convener:Kazuyuki Kita(Faculty of Science, Ibaraki University), Yuichi Onda(Center for Research on Isotopes and Environmental Dynamics, University of Tsukuba), SHINOHARA ATSUSHI(大阪大学, 共同), Daisuke Tsumune(Central Research Institute of Electric Power Industry), Chairperson:Wakiyama Yoshifumi(Institute of Environmental Radioacitivity, Fukushima Universiy), Ninomiya Kazuhiko(Graduate School of Science, Osaka University)