The Industrial radiography is similar to the medical radiography. It consists in crossing the piece to be inspected by a beam of X-rays (or gamma), and irradiating a film placed behind the piece.

X-ray and radiography control makes it possible to obtain an image of the material density of an object by X or gamma electromagnetic radiation.

The radiographic control by ionizing rays makes it possible to detect compactness (internal) defects which are often very fine (cracks, blows, inclusions, lack of bonding, lack of fusion, etc.). This control is carried out either using a radioactive source Y, or by an X-ray emitting station.