Organ doses and effective doses were calculated using the EGS-4 Monte Carlo simulation code and a MIRD-5 mathematical human phantom placed in a vacuum. For broad right and left lateral beams of monoenergetic (0.1-200 MeV) electrons, conversion coefficients from the incident fluence to organ dose, to effective dose, and to effective dose equivalent were obtained. There were no clear differences between the conversion coefficients in the case of left-lateral and right-lateral irradiation. Therefore, when investigating lateral geometries for electron exposure, it is not necessary to evaluate both directions independently. In general, conversion coefficients for lateral irradiation (LAT) were smaller than those for AP and PA. The difference between the AP and PA conversion coefficients and LAT became smaller with increasing incident energy; at 200 MeV the conversion coefficients were almost independent of the irradiation geometry. The agreement between the results of the present study and those of other studies was acceptable within the statistical uncertainties.
器官剂量和有效剂量是通过
EGS-4 蒙特卡洛模拟代码和置于真空中的 MIRD-5 人体模型计算得出的。对于单能(0.1-200MeV)电子的右侧和左侧宽束,得到了从入射通量到器官剂量、有效剂量和有效剂量当量的转换系数。左侧照射和右侧照射的转换系数没有明显差异。因此,在研究电子照射的横向几何形状时,没有必要对两个方向进行独立评估。一般来说,侧面照射(
LAT)的转换系数小于AP和PA的转换系数。随着入射能量的增加,AP和PA转换系数与
LAT之间的差异也越来越小;在200 MeV时,转换系数几乎与辐照几何形状无关。在统计不确定性范围内,本研究结果与其他研究结果之间的一致性是可以接受的。