The influence of different aggregates on the shielding performance of concrete is investigated in this paper.MCNP5 is used to simulate the emission of γ-ray with energy of 0.662MeV from 137Cs through concrete specimens with different aggregates and then acquired the emission spectra,attenuation coefficient,transmittance as well as half-attenuation thickness,which are verified by the γ-ray shielding experiment.The results show that the maximum relative error of the line attenuation coefficient is only 3.17％ between the MCNP5 simulation calculation and the experimental data,and it is feasible for simulating the shielding properties of different aggregate concrete with Monte Carlo Method.The results provide a simulation test support for the exploration of concrete shielding performance and have important guiding significance for future research on new type of shielded concrete aggregate.%为研究不同骨料对混凝土的屏蔽性能的影响,利用MCNP5模拟137Cs源放出能量为0.662MeV的γ射线穿过不同骨料的混凝土试块,得出出射能谱、线衰减系数、透射率及半衰减厚度,并利用γ射线屏蔽实验进行了验证.结果表明:MCNP5模拟计算的线衰减系数和实验测得的数据最大相对误差仅为3.17％,说明MC法模拟不同骨料混凝土屏蔽性能是可行的.结果为混凝土屏蔽性能的探索提供了模拟试验支持并对以后新型屏蔽混凝土骨料的研究具有重要指导意义.
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