Radiography testing (RT) is the method of inspecting materials for hidden flaws by using the capability of short wavelength electromagnetic radiation , X-rays and gamma rays radiation to penetrate various materials. Gamma rays radiation sources, most commonly iridium-192 and cobalt-60 are used to inspect a variety of materials.The vast majority of radiography concerns the testing and grading of welds on pressurized piping, pressure vessels, high capacity storage containers, pipelines, and some structural welds.Other tested material include concrete (locating Rebar or conduit) welder’s test coupons, machined part ,plate  metal or pipewall (locating anomalies due to corrosion or mechanical damage) .Theoricall , industrial radiographer could radiograph any solid, flat material (walls, ceilings, floors, square or rectangular containers) or any hollow cylindrical or spherical object.