JP2013238533A - 半導体放射線検出器およびそれを用いた核医学診断装置 - Google Patents
半導体放射線検出器およびそれを用いた核医学診断装置 Download PDFInfo
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Abstract
【解決手段】半導体放射線検出器101は、カソード電極112およびアノード電極113で挟まれる半導体結晶111を用いてなる。半導体結晶111は、不純物としての鉛の濃度が0.1ppm未満である臭化タリウムの単結晶で構成されている。臭化タリウム単結晶中の鉛原子の濃度が小さいので、タリウム原子に対して鉛原子が置換してできる結晶中の欠陥の密度が小さくなり、電荷キャリアの捕獲長を長くできるので、放射線検出器として、高いエネルギー分解能で122keVおよび662keVのγ線エネルギースペクトルを計測することができる。
【選択図】図1
Description
最初に、図1を用いて、本実施形態による半導体放射線検出器の構成について説明する。
図1は、本発明の一実施形態による半導体放射線検出器の構成図である。図1(a)は斜視図であり、図1(b)は断面図である。
図2は、本発明の一実施形態による半導体放射線検出器に用いる半導体結晶の不純物としての鉛濃度の説明図である。
図3は、本発明の一実施形態による半導体放射線検出器に用いて放射線計測を行う場合の回路構成を示す回路図である。
図4は、本発明の一実施形態による半導体放射線検出器に印加されるバイアス電圧の時間変化の説明図である。
図5及び図6は、本発明の一実施形態による半導体放射線検出器を用いて計測したγ線エネルギースペクトルの説明図である。
図5(a)においては、122keVのエネルギー分解能は略8%であり、図5(b)においては122keVのエネルギー分解能は略5%である。
図7及び図8は、本発明の一実施形態による半導体放射線検出器を用いた核医学診断装置の構成図である。
32…データ処理装置
33…表示装置
101…半導体放射線検出器(検出器)
111…半導体結晶
112…第1電極
113…第2電極
311…第1直流電源
312…第2直流電源
313,314…保護抵抗器
315…第1フォトモスリレー
316…第2フォトモスリレー
317…スイッチ制御装置
318…第1定電流ダイオード
319…第2定電流ダイオード
320…平滑コンデンサ
321…ブリーダ抵抗器
322…結合コンデンサ
323…増幅器
324…極性統合制御装置
361…定電流装置
600…SPECT撮像装置
601A,601B…放射線検出ブロック
602,702…計測領域
603,703…画像情報作成装置
606…回転支持台
611…放射線計測ユニット
612…基板
613…遮光・電磁シールド
614…コリメータ
615…ユニット支持部材
700…PET撮像装置
701…撮像装置
D…集積部
H…被検体
K…コリメータで仕切られる領域
P…基板
Claims (5)
- カソード電極およびアノード電極で挟まれる半導体結晶を用いてなる半導体放射線検出器であって、
前記半導体結晶は、不純物としての鉛の濃度が0.1ppm未満である臭化タリウムの単結晶で構成されていることを特徴とする半導体放射線検出器。 - 請求項1記載の半導体放射線検出器において、
前記カソード電極および前記アノード電極を金,白金,パラジウムのうちの少なくとも一つ以上の金属で構成したことを特徴とする半導体放射線検出器。 - カソード電極およびアノード電極で挟まれる半導体結晶を用いてなる半導体放射線検出器であって、
前記半導体結晶は、不純物としての鉛の濃度がグロー放電質量分析(GDMS)による鉛濃度の検出限界以下である臭化タリウムの単結晶で構成されていることを特徴とする半導体放射線検出器。 - カソード電極およびアノード電極で挟まれる半導体結晶を用いてなる半導体放射線検出器であって、
前記半導体結晶は、不純物としての鉛の濃度が0.0ppmである臭化タリウムの単結晶で構成されていることを特徴とする半導体放射線検出器。 - 複数の前記半導体放射線検出器が取り付けられるとともに、被検体を支持するベッドが挿入される計測領域を取り囲み、前記計測領域の周囲に配置された基板と、
前記基板の前記複数の半導体放射線検出器から出力された放射線検出信号を基に得られた情報を用いて画像を生成する画像情報作成装置とを備え、
前記半導体放射線検出器が、請求項1,請求項3若しくは請求項4のいずれかに記載の半導体放射線検出器であることを特徴とする核医学診断装置。
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JP2018009801A (ja) * | 2016-07-11 | 2018-01-18 | 浜松ホトニクス株式会社 | 放射線検出器 |
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