Efficiency calibration of HPGe detector in a PGNAA system for the measurement of aqueous samples

摘要： In this work, a method was proposed for e?ciency calibration of HPGe detector employed in a prompt gamma-ray neutron activation analysis (PGNAA) system for large aqueous sample analysis. Experimental measurements of a reference surface gamma-ray source were combined with e?ciency transfer method to obtain e?ciency of a volumetric source. Then e?ciency curve over the energy range 0.5–8.5 MeV were determined with prompt gamma-rays of chlorine. To evaluate the performance of the calibration curve, an internal standard method was used to determine the aqueous sample containing manganese based on the calibration curve. The 7.058 MeV and 7.243 MeV manganese gamma-ray peaks were used to calculate the mass of manganese. The relative deviations of calculated values and actual value were 5.0% and 6.5%, respectively.