JP7045371B2 - 放射線検出器及び放射線検出装置 - Google Patents
放射線検出器及び放射線検出装置 Download PDFInfo
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- 230000005855 radiation Effects 0.000 title claims description 202
- 239000004065 semiconductor Substances 0.000 claims description 94
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 37
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- 238000004458 analytical method Methods 0.000 description 14
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- 230000001681 protective effect Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
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- 239000012535 impurity Substances 0.000 description 2
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- 229910052710 silicon Inorganic materials 0.000 description 2
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- 241001146209 Curio rowleyanus Species 0.000 description 1
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- 238000013459 approach Methods 0.000 description 1
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- 238000004451 qualitative analysis Methods 0.000 description 1
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Description
本発明においては、複数の第2電極は、複数組の多重のループ状電極である。各組の多重のループ状電極は、順々に電位が変化するように電圧が印加される。各組の多重のループ状電極に囲まれる位置には、信号を出力するための信号出力電極が備えられている。放射線により発生した電荷が信号出力電極へ流入して、信号出力電極から信号が出力される。多重のループ状電極及び信号出力電極が一組である場合に比べて、信号出力電極の面積が小さくなり、信号出力電極に起因する静電容量が小さくなる。
(実施形態1)
図1は、実施形態1に係る放射線検出装置の構成を示すブロック図である。放射線検出装置は、試料4へ電子線(放射線)を照射し、電子線を照射された試料4から発生する特性X線(放射線)を放射線検出器1で検出する。例えば、放射線検出装置は、電子顕微鏡の一部である。放射線検出装置は、試料4に電子線(放射線)を照射する照射部31と、電子レンズ系32と、試料4が載置される試料台33を備えている。電子レンズ系32は、電子線の方向を変更させる走査コイルを含んでいる。電子レンズ系32と試料台33との間には、放射線検出器1が配置されている。放射線検出器1は、試料4へ照射される電子線を通過させるための貫通孔11を設けた板状に形成されている。放射線検出器1は、貫通孔11を電子線が通る位置に配置され、一面が試料台33に対向するように配置されている。
図6は、実施形態2に係る放射線検出器1の断面構造及び放射線検出器1の電気的な接続態様を示すブロック図である。実施形態1と同様に、放射線検出器1には、半導体部12の入射面121を内縁122まで連続的に覆った第1電極13が設けられている。更に、放射線検出器1には、半導体部12の内面を連続的に覆った第3電極17が設けられている。半導体部12の内面は、半導体部12に貫通孔11が設けられることによって形成されており、貫通孔11を囲んだ半導体部12の面である。第3電極17は、第1電極13と連続している。第3電極17は、半導体部12の内面の内、少なくとも、入射面121から連続した部分を覆っている。電圧印加部23は、各組における最も電位の低い第2電極14よりも第1電極13及び第3電極17の電位が低くなるように、第1電極13及び第3電極17に電圧を印加する。このようにして、第1電極13及び第3電極17と第2電極14との間で半導体部12に電圧が印加され、半導体部12の内部に電界が生成される。放射線検出器1のその他の構成及び機能は実施形態1と同様である。また、放射線検出装置の放射線検出器1以外の構成は、実施形態1と同様である。
図8は、実施形態3に係る放射線検出装置の構成を示すブロック図である。放射線検出装置は、電子線を照射する照射部31及び電子レンズ系32は備えておらず、X線を試料4へ照射する照射部34を備えている。照射部34はX線管を用いて構成されている。更に、放射線検出装置は、照射部31が放射するX線を収束させる光学系である収束部36を備えている。例えば、収束部36は、ポリキャピラリで構成されている。収束部36と放射線検出器1との間には、X線の照射範囲を制限する第1コリメータ35が配置され、照射部34と収束部36との間には第2コリメータ37が配置されている。放射線検出器1は、収束部36と試料台33との間に配置されている。放射線検出器1の構成は実施形態1又は2と同様である。また、放射線検出装置のその他の構成は、実施形態1又は2と同様である。
11 貫通孔
12 半導体部
121 入射面
122 内縁
13 第1電極
14 第2電極
15 信号出力電極
16 接地電極
17 第3電極
18 有感部分
21 前置増幅器
22 主増幅器
23 電圧印加部
24 信号処理部
25 分析部
31、34 照射部
4 試料
Claims (3)
- 板状の半導体部を備え、該半導体部を貫通した貫通孔が設けられており、該半導体部の一面を放射線の入射面とした放射線検出器において、
前記半導体部の入射面を連続的に内縁まで覆った第1電極と、
前記半導体部の他面に設けられてあり、前記第1電極との間で前記半導体部に電圧を印加するための複数の第2電極とを備え、
前記複数の第2電極は、複数組の多重のループ状電極であり、
各組の多重のループ状電極は、順々に電位が変化するように電圧が印加される構成となっており、
各組の多重のループ状電極に囲まれる位置に、信号を出力するための電極を更に備えること
を特徴とする放射線検出器。 - 前記第1電極に連続しており、前記半導体部の内面を連続的に覆った第3電極を更に備えること
を特徴とする請求項1に記載の放射線検出器。 - 試料へ放射線を照射する照射部と、
請求項1又は2に記載の放射線検出器とを備え、
前記放射線検出器は、前記照射部から前記試料へ照射される放射線が貫通孔を通過し、前記試料から発生した放射線が半導体部の入射面に入射するように配置されていること
を特徴とする放射線検出装置。
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