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Efficiency calibration of HPGe detector in a PGNAA system for the measurement of aqueous samples
Can Cheng1, Wenbao Jia2, Daqian Hei2
1College of Astronautics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China; Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education Institutions, Suzhou 215000, China.
Abstract:
In this work, a method was proposed for efficiency 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 efficiency transfer method to obtain efficiency of a volumetric source. Then efficiency 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.
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