JP2815529B2 - Fluorescent glass dosimeter - Google Patents
Fluorescent glass dosimeterInfo
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- JP2815529B2 JP2815529B2 JP5244203A JP24420393A JP2815529B2 JP 2815529 B2 JP2815529 B2 JP 2815529B2 JP 5244203 A JP5244203 A JP 5244203A JP 24420393 A JP24420393 A JP 24420393A JP 2815529 B2 JP2815529 B2 JP 2815529B2
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- rays
- fluorescent glass
- energy
- glass element
- ray
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、原子力発電所その他の
原子力施設等に従事する作業者また所要とする個所の放
射線被ばく線量を測定する蛍光ガラス線量計に係わり、
特に高エネルギーγ線，Ｘ線およびβ線等の放射線量を
高精度に分離測定する蛍光ガラス線量計に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent glass dosimeter for measuring the radiation exposure dose of a worker engaged in a nuclear power plant or other nuclear facilities, or a required location.
More particularly, the present invention relates to a fluorescent glass dosimeter that separates and measures radiation doses of high energy γ-rays, X-rays, and β-rays with high accuracy.
【０００２】[0002]
【従来の技術】一般に、蛍光ガラス線量計は、銀イオン
を含有するリン酸塩ガラスからなる蛍光ガラス素子が用
いられている。この蛍光ガラス素子は、放射線の照射に
よって活性化された後、ある波長例えば３００〜４００
nmの紫外線励起によって蛍光を発するが、このとき発生
する蛍光量が放射線量に比例することから、当該蛍光量
を検出することにより、蛍光ガラス素子の被ばく放射線
量を測定することができる。2. Description of the Related Art Generally, a fluorescent glass dosimeter uses a fluorescent glass element made of phosphate glass containing silver ions. After being activated by irradiation with radiation, the fluorescent glass element has a certain wavelength, for example, 300 to 400.
Fluorescence is emitted by excitation of ultraviolet light of nm, and the amount of fluorescence generated at this time is proportional to the amount of radiation. Therefore, by detecting the amount of fluorescence, the amount of exposure radiation of the fluorescent glass element can be measured.
【０００３】ところで、蛍光ガラス素子に、あるエネル
ギーのγ線或いはＸ線を照射したとき、そのエネルギー
領域によっては、当該蛍光量の検出感度に過剰応答性を
示す場合がある。When a fluorescent glass element is irradiated with γ-rays or X-rays of a certain energy, depending on the energy region, the sensitivity of detecting the amount of the fluorescent light may exhibit an excessive response.
【０００４】そこで、現在の蛍光ガラス線量計では、蛍
光ガラス素子と対面する方向にγ線およびＸ線の各エネ
ルギーを補償するエネルギー補償用フィルタが配置さ
れ、当該γ線およびＸ線がエネルギー補償用フィルタを
通して蛍光ガラス素子に照射される構成となっている。Therefore, in the present fluorescent glass dosimeter, an energy compensating filter for compensating each energy of γ-rays and X-rays is arranged in a direction facing the fluorescent glass element, and the γ-rays and X-rays are used for energy compensation. It is configured to irradiate the fluorescent glass element through the filter.
【０００５】[0005]
【発明が解決しようとする課題】従って、以上のような
蛍光ガラス線量計では、蛍光ガラス素子の対面方向にエ
ネルギー補償用フィルタを配置してγ線，Ｘ線を測定し
ているが、例えば３ＭｅＶ以上の高エネルギーγ線が照
射されたとき、エネルギー補償用フィルタと高エネルギ
ーγ線との相互作用により２次電子が発生し、それに伴
って蛍光ガラス素子が過剰応答性を示し、エネルギーの
依存性が生じてしまう。すなわち、３ＭｅＶ以上の高エ
ネルギーγ線に対し、蛍光ガラス素子が過剰応答性を示
し、多くの蛍光量を発生するので、高精度な測定が困難
となる。Therefore, in such a fluorescent glass dosimeter as described above, a gamma ray and an X-ray are measured by disposing an energy compensating filter in a direction opposite to the fluorescent glass element. When the high-energy γ-rays are irradiated, secondary electrons are generated due to the interaction between the energy-compensating filter and the high-energy γ-rays, and the fluorescent glass element exhibits an over-response with the interaction. Will occur. That is, the fluorescent glass element exhibits an excessive response to high energy γ-rays of 3 MeV or more and generates a large amount of fluorescent light, so that it is difficult to perform highly accurate measurement.
【０００６】また、β線量を測定する場合、γ線・Ｘ線
のエネルギー依存性が良好であることが重要であり、前
述のごとく３ＭｅＶ以上の高エネルギーγ線の照射によ
るγ線・Ｘ線の高精度測定が難しいことから、β線量の
高精度な分離測定が困難であること。[0006] When measuring the dose of β, it is important that the energy dependence of γ-rays and X-rays is good. As described above, the irradiation of γ-rays and X-rays by irradiation of high-energy γ-rays of 3 MeV or more is performed as described above. Difficulty in high-precision measurement, so high-precision separation measurement of β-dose is difficult.
【０００７】さらに、近年、原子力発電所の原子炉施設
等の普及に伴い、かかる施設内で被ばくの可能性のある
３ＭｅＶ以上の高エネルギーγ線およびβ線の被ばく線
量を適切に評価測定することが重要な関心事となってい
るが、それに対する対応ができていない。Further, in recent years, with the spread of nuclear reactor facilities in nuclear power plants, it is necessary to appropriately evaluate and measure exposure doses of high-energy γ-rays and β-rays of 3 MeV or more that may be exposed in such facilities. Has become an important concern, but has not been able to respond to it.
【０００８】本発明は上記実情に鑑みてなされたもの
で、高エネルギーγ線，Ｘ線およびβ線の各放射線量を
高精度に分離測定可能とする蛍光ガラス線量計を提供す
ることを目的とする。The present invention has been made in view of the above circumstances, and has as its object to provide a fluorescent glass dosimeter capable of separating and measuring high-energy γ-rays, X-rays, and β-rays with high accuracy. I do.
【０００９】[0009]
【課題を解決するための手段】上記課題を解決するため
に、請求項１に対応する発明は、放射線の照射によって
活性化され、かつ、紫外線の励起によって蛍光を発する
一体または別体の蛍光ガラス素子本体を用いて所望のγ
線，Ｘ線およびβ線を分離測定する蛍光ガラス線量計に
おいて、前記一体の蛍光ガラス素子本体の２個所または
前記別体の２つの蛍光ガラス素子本体と対面する位置に
配置され、γ線およびＸ線のエネルギー補償を行うエネ
ルギー補償用フィルタと、前記蛍光ガラス素子本体と前
記γ線およびＸ線のうち少なくとも何れか一方の前記エ
ネルギー補償用フィルタとの間に配設され、３ＭｅＶ以
上の高エネルギーγ線の照射によって前記エネルギー補
償用フィルタから発生する２次電子を吸収して前記蛍光
ガラス素子本体の過剰応答を抑える２次電子吸収材と、
前記一体の蛍光ガラス素子本体の別の２個所または前記
別体のさらに２つの蛍光ガラス素子本体の両面または片
面に対面する位置に前記β線を分離測定可能に設けられ
た３〜５０mg／cm2 の樹脂フィルタが張設された窓部と
を設けた蛍光ガラス線量計である。In order to solve the above-mentioned problems, an invention according to claim 1 is an integrated or separate fluorescent glass which is activated by irradiation of radiation and emits fluorescence by excitation of ultraviolet rays. Using the element body, the desired γ
In a fluorescent glass dosimeter for separately measuring X-rays, X-rays and β-rays, the fluorescent glass dosimeter is disposed at two places of the integrated fluorescent glass element main body or at a position facing the two separate fluorescent glass element main bodies, An energy compensating filter for compensating energy of X-rays, and a high energy γ of 3 MeV or more, which is disposed between the fluorescent glass element body and the energy compensating filter of at least one of the γ-ray and the X-ray. The secondary electrons generated from the energy compensating filter by the irradiation of the X-rays are absorbed to generate the fluorescent light .
A secondary electron absorber that suppresses excessive response of the glass element body ,
The β-ray is provided so as to be able to be separated and measured at another two locations of the integrated fluorescent glass element main body or at a position facing both surfaces or one surface of the two separate fluorescent glass element main bodies.
And a window in which a resin filter of 3 to 50 mg / cm 2 is stretched.
【００１０】[0010]
【作用】従って、請求項１に対応する発明は以上のよう
な手段を講じたことにより、蛍光ガラス素子本体とエネ
ルギー補償用フィルタとの間に２次電子吸収材を配置す
ることにより、３ＭｅＶ以上の高エネルギーγ線が照射
されたとき、前記エネルギー補償用フィルタから２次電
子が発生し過剰応答性を示すが、このエネルギー補償用
フィルタから発生する２次電子を２次電子吸収材で吸収
して過剰応答性を抑えるので、３ＭｅＶ以上の高エネル
ギーγ線およびＸ線の各放射線量を高精度に分離測定で
きる。また、同一の蛍光ガラス素子本体の別の２個所ま
たは独立した２つの蛍光ガラス素子本体と対面する位置
に３〜５０mg／cmの樹脂フィルタの窓部を設けたことに
より、前記分離測定されたγ線，Ｘ線の蛍光検出量とこ
の樹脂フィルタに対応する蛍光ガラス素子本体からの蛍
光検出量とに基づき、或いはβ線に対して異なる感度特
性の樹脂フィルタを設けたときにはこれら両者の感度比
に基づき、β線を高精度に分離測定できる。Therefore, the invention corresponding to claim 1 takes the above-mentioned means, and by arranging a secondary electron absorbing material between the fluorescent glass element main body and the energy compensating filter, 3 MeV or more can be obtained. When high energy γ-rays are irradiated, secondary electrons are generated from the energy compensating filter and exhibit an excessive response. The secondary electrons generated from the energy compensating filter are absorbed by the secondary electron absorbing material.
As a result, the excess responsiveness is suppressed, so that the radiation doses of high energy γ-rays and X-rays of 3 MeV or more can be separated and measured with high accuracy. In addition, a window portion of a resin filter of 3 to 50 mg / cm is provided at another position of the same fluorescent glass element body or at a position facing two independent fluorescent glass element bodies.
From the above , the fluorescence detection amounts of γ-rays and X-rays separated and measured
From the fluorescent glass element body corresponding to the resin filter of
Different sensitivity characteristics based on the amount of light detected or for β-rays
-Out group Dzu the sensitivity ratio of both of which when provided sexual resin filter can be separated measure β-rays with high accuracy.
【００１１】[0011]
【実施例】以下、本発明に係わる蛍光ガラス線量計の一
実施例について図１および図２を参照して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a fluorescent glass dosimeter according to the present invention will be described below with reference to FIGS.
【００１２】図１は蛍光ガラス素子本体および蛍光ガラ
ス素子本体を支持する支持枠体の関係を示す図、図２は
蛍光ガラス素子本体を保持した支持枠体を収納するフィ
ルタケースを示す図である。FIG. 1 is a view showing the relationship between a fluorescent glass element body and a support frame supporting the fluorescent glass element body, and FIG. 2 is a view showing a filter case for housing the support frame holding the fluorescent glass element body. .
【００１３】蛍光ガラス素子１０においては、銀イオン
を含有するリン酸塩ガラスなどからなり、例えば４個の
ガラス素子本体（図示せず）または図１に示すような例
えば４個のガラス素子本体に相当する長さを有する蛍光
ガラス素子本体１１と、このガラス素子本体１１を支持
する１組の支持枠体１２，１３とによって構成されてい
る。The fluorescent glass element 10 is made of, for example, phosphate glass containing silver ions, and is formed into, for example, four glass element bodies (not shown) or, for example, four glass element bodies as shown in FIG. It is composed of a fluorescent glass element body 11 having a corresponding length, and a pair of support frames 12 and 13 for supporting the glass element body 11.
【００１４】この支持枠体１２は、４個の開口部１４ａ
〜１４ｄが形成され、さらにガラス素子本体１１の蛍光
発生光路となる部分を除いて枠体周縁部から垂直方向に
素子保持用突起１５，…が設けられ、図示矢印方向から
嵌め込まれるガラス素子本体１１を素子保持用突起１
５，…で保持する構成となっている。The support frame 12 has four openings 14a.
.. 14d are formed, and element holding projections 15,... Are provided vertically from the peripheral edge of the frame body except for the part that becomes the fluorescence generating optical path of the glass element body 11, and the glass element body 11 fitted in the direction of the arrow shown in the figure. To the element holding projection 1
.. Are held.
【００１５】他方の支持枠体１３は、ガラス素子本体１
１を保持する一方の支持枠体１２を収納保持する役割を
有し、具体的には前記支持体１２と同様に複数の開口部
１６ａ〜１６ｄが形成され、当該枠体１３の幅方向両端
部を同一方向に折り曲げてコ字状部１７に形成し、さら
に前記開口部１６ａ〜１６ｄと対応する位置関係をもっ
て各コ字状部１７の両部にもそれぞれ切欠部１８ａ〜１
８ｄが設けられている。また、支持枠体１３の一端部に
は例えば蛍光ガラス素子１０の識別番号を光学的に読み
取るための孔部を形成したガラス素子識別番号部１９が
設けられている。The other support frame 13 is used to hold the glass element body 1
1 has a role of storing and holding one of the support frames 12, and more specifically, a plurality of openings 16a to 16d are formed similarly to the support 12, and both ends in the width direction of the frame 13 Are bent in the same direction to form the U-shaped portions 17, and the notches 18a to 1 are also provided on both sides of each of the U-shaped portions 17 in a positional relationship corresponding to the openings 16a to 16d.
8d are provided. Further, at one end of the support frame 13, for example, a glass element identification number portion 19 having a hole for optically reading the identification number of the fluorescent glass element 10 is provided.
【００１６】そして、以上のように蛍光ガラス素子本体
１１を一組の支持枠体１２，１３で支持してなる図２に
示す蛍光ガラス素子１０は、放射線作業従事者や利用者
などが携行可能なようにカプセル２０に収納される。The fluorescent glass element 10 shown in FIG. 2 in which the fluorescent glass element main body 11 is supported by the pair of support frames 12 and 13 as described above can be carried by radiation workers and users. How it is stored in the capsule 20.
【００１７】この蛍光ガラス素子１０の収納後、このカ
プセル２０には、支持枠体１３の開口部１６ａに対面す
る位置となる例えば内壁部分にγ線・Ｘ線エネルギー補
償フィルタ２１と３ＭｅＶ以上の高エネルギーγ線によ
ってフィルタ２１から発生する２次電子を吸収し、か
つ、自身から２次電子を出さない物質（以下、２次電子
吸収材と呼ぶ）２２とが積層配設されている。なお、２
次電子吸収材２２は単層或いは２層以上の積層構造でも
よい。After the fluorescent glass element 10 is stored, the capsule 20 has a γ-ray / X-ray energy compensating filter 21 at a position facing the opening 16 a of the support frame 13, for example, at an inner wall, and a high energy of 3 MeV or more. A substance (hereinafter, referred to as a secondary electron absorbing material) 22 that absorbs secondary electrons generated from the filter 21 by energy γ-rays and does not emit secondary electrons from itself is laminated and disposed. In addition, 2
The secondary electron absorbing material 22 may have a single layer or a laminated structure of two or more layers.
【００１８】また、支持枠体１３の開口部１６ｂと対面
するカプセル２０の該当部分にはγ線・Ｘ線エルネギー
補償フィルタ２３が配設されている。なお、このγ線・
Ｘ線エルネギー補償フィルタ２３には前記２次電子吸収
材に相当するものを積層してもよく、或いは積層しなく
てもよい。A γ-ray / X-ray energy compensating filter 23 is provided at a corresponding portion of the capsule 20 facing the opening 16 b of the support frame 13. In addition, this γ-ray
The X-ray energy compensating filter 23 may or may not have a layer corresponding to the secondary electron absorbing material.
【００１９】さらに、支持枠体１３の開口部１６ｃ，１
６ｄと対面するカプセル２０の該当部分にはそれぞれ開
口部が設けられ、この開口部分には３〜５０mg／cm2 の
樹脂フィルタを張設したβ線検出用窓２４，２５が設け
られている。つまり、一方の窓２４（または２５）には
β線エネルギーに対してほぼ均一の感度特性を示す樹脂
フィルタを張り付け、他方の窓２５（または２４）には
β線エネルギーに対して変化する感度特性を示す樹脂フ
ィルタを張り付け、これら両者の感度比を利用してβ線
を求めるものである（特開昭６４−８６０８７号公報参
照）。Further, the openings 16c, 1 of the support frame 13 are provided.
Openings are respectively provided in corresponding portions of the capsule 20 facing 6d, and β-ray detection windows 24 and 25 provided with resin filters of 3 to 50 mg / cm 2 are provided in these openings. That is, a resin filter exhibiting a substantially uniform sensitivity characteristic with respect to β-ray energy is attached to one window 24 (or 25), and a sensitivity characteristic varying with respect to β-ray energy is applied to the other window 25 (or 24). A β-ray is obtained by utilizing the sensitivity ratio of the two (see JP-A-64-86087).
【００２０】なお、検出用フィルタや検出用窓を設ける
ことおよびその数は何れの放射線を検出測定するかで決
定される。The provision of the detection filter and the detection window and the number thereof are determined by which radiation is to be detected and measured.
【００２１】次に、本発明に係わる線量計と従来の線量
計とを比較し、その違いを説明する。カプセル２０の該
当部分にエネルギー補償用フィルタ２１として鉛Ｐｂ，
錫Ｓｎおよび銅Ｃｕフィルタを設け、また２次電子吸収
材２２としてプラスチックＰｌ，アルミニウムＡｌを設
け、これを３ＭｅＶ以上の高エネルギーγ線，例えば16
Ｎ−γ線（６．１ＭｅＶ）と、基準とするγ線，例えば
137 Ｃｓ−γ線（０．６６ＭｅＶ）とをそれぞれ照射
し、これら両照射による蛍光ガラス素子１０から得られ
る蛍光検出量の比を求めると、図３のような結果が得ら
れる。Next, the difference between the dosimeter according to the present invention and the conventional dosimeter will be described, and the difference will be described. Lead Pb as an energy compensating filter 21
Tin Sn and copper Cu filter is provided, also plastic Pl as a secondary electron absorbing material 22, aluminum Al is provided, which 3MeV more high-energy γ rays, for example, 16
N-γ rays (6.1 MeV) and a reference γ ray, for example,
Irradiation with 137 Cs-γ rays (0.66 MeV) was performed, and the ratio of the amount of fluorescence detected from the fluorescent glass element 10 by the two irradiations was determined. The result shown in FIG. 3 was obtained.
【００２２】この図３は、実際の測定状態を模擬してフ
ァントム上に蛍光ガラス線量計を設置した後、16Ｎ−γ
線および137 Ｃｓ−γ線を同じ線量だけ照射し、16Ｎ−
γ線に対応する蛍光検出量と137 Ｃｓ−γ線に対応する
蛍光検出量の比，つまり蛍光検出量比を示す図である。FIG. 3 shows a state in which a fluorescent glass dosimeter is set on a phantom to simulate an actual measurement state, and then the 16 N-γ
And 137 Cs-γ-rays at the same dose, 16 N-
Fluorescence detection of the ratio corresponding to the fluorescence detection amount and the 137 Cs-gamma rays corresponding to gamma rays, that is a diagram illustrating a fluorescence detection amount ratio.
【００２３】この図３から明らかなように、サンプルＮ
Ｏ．１〜ＮＯ．３のようなエネルギー補償用フィルタの
みの従来の線量計の場合、エネルギー補償用フィルタと
高エネルギーγ線との相互作用によって２次電子が発生
し、蛍光ガラス素子１０からの蛍光検出量が増大し、測
定精度の低下を招く問題がある。As apparent from FIG. 3, the sample N
O. 1 to NO. In the case of the conventional dosimeter having only the energy compensating filter as in No. 3, secondary electrons are generated due to the interaction between the energy compensating filter and the high-energy γ-rays, and the amount of fluorescence detected from the fluorescent glass element 10 increases. However, there is a problem that the measurement accuracy is reduced.
【００２４】これに対し、エネルギー補償用フィルタ２
１と蛍光ガラス素子１０との間に２次電子吸収材２２を
配設した蛍光ガラス素子の場合は、特にサンプルＮＯ．
６，ＮＯ．９およびＮＯ．１３に示すように、蛍光ガラ
ス素子１０の蛍光検出量比が小さいことから、基準γ線
（137 Ｃｓ−γ線）に対して蛍光検出量の差がなくな
り、高い測定精度が得られていることが分かる。On the other hand, the energy compensating filter 2
In the case of a fluorescent glass element in which the secondary electron absorbing material 22 is disposed between the fluorescent glass element 10 and the fluorescent glass element 10, the sample NO.
6, NO. 9 and NO. As shown in FIG. 13, since the fluorescence detection ratio of the fluorescent glass element 10 is small, there is no difference in the fluorescence detection amount with respect to the reference γ-ray ( 137 Cs-γ-ray), and high measurement accuracy is obtained I understand.
【００２５】なお、以上の実施例では、エネルギー補償
用フィルタとして鉛Ｐｂ，錫Ｓｎおよび銅Ｃｕの何れ
か、或いはこれらの組合わせを使用し、また２次電子吸
収材２２としてプラスチックＰｌ，アルミニウムＡｌの
何れか、或いはこれらの組合わせを上げたが、これらの
材質，厚さおよび配置方法は設計段階で適宜決定される
ものである。要は、本目的である例えば３ＭｅＶ以上の
高エネルギーγ線と、基準γ線（137 Ｃｓ−γ線）の蛍
光検出量の差がないものであればよい。In the above embodiment, any one of lead Pb, tin Sn and copper Cu or a combination thereof is used as an energy compensating filter, and plastic Pl and aluminum Al are used as the secondary electron absorbing material 22. Or any combination thereof, but the material, thickness, and arrangement method thereof are appropriately determined at the design stage. In short, it is sufficient that there is no difference between the amount of fluorescence detection of the high-energy γ-ray of 3 MeV or more, which is the object of the present invention, and the reference γ-ray ( 137 Cs-γ-ray).
【００２６】次に、β線の検出方法は、先ず、混在する
γ線，Ｘ線を前述するフィルタ２１，２３に対応する蛍
光ガラス素子本体１１の蛍光検出量から求めた後、β線
検出用窓２４，２５に位置する蛍光ガラス素子本体１１
からの蛍光検出量から先に求めた蛍光検出量を差し引く
ことにより検出する。Next, the method of detecting β-rays is as follows. First, mixed γ-rays and X-rays are obtained from the amount of fluorescence detected by the fluorescent glass element body 11 corresponding to the filters 21 and 23 described above. Fluorescent glass element body 11 located at windows 24 and 25
Is detected by subtracting the previously detected fluorescence detection amount from the fluorescence detection amount from
【００２７】そして、前述したように一方の窓２４（ま
たは２５）側には図４の曲線Ａに示すようなβ線エネル
ギーに対してほぼ均一の感度特性を示す樹脂フィルタを
張り付け、他方の窓２５（または２４）側には図４の曲
線Ｂに示すような感度特性を有する樹脂フィルタを張り
付ければ、これら両者の感度比によってβ線エネルギー
を求めることができる。つまり、このβ線エネルギーに
対する蛍光ガラス素子本体１１の感度からβ線を求める
ことが可能である。As described above, a resin filter exhibiting substantially uniform sensitivity characteristics to β-ray energy as shown by a curve A in FIG. 4 is attached to one window 24 (or 25) side, and the other window 24 (or 25). If a resin filter having a sensitivity characteristic as shown by the curve B in FIG. 4 is attached to the 25 (or 24) side, the β-ray energy can be obtained from the sensitivity ratio of these two. That is, β-rays can be obtained from the sensitivity of the fluorescent glass element body 11 to the β-ray energy.
【００２８】ところで、蛍光ガラス線量計においては、
３ＭｅＶ以上の高エネルギーγ線の線量測定精度だけが
良好であっても、それ以下のエネルギー域のγ線・Ｘ線
の線量測定精度が良好でなければ、β線の線量測定精度
が良好でなくなることは言うまでもない。By the way, in a fluorescent glass dosimeter,
Even if only the dose measurement accuracy of high-energy γ-rays of 3 MeV or more is good, the dose measurement accuracy of β-rays will not be good unless the dose measurement accuracy of γ-rays and X-rays in the lower energy range is good. Needless to say.
【００２９】そこで、３ＭｅＶ以上の高エネルギーγ線
に対応したエネルギー補償用フィルタ２１と２次電子吸
収材２２とを組合わせた蛍光ガラス線量計を用いて、３
ＭｅＶ以下のエネルギー域におけるγ線・Ｘ線の蛍光検
出量と、基準γ線（137 Ｃｓ−γ線）の蛍光検出量との
比が小さいものを調べたところ、図３のサンプルＮＯ．
１３の組合わせのフィルタのとき、３２ｋｅＶ〜16Ｎ
（６．１ＭｅＶ）のγ線・Ｘ線エネルギー域におけるγ
線・Ｘ線の蛍光検出量と、基準γ線（137 Ｃｓ−γ線）
の蛍光検出量との比が±１０％以内となり、良好である
ことが確認される。従って、これによってβ線の線量測
定精度も良好な結果が得られる。Then, using a fluorescent glass dosimeter in which an energy compensating filter 21 and a secondary electron absorbing material 22 corresponding to a high energy γ-ray of 3 MeV or more are combined, a fluorescent glass dosimeter is used.
When the ratio of the fluorescence detection amount of γ-rays and X-rays in the energy range of MeV or lower to the fluorescence detection amount of the reference γ-ray ( 137 Cs-γ-ray) was small, the sample NO.
For a combination of 13 filters, 32 keV to 16 N
Γ in the (6.1 MeV) γ-ray / X-ray energy range
X-ray fluorescence detection amount and reference γ-ray ( 137 Cs-γ-ray)
Is within ± 10%, confirming that it is good. Accordingly, this also provides a result with good β-ray dose measurement accuracy.
【００３０】なお、上記実施例では、γ線・Ｘ線および
β線の各放射線量の測定に適用したが、それ以外の放射
線の線量測定を含むものであってもよい。In the above embodiment, the present invention is applied to the measurement of each radiation dose of γ-rays, X-rays, and β-rays.
【００３１】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 addition, the present invention can be variously modified and implemented without departing from the gist thereof.
【００３２】[0032]
【発明の効果】以上説明したように本発明によれば、少
くとも一個のエネルギー補償用フィルタと蛍光ガラス素
子本体との間に、３ＭｅＶ以上の高エネルギーγ線に起
因する前記エネルギー補償用フィルタから発生する２次
電子を吸収し、かつ、自身で２次電子を放出しない２次
電子吸収材を単層または複層にわたって配設し、さらに
同一の蛍光ガラス素子本体の別の２個所または独立した
２つの蛍光ガラス素子本体と対面する位置に３〜５０mg
／cm2 の樹脂フィルタの窓部を張設したことにより、高
エネルギーγ線，Ｘ線およびβの各放射線量を同時に高
精度に分離測定することができる。As described above, according to the present invention, between at least one energy compensating filter and the fluorescent glass element main body, the energy compensating filter caused by high energy γ-rays of 3 MeV or more is used. A secondary electron absorbing material that absorbs generated secondary electrons and does not emit secondary electrons by itself is disposed over a single layer or a plurality of layers. 3-50mg at the position facing two fluorescent glass elements
Since the resin filter window of / cm 2 is stretched, high-energy γ-rays, X-rays, and β radiation doses can be simultaneously separated and measured with high accuracy.
【図１】本発明に係わる蛍光ガラス線量計のうち、蛍光
ガラス素子本体と支持枠体との関係を示す分解斜視図。FIG. 1 is an exploded perspective view showing a relationship between a fluorescent glass element main body and a support frame in a fluorescent glass dosimeter according to the present invention.
【図２】蛍光ガラス素子を収納するフィルターケースの
外観図。FIG. 2 is an external view of a filter case accommodating a fluorescent glass element.
【図３】２次電子吸収材の有無における蛍光検出量比を
示す図。FIG. 3 is a diagram showing a fluorescence detection amount ratio with and without a secondary electron absorbing material.
【図４】各樹脂フィルタの厚さを変えたときの蛍光ガラ
ス素子本体のβ線エネルギーに対する感度特性を示す曲
線図。FIG. 4 is a curve diagram showing sensitivity characteristics of the fluorescent glass element body to β-ray energy when the thickness of each resin filter is changed.
１０…蛍光ガラス素子、１１…蛍光ガラス素子本体、１
２，１３…支持枠体、１４ａ〜１４ｄ，１６ａ〜１６ｄ
…開口部、２０…カプセル、２１…γ線・Ｘ線エネルギ
ー補償用フィルタ、２２…２次電子吸収材、２３…γ線
・Ｘ線エネルギー補償用フィルタ、２４，２５…β線検
出用窓。10: fluorescent glass element, 11: fluorescent glass element body, 1
2, 13 ... support frame, 14a to 14d, 16a to 16d
... Opening, 20 capsule, 21 γ-ray / X-ray energy compensation filter, 22 secondary electron absorber, 23 γ-ray / X-ray energy compensation filter, 24, 25 β-ray detection window.
Claims (1)
つ、紫外線の励起によって蛍光を発する一体または別体
の蛍光ガラス素子本体を用いて所望のγ線，Ｘ線および
β線を分離測定する蛍光ガラス線量計において、 前記一体の蛍光ガラス素子本体の２個所または前記別体
の２つの蛍光ガラス素子本体と対面する位置に配置さ
れ、γ線およびＸ線のエネルギー補償を行うエネルギー
補償用フィルタと、 前記蛍光ガラス素子本体と前記γ線およびＸ線のうち少
なくとも何れか一方の前記エネルギー補償用フィルタと
の間に配設され、３ＭｅＶ以上の高エネルギーγ線の照
射によって前記エネルギー補償用フィルタから発生する
２次電子を吸収して前記蛍光ガラス素子本体の過剰応答
を抑える２次電子吸収材と、 前記一体の蛍光ガラス素子本体の別の２個所または前記
別体のさらに２つの蛍光ガラス素子本体の両面または片
面に対面する位置に前記β線を分離測定可能に設けられ
た３〜５０mg／cm2 の樹脂フィルタが張設された窓部
と、 を備えたことを特徴とする蛍光ガラス線量計。1. A fluorescent glass which is activated by irradiation of radiation and separates and measures desired γ-rays, X-rays and β-rays using an integrated or separate fluorescent glass element body which emits fluorescence by excitation of ultraviolet rays. In the dosimeter, an energy compensating filter arranged at two locations of the integrated fluorescent glass element main body or at a position facing the two separate fluorescent glass element main bodies and performing energy compensation of γ-rays and X-rays, The fluorescent glass element body and a small amount of the γ-rays and X-rays
At least one of the energy-compensating filters, and absorbs secondary electrons generated from the energy-compensating filter by irradiation of high-energy γ-rays of 3 MeV or more to absorb the secondary electrons . Excessive response
A secondary electron absorbing material, and the β ray can be separated and measured at another two places of the integrated fluorescent glass element main body or at a position facing both surfaces or one surface of two separate fluorescent glass element main bodies. Provided
3. A fluorescent glass dosimeter, comprising: a window on which a resin filter of 3 to 50 mg / cm 2 is stretched.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5244203A JP2815529B2 (en) | 1993-09-30 | 1993-09-30 | Fluorescent glass dosimeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5244203A JP2815529B2 (en) | 1993-09-30 | 1993-09-30 | Fluorescent glass dosimeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0798382A JPH0798382A (en) | 1995-04-11 |
| JP2815529B2 true JP2815529B2 (en) | 1998-10-27 |
Family
ID=17115308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5244203A Expired - Fee Related JP2815529B2 (en) | 1993-09-30 | 1993-09-30 | Fluorescent glass dosimeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2815529B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5095254B2 (en) * | 2007-04-06 | 2012-12-12 | 株式会社千代田テクノル | Multilayer radiation measuring instrument |
| WO2017177338A1 (en) | 2016-04-13 | 2017-10-19 | Dalhousie University | Tissue-equivalent dosimeter |
| CN108152853A (en) * | 2018-03-08 | 2018-06-12 | 北京聚合信机电有限公司 | Counting tube energy compensation system |
| JP2021128114A (en) * | 2020-02-17 | 2021-09-02 | 日本電気硝子株式会社 | Glass dosemeter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6486087A (en) * | 1986-06-09 | 1989-03-30 | Toshiba Glass Kk | Fluorescent glass dosemeter composite element |
| JPS6415921A (en) * | 1987-07-09 | 1989-01-19 | Sharp Kk | X-ray exposure method |
-
1993
- 1993-09-30 JP JP5244203A patent/JP2815529B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0798382A (en) | 1995-04-11 |
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