3:30 PM - 3:45 PM
*Yukio Isozaki1, Yusuke Sawaki1, Hideki Iwano2, Takafumi Hirata3, Keitaro Kunugiza4 (1.Department of Earth Science and Astronomy, Graduate School of Arts and Sciences, The University of Tokyo, 2.Kyoto Fission-Track Co. Ltd. , 3.Geochemical Resaerch Center, The University of Tokyo, 4.Department of Human Development, Toyama University)