Gamma Radiography
Gamma rays are produced by a radioisotope.
A radioisotope has unstable nuclei that does not have enough binding energy to hold the nucleus together. The spontaneous breakdown of an atomic nucleus resulting in the release of energy and matter is known as radioactive decay. Most of the radioactive material used in industrial radiography is artificially produced.
This is done by subjecting stable material to a source of neutrons in a special nuclear reactor.
This process is called activation.
