JPH0562709B2 - - Google Patents
Info
- Publication number
- JPH0562709B2 JPH0562709B2 JP60041911A JP4191185A JPH0562709B2 JP H0562709 B2 JPH0562709 B2 JP H0562709B2 JP 60041911 A JP60041911 A JP 60041911A JP 4191185 A JP4191185 A JP 4191185A JP H0562709 B2 JPH0562709 B2 JP H0562709B2
- Authority
- JP
- Japan
- Prior art keywords
- scintillator
- detection surface
- light
- thickness
- scintillation detector
- 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
- 238000001514 detection method Methods 0.000 claims description 39
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000005855 radiation Effects 0.000 description 8
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Measurement Of Radiation (AREA)
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、放射線を検出するシンチレーシヨン
検出器に係り、特にシンチレータの構成の改良に
関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a scintillation detector for detecting radiation, and particularly to an improvement in the structure of a scintillator.
シンチレーシヨン検出器は、第５図に示すよう
に、遮光膜１、シンチレータ２、光ガイド３、ケ
ース４、フオトマル５ａ，５ｂにより構成され
る。放射線が入射し、その失うエネルギーで発光
作用を行なうシンチレータ２は、従来では、検出
面に対して板状で均一な厚さの構造を採用してい
た。したがつて、フオトマル５ａ，５ｂに近接し
たところで発光した光は、フオトマルに近いた
め、光の伝達効率が高く且つ検出器中心部である
ため、放射線に対する幾何学的効率が高く、第６
図に示す検出効率分布特性を示す。
As shown in FIG. 5, the scintillation detector is composed of a light-shielding film 1, a scintillator 2, a light guide 3, a case 4, and photoprints 5a and 5b. Conventionally, the scintillator 2, into which radiation is incident and which emits light using the energy lost, has a plate-like structure with a uniform thickness relative to the detection surface. Therefore, the light emitted in the vicinity of the photomuls 5a and 5b has a high light transmission efficiency because it is close to the photomals, and because it is located in the center of the detector, it has a high geometrical efficiency with respect to radiation, and
The detection efficiency distribution characteristics shown in the figure are shown.
このように、シンチレータの材質や厚さが検出
面全面に均一であつても、シンチレータ２からフ
オトマル５ａ，５ｂへの光の伝達効率が、検出面
位置で異なることや、放射線の入射面の幾何学的
効率が場所に依存するため、検出面での検出効率
が中心部と端では大きな差を示すという問題があ
つた。 In this way, even if the material and thickness of the scintillator are uniform over the entire detection surface, the transmission efficiency of light from the scintillator 2 to the photoprints 5a and 5b may differ depending on the detection surface position, and the geometry of the radiation incident surface may vary. Since the scientific efficiency depends on the location, there was a problem in that the detection efficiency on the detection surface showed a large difference between the center and the edges.
本発明は、検出面での検出効率が均一または或
る特定の分布となるシンチレーシヨン検出器を提
供することを目的とする。
An object of the present invention is to provide a scintillation detector in which the detection efficiency on the detection surface is uniform or has a certain specific distribution.
本発明は、シンチレーシヨン検出器において、
シンチレータからの光のフオトマルへの伝達効率
が検出面の中央部と周辺部とで均一に近くなるよ
う前記シンチレータの板厚を前記検出面の中央部
よりも周辺部を厚くしたことを特徴とする。
The present invention provides a scintillation detector including:
The scintillator is characterized in that the plate thickness of the scintillator is made thicker at the periphery than at the center of the detection surface so that the transmission efficiency of light from the scintillator to the photoprint is nearly uniform between the center and periphery of the detection surface. .
以下、本発明の実施例を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.
本発明一実施例のシンチレーシヨン検出器を第
１図に示す。ケース１４は箱状でその一面が検出
面として開放されている。この検出面を閉塞する
ように表面から順に、遮光膜１１、各々厚さの異
なる４枚のシンチレータ１２ａ，１２ｂ，１２
ｃ，１２ｄ、例えば透明樹脂からなる光ガイド１
３の３者が互いに密着されて配置されている。そ
して、光ガイド１３に対向してフオトマル１５
ａ，１５ｂがケース１４の背面側に配置されてい
る。検出面の端寄りに配置されているシンチレー
タ１２ａ，１２ｄはその厚さが大であり、検出面
の中央寄りに配置されているシンチレータ１２
ｂ，１２ｃその厚さが小である。 A scintillation detector according to an embodiment of the present invention is shown in FIG. The case 14 is box-shaped and one side thereof is open as a detection surface. A light shielding film 11 and four scintillators 12a, 12b, 12 each having a different thickness are arranged in order from the surface so as to close this detection surface.
c, 12d, light guide 1 made of transparent resin, for example
3 are arranged in close contact with each other. Then, facing the light guide 13, a photo mark 15
a and 15b are arranged on the back side of the case 14. The scintillators 12a and 12d placed near the edges of the detection surface are thicker than the scintillators 12a and 12d placed near the center of the detection surface.
b, 12c, the thickness is small.
さて、放射線がシンチレータに入射した時、そ
のエネルギーが光に変換され、その時の光量は、
放射線の失うエネルギーの大きさに依存する。ま
たシンチレータの厚さに対しても発光量が依存す
る。第１図に示した本発明一実施例のシンチレー
シヨン検出器では、検出面の中央寄りに配置され
ているシンチレータ１２ｂ，１２ｃがその厚さが
薄く、検出面の端寄りに配置されているシンチレ
ータ１２ａ，１２ｄはその厚さが厚い構成にした
ことにより、検出面の中央付近で発光した光はフ
オトマル５ａ，５ｂに近いため光の伝達効率が高
く且つ検出器中心部であるため放射線に対する幾
何学的効率が高いという特性をシンチレータの厚
さを小にすることによつて発光量を小さくすると
いう作用によりネガテイブに補正し、また、検出
面の両端寄りでは光の伝達効率が低く且つ放射線
に対する幾何学的効率が低いという特性をシンチ
レータの厚さを大にすることによつて発光量を大
きくするという作用によりポジテイブに補正する
ようにして、検出面での検出効率をほぼ均一にす
ることができる。 Now, when radiation enters the scintillator, its energy is converted into light, and the amount of light at that time is
It depends on the amount of energy lost by radiation. The amount of light emitted also depends on the thickness of the scintillator. In the scintillation detector according to the embodiment of the present invention shown in FIG. 1, the scintillators 12b and 12c placed near the center of the detection surface are thin, and the scintillators 12b and 12c placed near the edges of the detection surface are thin. 12a and 12d have a thick structure, so that the light emitted near the center of the detection surface has a high light transmission efficiency because it is close to the photoprints 5a and 5b, and since it is in the center of the detector, it has a good geometry with respect to radiation. The characteristic of high optical efficiency is negatively corrected by reducing the amount of light emitted by reducing the thickness of the scintillator, and the light transmission efficiency is low near both ends of the detection surface and the geometrical By increasing the thickness of the scintillator to increase the amount of light emitted, the characteristic of low chemical efficiency can be positively corrected, and the detection efficiency on the detection surface can be made almost uniform. .
次に、第２図に本発明によるシンチレーシヨン
検出器の他の実施例を示す。第２図に示すよう
に、シンチレータ２２を検出面の両端部で厚く、
漸次厚さが減り中心部で薄くした一枚板に形成す
る。そして、遮光膜１１に接する側に平坦面を向
けて配置する。したがつて、光ガイド２３のシン
チレータ２２に接する面はシンチレータ２２のカ
ーブ面に合わせて形成される。このように形成さ
れたシンチレーシヨン検出器では、中心部の発光
量や発光確立が減ることにより、光の伝達効率や
放射線に対する幾何学的効率を補償し、検出面全
体が第３図に示すように均一な特性となる。 Next, FIG. 2 shows another embodiment of the scintillation detector according to the present invention. As shown in FIG. 2, the scintillator 22 is made thicker at both ends of the detection surface.
It is formed into a single plate whose thickness gradually decreases and becomes thinner in the center. Then, it is arranged with the flat surface facing the side in contact with the light shielding film 11. Therefore, the surface of the light guide 23 in contact with the scintillator 22 is formed to match the curved surface of the scintillator 22. In the scintillation detector formed in this way, by reducing the amount of light emission and the probability of light emission in the center, the light transmission efficiency and the geometric efficiency against radiation are compensated, and the entire detection surface becomes as shown in Figure 3. It has uniform characteristics.
なお、本発明は上述した二つの実施例に限らず
次のように変形して実施できる。 Note that the present invention is not limited to the two embodiments described above, and can be implemented with the following modifications.
〔a〕 検出面に対して厚さが場所で異なるシンチ
レータの構成は、検出面での検出効率を均一に
するか特定の分布にするかによつて適宜に定め
ることができる。すなわち、第４図ａの例は、
各々厚さの異なる４枚のシンチレータを中央部
に薄いもの２２ｂ，２２ｃを、両端部に厚いも
の２２ａ，２２ｄをそれぞれ配置し、且つ各シ
ンチレータごとに分割された一様な厚さの光ガ
イド３ａ，３ｂ，３ｃ，３ｄを配置し、シンチ
レータの遮光膜に接する面に段差を持たせたも
のである。また、第４図ｂの例は、平坦な１枚
板の光ガイド３の上に２種類の厚さのシンチレ
ータ３２ａ，３２ｂを、検出面の一端側から３
２ａ，３２ｂ，３２ａ，３２ｂというように厚
いものと薄いものを一つおきに入れ違えて配置
したものである。さらに、第４図ｃの例は、同
じ厚さのシンチレータ４２の重ねる枚数を両端
部で２枚重ね、中央部で１枚重ねと異ならせて
配置し、光ガイドは、各シンチレータごとに分
割された一様な厚さのもの３ａ，３ｂ，３ｃ，
３ｄを配置するとともに、中央部の１枚重ねの
シンチレータに対してはシンチレータ４２の１
枚の厚さを有する光ガイド２３をスペーサとし
て挿入した構成である。[a] The configuration of the scintillator whose thickness differs from place to place with respect to the detection surface can be appropriately determined depending on whether the detection efficiency on the detection surface is uniform or has a specific distribution. That is, the example in FIG. 4a is
A light guide 3a with a uniform thickness is arranged in which four scintillators of different thicknesses are arranged, a thin one 22b, 22c in the center and a thick one 22a, 22d at both ends, and divided into each scintillator. , 3b, 3c, and 3d are arranged, and the surface of the scintillator in contact with the light-shielding film has a step difference. In addition, in the example shown in FIG. 4b, scintillators 32a and 32b of two different thicknesses are placed on the flat single-plate light guide 3 from one end of the detection surface.
Thick and thin pieces such as 2a, 32b, 32a, and 32b are arranged alternately. Furthermore, in the example shown in FIG. 4c, the number of stacked scintillators 42 of the same thickness is different, with two stacked at both ends and one stacked at the center, and the light guide is divided for each scintillator. Those of uniform thickness 3a, 3b, 3c,
3d, and one of the scintillators 42 for the single stacked scintillator in the center.
This is a configuration in which a light guide 23 having a thickness of 100 mm is inserted as a spacer.
〔b〕 光ガイドの形状、フオトマルの配置や個数
は例示したものに限らない。[b] The shape of the light guide, the arrangement and number of photoprints are not limited to those illustrated.
以上詳述したように本発明によれば、シンチレ
ーシヨン検出器において、シンチレータからの光
フオトマルへの伝達効率が検出面の中央部と周辺
部とで均一に近くなるよう前記シンチレータの板
厚を前記検出面の中央部よりも周辺部を厚くする
ようにしたことにより、測定対象物の表面汚染を
むらなく測定できるとともに、特に複数のシンチ
レーシヨン検出器を並べてより大きな検出面を構
成する場合に、各検出器のつなぎ目における検出
感度の変化が無い良好な検出面を構成することが
可能となる。
As described in detail above, according to the present invention, in a scintillation detector, the thickness of the scintillator is set so that the transmission efficiency from the scintillator to the optical photoluminium is nearly uniform between the center and the periphery of the detection surface. By making the peripheral part of the detection surface thicker than the central part, it is possible to measure surface contamination of the object to be measured evenly, and especially when arranging multiple scintillation detectors to form a larger detection surface. It is possible to construct a good detection surface without any change in detection sensitivity at the joints between the detectors.
第１図は本発明一実施例のシンチレーシヨン検
出器を示す断面図、第２図は本発明の他の実施例
のシンチレーシヨン検出器を示す断面図、第３図
は第２図のシンチレーシヨン検出器の検出面での
検出特性を示すグラフ、第４図ａ，ｂ，ｃはそれ
ぞれ本発明によるシンチレータの構成の異なる変
形例を示す断面図、第５図は従来のシンチレーシ
ヨン検出器を示す断面図、第６図は第５図のシン
チレーシヨン検出器の検出面での検出特性を示す
グラフである。
１１……遮光膜、１２ａ，１２ｂ，１２ｃ，１
２ｄ……各々厚さの異なるシンチレータ、１３…
…光ガイド、１４……ケース、１５ａ，１５ｂ…
…フオトマル、２２……シンチレータ、２３……
光ガイド。
FIG. 1 is a cross-sectional view showing a scintillation detector according to one embodiment of the present invention, FIG. 2 is a cross-sectional view showing a scintillation detector according to another embodiment of the present invention, and FIG. 3 is a cross-sectional view showing a scintillation detector according to another embodiment of the present invention. Graphs showing the detection characteristics on the detection surface of the detector; FIGS. 4a, b, and c are cross-sectional views showing different modifications of the scintillator configuration according to the present invention, and FIG. 5 shows a conventional scintillation detector. The cross-sectional view, FIG. 6, is a graph showing the detection characteristics of the scintillation detector of FIG. 5 on the detection surface. 11... Light shielding film, 12a, 12b, 12c, 1
2d...Scintillators each having a different thickness, 13...
...Light guide, 14...Case, 15a, 15b...
...Photomaru, 22...Scintillator, 23...
light guide.
Claims (1)
ており、この検出面を閉塞して表面から順に遮光
膜、シンチレータ、光ガイドが配置され、この光
ガイドに対向してフオトマルが前記ケースの背面
側に配置されてなるシンチレーシヨン検出器にお
いて、前記シンチレータからの光のフオトマルへ
の伝達効率が前記検出面の中央部と周辺部とで均
一に近くなるよう前記シンチレータの板厚を前記
検出面の中央部よりも周辺部を厚くした構造であ
ることを特徴とするシンチレーシヨン検出器。1. One side of the box-shaped case is open as a detection surface, and this detection surface is closed and a light-shielding film, a scintillator, and a light guide are arranged in order from the surface. In the scintillation detector disposed on the side of the detection surface, the thickness of the scintillator is adjusted so that the transmission efficiency of light from the scintillator to the photoform is nearly uniform between the center and the periphery of the detection surface. A scintillation detector characterized by a structure in which the peripheral portion is thicker than the central portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4191185A JPS61201183A (en) | 1985-03-05 | 1985-03-05 | Scintillation detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4191185A JPS61201183A (en) | 1985-03-05 | 1985-03-05 | Scintillation detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61201183A JPS61201183A (en) | 1986-09-05 |
| JPH0562709B2 true JPH0562709B2 (en) | 1993-09-09 |
Family
ID=12621451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4191185A Granted JPS61201183A (en) | 1985-03-05 | 1985-03-05 | Scintillation detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61201183A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19808340C1 (en) * | 1998-02-27 | 1999-07-22 | Siemens Ag | X-ray diagnostics device useful for normal radiography and mammography has a variable thickness x-ray absorber layer |
| JP2001074847A (en) | 1999-07-08 | 2001-03-23 | Canon Inc | Radiation image pickup device and radiation image pickup system |
| JP4607372B2 (en) * | 2001-05-15 | 2011-01-05 | 株式会社東芝 | Radiation detector |
| DE102010040578A1 (en) * | 2010-09-10 | 2012-03-15 | Siemens Aktiengesellschaft | X-ray detector e.g. two-dimensional line camera, for e.g. wavelength-dispersive X-ray spectroscopy for analytical sampling of material, has scintillator layer arranged above sensor, where thickness of layer changes along lying direction |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5434884A (en) * | 1977-08-24 | 1979-03-14 | Toshiba Corp | Gamma ray detector |
| JPS5741698A (en) * | 1980-08-26 | 1982-03-08 | Nippon Hamondo Kk | Multiplex keying device for electronic musical instrument |
| JPS60219579A (en) * | 1984-04-16 | 1985-11-02 | Hitachi Ltd | Radiation detector |
-
1985
- 1985-03-05 JP JP4191185A patent/JPS61201183A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5434884A (en) * | 1977-08-24 | 1979-03-14 | Toshiba Corp | Gamma ray detector |
| JPS5741698A (en) * | 1980-08-26 | 1982-03-08 | Nippon Hamondo Kk | Multiplex keying device for electronic musical instrument |
| JPS60219579A (en) * | 1984-04-16 | 1985-11-02 | Hitachi Ltd | Radiation detector |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61201183A (en) | 1986-09-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |