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本文用石蜡模拟油垢,用60Co放射源的1.25M eV平均能量的γ射线垂直入射,以一定的散射角和不同的探测立体角接收散射γ光子数,发现散射γ计数与被测石蜡厚度之间存在不同的线性关系.结果发现,放射源与探测器之间屏蔽的好坏和合理的探测距离对提高线性度有很大关系.本实验测得最佳线性相关系数平方值为0.9981,平均测量精度为1.26mm.这对研究散射法检测油垢厚度和选择合适的探测距离提供了实验基础.
In this paper, paraffin wax was used to simulate the grease stain, and the γ-ray with the mean energy of 1.25M eV of 60Co radioactive source was incident perpendicularly. The scattering γ-photon number was received at a certain scattering angle and different detecting solid angle. There is a different linear relationship.The results show that the screening of radioactive sources and detector is good and reasonable detection distance to improve the linearity has a great relationship.The best linear correlation coefficient measured in this experiment is 0.9981 and the average measurement The accuracy is 1.26mm, which provides the experimental basis for the study of scattering method to detect the grease thickness and choose the proper detection distance.