This technique involves the use of penetrating gamma or X-radiation to examine parts and products for imperfections.

​

An X-ray machine or radioactive isotope is used as a source of radiation. Radiation is directed through a part and onto film or other media. The resulting shadowgraph shows the internal soundness of the part.

​

Possible imperfections are indicated as density changes in the film in the same manner as an X-ray shows broken bones.