Source position effect in gamma-ray energy measurements with Ge(Li) detectors

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Abstract The source position effect for gamma-ray pulse heights was investigated with two planar and three coaxial Ge(Li) detectors at the gamma-ray energies of 303 keV, 512 keV and 1275 keV. The peak shift in the pulse height spectrum was measured as a function of the source-to-detector distance and of the source angle from the detector axis. A clear shift of the peak center was observed for the planar detectors, and a smaller shift for the coaxial detectors. It was found that the shift was almost independent of the bias voltage. These experimental results are difficult to explain by the field increment effect and the charge trapping effect in the detector. The rise time effect was not observed in any of the planar detectors.

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