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Development of a Si-PM based alpha camera for plutonium detection in nuclear fuel facilities

核燃料施設でのプルトニウム検出を目的とした、Si-PMをベースとしたアルファカメラの開発

森下 祐樹   ; 山本 誠一*; 井崎 賢二 ; 金子 純一* ; 東井 宏平*; 坪田 陽一*

Morishita, Yuki; Yamamoto, Seiichi*; Izaki, Kenji; Kaneko, Junichi*; Toi, Kohei*; Tsubota, Yoichi*

Monitoring of alpha-ray is used for detecting a nuclear fuel material (i.e. plutonium and uranium) in nuclear fuel facilities. Currently for monitoring of airborne contamination of nuclear fuel, only energy information measured by Si semiconductor detector is used to distinguish nuclear fuel material from radon daughters. In some cases, however, it is difficult to distinguish when the radon concentration is high (e.g. ventilation of rooms is poor). In addition Si semiconductor detector is generally sensitive to noise. In this study, we developed new alpha-ray imaging system by combining Si-PM array, which is insensitive to noise, with Ce-doped Gd$$_{3}$$Al$$_{2}$$Ga$$_{3}$$O$$_{12}$$ (GAGG:Ce) scintillator and evaluated basic performance of the developed system. Thickness of the scintillator was 0.1 mm and the light guide was 3.0 mm. An $$^{241}$$Am source was used for all measurement. The spatial resolution was evaluated by taking an image of a resolution chart.

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