钨玻璃与铅玻璃对X射线辐射屏蔽效果的数值计算分析

摘要

The mass attenuation coefficients,effective atomic number and half-value layer of tungsten and lead silicate glasses have been theoretically calculated for X-rays photon energies of 20~100 keV by WINXCOM program.These results indicate that the total mass attenuation coefficients were increased by increasing WO3 and PbO concentration.Mass attenuation coefficient of tungsten glass suddenly increases at energy of 70 keV,due to the photoelectric had mutation.Subsequently,the build-up factor of tungsten glass has been calculationed by MCNP 5 at five kinds of energies,so that further amendments to the simulation results in order to achieve real situation.%通过 WINXCOM理论计算X射线能量在20~100 keV下，钨和铅硅酸盐玻璃的质量衰减系数、有效原子序数和半值层。结果发现，随着 WO3和PbO 含量的增加质量衰减系数增加。钨玻璃在70 keV能量下，由于光电效应发生突变，质量衰减系数突然增强。随后，利用 MCNP 5计算5种能量下钨玻璃的积累因子，以便进一步修正模拟结果以达到真实情况。