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

小平聡
小西輝昭
北村尚
内堀幸夫
Benton Eric

Publication date

February 2019

Abstract

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 partic...