الفهرس 
.IntoductionOnly 14 pages are availabe for public view
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Abstract
Study the detector efficiency in different geometries is the basis to calculate the exact activity of radionuclides. Many applications are based on the studying of radioactive materials, like, studying of the nuclear structure, identification of radioisotopes and their activities, estimating the absorbed dose, and determination of the reaction cross sections. The new developments in gamma-ray spectrometry have expanded and have been applied in diverse fields such as astrophysics and medical therapy where highly accurate measurements of gamma-rays are needed. This has been achieved by way of tracing the interaction of gamma-rays in the semiconductor and scintillation detectors and the energy deposited within. This thesis is a study case for Dependence of the detection efficiency on the linear and angular position of the radioactive source with respect to the detector. The thesis contains five chapters, (93) references, two appendices, plus Arabic summary.