保温层对快中子检测油垢厚度响应的影响

利用快中子透射法和散射法研究了保温层厚度在0～72mm时对测量输油管道油垢厚度响应的影响。实验装置由中子束发射器、中子探测器和BH1224型微机多道谱仪组成。实验结果表明：在油垢厚度较小时，随着保温层厚度的增加，检测输油管道油垢的灵敏度减小，但对透射法的影响比散射法小；透射法中子计数适合于半对数进行线性拟合，R²的平均值为0.9958；散射法中子计数适合于二次多项式拟合，R²的平均值为0.9979。

Influence of Thermal Insulation Layer on Measuring Response of Grease Stain Thickness Using Fast Neutron

The influence of the thermal insulation layer with thickness changed from 0 mm to 72 mm on measuring response of grease stain thickness in oil pipeline using the fast neutron transmission method and scattering method was reported.The experimental device consists of the transmitter of neutron beam,detector of neutron and the BH1224 computer multi-channel analyzer.The experiment results show that the sensitivity of detection of pipeline grease stain falls with the increase of the thermal insulation layer,but the influence is smaller on transmission method than scattering method.The neutron counting number is suitable for linear fitting with semi-logarithmic on neutron transmission method and with quadratic polynomial on scattering method.The average of R2 is 0.995 8 and 0.997 9,respectively.