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Compact Compton camera for radiation distribution imaging under high dose rate environments

高線量率環境下における放射線分布測定のための小型コンプトンカメラの開発

佐藤 優樹  ; 寺阪 祐太   ; 冠城 雅晃   ; 谷藤 祐太 ; 宇佐美 博士; 宮村 浩子  ; 小澤 慎吾*; 和泉 良*; 川端 邦明   ; 鈴木 敏和*; 鳥居 建男  

Sato, Yuki; Terasaka, Yuta; Kaburagi, Masaaki; Tanifuji, Yuta; Usami, Hiroshi; Miyamura, Hiroko; Ozawa, Shingo*; Izumi, Ryo*; Kawabata, Kuniaki; Suzuki, Toshikazu*; Torii, Tatsuo

The development of quick radiation imaging methods in the high dose rate environments is very important to accelerate decommissioning of the Fukushima Daiichi Nuclear Power Station (FDNPS). We have developed a compact Compton camera for measurement of radioactive contamination inside FDNPS. We conducted a performance evaluation test inside the $$gamma$$-ray irradiation facility, and the Compton camera can visualize the $$^{137}$$Cs-irradiation source under the dose rate of 1 mGy/h. We also developed the remote radiation imaging system consisting of the Compton camera and a multicopter-type drone. The drone system succeeded in observing the $$^{137}$$Cs-radioactive source, which was set on the floor surface, remotely. We plan to use the Compton camera and the drone system inside the buildings of FDNPS.

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