1. Faculty of Geo-Environmental Science, Rissho University, Kumagaya, Saitama, Japan
2. Institute of Science and Engineering, Kanazawa University, Kanazawa, Ishikawa, Japan
3. Japan Synchrotron Radiation Research Institute, Sayo, Hyogo, Japan
4. Fukada Salvage & Marine Works Co., Ltd., Tokyo, Japan
5. Research Institute for Marine Resources Utilization, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa, Japan
6. Ibaraki College, National Institute of Technology, Hitachinaka, Ibaraki, Japan