Endo Akira, Sato Tatsuhiko
Japan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1195, Japan.
Radiat Prot Dosimetry. 2013 Apr;154(2):142-7. doi: 10.1093/rpd/ncs199. Epub 2012 Aug 19.
Absorbed doses, linear energy transfers (LETs) and quality factors of secondary charged particles in organs and tissues, generated via the interactions of the spontaneous fission neutrons from (252)Cf and (244)Pu within the human body, were studied using the Particle and Heavy Ion Transport Code System (PHITS) coupled with the ICRP Reference Phantom. Both the absorbed doses and the quality factors in target organs generally decrease with increasing distance from the source organ. The analysis of LET distributions of secondary charged particles led to the identification of the relationship between LET spectra and target-source organ locations. A comparison between human body-averaged mean quality factors and fluence-averaged radiation weighting factors showed that the current numerical conventions for the radiation weighting factors of neutrons, updated in ICRP103, and the quality factors for internal exposure are valid.
利用粒子与重离子传输代码系统（PHITS）并结合国际放射防护委员会（ICRP）参考人体模型，研究了人体内由（252）Cf和（244）Pu自发裂变中子相互作用产生的器官和组织中次级带电粒子的吸收剂量、线能量转移（LET）和品质因数。靶器官中的吸收剂量和品质因数通常都随着与源器官距离的增加而降低。对次级带电粒子LET分布的分析确定了LET能谱与靶-源器官位置之间的关系。人体平均平均品质因数与注量平均辐射权重因数之间的比较表明，ICRP103中更新的当前中子辐射权重因数数值约定以及内照射的品质因数是有效的。
