JPWO2013136804A1 - 固体シンチレータ、放射線検出器、および放射線検査装置 - Google Patents
固体シンチレータ、放射線検出器、および放射線検査装置 Download PDFInfo
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- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 2
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- 238000001514 detection method Methods 0.000 description 8
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- -1 europium-activated barium chloride fluoride Chemical class 0.000 description 7
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- 229910052688 Gadolinium Inorganic materials 0.000 description 5
- 229910052765 Lutetium Inorganic materials 0.000 description 5
- 230000035945 sensitivity Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
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- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- HEQHIXXLFUMNDC-UHFFFAOYSA-N O.O.O.O.O.O.O.[Tb].[Tb].[Tb].[Tb] Chemical compound O.O.O.O.O.O.O.[Tb].[Tb].[Tb].[Tb] HEQHIXXLFUMNDC-UHFFFAOYSA-N 0.000 description 3
- 238000000149 argon plasma sintering Methods 0.000 description 3
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- 238000000295 emission spectrum Methods 0.000 description 3
- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 description 3
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- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 3
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 3
- MPARYNQUYZOBJM-UHFFFAOYSA-N oxo(oxolutetiooxy)lutetium Chemical compound O=[Lu]O[Lu]=O MPARYNQUYZOBJM-UHFFFAOYSA-N 0.000 description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 3
- 229910052721 tungsten Inorganic materials 0.000 description 3
- 239000010937 tungsten Substances 0.000 description 3
- 229910052693 Europium Inorganic materials 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
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- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 2
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- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 1
- 238000007088 Archimedes method Methods 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
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- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 229910005191 Ga 2 O 3 Inorganic materials 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
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- 238000005755 formation reaction Methods 0.000 description 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical group [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000001513 hot isostatic pressing Methods 0.000 description 1
- 238000004255 ion exchange chromatography Methods 0.000 description 1
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- 229920003303 ion-exchange polymer Polymers 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- OHSVLFRHMCKCQY-UHFFFAOYSA-N lutetium atom Chemical compound [Lu] OHSVLFRHMCKCQY-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
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- 239000012299 nitrogen atmosphere Substances 0.000 description 1
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- 230000035699 permeability Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- GZCRRIHWUXGPOV-UHFFFAOYSA-N terbium atom Chemical compound [Tb] GZCRRIHWUXGPOV-UHFFFAOYSA-N 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
- 238000009283 thermal hydrolysis Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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Abstract
Description
一般式:(Gd1−α−β−γTbαLuβCeγ)3(Al1−xGax)aOb
(式中、α、βおよびγは0<α≦0.55、βは0<β≦0.55、0.0001≦γ≦0.1、α+β+γ<1を満足する数(原子比)、xは0<x<1を満足する数(原子比)、aは4.8≦a≦5.2を満足する数(原子比)、bは11.6≦b≦12.4を満足する数(原子比)である。)
原料粉末として、酸化ガドリニウム(Gd2O3)粉末、酸化テルビウム(Tb4O7)粉末、酸化ルテチウム(Lu2O3)粉末、酸化セリウム(CeO2)粉末、酸化アルミニウム(Al2O3)粉末、および酸化ガリウム(Ga2O3)粉末を用意した。これら原料粉末を所定の比率で混合し、さらにBaF2フラックスと混合した。BaF2フラックスの添加量は、原料粉末の合計量100質量部に対して4〜5質量部とした。
酸化ガドリニウム(Gd2O3)粉末、酸化テルビウム(Tb4O7)粉末、酸化ルテチウム(Lu2O3)粉末、酸化セリウム(CeO2)粉末、酸化アルミニウム(Al2O3)粉末、および酸化ガリウム(Ga2O3)粉末を、表3に示す組成となるように所定の比率で混合し、さらにBaF2フラックスと混合した。BaF2フラックスの添加量は、原料粉末の合計量100質量部に対して2〜6質量部とした。
実施例1〜12および比較例1の固体シンチレータを用いて放射線検出器(実施例1A〜12A、比較例1A)を作製し、残光が5%になるまでの減衰時間を調べた。X線CT装置のX線源となるX線管(電子線照射面はRe−W合金で構成)を使用して、実施例1〜12Aおよび比較例1Aの放射線検出器にX線を照射した。光出力の最大値を100%としたときに、X線による励起を終了した後に光出力が最大値の5%になるまでの減衰時間を測定した。その結果を表8に示す。
Claims (15)
- ガーネット構造を有する酸化物の多結晶体を具備する固体シンチレータであって、
波長680nmの直線透過率が10%以上であることを特徴とする固体シンチレータ。 - 前記波長680nmの直線透過率が20%以上である、請求項1に記載の固体シンチレータ。
- 前記酸化物は、
一般式:(Gd1−α−β−γTbαLuβCeγ)3(Al1−xGax)aOb
(式中、α、βおよびγは0<α≦0.55、βは0<β≦0.55、0.0001≦γ≦0.1、α+β+γ<1を満足する数(原子比)、xは0<x<1を満足する数(原子比)、aは4.8≦a≦5.2を満足する数(原子比)、bは11.6≦b≦12.4を満足する数(原子比)である。)
で表される組成を有する、請求項1に記載の固体シンチレータ。 - 前記一般式において、αは0.1≦α≦0.5を満足し、βは0.01≦β≦0.5を満足し、xは0.01≦x≦0.8を満足する、請求項3に記載の固体シンチレータ。
- 前記一般式において、αとβとγの合計量はα+β+γ≦0.9を満足する、請求項3に記載の固体シンチレータ。
- バリウムの含有量が400質量ppm以下(ゼロを含む)である、請求項3に記載の固体シンチレータ。
- フッ素の含有量が300質量ppm以下(ゼロを含む)である、請求項3に記載の固体シンチレータ。
- X線回折におけるガーネット相の最強ピーク強度IGに対するペロブスカイト相の最強ピーク強度IPの比(IP/IG)が0.01以下(ゼロを含む)である、請求項3に記載の固体シンチレータ。
- 前記固体シンチレータをX線で励起したときの最強発光ピークが530nm以上560nm以下の範囲に存在する、請求項3に記載の固体シンチレータ。
- 残光が5%になるまでの減衰時間が5ms以下である、請求項3に記載の固体シンチレータ。
- 前記多結晶体の平均結晶粒径が2μm以上50μm以下の範囲である、請求項1に記載の固体シンチレータ。
- 前記多結晶体の相対密度が99.5%以上である、請求項1に記載の固体シンチレータ。
- 波長680nmの拡散透過率が50%以上である、請求項1に記載の固体シンチレータ。
- 請求項1に記載の固体シンチレータを具備する放射線検出器。
- 請求項14記載の放射線検出器を具備する放射線検査装置。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012059477 | 2012-03-15 | ||
JP2012059477 | 2012-03-15 | ||
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CN104169392A (zh) | 2014-11-26 |
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US20150021485A1 (en) | 2015-01-22 |
EP2826835B1 (en) | 2018-03-07 |
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