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http://dx.doi.org/10.5516/NET.04.2013.077

STUDY ON THE EFFECT OF THE SELF-ATTENUATION COEFFICIENT ON γ-RAY DETECTOR EFFICIENCY CALCULATED AT LOW AND HIGH ENERGY REGIONS  

El-Khatib, Ahmed M. (Physics Department, Faculty of Science, Alexandria University)
Thabet, Abouzeid A. (Department of Medical Equipment Technology, Pharos University in Alexandria)
Elzaher, Mohamed A. (Department of Basic and Applied Sciences, Faculty of Engineering, Arab Academy for Science, Technology and Maritime Transport)
Badawi, Mohamed S. (Physics Department, Faculty of Science, Alexandria University)
Salem, Bohaysa A. (Basic Science Department, Faculty of Physical Therapy, Pharos University in Alexandria)
Publication Information
Nuclear Engineering and Technology / v.46, no.2, 2014 , pp. 217-224 More about this Journal
Abstract
The present work used the efficiency transfer method used to calculate the full energy peak efficiency (FEPE) curves of the (2"*2" & 3"*3") NaI (Tl) detectors based on the effective solid angle subtended between the source and the detector. The study covered the effect of the self attenuation coefficient of the source matrix (with a radius greater than the detector's radius) on the detector efficiency. $^{152}$ An Eu aqueous radioactive source covering the energy range from 121.78 keV up to 1408.01 keV was used. In this study an empirical formula was deduced to calculate the difference between the measured and the calculated efficiencies [without self attenuation] at low and high energy regions. A proper balance between the measured and calculated efficiencies [with self attenuation] was achieved with discrepancies less than 3%, while reaching 39% for calculating values [without self attenuation] due to working with large sources, or for low photon energies.
Keywords
Self Attenuation Coefficient; NaI (Tl) Detectors; Full Energy Peak Efficiency (FEPE); New Empirical Formula and Efficiency Transfer Method;
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