*Akari Fukuda¹, Ayaka Tokumaru¹, Mariko Kouduka¹, Hiroki Suga², Shingo Kato³, Yoshio Takahashi¹, Katsuhiko Suzuki⁴, Akira Usui⁵, Hiroki Mukai⁶, Naotaka Tomioka⁷, Masaki Oura⁸, Motoo Ito⁷, Yohey Suzuki¹ (1.The University of Tokyo, 2.Japan Synchrotron Radiation Research Institute, 3.RIKEN, 4.Submarine Resources Research Center, Japan Agency for Marine-Earth Science and Technology, 5.Marine Core Research Center, Kochi University, 6.Nuclear Regulation Authority, 7.Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, 8.RIKEN SPring-8 Center)

*Akira Usui¹, Hiroshi Kawahata ⁴, Kyoko Yamaoka², Teruhiko Kashiwabara³, Hikari Hino⁴ (1.Marine Core Research Institute, Kochi University, 2.Advanced Institute for Science and Techonlogy, 3.Japan Agency for Marine and Earth Science and Techonology, 4.Kochi University)

*li WENSHUAI¹, Yoshio Takahashi¹, Akira Usui², Ryoichi Nakada³, Teruhiko Kashiwabara⁴, Hajime Obata⁵, Naoya Kanna⁵, Yoshihiro Asahara⁶, Hirofumi Tazoe⁷, Masato Tanaka¹ (1.Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo, Japan. , 2.Center for Advanced Marine Core Research, Kochi University, Kochi, Japan. , 3.Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Kochi, Japan. , 4.Submarine Resources Research Center (SRRC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan. , 5.Atmosphere and Ocean Research Institute, The University of Tokyo, Japan. , 6.Department of Earth and Environmental Sciences, Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan. , 7. Institute of Radiation Emergency Medicine, Hirosaki University, Honcho, Hirosaki, Aomori, Japan)

*Makoto Miyajima¹, Shingo Kato^2,3, Katsuhiko Suzuki³, Akira Usui⁴, Tomoyo Okumura⁴ (1.Kochi University, 2.RIKEN, 3.JAMSTEC, 4.MaCRI, Kochi University)