[1] China Acad Engn Phys, Inst Nucl Phys & Chem, Mianyang 621900, Peoples R China
[2] Natl Inst Quantum & Radiol Sci & Technol, Fukushima Project Headquarters, Natl Inst Radiol Sci, Inage Ku, Anagawa 4-9-1, Chiba 2638555, Japan
[3] Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China
[4] Leibniz Univ Hannover, Inst Radioecol & Radiat Protect, D-30419 Hannover, Germany
[5] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85201 USA
[6] Chuo Univ, Fac Sci & Engn, Dept Appl Chem, Bunkyo Ku, 1-13-27 Kasuga, Tokyo 1128551, Japan