1. Nuclear Engineering Research Collaboration Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
2. Fusion Research and Development Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
3. Oarai Research Laboratory, Chiyoda Technol Cooperation, Oarai, Ibaraki 311-1313, Japan
4. Radiation Source Production Group, Chiyoda Technol Cooperation, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
5. Chiyoda Technol Cooperation, Bunkyou, Tokyo 113-8681, Japan
6. Research Department, FUJIFILM RI Pharma Co., Ltd., Sammu, Chiba 289-1592, Japan