الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Gamma rays have a wide spread range of applications in different fields of science. As an example: the study of nuclear structure, the identification of radioisotopes and their intensities and activities, estimating the absorbed doses and the determination of interaction cross sections where gamma rays is either incident or out going from the reaction. Therefore the gamma ray spectroscopy is very important factor and has to be determined with high accuracy. This work is concerned with the high accurate measurement and identification of gamma spectrum using a cylindrical semiconductor (germanium) and scintillation (sodium iodide) detectors. This has been achieved by studying the history of the interactions of gamma rays inside the detector and the Resulting energy deposition within was givenThe main part of this thesis is focused ’on the detector efficiencies, which is important factor
necessary to determine in advance. These efficiencies are the total efficiency CT, where the whole resulting spectrum from a detector is to be considered or otherwise the full energy peak (or simply the photo peak) efficiency cp, where considerations are limited to the peak of the resulting spectrum being formed when monoenergetic gamma rays are incident on the considered detector and determine its ratio.