1. Nuclear Professional School, University of Tokyo, 2-22, Shirakatashirane, Tokai, Ibaraki 319-1188, Japan
2. Department of Energy Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan
3. Shimadzu Corp., Kyoto, Kyoto 604-8511, Japan
4. Sekisui Medical Co., LTD., Tokai, Ibaraki 319-1112, Japan
5. PREST, Japan Science and Technology Agency (JST), Kawaguchi, Saitama 332-0012, Japan