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中文摘要：
通过MCNP5（蒙特卡罗，MonteCarlo）和WINXCOM程序研究了在0．662MeV、1．17MeV和1．33MeV三种γ射线下铋玻璃的衰减系数，并与铅玻璃进行对比。根据衰减倍数K以及综合考虑材料屏蔽性能和机械性能后，材料可以选择含氧化铋含量为50％的铋玻璃。计算了^137Cs与^60Co源照射以及铋玻璃的厚度分别为2cm和10cm的水模体剂量率分布。结果反应出在适合的能量下，铋玻璃可能会替代铅玻璃作为防辐射玻璃。
英文摘要：
Currently, lead glass is widely used as observation window, while lead is toxic heavy metal Purpose： Non-toxic materials and their shielding effects are researched in order to find a new material to replace lead containing material. Methods： The mass attenuation coefficients of bismuth silicate glass were investigated with 7-ray＇s energy at 0.662 MeV, 1.17 MeV and 1.33 MeV, respectively, by MCNP 5 （Monte Carlo） and WINXCOM program, and compared with those of the lead glass. Results： With attenuation factor K, shielding and mechanical properties taken into consideration, bismuth glass containing 50% bismuth oxide might be selected as the right material. Dose rate distributions of water phantom were calculated with 2-cm and 10-cm thick glass, respectively, irradiated by ^137Cs and ^60Co in turn. Conclusion： Results show that the bismuth glass may replace lead glass for radiation shielding with appropriate energy.
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