[1] Hanyang Univ, Dept Nucl Engn, 222 Wangsimni Ro, Seoul 04763, South Korea
[2] Korea Atom Energy Res Inst, Neutron Utilizat Technol Div, 111 Daedeok Daero 989beon Gil, Daejeon 34057, South Korea
[3] Samsung Med Ctr, Radiat Oncol, 81 Irwon Ro, Seoul 06351, South Korea
[4] Korean Inst Radiol & Med Sci, Heavy Ion Clin Res Div, Seoul 01812, South Korea