4:25 PM - 4:40 PM
*Yamaguchi Akiko1, Yuichi Kurihara1, Kazuya Tanaka2, Yoshiyuki Obara3, Naohumi Kouzai2, Yoshio Takahashi1 (1.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 2.Advanced Science Research Center, Japan Atomic Energy Agency, 3.Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency)