@misc{oai:repo.qst.go.jp:00062731,
 author = {Yonai, Shunsuke and Matsufuji, Naruhiro and Kanai, Tatsuaki and et.al and 米内 俊祐 and 松藤 成弘 and 金井 達明},
 month = {Sep},
 note = {We calculated the secondary neutrons produced in the phantom and the beam line devices during passive carbon-ion radiotherapy with the PHITS code and verified the calculation experimentally. The calculations with the PHITS code agree with the Bonner sphere system measurements within 35 % and the calculated ambient dose equivalents agree well with the measurements within 7 %. We confirmed that the PHITS code has potential ability to evaluate the neutron exposure in carbon-ion radiotherapy., The 5th KOREA-JAPAN Joint Meeting on Medical Physics},
 title = {Monte Carlo calculation of secondary neutrons in passive carbon-ion radiotherapy and its experimental verification},
 year = {2008}
}