 Industrial Radiography uses either X-rays, produced with X-ray generators, or gamma rays generated by the natural radioactivity of sealed radionuclide sources.After crossing the specimen, photons are captured by a detector, such as a silver halide film, a phosphor plate or flat panel detector.The examination can be performed in static 2D (named radiography), in real time 2D, (fluoroscopy) or in 3D after image reconstruction (computed tomography or CT).