[Tan, Yanliang] Hengyang Normal Univ, Coll Phys & Elect Engn, Hengyang, Hunan, Peoples R China.
[Sorimachi, Atsuyuki; Ishikawa, Tetsuo] Fukushima Med Univ, Fukushima, Japan.
[Janik, Miroslaw] Natl Inst Radiol Sci, Regulatory Sci Res Program, Chiba 260, Japan.
[Tokonami, Shinji] Hirosaki Univ, Inst Radiat Emergency Med, Dept Radiat Phys, Hirosaki, Aomori, Japan.
[Hosoda, Masahiro] Hirosaki Univ, Grad Sch Hlth Sci, Hirosaki, Aomori, Japan.