Accurate calculation of total efficiency of Ge well-type detectors suitable for efficiency calibration using common standard sources

A new method for the calculation of coincidence summing out corrections appropriate for γ-spectrometry measurements in the Ge well-type detector geometry is proposed. The method is based on a simple formula for the total efficiency of the detector, using an exact analytical relation for the mean detector thickness, combined with approximate formulas describing the interactions in the source and in the materials interposed between the source and the detector. The method can be easily applied for establishing the corrected, nuclide independent, efficiency calibration curves of Ge well-type detectors using experimental calibration data obtained with the common mixed γ-ray standard source containing 60Co and 88Y.