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Updated: Mar 15, 2026

Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
Published on: January 30, 2020
Geometrical parameters and scattered radiation effects on the extrinsic sensitivity and counting efficiency of a
Mohamed A Ghoneim1, M H Khedr2, Wael M Elshemey3
1Physics Department, Faculty of Science, Assiut University, Egypt.
Abstract:
A point source is used to investigate the effect of water phantom thickness and source-to-detector distance (SDD) on the sensitivity and counting efficiency of a rectangular detector gamma camera. The increase in water thickness resulted in an increase in scatter fraction, a decrease in sensitivity, and counting efficiency. The increase in SDD resulted in a decrease in sensitivity and an increase in counting efficiency. An SDD of 0.79±0.02m is found to provide a good compromise for acceptable sensitivity and reasonable counting efficiency.
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