JPH04220600A - Fiber screen for x rays - Google Patents
Fiber screen for x raysInfo
- Publication number
- JPH04220600A JPH04220600A JP2404486A JP40448690A JPH04220600A JP H04220600 A JPH04220600 A JP H04220600A JP 2404486 A JP2404486 A JP 2404486A JP 40448690 A JP40448690 A JP 40448690A JP H04220600 A JPH04220600 A JP H04220600A
- Authority
- JP
- Japan
- Prior art keywords
- rays
- screen
- image sensor
- fiber
- needle
- 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.)
- Pending
Links
- 239000000835 fiber Substances 0.000 title claims abstract description 24
- 239000013078 crystal Substances 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims abstract description 10
- 229910004829 CaWO4 Inorganic materials 0.000 claims abstract description 8
- 238000007716 flux method Methods 0.000 claims abstract description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 claims 1
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 239000002253 acid Substances 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 1
- 229910052721 tungsten Inorganic materials 0.000 abstract 1
- 239000010937 tungsten Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Apparatus For Radiation Diagnosis (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
- Conversion Of X-Rays Into Visible Images (AREA)
- Measurement Of Radiation (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、産業用，医療用等に使
われているＸ線用蛍光スクリーンに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an X-ray fluorescent screen used for industrial, medical, etc. purposes.
【０００２】0002
【従来の技術】従来、Ｘ線用蛍光スクリーンは、基板上
に粉体の蛍光体を適当な厚さに塗布したものであった。2. Description of the Related Art Conventionally, X-ray fluorescent screens have been made by coating a substrate with powdered phosphor to a suitable thickness.
【０００３】0003
【発明が解決しようとする課題】上記のような蛍光スク
リーンでは、Ｘ線照射による、蛍光スクリーン上部での
発光は拡散されてしまい、分解能の低下に欠点があった
。そして、この解決が課題とされた。The above-mentioned fluorescent screen has a drawback in that the light emitted from the upper part of the fluorescent screen due to X-ray irradiation is diffused, resulting in a decrease in resolution. The problem was to solve this problem.
【０００４】0004
【課題を解決するための手段】上記課題を解決するため
に、本発明では、Ｘ線用蛍光スクリーンの蛍光体を粉体
ではなく、ＣａＷＯ４ ，ＺｎＷＯ４，ＣｄＷＯ４ 針
状結晶のいずれかを基板上にファイバー状に形成させる
ことにより、蛍光スクリーンの横方向への拡散を防ぐも
のとした。[Means for Solving the Problems] In order to solve the above problems, in the present invention, the phosphor of the X-ray fluorescent screen is not a powder, but one of CaWO4, ZnWO4, and CdWO4 acicular crystals is formed on a substrate. By forming the fluorescent screen in the form of fibers, it is possible to prevent the fluorescent screen from spreading in the lateral direction.
【０００５】[0005]
【作用】上記のような発光効率に優れた蛍光体の針状結
晶をファイバー状に基板上に形成させることにより、分
解能を高めることができる。[Operation] Resolution can be improved by forming needle-shaped phosphor crystals with excellent luminous efficiency as described above in the form of fibers on a substrate.
【０００６】[0006]
【実施例】以下に本発明の実施例を図面に基づいて説明
する。第１実施例は、合成樹脂基板上にＣａＷＯ４ 針
状結晶をファイバー状に静電植毛法を用いて形成させた
Ｘ線増感紙である。ＣａＷＯ４ 針状結晶は、以下のよ
うにフラックス法を用いて合成する。ＣａＣＯ３ ，Ｗ
Ｏ３ の等モル混合物を１０００℃で３時間加熱するこ
とにより、溶質ＣａＷＯ４ を得る。また、融剤として
ＫＣｌを用いる。溶質ＣａＷＯ４ が１．０ｍｏｌ％に
なるように乾式混合した調合物を白金るつぼに充填し、
電気炉で最高温度９００℃まで２４時間かけて温度上昇
させ、５時間保持した後、５℃／ｈの冷却速度で５００
℃まで徐冷し以後放冷した。るつぼ内で固化した融剤は
温水で除去して結晶を取りだした。取り出した結晶は、
径数十μｍ，長さ数百μｍの大きさに分級した。DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below with reference to the drawings. The first embodiment is an X-ray intensifying screen in which CaWO4 acicular crystals are formed in the form of fibers on a synthetic resin substrate using an electrostatic flocking method. CaWO4 needle crystals are synthesized using the flux method as follows. CaCO3,W
The solute CaWO4 is obtained by heating an equimolar mixture of O3 at 1000° C. for 3 hours. Further, KCl is used as a fluxing agent. A platinum crucible was filled with a dry-mixed mixture so that the solute CaWO4 was 1.0 mol%,
The temperature was raised to a maximum temperature of 900°C over 24 hours in an electric furnace, held for 5 hours, and then heated to 500°C at a cooling rate of 5°C/h.
The mixture was slowly cooled to ℃ and then allowed to cool. The flux solidified in the crucible was removed with warm water and the crystals were taken out. The crystals taken out are
It was classified into sizes of several tens of μm in diameter and several hundred μm in length.
【０００７】この針状結晶は静電植毛法を用いてファイ
バー状に形成する。まず、針状結晶に導電性を持たせる
ために、帯電防止剤を結晶に塗布する。また、合成樹脂
基板を平行平板電極とし、誘電処理済みのＣａＷＯ４
針状結晶を載せ、３００ｋｖの電圧をかけ、一方の電極
上にファイバー状に形成させ、第１図に示すようなＸ線
増感紙を作成した。[0007] This needle-like crystal is formed into a fiber shape using an electrostatic flocking method. First, an antistatic agent is applied to the needle crystals to make them conductive. In addition, the synthetic resin substrate is used as a parallel plate electrode, and the dielectrically treated CaWO4
A needle-like crystal was placed on it, and a voltage of 300 kV was applied to form a fiber-like crystal on one electrode, thereby creating an X-ray intensifying screen as shown in FIG.
【０００８】このファイバースクリーンを用いたＸ線増
感紙の分解能は、従来のスクリーンを用いたＸ線増感紙
の分解能の２倍向上した。第２実施例は、ファイバープ
レート上にＺｎＷＯ４ 針状結晶をファイバー状に形成
させたＸ線イメージセンサーである。ＺｎＷＯ４ 針状
結晶の合成法は、実施例１と同様であるが、溶質ＺｎＷ
Ｏ４ を５．０ｍｏｌ％とした。更に、取り出した結晶
は径数μｍ，長さ数十μｍの大きさに分級した。ファイ
バープレート４上へは、実施例１と同様に導電性を持た
せた後、静電植毛してファイバースクリーン２を形成し
、第２図に示すように、固体撮像素子６と光学接着剤で
密着させ一体化したＸ線イメージセンサーを作成した。
このファイバースクリーンを用いたＸ線イメージセンサ
ーは、従来の蛍光スクリーンを用いたＸ線イメージセン
サーの分解能の３倍向上した。The resolution of an X-ray intensifying screen using this fiber screen is twice as high as that of an X-ray intensifying screen using a conventional screen. The second embodiment is an X-ray image sensor in which ZnWO4 needle crystals are formed in the form of fibers on a fiber plate. The method for synthesizing ZnWO4 needle-like crystals is the same as in Example 1, but the solute ZnW
O4 was set to 5.0 mol%. Furthermore, the extracted crystals were classified into sizes of several μm in diameter and several tens of μm in length. After imparting conductivity to the fiber plate 4 in the same manner as in Example 1, the fiber screen 2 is formed by electrostatic flocking, and as shown in FIG. An integrated X-ray image sensor was created. The resolution of an X-ray image sensor using this fiber screen is three times higher than that of a conventional X-ray image sensor using a fluorescent screen.
【０００９】第３実施例は、イメージバンドル上に、Ｃ
ｄＷＯ４ 針状結晶をファイバー状に形成させたＸ線イ
メージセンサーである。ＣｄＷＯ４ 針状結晶の合成法
、およびファイバースクリーンの形成法は、第１実施例
と同様である。また、Ｘ線イメージセンサーの構成は、
第２実施例とほぼ同様であるが、ファイバー部材として
第２実施例ではファイバープレート４を用いたが第３実
施例ではイメージバンドル８を用い、第３図に示すよう
なＸ線イメージセンサーを作成した。In the third embodiment, C
This is an X-ray image sensor in which dWO4 needle crystals are formed into fibers. The method for synthesizing the CdWO4 needle-like crystals and the method for forming the fiber screen are the same as in the first example. In addition, the configuration of the X-ray image sensor is
Although it is almost the same as the second embodiment, the fiber plate 4 was used as the fiber member in the second embodiment, but the image bundle 8 was used in the third embodiment to create an X-ray image sensor as shown in FIG. did.
【００１０】このファイバースクリーンを用いたＸ線イ
メージセンサーは、従来の蛍光スクリーンを用いたＸ線
イメージセンサーの分解能の２倍向上した。An X-ray image sensor using this fiber screen has twice the resolution of an X-ray image sensor using a conventional fluorescent screen.
【００１１】[0011]
【発明の効果】本発明によれば、高発光効率蛍光体の針
状結晶を基板上にファイバー状に形成させることにより
、スクリーンの横方向への拡散がなくなり、Ｘ線増感紙
，Ｘ線イメージセンサー等の分解能の向上を図ることが
できた。Effects of the Invention According to the present invention, by forming acicular crystals of a highly luminous efficiency phosphor in the form of fibers on a substrate, diffusion in the lateral direction of the screen is eliminated, and X-ray intensifying screens, We were able to improve the resolution of image sensors, etc.
【図１】本発明のＸ線増感紙としての実施例を示す断面
図である。FIG. 1 is a sectional view showing an embodiment of an X-ray intensifying screen of the present invention.
【図２】本発明のＸ線イメージセンサ−としての実施例
を示す断面図である。FIG. 2 is a sectional view showing an embodiment of the present invention as an X-ray image sensor.
【図３】本発明のＸ線イメージセンサーとしての他の実
施例を示す断面図である。FIG. 3 is a sectional view showing another embodiment of the X-ray image sensor of the present invention.
１ 台紙 ２ ファイバースクリーン ３ 合成樹脂基板 ４ ファイバープレート ５ リードフレーム ６ 固体撮像素子 ７ アルミナ基板 ８ イメージバンドル 1 Mount 2 Fiber screen 3 Synthetic resin substrate 4 Fiber plate 5 Lead frame 6 Solid-state image sensor 7 Alumina substrate 8 Image bundle
Claims (2)
ン酸塩系蛍光体を、ファイバー状に形成させたことを特
徴とするＸ線用ファイバースクリーン。1. A fiber screen for X-rays, characterized in that a tungstate-based phosphor having needle-like crystals is formed in the form of fibers on a substrate.
り合成したＣａＷＯ４，ＺｎＷＯ４，ＣｄＷＯ４ 針状
結晶のいずれかを用いることを特徴とする請求項１記載
のＸ線用ファイバースクリーン。2. The X-ray fiber screen according to claim 1, wherein the phosphor is one of CaWO4, ZnWO4, and CdWO4 needle crystals synthesized by a flux method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2404486A JPH04220600A (en) | 1990-12-20 | 1990-12-20 | Fiber screen for x rays |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2404486A JPH04220600A (en) | 1990-12-20 | 1990-12-20 | Fiber screen for x rays |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04220600A true JPH04220600A (en) | 1992-08-11 |
Family
ID=18514156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2404486A Pending JPH04220600A (en) | 1990-12-20 | 1990-12-20 | Fiber screen for x rays |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04220600A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004333489A (en) * | 2003-04-30 | 2004-11-25 | Ge Medical Systems Global Technology Co Llc | Computerized tomography (ct) detector array having non-pixel type scintillator array |
-
1990
- 1990-12-20 JP JP2404486A patent/JPH04220600A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004333489A (en) * | 2003-04-30 | 2004-11-25 | Ge Medical Systems Global Technology Co Llc | Computerized tomography (ct) detector array having non-pixel type scintillator array |
| US7643607B2 (en) | 2003-04-30 | 2010-01-05 | General Electric Company | CT detector array having non-pixelated scintillator array |
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