"' Angular Correlation of Electron Positron Annihilation Radiation ( ACAR or ACPAR ) "'is a technique of solid state physics to investigate the electronic structure of metals.
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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.
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Work by Gordon Brownell, Charles Burnham and their associates at the Massachusetts General Hospital beginning in the 1950s contributed significantly to the development of PET technology and included the first demonstration of annihilation radiation for medical imaging.
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A remarkable astrophysical prediction of the Chapline Laughlin theory is that dark energy stars should be prolific sources of positrons because nucleons decay when they encounter the surface of a dark energy star, which may explain the strong positron annihilation radiation observed coming from the central region of our galaxy.
