Abstract
Shifts in the apparent energy of peaks in gamma-ray spectra from Ge(Li) detectors have been measured as a function of the source-detector geometry for several detectors. For a planar detector, the change in the apparent peak energy was measured between gamma rays entering parallel and perpendicular to the electric field. With a bias of was observed for a 2500 keV gamma ray. For a planar and five coaxial detectors, the shift in peak energy was measured as a function of the source-detector distance. For a gamma ray of 1500 keV, the shifts were from >100 eV to −90 eV for the six detectors in going from a source-detector distance of 35 cm to 1 cm. The larger of these shifts could introduce significant systematic errors in precise gamma-ray energy difference measurements. This effect is presumed to result from (1) the acceleration of electrons due to the detector bias and (2) variation in the charge collection efficiency over the detector volume.
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