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Geant4 Tracks of NaI Cubic Detector Peak Efficiency, Including Coincidence Summing Correction for Rectangular Sources

Mohamed Elsafi, Jamila S. Alzahrani, Mahmoud I. Abbas, Mona M. Gouda, Abouzeid A. Thabet, Mohamed S. Badawi, Ahmed M. El-Khatib

Nuclear Science and Engineering | Volume 195 | Number 9 | September 2021 | Pages 1008-1016

Technical Note | doi.org/10.1080/00295639.2021.1895406

Received:October 30, 2020

Accepted:February 19, 2021

Published:August 23, 2021

Articles are hosted by Taylor and Francis Online.

The optimization of measurement of environmental samples is achieved by putting the sample closer to the detector to increase the full-energy peak efficiency, which leads to decrease of the detection limit. The present work inspects the utilization of Geant4 simulation for a NaI cubic scintillation detector with a cavity using two tracks. The radionuclide option includes coincidence summing, and the monoenergetic option is summing free coincidence. The ratio between the monoenergetic to redionuclide options gives the coincidence summing correction factors. In the experiments a gamma-ray aqueous source containing the radionuclide ¹⁵²Eu covering the range from 121 to 1408 keV was used. Comparing the monoenergetic option for calculating the full-energy peak efficiency and the corrected experimental efficiency, the values are in agreement.