This paper proposes Compton backscatter technique as an additional alternative NDT tool for various measurements. When the radiation strikes material a small percentage of incident radiation scatters back with reduced energy. The backscattered radiation is picked up by a digital backscatter gauge and analysed. The paper discusses experimental work carried out at the laboratory consisting of parameter evaluation, source detector geometry, backscatter response for material, area effects, thickness and blockage measurements. The paper also discusses a few on-stream measurements carried out with the above experimental gauge. The paper deals with details of approach to the problem, selection and comparison of measurements with those of ultrasonics. It also discusses the advantages of the radiation backscatter testing. The paper recommends Com-scan backscatter technique as a supplementary tool along with conventional testing.