The efficiency of three different samples calculated by Monte Carlo was discussed. In these efficiency simulation of each sample includes three different highth and each hingth includes fifteen different energy. Based on these efficiency, the paper calculates self - absorption factors and test the self - absorption factors of two different matrix of soil and iron ore in low energy region by experimental method.%用蒙特卡罗方法模拟计算了三种不同基质样品的效率,每种基质的样品计算了三种不同的样品高度,每个高度计算了15个不同能量处的效率,由效率计算出了自吸收因子,并用实验的方法验证了土壤和铁矿石两种基质在低能区的自吸收因子.
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