Badawi M.S., El-Khatib A.M., Elzaher M.A., Thabet A.A., Sakr A.A.
USING AN ANALYTICAL EFFICIENCY TRANSFER PRINCIPLE TO CALCULATE THE FULL ENERGY PEAK EFFICIENCY FOR GAMMA DETECTORS ^{[№ 5 ' 2013]}
In this work the Full-Energy Peak Efficiency of NaI(Tl) — scintillation detectors (5.08x5.08 cm² and 7.62x7.62 cm²) values have been calculated for axial cylindrical sources of different dimensions larger than the detectors using an analytical approach of effective solid angle calculation. This approach is based on the ratio of the source-detector solid angle with taken the source self absorption effect in to account. The detector efficiency for various geometrical conditions is derived from the known efficiency for reference source-detector geometry. The present method shows a great possibilities to calibrate the detectors through the determination of the full-energy peak efficiency curve even in those case when no standard source is available and this consider as the final goal of this work.