Corrections of HPGe detector efficiency curve due to true coincidence summing by program EFFTRAN and by Monte Carlo simulations

J Knezevic; D Mrdja; J Hansman; K Bikit; S Forkapic; I Bikit; D Velimirovic; P Kuzmanovic

doi:10.1016/j.apradiso.2022.110421

Corrections of HPGe detector efficiency curve due to true coincidence summing by program EFFTRAN and by Monte Carlo simulations

Appl Radiat Isot. 2022 Nov:189:110421. doi: 10.1016/j.apradiso.2022.110421. Epub 2022 Aug 24.

Authors

J Knezevic¹, D Mrdja², J Hansman², K Bikit², S Forkapic², I Bikit², D Velimirovic², P Kuzmanovic³

Affiliations

¹ University of Novi Sad, Faculty of Sciences, Department of Physics, Trg Dositeja Obradovica 4, Novi Sad, Serbia. Electronic address: jovana.knezevic@df.uns.ac.rs.
² University of Novi Sad, Faculty of Sciences, Department of Physics, Trg Dositeja Obradovica 4, Novi Sad, Serbia.
³ University of Novi Sad, Faculty of Sciences, Department of Physics, Trg Dositeja Obradovica 4, Novi Sad, Serbia; Academy of Applied Studies Šabac, Dobropoljska 5, Sabac, Serbia.

PMID: 36037728
DOI: 10.1016/j.apradiso.2022.110421

Abstract

Standard reference sources, used for efficiency curve calibration of detector, often contain radionuclides with complex decay schemes (such as ⁶⁰Co, ⁸⁸Y, ¹⁵²Eu …), introducing a potential problem in gamma-ray spectrometry, due to the appearance of coincidence summing of detected photons, in particular at a low source-detector distance. In this paper, a set of Monte Carlo simulations of an identical experimental setup were performed in order to obtain the efficiency curve of coaxial p-type HPGe detector for energy region (0-2) MeV, with the effect of true coincidence summing and without it. Obtained efficiency curves are compared with the experimental curve after applied EFFTRAN corrections. Fairly well agreement (between simulated and experimental curves with EFFTRAN corrections (with a relative deviation of 10%) proved the reliability of EFFTRAN corrections, as well as the possibility of Monte Carlo simulations for efficiency curve determination.

Keywords: EFFTRAN; Efficiency curve; HPGe detector; Monte Carlo simulation.