Radiographic Inspection
Radiographic testing is used to detect internal defects in castings, welds or forgings by exposure to x-ray or gamma ray radiation. Both x-ray and gamma rays are forms of electro-magnetic radiation. Defects are detected by differences in radiation absorption in the material as seen on a shadow graph displayed on photographic film.
The basic principle of radiographic inspection of welds, castings or forgings is the same as that for medical radiography. Penetrating radiation is passed through a solid object onto a photographic film, resulting in an image of the object’s internal structure being deposited on the film. The amount of energy absorbed by the object depends on its thickness and density. Energy not absorbed by the object will cause exposure of the radiographic film. These areas will be dark when the film is developed. Areas of the film exposed to less energy remain lighter. Therefore, areas of the object where the thickness has been changed by discontinuities, such as porosity or cracks, will appear as dark outlines on the film. Inclusions of low density, such as slag, will appear as dark areas on the film while inclusions of high density, such as tungsten, will appear as light areas.
All discontinuities are detected by viewing shape and variation in density of the processed film.
Digital Radiography
Portable Digital CR System
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SITEX C3005 Portable X-Ray Generators
