Simpkin D J
Department of Radiology, St. Luke's Medical Center, Milwaukee, Wisconsin 53215.
Health Phys. 1989 Feb;56(2):151-64. doi: 10.1097/00004032-198902000-00002.
A Monte Carlo calculation has been performed to determine the transmission of broad constant-potential x-ray beams through Pb, concrete, gypsum wallboard, steel and plate glass. The EGS4 code system was used with a simple broad-beam geometric model to generate exposure transmission curves for published 70, 100, 120 and 140-kVcp x-ray spectra. These curves are compared to measured three-phase generated x-ray transmission data in the literature and found to be reasonable. For calculation ease the data are fit to an equation previously shown to describe such curves quite well. These calculated transmission data are then used to create three-phase shielding tables for Pb and concrete, as well as other materials not available in Report No. 49 of the NCRP.
已进行了蒙特卡罗计算，以确定宽恒压X射线束透过铅、混凝土、石膏墙板、钢和平板玻璃的透射情况。使用EGS4代码系统和简单的宽束几何模型，针对已发表的70、100、120和140 kVcp X射线光谱生成曝光透射曲线。将这些曲线与文献中测量的三相产生的X射线透射数据进行比较，发现结果合理。为便于计算，将数据拟合到一个先前已证明能很好描述此类曲线的方程。然后，这些计算得到的透射数据被用于创建铅和混凝土以及NCRP第49号报告中未提供的其他材料的三相屏蔽表。
