Summing coincidence correction for γ-ray measurements using the HPGe detector with a low background shielding system

A Monte Carlo method based on the GEANT4 toolkit has been developed to correct the full-energy peak (FEP) efficiencies of a high purity germanium (HPGe) detector equipped with a low background shielding system, and moreover evaluated using summing peaks in a numerical way. It is found that the FEP efficiencies of Co-60, Ba-133 and Eu-152 can be improved up to 18% by taking the calculated true summing coincidence factors (TSCFs) correction into account. Counts of summing coincidence gamma peaks in the spectrum of Eu-152 can be well reproduced using the corrected efficiency curve within an accuracy of 3%. (c) 2017 Elsevier B.V. All rights reserved.