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小型CZT晶体的尺寸是3mm×3mm×1.5mm,为了得到其对662keVγ射线的本征探测效率,假定点源向4π方向发射662keV的γ射线,其示意图如图1所示。图1中,CZT晶体朝向γ射线点源面的尺寸为3mm×1.5mm,在这个方向上,CZT晶体的厚度为3mm。首先计算了CZT晶体对662keVγ射线的探测效率,再计算了打到CZT晶体表面γ射线的数量,
The size of a small CZT crystal is 3 mm × 3 mm × 1.5 mm. To obtain its intrinsic detection efficiency for 662 keV gamma rays, it is assumed that the point source emits 662 keV gamma rays in the 4π direction, as shown in FIG. 1. In Fig. 1, the size of the CZT crystal toward the gamma-ray point source plane is 3 mm × 1.5 mm, and in this direction, the thickness of the CZT crystal is 3 mm. Firstly, the detection efficiency of 662 keV gamma rays by CZT crystal was calculated, then the number of gamma rays striking the surface of CZT crystal was calculated,