同衬底材料时，模拟产生的反散射峰与全能峰计数比例、不同材料的饱和厚度值，与实验结果一致. 本文还模拟了反散射峰计

数随着闪烁体包装材料的厚度，以及闪烁体的长度、横截面积和体积的变化关系，找到了抑制由此产生反散射峰本底的方法.

counts are simulated by the Code of Geant4 and the variable separation method. When using different substrate materials，

the ratio between the backscattering peak and full-energy peak counts，as well as the simulated saturation

thicknesses of different materials are in agreement with the experimental results. The backscattering peak counts as

functions of the thickness of scintillator packaging material，as well as the length，the cross-sectional area and the

volume of scintillator are also simulated，and the method to suppress the backscattering peak background is found.