الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
This dissertation studies and discusses the establish a mathematical model to compute the gamma-gamma coincidence-summing-factors based on calculations of the detector efficiencies beside to studying all the factors effecting on the computation of the detector full-energy peak efficiency such as, the source self-absorption coefficient in type of point source at various source-to-detector distances. A coincidence-correction-factors have been computed utilizing three various radionuclides such as, 60Co, 133Ba and 152Eu. The experimental values of the full-energy-peak-efficiency have been corrected for NaI (Tl) scintillation detector. A numerical-simulation-method (NSM), ETNA program and EFFTRAN software were utilized to compute a coincidence-summing-correction-factors as very well. The dissertation includes six chapters, (150) references, two appendices, beside English and Arabic summaries.This chapter provides a general introduction about the gamma-rays spectrometry, applications, beside the studying of the various factors impacting on the detection efficiency, specifically the coincidence summing effect. Literature review on the precedent works and at the end of this chapter, we review the aim of the work.