1. Environmental Research Department, Tohoku Ryokka Kankyohozen Co., Ltd.
2. Research Institute of Science for Safety and Sustainability, National Institute of Advanced Industrial Science and Technology
3. Environmental Survey and Natural Resources Survey Department, Engineering Division, Mitsubishi Materials Techno Corporation
4. Research Institute for Geo-Resources and Environment, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology
5. Mineral Resources Department, Mitsubishi Materials Corporation