Abstract
Studies were made on the gamma spectra obtained when a source of Cu/sup 64/ is measured at high and low geometries, both unshielded and encapsulated. An enhanced summing effect at high geometry with a large amount of scattering material present was observed. When the source is encapsulated in wax, the result is annihilation and scattering close to the source of the positrons emitted in all directions. Thus, the conditions are maximized for the production of a sum peak. The distribution of Compton electrons from scattering results in a sharp maximum corresponding to 180 deg scattering. (P.C.H.)
Published Version
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