中文摘要：

利用由中子束发射器、中子探测器和BH1224型微机多道谱仪组成实验装置,研究了采用同一轴线法检测油垢（聚乙烯模拟）厚度时不同散射角对散射中子计数的响应关系,另外利用MCNP/4C程序模拟了采用同一横截面法中不同散射角时中子计数与油垢厚度响应关系。结果显示,采用同一横截面法检测油垢厚度优于同一轴线法,大散射角优于小散射角,90°散射角在油垢测量中不应采用。同一横截面法中R^2和测量精度的平均值分别为0.9954和0.526mm。

英文摘要：

Response of neutron counts with different scattering angle on method of same axis was researched on measuring grease stain（polyethylene simulated）thickness using the experimental device which consists of the transmitter of neutron beam,detector of neutron,and the BH1224 compute multi-channel.In addition,by using MCNP/4C program the response of scattering counts was simulated with different scattering angle on method of same cross section.The result showed that using same cross section is more superior than using same axis, large scattering angle is better than the small scattering angle;90 scattering angle should not be used during measuring grease stain thickness.The average of R^2 and accuracy was 0.9954 and 0.526 mm.