@article{oai:repo.qst.go.jp:00049546,
 author = {Jun, Kataoka (Waseda University) and Aya, Kishimoto (Waseda  University) and Takanori, Taya (Waseda University) and Saku, Mochizuki (Waseda University) and Leo, Tagawa (Waseda University) and Ayako, Koide (Waseda University) and Koki, Sueoka (Waseda University) and Hayato, Morita (Waseda University) and Takuya, Maruhashi (Waseda University) and Kazuya, Fujieda (Waseda University) and Kurihara, T. and Makoto, Arimoto (Waseda University) and Hiroshi, Okochi (Waseda University) and Naoya, Katsumi (Waseda University) and Shuntaro, Kinno (Waseda University) and Keiko, Matsunaga (Osaka University) and Hayato, Ikeda (Osaka University) and Eku, Shimosegawa (Osaka University) and Jun, Hatazawa (Osaka University) and Shinji, Ohsuka (Hamamatsu Photonics) and Toshiyuki, Toshito (Nagoya Proton Therapy Center) and Mitsuhiro, Kimura (Nagoya Proton Therapy Center) and Nagao, Yuuto and Yamaguchi, Mitsutaka and Kurita, Keisuke and Kawachi, Naoki and Nagao, Yuuto and Yamaguchi, Mitsutaka and Kurita, Keisuke and Kawachi, Naoki},
 journal = {Nuclear Instruments and Methods in Physics Research Section A},
 month = {Dec},
 note = {A multipixel photon counter (MPPC) features excellent photon-counting capability as a radiation detector. In particular, a two-plane Compton camera consisting of Ce:GAGG scintillators coupled with MPPC arrays has significant application potential owing to its compact size and low weight. For example, the camera can be easily mounted on a commercial drone to identify radiation hot spots from the sky. In Fukushima, we demonstrated that a Cs-137 distribution within a 100 m diameter can be mapped correctly within a couple of tens of minutes. The advanced use of the Compton camera is also anticipated in the field of proton therapy. We evaluated an image of 511 keV annihilation gamma-rays emitted from a PMMA phantom irradiated by 200 MeV protons to mimic an in-beam monitor for proton therapy. Finally, we developed an ultracompact Compton camera (weight = 580 g), for 3-D multicolor molecular imaging. In order to demonstrate the performance capabilities of the device, I-131 (365 keV) , Sr-85 (SrCl2, 514 keV), and Zn-65 (ZnCl2, 1116 keV) were injected into a living mouse and the data were taken from 12 angles with a total acquisition time of 2 h. We confirmed that all tracers had accumulated on the target organs of the thyroid, bone, and liver, and that the obtained 3-D image was quantitatively correct with an accuracy of ±20%.},
 pages = {1--5},
 title = {Ultracompact Compton Camera for Innovative Gamma-ray Imaging},
 volume = {912},
 year = {2018}
}