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Abstract Gamma rays have a wide spread range of applications in ~ . different fields of science. As an example: thelstudy of nuclear structure, the identification of radio-isotopes and their intensities, estimating the absorbed doses and the determination of interaction cross-sections where gamma rays are either incident or out going from the reaction. Therefore, 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 a gamma spectrum using a NaI scintillation detector. This has been achieved by one of ways. It is devoted to the experimental technique, where, methods of detection and recording systems are discussed. Interactions of the gamma rays in the detector and the resulting deposited energy within was given. The main part of this thesis is concerned with what are termed the detector efficiencies- important factors necessary to be determined in advance. These efficiencies are so-called as: the intrinsic Cl and total efficiency cr, where, the whole resulting spectrum from a detector is to be considered- or otherwise the intrinsic peak efficiency GIp and the full energy peak( or simply the photopeak ) efficiency C p , where, considerations are limited to the peak of a resulting spectrum being formed when monoenergetic gamma rays are incident on the considered detector. Different methods are usually to be followed in order to determine the detector’s efficiencies. |