En自然γ铀矿测井LaBr_3晶体探测效率的MC模拟

Monte Carlo Simulation of LaBr_3 Crystal Detection Efficiency in Gamma-ray Uranium Logging

自然γ铀矿测井是通过测量地层中的天然放射性元素自发衰变产生的γ射线,得到铀矿含量信息的测井方法。论文利用MCNP5程序模拟不同孔径、不同地质层位的U、Th、K含量等条件下LaBr3探测器对自然γ射线的探测效率,得出最佳探测效率时,孔径与探测器几何形状关系,为自然γ探管探测器的设计提供参考。

Gamma uranium logging which gets uranium content information through the measurement of the gam -ma rays from natural radioactive elements spontaneously disintegrations , is one of the logging methods .In this thesis, the MCNP program is used to simulate the detection efficiency of LaBr 3 detector on the gamma-ray un-der various U , Th, K contents , borehole diameters and other conditions .And the relations of borehole diameter and the detector geometry are obtained under the optimum detection efficiency , as providing a reference for the design of gamma probe .