为了研究在分段γ测量技术中被测废物桶内放射源能量的大小和桶内覆盖物吸收之间的关系.采用蒙特卡罗方法模拟了桶内放射源分别为241Am和137Cs,在不同位置时,对密度分别为0.872和0.126 g/cm3两种介质吸收的关系.通过对MCNP模拟数据分析可得,在利用分段γ测量技术测量核废物桶时,桶内能量高的射线,覆盖物的吸收影响小于能量低的射线.因此,对于发射低能射线的桶装废物进行非破坏检测时,由桶内覆盖物和放射源的分布不均引起的测量误差较大.%In order to study the relationship between the material absorption in the segmented γ measurement techniques, this article uses the Monte Carlo method to simulate when the sources is 241 Am and 137Cs which in the barrel,the effect to the material which density is 0. 872g/cm-3 and 0. 126g/cm-3 relationship, to through the MCNP simulation data, we can concluded: to the high - energy rays, the medium absorption effect is less than the low energy of the ray, so launch of barrels of waste of low - energy - ray non - destructive testing, the measurement error caused by the density and distribution of source.
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