Absolute Full Energy Peak Efficiency Calculation of (HPGe) Detector Based on SOLCOI Software

Full text follows: The knowledge of full energy peak efficiency (εp) is of great importance when performing k0NAA and absolute methods. Since most of calibration sources used for efficiency calculation emit many gamma lines in coincidence, therefore, they can't be used for efficiency determination at very close to the detector without applying correction for this phenomenon. Gamma spectroscopy based on p-type HPGe detector with Hyper Lab analytical software was used to investigate and validate the SOLCOI software for absolute full energy peak efficiency (FEPE) at reference (19 cm) and (10 cm) positions from the detector. In this study several multi-energetic point sources covering the energy from 60 to 2450 keV were used to perform the FEPE curve at reference position. The curve fitting of the experimental and the obtained values using SOLCOI software agree very well. The accuracy of the calculation was ascertained by determination of the efficiency using mono-energetic sources. The results obtained using both approaches are in good agreement and the uncertainties don't exceed 2 %.