Theoretical Estimation Of Geometry Dependent Photon Detection Efficiency Of Nai (tl)crystal Of Different Size For Various Sources To Detector Distances

In this project the variation of the intrinsic efficiency of the Na I (Tl) detectorrnagainst the source detector distance has been calculated for different gamma rayrnenergy of 0.1, 0.2, 0.4, 0.6 1, 5, 7 and 10MeV and taking in to account variousrnsource to detector distance, ranging from 0 to 10 cm. The intrinsic efficiency dependsrnnot only on energy of photons but also on the geometry configuration of source andrndetector and source to detector distances. The intrinsic efficiency variation can bernanalyzed by the mean chord path length of the photon in the detector and the linearrnattenuation coefficient of photon in the detector

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