JP5129473B2 - 放射線検出器 - Google Patents
放射線検出器 Download PDFInfo
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- JP5129473B2 JP5129473B2 JP2006304241A JP2006304241A JP5129473B2 JP 5129473 B2 JP5129473 B2 JP 5129473B2 JP 2006304241 A JP2006304241 A JP 2006304241A JP 2006304241 A JP2006304241 A JP 2006304241A JP 5129473 B2 JP5129473 B2 JP 5129473B2
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- scintillator
- film transistor
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- radiation detector
- thin film
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- 230000005855 radiation Effects 0.000 title claims description 60
- 239000000758 substrate Substances 0.000 claims description 39
- 239000010409 thin film Substances 0.000 claims description 35
- 239000004065 semiconductor Substances 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 11
- 238000010030 laminating Methods 0.000 claims description 6
- 238000011978 dissolution method Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 230000001747 exhibiting effect Effects 0.000 claims description 2
- 239000010408 film Substances 0.000 description 27
- 239000007787 solid Substances 0.000 description 14
- 229910021417 amorphous silicon Inorganic materials 0.000 description 9
- 238000001514 detection method Methods 0.000 description 8
- 238000002834 transmittance Methods 0.000 description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 7
- 239000011521 glass Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 5
- 230000031700 light absorption Effects 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052769 Ytterbium Inorganic materials 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 2
- LYQFWZFBNBDLEO-UHFFFAOYSA-M caesium bromide Chemical compound [Br-].[Cs+] LYQFWZFBNBDLEO-UHFFFAOYSA-M 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 230000010365 information processing Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- KIIFVSJBFGYDFV-UHFFFAOYSA-N 1h-benzimidazole;perylene Chemical group C1=CC=C2NC=NC2=C1.C1=CC(C2=CC=CC=3C2=C2C=CC=3)=C3C2=CC=CC3=C1 KIIFVSJBFGYDFV-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- 229910052765 Lutetium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 229910007541 Zn O Inorganic materials 0.000 description 1
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- 229910052792 caesium Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- -1 cesium halide Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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- 238000002059 diagnostic imaging Methods 0.000 description 1
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- 229910052736 halogen Inorganic materials 0.000 description 1
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- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- SJHHDDDGXWOYOE-UHFFFAOYSA-N oxytitamium phthalocyanine Chemical compound [Ti+2]=O.C12=CC=CC=C2C(N=C2[N-]C(C3=CC=CC=C32)=N2)=NC1=NC([C]1C=CC=CC1=1)=NC=1N=C1[C]3C=CC=CC3=C2[N-]1 SJHHDDDGXWOYOE-UHFFFAOYSA-N 0.000 description 1
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 1
- 238000001959 radiotherapy Methods 0.000 description 1
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- 238000007740 vapor deposition Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Images
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- Light Receiving Elements (AREA)
- Measurement Of Radiation (AREA)
- Solid State Image Pick-Up Elements (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
Description
dj/dz= (β+α)j−αi …… (2)
上記式において、「γ2 =β(β+2α)」、「ξ=(α+β−γ)/α」、「η=(α+β+γ)/α」とし、積分定数をKおよびLとすると、上記連立方程式のiおよびjに関する一般解は、下記式となる。
j(Z)=Kξexp(−γZ)+Lηexp(γZ)
厚さdのフィルム試料の透過率Tは「T=i(d)/i(0)」である。この際において、フィルム試料単独で透過率を測定する場合に、戻り光がない(すなわち、j(d)=0)と仮定すると、透過率Tはフィルム試料の厚さdの関数として、下記式(3)で示
すことができる。
測定した各フィルム試料の透過率Tと厚さdを、式(3)入れて、最小二乗法等を用いて最適化することにより、散乱長S=(1/α)、さらに吸収長1/βを求めることができる。
2 固体光検出器
3A,3B シンチレータ
4 X線源
5 X線
6 被写体
7 情報処理手段
8 再生手段
9 支持体
10 光導電部
12 光導電層
20 薄膜トランジスタ層
20a 薄膜トランジスタ
21 透明な薄い基板
Claims (6)
- 照射された放射線を光に変換する2層のシンチレータと、
該2層のシンチレータの間に配置された、該2層のシンチレータにより変換された光を検出して電気信号に変換する固体光検出器とを備えた放射線検出器において、
前記各シンチレータの該シンチレータの面に平行な方向に進む光に対する散乱長が100μm以下であり、
前記固体光検出器が、前記光により導電性を呈する光導電層と、該光導電層から電気信号を取り出すための薄膜トランジスタとが積層されてなるものであり、
前記薄膜トランジスタの活性層が、アモルファス酸化物半導体からなるものであり、
前記2層のシンチレータの対向する表面間の間隔が40μm以下である
ことを特徴とする放射線検出器。 - 前記アモルファス酸化物半導体が、a−InGaZnO4であることを特徴とする請求項1記載の放射線検出器。
- 前記薄膜トランジスタが、基板上に形成され、該基板から剥離転写されたものであることを特徴とする請求項1から4のいずれか1項記載の放射線検出器。
- 前記薄膜トランジスタが、該薄膜トランジスタが形成された基板を、化学的溶解法または研磨法により薄くし、あるいは除去したものであることを特徴とする請求項1から4のいずれか1項記載の放射線検出器。
- 前記薄膜トランジスタが、支持体上に剥離可能に配された基板上に形成され、該基板ごと前記支持体から剥離されたものであることを特徴とする請求項1から4のいずれか1項記載の放射線検出器。
- 前記薄膜トランジスタが、透明薄膜トランジスタであることを特徴とする請求項1から6のいずれか1項記載の放射線検出器。
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JP2006304241A JP5129473B2 (ja) | 2005-11-15 | 2006-11-09 | 放射線検出器 |
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JP2005329564 | 2005-11-15 | ||
JP2005329564 | 2005-11-15 | ||
JP2006304241A JP5129473B2 (ja) | 2005-11-15 | 2006-11-09 | 放射線検出器 |
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JP2007163467A JP2007163467A (ja) | 2007-06-28 |
JP5129473B2 true JP5129473B2 (ja) | 2013-01-30 |
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