Radiographic test (RT)
Radiographic test (RT) is a technique used for volumetric flaw detection. Short wavelength electromagnetic radiation such as X-rays penetrate the through thickness of the component and on to photographic films placed on the other side of the component. The film gets exposed to varying levels of radiation depending on the thickness of the penetrated material, and forms the latent images. Discontinuities within the component also affects the amount of radiation received by the film. Exposed films are then processed in dark room and developed radiographic images are viewed on illuminated screen for interpretation.