土层对γ散射法测量油垢厚度影响的初步研究

Preliminary Studies on the Effect of Soil Layer on Measuring Grease Stain Thickness in Pipeline by γ Ray Scattering Method

利用由60Co源、NaI(Tl)探测器和微机多道谱仪等组成的实验装置,测量了油垢厚度的散射光子计数。同时应用蒙特卡罗模拟针对不同的土层厚度及土层中含水量检测油垢厚度的散射光子数。结果显示,随着土层厚度的增加,油垢厚度的探测灵敏度呈减小趋势,通过初步模拟发现,土层中含水量对检测油垢厚度的影响有一定的规律。

A set of scattering y ray photon counts corresponding to different grease stain thicknesses was obtained by using an experiment setup, which consists of a ^60Co γ radioactive source, a NaI（Tl） scintillation detector and a micro-computerized multi-channel spectrometer, etc. In addition, by using Monte-Carlo program with the similar geometry, scattering 7 ray photon for different grease stain thicknesses were obtained for different thickness of soil layer and different water content in the soil layer. The results showed that the sensitivity of measurement was decreased when the thickness of soil layer was increased, and moreover, the effect of water content in soil layer on measuring grease stain thickness was regular from the simulation results.