*Natsuki Tokunaga¹, Yusuke Uchiyama¹, Daisuke Tsumune², Masatoshi Yamada⁵, Yutaka Tateda², Yukari Ito³, Takashi Ishimaru³, Yutaka Watanabe⁷, Ken Ikehara⁴, Miho Fukuda⁶ (1.Kobe University, 2.Central Research Institute of Electric Power Industry, 3.Tokyo University of Marine Science and Technology, 4.National Institute of Advanced Industrial Science and Technology, 5.Hirosaki University, 6.National Institute of Radiological Sciences, 7.Hokkaido University)

*Daisuke Tsumune¹, Tsubono Takaki¹, Kazuhiro Misumi¹, Yutaka Tateda¹, Yuichi Onda², Michio Aoyama³ (1.Central Research Institute of Electric Power Industry, 2.Center for Research in Isotopes and Environmental Dynamics, University of Tsukuba, 3.Institute of Environmental Radioactivity, Fukushima University)