New numerical simulation method to calibrate the regular hexagonal NaI(Tl) detector with radioactive point sources situated non-axial

Scintillation crystals are usually used fordetection of energeticphotons at room temperature in high energy and nuclear physics research, non-destructive analysis of materials testing, safeguards, nuclear treaty verification, geological exploration, and medical imaging. Therefore, new designs and construction of radioactive beam facilities are coming on-line with these science brunches. A good number of researchers are investigating the efficiency of the γ-raydetectors to improve the models and techniques used in order to deal with the most pressing problems in physics research today. In the present work, a new integrative and uncomplicated numerical simulation method (NSM) is used to compute the full-energy (photo) peak efficiency of a regular hexagonal prism NaI(Tl)gamma-ray detector using radioactive pointsources situated non-axial within its front surface boundaries. This simulation method is based on the efficiency transfer method. Most of the mathematical formulas in this work are derived analytically and solved numerically. The main core of the NSM is the calculation of the effective solid angle for radioactive pointsources, which are situated non-axially at different distances from the front surface of thedetector. The attenuation of the γ-rays through thedetector ’s material and any other materials in-between thesource and thedetector is taken into account. A remarkable agreement between the experimental and calculated by present formalism results has been observ...

Source: Review of Scientific Instruments - November 9, 2016 Category: Physics Authors: Ayman Hamzawy, Dimitar N. Grozdanov, Mohamed S. Badawi, Fuad A. Aliyev, Abouzeid A. Thabet, Mahmoud I. Abbas, Ivan N. Ruskov, Ahmed M. El-Khatib, Yuri N. Kopatch and Mona M. Gouda Source Type: research