Industrial Radiography is one of the largest volume services we provide at Pro-Surve Technical Services, it is a nondestructi ... ve testing (NDT) method of inspecting materials for hidden flaws by using the ability of short wavelength electromagnetic radiation (high energy photons) to penetrate various materials. We use radioactive isotopes which produce gamma radiation in a controlled environment which exposes film and produces a negative image. This method can be used to judge the quality of welding as well as identifying erosion/corrosion wall loss in pressure and process equipment. read more