1. Center for Water Cycle, Marine Environment and Disaster Mitigation, Kumamoto University
2. Faculty of Science, Niigata University
3. Docon Co. Ltd.
4. Research Institute of Geology and Geoinformation, Geological Survey of Japan, AIST
5. Kyoto Fission-Track Co. Ltd.
6. Geochemical Research Center, Graduate School of Science, The University of Tokyo