中文摘要：

用石蜡模拟油垢，^60Co放射源的平均能量为1．25MeV的γ射线近水平入射，以一定的散射角接收散射γ光子数，发现散射γ计数与被测石蜡厚度之间存在线性关系。本实验测得石蜡厚度的最佳测量灵敏度为1181／mm,其线性相关系数为0．9909。

英文摘要：

Paraffin layers under a steel plate were used to simulate oil crust in pipelines by detecting scattered γ-rays in different solid angles from a ^60Co source, which irradiated the specimen in quasi-parallel incidence. A linear relationship was obtained between the counting rates of the scattering γ-rays and the paraffin thickness. The best sensitivity of measurement is 1181/mm, with the linearitv coefficient of 0.9909