About the Authors

Yohey Suzuki

Contributed equally to this work with: Yohey Suzuki, Uta Konno

yohey-suzuki@eps.s.u-tokyo.ac.jp

Affiliations Graduate School of Science, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033, Japan, Geological Survey of Japan, Advanced Industrial Science and Technology, Higashi 1-1-1, Tsukuba, Ibaraki 305-8567, Japan

Uta Konno

Contributed equally to this work with: Yohey Suzuki, Uta Konno

Affiliation Geological Survey of Japan, Advanced Industrial Science and Technology, Higashi 1-1-1, Tsukuba, Ibaraki 305-8567, Japan

Akari Fukuda

Affiliations Geological Survey of Japan, Advanced Industrial Science and Technology, Higashi 1-1-1, Tsukuba, Ibaraki 305-8567, Japan, Japan Atomic Energy Agency, 1-64 Yamanouchi, Akiyo-cho, Mizunami, Gifu 509-6132, Japan

Daisuke D. Komatsu

Affiliation Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan

Akinari Hirota

Affiliation Geological Survey of Japan, Advanced Industrial Science and Technology, Higashi 1-1-1, Tsukuba, Ibaraki 305-8567, Japan

Katsuaki Watanabe

Affiliation Graduate School of Science, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo 113-0033, Japan

Yoko Togo

Affiliation Geological Survey of Japan, Advanced Industrial Science and Technology, Higashi 1-1-1, Tsukuba, Ibaraki 305-8567, Japan

Noritoshi Morikawa

Affiliation Geological Survey of Japan, Advanced Industrial Science and Technology, Higashi 1-1-1, Tsukuba, Ibaraki 305-8567, Japan

Hiroki Hagiwara

Affiliation Japan Atomic Energy Agency, 1-64 Yamanouchi, Akiyo-cho, Mizunami, Gifu 509-6132, Japan

Daisuke Aosai

Affiliation Japan Atomic Energy Agency, 1-64 Yamanouchi, Akiyo-cho, Mizunami, Gifu 509-6132, Japan

Teruki Iwatsuki

Affiliation Japan Atomic Energy Agency, 1-64 Yamanouchi, Akiyo-cho, Mizunami, Gifu 509-6132, Japan

Urumu Tsunogai

Affiliation Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan

Seiya Nagao

Affiliation Low Level Radioactivity Laboratory, Kanazawa University, 24, Wake, Nomi, Ishikawa 923-1224, Japan

Kazumasa Ito

Affiliation Geological Survey of Japan, Advanced Industrial Science and Technology, Higashi 1-1-1, Tsukuba, Ibaraki 305-8567, Japan

Takashi Mizuno

Affiliation Japan Atomic Energy Agency, 1-64 Yamanouchi, Akiyo-cho, Mizunami, Gifu 509-6132, Japan

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YS UK KI TM. Performed the experiments: YS UK AF DDK AH KW YT NM HH DA TI UT SN TM. Analyzed the data: YS UK. Contributed reagents/materials/analysis tools: AF HH DA TI TM. Wrote the paper: YS UK.

helloThese authors contributed equally to this work.