1. JHPS Working Group for Plutonium Accident in JAEA-Oarai
2. Japan Nuclear Safety Institute
3. Radiation Safety Research Center, Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry
4. Isotope Science Center, The University of Tokyo
5. Atomic Energy Research Institute, Kindai University
6. Environmental Health Science Division, Department of Health Sciences, Oita University of Nursing and Health Sciences