Abstract
In this work we calibrated the NaI(Tl) scintillation detectors (5.08 × 5.08 cm2 and 7.62 × 7.62 cm2) and the Full Energy Peak Efficiency (FEPE) for these detectors have been calculated for point sources placed at different positions on the detector axis using the analytical approach of the effective solid angle ratio. This approach is based on the direct mathematical method reported by Selim and Abbas [1,2] and has been used successfully before to calibrate the cylindrical, parallelepiped, and 4π NaI(Tl) detectors by using point, plane and volumetric sources. In addition, the present method is free of some major inconveniences of the conventional methods.
Highlights
Determination of detector efficiency is very important in various scientific and industrial fields
In this work we calibrated the NaI(Tl) scintillation detectors (5.08 × 5.08 cm2 and 7.62 × 7.62 cm2) and the Full Energy Peak Efficiency (FEPE) for these detectors have been calculated for point sources placed at different positions on the detector axis using the analytical approach of the effective solid angle ratio
The Full Energy Peak Efficiency values will determined for NaI(Tl) Scintillation Detector Model number 802made by Canberra USA in this work two NaI (Tl) scintillation detectors (5.08 × 5.08 cm2) detector (D1) with resolution 8.5% which specified at the 661 keV, and (7.62 × 7.62 cm2) detector (D2) with resolution 7.5% which specified at the 661 keV were used
Summary
Determination of detector efficiency is very important in various scientific and industrial fields. Because the experimental work is tedious and even difficult for extended sources, many researches have been focused on the development of computational techniques to determine these efficiencies. There are three famous methods used in this field, the semi-empirical, the Monte Carlo, and the direct mathematical methods. One of these computational techniques is the efficiency transfer method in which the computation of the detector efficiency for various geometrical conditions is derived from the known efficiency for a reference source-detector geometry. The main advantage of the Efficiency Transfer approach with a point calibration source located at a sufficient distance from the detector is that one may neglect coincidence summing effects and obtain a coincidence free efficiency curve [3]. The efficiency transfer method is useful due to its insensitivity to the inaccuracy of the input data, e.g. to the uncertainty of the detector characterization [4,5]
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