@misc{oai:repo.qst.go.jp:00065648,
 author = {小平, 聡 and 小西, 輝昭 and 北村, 尚 and 内堀, 幸夫 and Benton, Eric and 小平 聡 and 小西 輝昭 and 北村 尚 and 内堀 幸夫 and Ｂｅｎｔｏｎ Ｅｒｉｃ},
 month = {Apr},
 note = {In addition to energy loss bay ionization process, protons of energy >~50
 MeV, such as those used in proton radiotherapy, can undergo nuclear interactions with nuclei of Z >1, resulting in the production of short range (<10 μm), high-LET (liner energy transfer) target fragment particles. One of the few methods to detect these short-range particles is by means of CR-39 plastic nuclear track detector analyzed with an atomic force microscope. However, doe to the LET-dependent angular sensitivity of CR-39, multiple detectors exposed at a range of incident angles to the primary proton beam, must be analyzed in order accurately detemine the LET spectrum, absorbed dose and dose equivalent. The LET spectrum of 160MeV proton induced secondary particles was exprrimentally measured with CE-39, which were exposed at six different incident angles to take into account the intrinsic sensitivity of the critical angle for track registration. The irradiated detectors were chemically processed to remove a 1 μm thick volume of CR-39, The measured LET range of short range tracks was from 15keV/μm up to 1.5MeV/μm. The absorbed dose contribution (Ds/Dp) from secondary particles to primary proton dose was ~1%, while the dose equivalent contribution (Hs/Dp) was found to be ~20%., 平成26年度HIMAC共同利用研究成果発表会},
 title = {CR-39を用いた高エネルギー荷電粒子が人体内中に生成する短飛程二次粒子の線量寄与の研究},
 year = {2015}
}