controls the dynode voltage applied to the photomultiplier in a plurality of ranges; and an excitation fluorescence pulse component of each of the glasses detected by the photodiode and the photomultiplier. Select the appropriate range, send the setting signal to the high-voltage control circuit, and the radiation-exposed fluorescent glass Fluorescent glass dosimeter measuring apparatus characterized by comprising a processing circuit for obtaining the exposure dose.
の複数の範囲の判断を行い、適切な測定レンジを判断し
て、前記高電圧制御回路に設定信号を送るように構成さ
れたことを特徴とする請求項１記載の蛍光ガラス線量計
測定装置。2. The arithmetic processing circuit is configured to determine a plurality of predetermined ranges in one measurement, determine an appropriate measurement range, and send a setting signal to the high voltage control circuit. The fluorescent glass dosimeter measuring device according to claim 1, wherein:
の光電子増倍管を配設したことを特徴とする請求項１ま
たは請求項２記載の蛍光ガラス線量計測定装置。3. The method according to claim 1, wherein a second diode is used instead of the photodiode.
The fluorescent glass dosimeter measuring device according to claim 1 or 2, wherein a photomultiplier tube is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6275721A JP2971756B2 (en) | 1994-10-14 | 1994-10-14 | Fluorescent glass dosimeter measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6275721A JP2971756B2 (en) | 1994-10-14 | 1994-10-14 | Fluorescent glass dosimeter measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08114674A JPH08114674A (en) | 1996-05-07 |
| JP2971756B2 true JP2971756B2 (en) | 1999-11-08 |
Family
ID=17559460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6275721A Expired - Lifetime JP2971756B2 (en) | 1994-10-14 | 1994-10-14 | Fluorescent glass dosimeter measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2971756B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001059939A (en) * | 1999-06-14 | 2001-03-06 | Olympus Optical Co Ltd | Sensitivity adjusting method for photomultiplier, scanning type laser microscope introducing the same method and recording medium recording sensitivity adjusting program |
| JP5422811B2 (en) * | 2010-07-08 | 2014-02-19 | Ａｇｃテクノグラス株式会社 | Glass dosimeter reader |
| JP6216533B2 (en) * | 2013-04-02 | 2017-10-18 | Ａｇｃテクノグラス株式会社 | Fluorescent glass dosimeter measuring method, fluorescent glass dosimeter measuring device |
| CN104955239A (en) * | 2015-07-06 | 2015-09-30 | 北京东方安杰科技有限公司 | System and method for continuously detecting light energy of light source |
-
1994
- 1994-10-14 JP JP6275721A patent/JP2971756B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08114674A (en) | 1996-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2971756B2 (en) | Fluorescent glass dosimeter measuring device | |
| EP0241268A2 (en) | Improved pulse light system fluorometer | |
| US5059806A (en) | Gas dosimeter reading method and apparatus | |
| JPS6394136A (en) | Method and instrument for fluorometric analysis | |
| JPS58137723A (en) | Apparatus for measuring temperature | |
| US4694176A (en) | Method and apparatus for indicating quench of a liquid scintillation solution | |
| JPS59190681A (en) | Method and apparatus for measuring glass dose | |
| JPS61292582A (en) | Method and apparatus for measuring glass dose | |
| US11747489B2 (en) | Dosimeter | |
| JPH09222482A (en) | Fluorescent glass dosemeter measuring device | |
| JP2977746B2 (en) | Fluorescent glass dosimeter measuring method and its measuring device | |
| US4724536A (en) | Instrument to measure fluorescence which has occurred in a sample stimulated by X rays | |
| JP2857296B2 (en) | Glass dosimeter | |
| JP2949134B2 (en) | Reference glass for fluorescent glass dosimeter | |
| Snyder et al. | Single photon counting lifetime measurements of weak, long-lived samples | |
| JPH05119155A (en) | Glass dose meter | |
| US3475099A (en) | Apparatus for spectrochemical analysis | |
| JP3014225B2 (en) | Radiation dose reader | |
| JP3136102B2 (en) | Photometric device | |
| CA1249076A (en) | Method and apparatus for indicating quench of a liquid scintillation solution | |
| JP4139093B2 (en) | Dose reading magazine, dose reading method and dose reading apparatus | |
| JPH0627816B2 (en) | Glass dose measuring method and measuring apparatus therefor | |
| RU2082963C1 (en) | Method for measurement of density of excited atoms in longitudinal nanosecond discharge | |
| JP3169346B2 (en) | Fluorescent glass dosimeter measuring device | |
| EP0181922B1 (en) | Method and apparatus for indicating quench of a liquid scintillation solution |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080827 Year of fee payment: 9 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080827 Year of fee payment: 9 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080827 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090827 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100827 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100827 Year of fee payment: 11 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110827 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110827 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120827 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120827 Year of fee payment: 13 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130827 Year of fee payment: 14 |
|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R313531 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130827 Year of fee payment: 14 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| EXPY | Cancellation because of completion of term |