Annihilation radiation | definition of annihilation radiation by Medical dictionary
Also found in: Encyclopedia
the radiation resulting when a positron from beta-positive decay comes to rest. It encounters an electron, and the two particles annihilate each other and convert their rest mass into two 0.51-MeV gamma rays emitted in exactly opposite directions. See: pair production
References in periodicals archive
Although the source of the annihilation radiation
is debatable, there is no dearth of candidates in the crowded environs of the galactic center.
Matter falling onto such a compact object would produce low-energy gamma rays, which in turn would generate the positrons needed to produce the annihilation radiation