The objective of this technique is to provide 'snapshots' used directly on the inside of materials. As with all non-destructive testing methods, radiography requires significant expertise, both in terms of operating conditions as that of the interpretation of results.
Its principle is based on the phenomenon of absorption of X-rays through the material. Indeed, this technique uses the penetrating power of X-rays in the material since the intensity of the incident rays is thus altered during its passage through the bushing material (differential absorption).
This produces a grayscale representation, projected on a plane, which allows to highlight the internal components of the crossing structure and detect imperfections of a material or assembly.