• Efficiency calibration of $\gamma$-ray detector for extended sources

• # Fulltext

https://www.ias.ac.in/article/fulltext/pram/092/04/0067

• # Keywords

HPGe $\gamma$ -ray spectrometry; efficiency; source–detector geometry; solid angle; standard point source; efficiency loss in extended samples

• # Abstract

Precise identification and quantification of radioisotope in a sample largely depend on the accuracy of the full-energy peak efficiency of the detector. It is generally observed that the efficiency for a given energy of point-like sources is not the same as the extended source. However, number of correction factors such as detector geometry, photon attenuation, coincidence-summing, etc. may reduce such a difference in efficiency regardless of sources, or they should be considered in the measurement of extended samples. In connection to this, the variation of absolute photopeak efficiency of a high-purity germanium (HPGe) detector with the distances from the surface of the detector as well as with the γ-ray energies were investigated using $\gamma$-ray standard point sources. We present a method to determine the loss of efficiencies in radioactivity measurement of the thin extended radioactive disc samples in comparison to point source.

• # Author Affiliations

1. Institute of Nuclear Science and Technology, Atomic Energy Research Establishment, Savar, Dhaka, Bangladesh
2. Department of Physics, Chittagong University of Engineering and Technology, Chittagong 4349, Bangladesh
3. Faculty of Engineering, King Abdul Aziz University, Jeddah, Kingdom of Saudi Arabia
4. Center for Biomedical Physics, School of Healthcare and Medical Sciences, Sunway University, 47500 Bandar Sunway, Selangor, Malaysia

• # Pramana – Journal of Physics

Volume 96, 2022
All articles
Continuous Article Publishing mode

• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019