Abstract
A computer program calculation for the determination of the finite solid-angle corrections, for truly coaxial Ge(Li) detectors, is presented. The basis of these calculations is an exact knowledge of the differential efficiency of the detectors, i.e. the efficiency versus the position of irradiation on the detector surface. In order to calculate the differential efficiency of the Ge(Li) detectors two approaches were employed. The first is based on the probability of a direct photoelectric interaction of the γ-ray impinging on the crystal whereas the second is a Monte-Carlo simulation method. These calculations were carried out on four truly coaxial Ge(Li) detectors, which are currently employed in this laboratory. These counters have active volume of 5.3, 32, 36 and 45 cm 3, respectively. The finite solid-angle corrections were calculated for source-detector distances of 3.0, 5.0, 7.0, 10.0 and 14.0 cm and for an energy range from 60 keV to 2.0 MeV.
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