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本文介绍了测量矿井采煤工作面顶板残留煤皮厚度的方法，建立了天然γ射线穿过煤层的物理模型，用蒙特卡罗方法通过计算机模拟衰减过程获得不同的煤厚吸收曲线。并在实验室里做了大量的模拟实验获得了页岩表面γ辐射能谱和顶板岩中的天然γ射线穿过０～４０ｃｍ厚的精煤和原煤吸收曲线。得出的实验结果与计算机模拟获得的吸收曲线的变化规律是一致的。从理论上和实验中证明了天然γ射线穿过顶板不同煤皮厚度具有一定的衰减规律。为顶板煤皮厚度传感器的设计提供可靠的依据，为采煤机滚筒自动调整采高奠定一定的基础。
In this paper, the method of measuring the thickness of residual coal skin on the roof of coal mining face is introduced. The physical model of natural gamma ray passing through coal seam is established. Different coal thickness absorption curves are obtained by computer simulation of attenuation process by Monte Carlo method. And a large number of simulation experiments were done in the laboratory to obtain the γ radiation spectrum of shale surface and the natural γ rays passing through the top rock through the 0-40cm thick coal and coal absorption curve. The experimental results obtained are consistent with those obtained by computer simulation. It is proved theoretically and experimentally that the natural gamma ray has a certain decay rule through the roof of different coal skin thickness. It provides a reliable basis for the design of the roof coal skin thickness sensor and lays a certain foundation for the automatic adjustment of the shearer drum height.