Efficiency calibration of NaI (Tl) detector for disc source using point source experimental technique and Monte Carlo simulations

Azhar H. Malik; M. Rizwan; Rizwan Ahmed

doi:10.1117/12.2601166

1 July 2021 Efficiency calibration of NaI (Tl) detector for disc source using point source experimental technique and Monte Carlo simulations

Azhar H. Malik, M. Rizwan, Rizwan Ahmed

Author Affiliations +

Proceedings Volume 11877, Second iiScience International Conference 2021: Recent Advances in Photonics and Physical Sciences; 118770E (2021) https://doi.org/10.1117/12.2601166
Event: 2nd iiScience International Conference 2021: Recent Advances in Photonics and Physical Sciences, 2021, Faisalabad, Pakistan

Abstract

The detection efficiency of a gamma ray detector should be calibrated prior to the measurement of activity in samples. The aim of this research is to develop a simple experimental technique to calibrate the efficiency of detectors for geometrical sources by replicating their responses from virtually equivalent sources (VES) constructed from a collection of Standard Point Source (SPS) measurements. Experiments were performed to replicate the response of a disk source of 5.2 cm radius by equivalent disk sources (EDS) reconstructed from a collection of 19, 91 and 169 SPS measurements to optimize the number of measurements, response of detector for radially symmetric SPS locations was verified through Absolute Peak Efficiency (APE) calculations. APE was calculated experimentally for the actual disk source and EDS as well as using EGS5 simulations. The difference between experimentally measured and simulated APE for 5.2 cm EDS was observed to be about 7.8 %, 5.2 % and 5.4 % for 137Cs and about -1.3 %, 1.3 % and 2.7 % for 22Na for the EDS constructed from 19, 91- and 169 SPS measurements respectively

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Azhar H. Malik, M. Rizwan, and Rizwan Ahmed "Efficiency calibration of NaI (Tl) detector for disc source using point source experimental technique and Monte Carlo simulations", Proc. SPIE 11877, Second iiScience International Conference 2021: Recent Advances in Photonics and Physical Sciences, 118770E (1 July 2021); https://doi.org/10.1117/12.2601166

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