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中文摘要：
通过对不同厚度样品的γ射线测量，得出波谱峰面积与样品厚度的关系，并通过相对测量和效率刻度测量方法，计算不同厚度样品在46．5、351．9、477．6、661．7keV能量下的探测效率。探测效率随样品厚度的变化较大，不同厚度样品的4种探测效率最大值平均为最小值的2．6倍。实验结果显示：探测效率随样品厚度增加而逐渐减小，呈现对数关系。随着能量的增加，对数关系减弱，线性关系增强。
英文摘要：
Detection efficiency of HPGe y spectrometer is an important performance and has a greater impact on radioactivity measurement results of soil samples. By measuring γ-rays from ^210Pb（46.5 keV）, ^214pb（351.9 keV）, ^7Be（477.6 keV） and ^137Cs（661.7 keV） in soil samples of 15-95 mm in thickness （solid angles of-100°- -60°）, the relationship were investigated between the sample thickness and the T-ray counts obtained by efficiency calibration or comparative measurements. The results showed that the detection efficiency decreases with increasing sample thicknesses, with the largest ratio （3.5） of maximum/minimum detection efficiency at 46.6 keV and the smallest （2.2） at 661.7 keV. The detection efficiency decrease at low energies was in a logarithm way, while at high energies the detection efficiency decreased linearly.
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