Experimental Verification of Gamma-Efficiency Calculations for Scintillation Detectors in Angle 4 Software
EXPERIMENTAL VERIFICATION OF GAMMA-EFFICIENCY CALCULATIONS FOR SCINTILLATION DETECTORS IN ANGLE 4 SOFTWARE Abouzeid A. THABET a, Aleksandar D. DLABAC b, Slobodan I. JOVANOVIC b,c,*, Mohamed S. BADAWI d, Nikola N. MIHALJEVIC b,e , Ahmed M. EL-KHATIB d, Mona M. GOUDA d, and Mahmoud I. ABBAS d aDepartment of Medical Equipment Technology, Faculty of Allied Medical Sciences, Pharos University in Alexandria, Alexandria, Egypt bCentre for Nuclear Competence and Knowledge Management, University of Montenegro, Podgorica, Montenegro cDepartment of Physics, Faculty of Mathematics and Natural Sciences, University of Montenegro, Podgorica, Montenegro dDepartment of Physics, Faculty of Science, Alexandria University, Alexandria, Egypt eDepartment of Mathematics, Maritime Faculty, University of Montenegro, Kotor, Montenegro Abstract ANGLE software for semiconductor detector efficiency calculations – long existing and widely accepted tool in quantitative gamma-spectrometry – has been recently extended to scintillation NaI detectors. The extension features in the latest edition (ANGLE 4) and is briefly outlined. “Discretization” of reference efficiency curve (REC), meaning possibility of using ANGLE 4 for a particular gamma-energies without constructing the complete REC, is particularly emphasized. This yields both enhanced practicality and higher accuracy, while reducing the potential for systematic errors. The present work is primarily focussed on experimental verification of ANGLE 4 for NaI detectors. Two detectors (2 ×2 and 3 ×3 inches) were employed in the experiment. Commercially calibrated gamma-sources (in forms of quasi-point and cylinder) and home made solutions (diluted from calibrated ones) were counted on various distances from the detector(s), ranging 0 – 20 cm. Energy range observed was 59 – 1408 keV. Versatility of counting conditions, in terms of detectors and sources used, gamma-energies observed, source-detector separations, etc., was aimed at creating as large experimental evidence as possible for verification purposes.
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