Chen Jing
Radiation Protection Bureau, Health Canada, 775 Brookfield Road, Ottawa, Canada K1A 1C1.
Radiat Prot Dosimetry. 2006;118(4):378-83. doi: 10.1093/rpd/nci378. Epub 2006 Feb 3.
In the literature, no conversion coefficients are available for use in radiological protection of embryo and foetus against external exposure to protons. This study used the Monte Carlo code MCNPX to determine mean absorbed doses to the embryo and foetus when the mother is exposed to proton fields. Monoenergetic protons ranging from 100 MeV to 100 GeV were considered. The irradiation geometries include antero-posterior (AP), postero-anterior (PA), lateral (LAT), rotational (ROT) and isotropic (ISO). At each of these standard irradiation geometries, absorbed doses to the foetal brain and body were calculated for the embryo of 8 weeks and the foetus of 3, 6 or 9 months. Proton fluence-to-absorbed dose conversion coefficients were derived for the four prenatal ages.
在文献中，没有可用于胚胎和胎儿外照射质子辐射防护的转换系数。本研究使用蒙特卡罗代码MCNPX来确定母亲暴露于质子场时胚胎和胎儿的平均吸收剂量。考虑了能量范围从100 MeV到100 GeV的单能质子。照射几何形状包括前后（AP）、后前（PA）、侧面（LAT）、旋转（ROT）和各向同性（ISO）。在这些标准照射几何形状中的每一种情况下，计算了8周胚胎以及3、6或9个月胎儿的胎儿脑部和身体的吸收剂量。得出了四个产前年龄的质子注量与吸收剂量转换系数。
