Radiographic Testing is possible with source, object & recording medium.

Source: Either X-ray or gamma rays (Ir-192, Co-60, Cs-137 etc.)

Object: Piping /Pressure Vessel/Storage tanks welding, Casting etc.

Recording Medium: Industrial Radiography films

The beam of radiation must be directed to the middle of the section under examination and must be normal to the material surface at that point except in special techniques where known defects are best revealed by a different alignment of the beam. The specimen to be inspected is placed between the source of radiation and the detecting device, usually the film in a light tight holder or cassette, and the radiation is allowed to penetrate the part for the required length of time to be adequately recorded.

The result is a two-dimensional projection of the part onto the film, producing a latent image of varying densities according to the amount of radiation reaching each area. Recorded latent image can be visible after development. The radiograph is examined as a negative, without printing as a positive as in photography.