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. Radiographic applications fall into two distinct
categories evaluation of material properties and evaluation of manufacturing
and assembly properties. Material property evaluation includes the
determination of composition, density, uniformity, and cell or particle size.
Manufacturing and assembly property evaluation is normally concerned with
dimensions, flaws (voids, inclusions, and cracks), bond integrity (welds,
brazes, etc.), and verification of proper assembly of component pieces.