Abstract: Using the cylinder-shaped paraffin to simulate grease stain in petroleum pipelines, the scattering experiments with 0. 662MeV γ-ray are performed to measure the response of grease stain thickness in pipeline full of oil or empty. For the empty cylinder-shaped paraffin, the scattered radiation intensity increases with the increasing thickness and shows a good linear sensitivity response which accords with the theoretical analysis. As the case of oil -containing paraffin cylinder, the scattered radiation intensity increases with the increasing thickness and tends to be stable;and there is good response still in the zone of small paraffin thickness.

Key words: γ-ray, scattering, paraffin, grease stain