基于MCNP程序的铅屏蔽层对γ射线屏蔽性能研究.pdf

第 44 卷增刊 原 子 能 科 学 技 术 Vol. 44, Suppl. 2010 年 9 月 Atomic Energy Science and Technology Sep. 2010 基于 MCNP 程序的铅屏蔽层对γ射线 屏蔽性能研究 郭广水，曾心苗，周 鹏，秦培中，孟宪芳，王 强 （北京市射线应用研究中心，北京 100012 ） 摘要：为了计算不同厚度铅对不同能量 γ 射线的屏蔽性能，本工作建立了两种模型，然后使用 MCNP 程序对这两种模型进行模拟计算，进而得到了铅的屏蔽性能。计算结果表明：相同厚度的铅屏蔽层对 低能 γ 射线的屏蔽能力强于高能，随着 γ 射线能量的增大，屏蔽能力呈下降趋势。作为验证，本工作 计算了单向源、面源、各向同性面源情况下铅的屏蔽性能，还通过改变 PHYS 卡计算铅的屏蔽性能， 得到的结果与上述结论一致。 关键词：MCNP 程序；γ射线；衰减倍数；铅 中图分类号：TL818.4 文献标志码：A 文章编号：1000-6931 （2010 ）S0-0587-04 Study of Shielding Capability of γ-ray for Pb Shielding Floor Based on MCNP Program GUO Guang-shui，ZENG Xin-miao ，ZHOU Peng ，QIN Pei-zhong， MENG Xian-fang ，WANG Qiang （Beijing Research Center for Radiation Application , Beijing 100012, China） Abstract: For calculating the shielding capability of γ-ray with different energy for Pb shielding floor with different thickness, two models were conceived, then these models were simulated with MCNP program, and the Pb shielding capability was calculated and the conclusion was gained. The results show that the shielding capability of Pb shielding floor with the same thickness to low energy γ-ray is better than to high energy γ-ray, and the shielding capability line descends along with the γ-ray energy goes up. For validating this conclusion, the Pb shielding capability in the conditions of single direction γ-ray source, surface source, isotropy surface source and changing PHYS card were calculated, then the same conclusions were gained. Key