Radiographic testing usually requires exposing film to X rays or gamma rays that have penetrated a specimen, processing the exposed film, and interpreting the resultant radiograph. There are many variables in these procedures and successful completion of any test is dependent upon understanding and control of the variables.
Radiography today is one of the most important, most versatile, of all the nondestructive test methods used by modern industry. Employing highly penetrating X-rays, gamma rays and other forms of radiation that do not damage the part, radiography provides a permanent visible film record of internal conditions, containing the basic information by which soundness can be determined.
Industrial radiography is tremendously versatile. Objects radiographed range in size from micro-miniature electronic parts to mammoth missile components; in product composition through virtually every known assemblies.
Radiographic examination has been applied to organic and inorganic materials, and to solids, liquids and even gases.