*Atsuki Nagata¹, Hiroto Kajita², Hirofumi Tazoe³, Junpei Abo², Hinano Kusunose², Takuto Ando⁴, Takahiro Suzuki⁴, Masahiro Minowa⁵, Iroha Ono⁶, Hitoshi Hasegawa⁶, Aki Sakuma⁷, Asuka Yamaguchi⁸, Yoshiaki Suzuki⁹, Koji Umeda² (1.Graduate school of Sustainable Community Studies, Hirosaki University, 2.Graduate school of Science and Technology, Hirosaki University, 3.Institute of Radiation Emergency Medicine, Hirosaki University, 4.Graduate School of International Resource Sciences, Akita University, 5.Institute of Low Temperature Science, Hokkaido University, 6.Faculty of Science and Technology, Kochi University, 7.Department of Earth and Planetary Science, School of Science, the University of Tokyo, 8.Atomosphere and Ocean Research Institute, The University of Tokyo, 9.Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology)

*Ono Iroha¹, Hitoshi Hasegawa¹, Niiden Ichinnorov², Nagayoshi Katsuta³, Masafumi MURAYAMA¹, Masao IWAI¹, Asuka Yamaguchi⁴ (1.Kochi Univresity, 2.Mongolian Academy of Science, 3.Gifu Univresity, 4.University of Tokyo)