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ZnS(Ag)シンチレーション検出器による$$alpha$$線波高弁別に関する検討; 汚染管理用機器への適用の可能性

Study on pulse height discrimination of alpha-ray using ZnS(Ag) scintillation detector; Adaptability to contamination monitoring equipments

井崎 賢二 ; 猪野 和生*; 水庭 春美

Izaki, Kenji; Ino, Kazuo*; Mizuniwa, Harumi

MOX燃料製造施設や再処理施設などプルトニウムを取り扱う施設においては、$$alpha$$線測定を主体とした汚染管理が行われる。$$alpha$$線測定の場合、天然放射性核種であるラドン子孫核種による影響を考慮する必要があり、これまで必要に応じて表面障壁型の半導体検出器を用いた波高弁別を活用することにより、ラドン子孫核種の影響低減化を図ってきた。今回、半導体検出器より耐久性や耐ノイズ性に優れたZnS(Ag)シンチレーション検出器について、波高弁別の精度を確認し、汚染管理用機器への適用の可能性について検討した。

The contamination control has been carried out by alpha-ray measurement in facilities where handling plutonium like the MOX fuel manufacturing facility and the reprocessing facility, etc. In the case of alpha-ray measurement, it is necessary to consider the influence of radon progeny that is natural radionuclide. The influence of radon progeny has been decreased by pulse height discrimination technique using the semiconductor detector as needed. However, the semiconductor detector has potentially significant problems such as the durability and noise susceptibility. Therefore the accuracy of pulse height discrimination by the ZnS(Ag) scintillation detector was confirmed as alternative to the semiconductor detector. This report shows the accuracy of pulse height discrimination technique using the ZnS(Ag) scintillation detector and evaluates the adaptability to contamination control equipments.

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