Annihilation radiation is not monoenergetic, unlike gamma rays produced by radioactive decay. The production mechanism of annihilation radiation introduces Doppler broadening. The annihilation peak produced in a gamma spectrum by annihilation radiation therefore has a higher full width at half maximum (FWHM) than other gamma rays in spectrum. The difference is more apparent with high resolution detectors, 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.
Agency Reviews Patent Application Approval Request for "Sectional Radiographic Apparatus for Breast Examination"
Apr 11, 2013; By a News Reporter-Staff News Editor at Politics & Government Week -- A patent application by the inventors Tonami, Hiromichi...