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

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 -ray irradiation facility, and the Compton camera can visualize the 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 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.