Evaluation of organ doses for external neutron irradiation by using adult Japanese phantoms with various body sizes

Sato, Kaoru   ; Satoh, Daiki   ; Takahashi, Fumiaki  ; Furuta, Takuya   

Organ doses, which are basis of dose assessment in radiation protection, are derived from ICRP phantoms (Male: RCP-AM, Female: RCP-AF) with body physiques of standard Caucasian. In adult, Japanese have small size body, compared with Caucasian. Considering the physiques of Japanese is very important, when organ doses of RCP-AM and RCP-AF are applicable for constructing of radiation protection standard in Japan. So far, we reported the dosimetric characteristics of adult Japanese with various body sizes, which were irradiated with photons. In this study, we analyzed the impact of body sizes on organ doses due to external neutron irradiation. In analysis, we utilized the male and female phantoms with 3 body physiques by changing busts, chests, waists and hips of JM-103 and JF-103. In rotational geometry at 3 MeV, it was found that colon doses of adult Japanese phantoms with body sizes, which are applicable to most adult Japanese, agreed with those of RCP-AM and RCP-AF within 20%.