JP2737100B2 - Dose calibration method - Google Patents
Dose calibration methodInfo
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- JP2737100B2 JP2737100B2 JP21290993A JP21290993A JP2737100B2 JP 2737100 B2 JP2737100 B2 JP 2737100B2 JP 21290993 A JP21290993 A JP 21290993A JP 21290993 A JP21290993 A JP 21290993A JP 2737100 B2 JP2737100 B2 JP 2737100B2
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- Prior art keywords
- dosimeter
- standard
- irradiation
- dose
- intensity
- Prior art date
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、校正用の標準照射線量
計を用いた線量校正方法に係わり、特に標準照射線量計
の保管中における自然放射線の被曝による測定誤差を低
減し、校正の確度を向上し得る線量校正方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dose calibration method using a standard irradiation dosimeter for calibration, and in particular, to reduce measurement errors due to exposure to natural radiation during storage of the standard irradiation dosimeter and to improve the accuracy of the calibration. The present invention relates to a dose calibration method capable of improving the dose.
【０００２】[0002]
【従来の技術】一般に、照射線量計（蛍光ガラス線量
計）に照射された放射線量を読み取る線量計読取装置
（リーダ）では、校正の際に、アニールによって初期化
された照射線量計に国家標準又は一次標準による標準照
射線量の放射線を照射することにより、標準化した校正
用の標準照射線量計が広く用いられている。2. Description of the Related Art In general, a dosimeter reader (reader) for reading a radiation dose applied to an irradiation dosimeter (fluorescent glass dosimeter) is calibrated by a national standard to an irradiation dosimeter initialized by annealing at the time of calibration. Alternatively, a standard irradiation standard dosimeter for calibration is widely used by irradiating a standard irradiation dose of radiation according to a primary standard.
【０００３】この種の標準照射線量計は、紫外線励起に
より標準照射線量に対応して標準蛍光を発生する機能を
もっている。[0003] This type of standard irradiation dosimeter has a function of generating standard fluorescence in accordance with the standard irradiation dose by ultraviolet excitation.
【０００４】これにより、校正の際に、線量計読取装置
は、標準照射線量計から発生する標準蛍光の強度に基づ
いて照射線量を読取り、この読取結果が前述した標準照
射線量に等しくなるように補正されている。[0004] Thereby, at the time of calibration, the dosimeter reader reads the irradiation dose based on the intensity of the standard fluorescence generated from the standard irradiation dosimeter, and makes the reading result equal to the standard irradiation dose described above. Has been corrected.
【０００５】また、標準照射線量計は、線量計読取装置
の校正が完了すると、次の校正のときまで所定の保管場
所に保管される。When the calibration of the dosimeter reader is completed, the standard irradiation dosimeter is stored in a predetermined storage place until the next calibration.
【０００６】なお、標準照射線量計は、標準化してから
数日が経過すると、保管場所で自然放射線の被曝によっ
て照射線量が増加するため、校正の正確性を低下させて
しまう。このため、標準照射線量計は鉛等によって自然
放射線から遮蔽されながら保管されるが、このような鉛
等によっても自然放射線を遮蔽しきれない問題がある。[0006] In the standard irradiation dosimeter, when several days have passed since the standardization, the irradiation dose increases due to exposure to natural radiation in the storage place, so that the accuracy of calibration is reduced. For this reason, the standard irradiation dosimeter is stored while being shielded from natural radiation by lead or the like, but there is a problem that natural radiation cannot be completely shielded by such lead or the like.
【０００７】よって、通常、線量計読取装置の校正の度
に、標準照射線量計が標準化されている。Therefore, a standard irradiation dosimeter is usually standardized every time the dosimeter reader is calibrated.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、以上の
ような校正では、線量計読取装置を校正する度に、アニ
ール及び標準照射線量の放射線照射を行って標準照射線
量計を標準化するので、校正に手間や時間を要する問題
がある。However, in the above-described calibration, every time the dosimeter reader is calibrated, annealing and irradiation of the standard irradiation dose are performed to standardize the standard irradiation dosimeter. There is a problem that requires time and effort.
【０００９】また、この問題を解決するために、標準照
射線量計の保管場所の１日当りの自然放射線量が既知の
場合、標準照射線量の放射線を照射した日からの経過日
数に基づいて自然放射線量を算出する方式がある。In order to solve this problem, if the natural radiation dose per day at the storage location of the standard irradiation dosimeter is known, the natural radiation dose is calculated based on the number of days elapsed from the irradiation of the standard irradiation dose. There is a method of calculating the amount.
【００１０】しかし、この方式は自然放射線量が日毎で
一定しない場合、正確に自然放射線量を求めることが困
難であり、校正の正確性に欠ける問題がある。However, this method has a problem that when the natural radiation dose is not constant every day, it is difficult to accurately obtain the natural radiation dose, and there is a problem that accuracy of calibration is lacking.
【００１１】本発明は上記実情を考慮してなされたもの
で、校正に要する手間や時間を軽減し、且つ校正の正確
性を向上し得る線量校正方法を提供することを目的とす
る。The present invention has been made in consideration of the above circumstances, and has as its object to provide a dose calibration method capable of reducing the labor and time required for calibration and improving the accuracy of calibration.
【００１２】[0012]
【課題を解決するための手段】上記目的を達成するため
に本発明は、予め標準照射線量の放射線が照射され、紫
外線励起で前記標準照射線量に対応して標準蛍光を発生
する標準照射線量計と、紫外線励起で照射線量計から発
生する蛍光の強度に基づいて照射線量を読取る線量計読
取装置とを備え、前記標準照射線量計から発生する標準
蛍光の強度に基づいて前記線量計読取装置を校正する線
量校正方法において、前記標準照射線量計を保管する際
に、未だ放射線に被曝してない未照射線量計を前記標準
照射線量計の保管場所に設置し、前記未照射線量計が当
該保管中に前記標準照射線量計に照射される自然放射線
を検出し、前記保管を終了すると共に、前記標準照射線
量計及び前記未照射線量計を紫外線励起し、前記標準照
射線量計により前記標準照射線量に対応して発生する蛍
光の強度から前記未照射線量計により前記自然放射線に
対応して発生する蛍光の強度を減算し、この減算結果を
前記標準蛍光の強度とし、この標準蛍光の強度に基づい
て前記標準照射線量を読取るように前記線量計読取装置
を補正する線量校正方法である。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a standard irradiation dosimeter which is irradiated with radiation of a standard irradiation dose in advance and generates standard fluorescence in response to the standard irradiation dose by ultraviolet excitation. And a dosimeter reader for reading the irradiation dose based on the intensity of the fluorescence generated from the irradiation dosimeter by ultraviolet excitation, and the dosimeter reading device based on the intensity of the standard fluorescence generated from the standard irradiation dosimeter. In the dose calibration method for calibrating, when storing the standard irradiation dosimeter, a non-irradiation dosimeter not yet exposed to radiation is installed in the storage location of the standard irradiation dosimeter, and the non-irradiation dosimeter is stored in the storage. While detecting the natural radiation applied to the standard irradiation dosimeter during the storage and ending the storage, the standard irradiation dosimeter and the non-irradiation dosimeter are excited by ultraviolet rays, and The intensity of the fluorescence generated in response to the natural radiation is subtracted from the intensity of the fluorescence generated in accordance with the standard irradiation dose by the unirradiated dosimeter, and the subtraction result is defined as the intensity of the standard fluorescence. A dose calibration method for correcting the dosimeter reader to read the standard irradiation dose based on intensity.
【００１３】[0013]
【作用】従って、本発明は以上のような手段を講じたこ
とにより、標準照射線量計の保管の際に、未照射線量計
が標準照射線量計に照射される自然放射線を検出し、校
正の際に、自然放射線の照射により増加した標準照射線
量計の照射線量から未照射線量計により検出された自然
放射線量を減算し、この減算結果を標準照射線量計の標
準蛍光強度として線量計読取装置を補正するので、校正
の度に標準照射線量計を標準化する必要をなくして校正
に要する手間や時間を軽減し、且つ校正の正確性を向上
させることができる。Therefore, according to the present invention, by taking the above measures, an unirradiated dosimeter detects natural radiation irradiated on the standard irradiation dosimeter when storing the standard irradiation dosimeter, and performs calibration. At this time, the natural radiation dose detected by the non-irradiation dosimeter is subtracted from the irradiation dose of the standard irradiation dosimeter increased by the irradiation of natural radiation, and the subtraction result is used as the standard fluorescence intensity of the standard irradiation dosimeter as a dosimeter reader. Is corrected, it is not necessary to standardize the standard irradiation dosimeter for each calibration, so that the labor and time required for the calibration can be reduced, and the accuracy of the calibration can be improved.
【００１４】[0014]
【実施例】以下、本発明の実施例について図面を参照し
て説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１５】図１は本発明の一実施例に係る標準照射線
量計の保管状態を示す模式図である。FIG. 1 is a schematic view showing a storage state of a standard irradiation dosimeter according to one embodiment of the present invention.
【００１６】図示するように、この標準照射線量計１
は、未照射線量計２に近接して所定の保管場所３内に保
管されている。なお、この保管場所３は自然放射線によ
り被曝している。As shown, this standard irradiation dosimeter 1
Are stored in a predetermined storage location 3 in proximity to the non-irradiated dosimeter 2. The storage location 3 is exposed to natural radiation.
【００１７】ここで、標準照射線量計１は、前述した通
り、紫外線励起により標準照射線量に対応して標準蛍光
を発生するものであって、ここでは銀イオンを用いたリ
ン酸塩ガラスを検出器として有する蛍光ガラス線量計を
使用している。Here, as described above, the standard irradiation dosimeter 1 generates standard fluorescence in accordance with the standard irradiation dose by ultraviolet excitation, and detects a phosphate glass using silver ions. A fluorescent glass dosimeter is used.
【００１８】また、未照射線量計（バックグラウンド線
量計）２は、アニールによって初期化されており、保管
場所３内で標準照射線量計１に照射される自然放射線を
検出する機能をもち、標準照射線量計と同様に蛍光ガラ
ス線量計を用いている。The non-irradiation dosimeter (background dosimeter) 2 has been initialized by annealing, and has a function of detecting natural radiation applied to the standard irradiation dosimeter 1 in the storage place 3. A fluorescent glass dosimeter is used like the irradiation dosimeter.
【００１９】次に、このような標準照射線量計を用いた
線量計読取装置の線量校正方法について説明する。Next, a dose calibration method for a dosimeter reader using such a standard irradiation dosimeter will be described.
【００２０】まず、保管場所３には、標準照射線量計１
と未照射線量計２とを互いに近接して保管する。これに
伴い、標準照射線量計１及び未照射線量計２が互いに等
量だけ自然照射線により照射されることになる。First, the standard irradiation dosimeter 1 is stored in the storage place 3.
And the non-irradiated dosimeter 2 are stored close to each other. Along with this, the standard irradiation dosimeter 1 and the non-irradiation dosimeter 2 are irradiated with natural radiation by an equal amount to each other.
【００２１】ここで、このような標準照射線量計１を用
いて線量計読取装置を校正する。Here, the dosimeter reader is calibrated using such a standard irradiation dosimeter 1.
【００２２】始めに、未照射線量計２を紫外線励起して
自然放射線の照射による蛍光強度を当該線量計読取装置
が読み取る。First, the non-irradiated dosimeter 2 is excited by ultraviolet rays, and the dosimeter reader reads the fluorescence intensity due to the irradiation of natural radiation.
【００２３】次に、等量だけ被曝した標準照射線量計１
を紫外線励起してその蛍光強度を当該線量計読取装置が
読み取る。さらに、このときの標準照射線量計１の蛍光
強度から未照射線量計２の蛍光強度を減算する。Next, the standard irradiation dosimeter 1 exposed to the same amount
And the fluorescence intensity is read by the dosimeter reader. Further, the fluorescence intensity of the non-irradiation dosimeter 2 is subtracted from the fluorescence intensity of the standard irradiation dosimeter 1 at this time.
【００２４】すなわち、標準照射線量計１の蛍光強度
は、図２に示すように、標準照射による蛍光強度と自然
放射線の照射による蛍光強度との合量であることから、
標準照射による蛍光強度は、未照射線量計２の蛍光強度
を減算することによって得られる。That is, as shown in FIG. 2, the fluorescence intensity of the standard irradiation dosimeter 1 is the sum of the fluorescence intensity by the standard irradiation and the fluorescence intensity by the irradiation of the natural radiation.
The fluorescence intensity by the standard irradiation is obtained by subtracting the fluorescence intensity of the non-irradiated dosimeter 2.
【００２５】従って、この標準照射による蛍光強度が標
準照射値を示すように、次の（１）式に示す校正定数を
求めることにより、線量計読取装置を正確に校正する。Therefore, the dosimeter reader is accurately calibrated by obtaining the calibration constant shown in the following equation (1) so that the fluorescence intensity by the standard irradiation indicates the standard irradiation value.
【００２６】 以下、このように校正定数が求められた線量計読取装置
は、次の（２）式に示すように照射線量計の蛍光強度に
当該校正定数を掛けて照射線量値を読み取ることによ
り、正確な測定を実行する。[0026] Hereinafter, the dosimeter reader in which the calibration constants are obtained in this way reads the irradiation dose value by multiplying the fluorescence intensity of the irradiation dosimeter by the calibration constant and reading the irradiation dose value as shown in the following equation (2). Perform the measurement.
【００２７】照射線量値＝ある照射線量計の蛍光強度×
校正定数 …（２） なお、校正作業完了後の標準照射線量計１及び未照射線
量計２は、再度、互いに近接され、次の校正時まで保管
場所に保管される。Irradiation dose value = fluorescence intensity of a certain radiation dosimeter ×
Calibration constant ... (2) Note that the standard irradiation dosimeter 1 and the non-irradiation dosimeter 2 after the completion of the calibration work are again brought close to each other and stored in a storage place until the next calibration.
【００２８】上述したように本実施例によれば、標準照
射線量計１の保管の際に、未照射線量計２が標準照射線
量計１に照射される自然放射線を検出し、校正の際に、
自然放射線の照射により増加した標準照射線量計１の照
射線量から未照射線量計２により検出された自然放射線
量を減算し、この減算結果を標準照射線量計１の標準蛍
光強度として線量計読取装置を補正するようにしたの
で、校正の度に標準照射線量計を標準化する必要をなく
して校正に要する手間や時間を軽減し、且つ日毎に自然
照射線量が変化しても未照射線量計が逐次自然放射線を
検出するので、校正の正確性を向上させることができ
る。As described above, according to the present embodiment, when the standard irradiation dosimeter 1 is stored, the non-irradiation dosimeter 2 detects the natural radiation applied to the standard irradiation dosimeter 1, ,
The natural radiation amount detected by the non-irradiation dosimeter 2 is subtracted from the irradiation amount of the standard irradiation dosimeter 1 increased by the irradiation of the natural radiation, and the subtraction result is used as a standard fluorescence intensity of the standard irradiation dosimeter 1 as a dosimeter reader. Is corrected, eliminating the need to standardize the standard irradiation dosimeter every time calibration is performed, reducing the labor and time required for calibration. Since natural radiation is detected, the accuracy of calibration can be improved.
【００２９】なお、上記実施例では、未照射線量計によ
り自然放射線を検出した場合について説明したが、これ
に限らず、他の測定器により自然放射線を測定して照射
線量計読取装置を校正するようにしても、本発明と同様
の効果を得ることができる。その他、本発明はその要旨
を逸脱しない範囲で種々変形して実施できる。In the above embodiment, the case where the natural radiation is detected by the non-irradiation dosimeter has been described. However, the present invention is not limited to this, and the natural radiation is measured by another measuring device to calibrate the irradiation dosimeter reader. Even if it does so, the same effect as the present invention can be obtained. In addition, the present invention can be implemented with various modifications without departing from the scope of the invention.
【００３０】[0030]
【発明の効果】以上説明したように本発明によれば、標
準照射線量計の保管の際に、未照射線量計が標準照射線
量計に照射される自然放射線を検出し、校正の際に、自
然放射線の照射により増加した標準照射線量計の照射線
量から未照射線量計により検出された自然放射線量を減
算し、この減算結果を標準照射線量計の標準蛍光強度と
して線量計読取装置を補正するようにしたので、校正の
度に標準照射線量計を標準化する必要をなくして校正に
要する手間や時間を軽減し、且つ校正の正確性を向上で
きる線量校正方法を提供できる。As described above, according to the present invention, when the standard irradiation dosimeter is stored, the non-irradiation dosimeter detects the natural radiation applied to the standard irradiation dosimeter, The dose of the natural radiation detected by the non-irradiation dosimeter is subtracted from the irradiation dose of the standard radiation dosimeter increased by the irradiation of the natural radiation, and the result of the subtraction is corrected by the dosimeter reader as the standard fluorescence intensity of the standard radiation dosimeter. Thus, it is not necessary to standardize the standard irradiation dosimeter every time calibration is performed, so that a labor and time required for calibration can be reduced, and a dose calibration method capable of improving the accuracy of calibration can be provided.
【図１】本発明の一実施例に係る標準照射線量計の保管
状態を示す模式図。FIG. 1 is a schematic view showing a storage state of a standard irradiation dosimeter according to one embodiment of the present invention.
【図２】同実施例における作用を説明するための図。FIG. 2 is a view for explaining the operation in the embodiment.
１…標準照射線量計、２…未照射線量計、３…保管場
所。1: Standard irradiation dosimeter, 2: Unirradiated dosimeter, 3: Storage location.
Claims (1)
紫外線励起で前記標準照射線量に対応して標準蛍光を発
生する標準照射線量計と、紫外線励起で照射線量計から
発生する蛍光の強度に基づいて照射線量を読取る線量計
読取装置とを備え、前記標準照射線量計から発生する標
準蛍光の強度に基づいて前記線量計読取装置を校正する
線量校正方法において、 前記標準照射線量計を保管する際に、 未だ放射線に被曝してない未照射線量計を前記標準照射
線量計の保管場所に設置し、 前記未照射線量計が当該保管中に前記標準照射線量計に
照射される自然放射線を検出し、 前記保管を終了すると共に、前記標準照射線量計及び前
記未照射線量計を紫外線励起し、 前記標準照射線量計により前記標準照射線量に対応して
発生する蛍光の強度から前記未照射線量計により前記自
然放射線に対応して発生する蛍光の強度を減算し、 この減算結果を前記標準蛍光の強度とし、 この標準蛍光の強度に基づいて前記標準照射線量を読取
るように前記線量計読取装置を補正することを特徴とす
る線量校正方法。1. A standard irradiation dose of radiation is applied in advance,
A standard irradiation dosimeter that generates standard fluorescence corresponding to the standard irradiation dose by ultraviolet excitation, and a dosimeter reading device that reads an irradiation dose based on the intensity of fluorescence generated from the irradiation dosimeter by ultraviolet excitation, In the dose calibration method for calibrating the dosimeter reader based on the intensity of the standard fluorescence generated from the standard irradiation dosimeter, when storing the standard irradiation dosimeter, an unirradiated dosimeter not yet exposed to radiation is used. Installed in the storage location of the standard irradiation dosimeter, the non-irradiation dosimeter detects natural radiation irradiated to the standard irradiation dosimeter during the storage, and ends the storage, the standard irradiation dosimeter and The unirradiated dosimeter is excited by ultraviolet light, and the unirradiated dosimeter emits light corresponding to the natural radiation based on the intensity of the fluorescence generated corresponding to the standard irradiation dose by the standard irradiation dosimeter. Subtracting the intensity of the fluorescence to be performed, setting the subtraction result as the intensity of the standard fluorescence, and correcting the dosimeter reader to read the standard irradiation dose based on the intensity of the standard fluorescence. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21290993A JP2737100B2 (en) | 1993-08-27 | 1993-08-27 | Dose calibration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21290993A JP2737100B2 (en) | 1993-08-27 | 1993-08-27 | Dose calibration method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0763858A JPH0763858A (en) | 1995-03-10 |
| JP2737100B2 true JP2737100B2 (en) | 1998-04-08 |
Family
ID=16630293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21290993A Expired - Fee Related JP2737100B2 (en) | 1993-08-27 | 1993-08-27 | Dose calibration method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2737100B2 (en) |
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1993
- 1993-08-27 JP JP21290993A patent/JP2737100B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0763858A (en) | 1995-03-10 |
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