2:00 PM - 2:15 PM
*Yuichi Kurihara1, Yoshio Takahashi1, Fan Qiaohui1, Keisuke Taniguchi2, Hikaru Miura1, Yuichi Onda3 (1.Department of Earth and Planetary Science, Graduate School of Science, The university of Tokyo, 2.Centre for Environmental Creation Fukushima Prefecture, 3.Center for Research on Isotopes and Environmental Dynamics, University of Tsukuba)