Annihilation radiation such as Germanium detectors, than with low resolution detectors such as Sodium iodide detectors. Because of their well-defined energy (511 keV) and characteristic, Doppler-broadened shape, annihilation radiation can often be useful in defining the energy calibration of a gamma ray spectrum. Annihilation radiation Annihilation radiation is a term used in Gamma spectroscopy for the gamma radiation produced when a particle and its antiparticle collide and annihilate. Most commonly, this refers to 511-keV gamma rays produced by a normal (negative) electron colliding with a positron. Annihilation radiation is not monoenergetic, unlike gamma rays produced by radioactive decay. The production mechanism of
All About Radiation who has made a special study of radiation and its effects. He said that Hubbard's knowledge of radiation, as displayed by his writings in "All About Radiation", was the 'sort of knowledge that perhaps a boy who has read Intermediate Physics might, with a lot of misapprehensions and lack of understanding, demonstrate'... From this witness's evidence it is apparent that Hubbard is completely incompetent to deal with the subject of radiation and that his knowledge of nuclear physics is distorted, inaccurate, mistaken and negligible. No evidence was called which disputed in any way these conclusions." All About Radiation All About