Güngür, D.Kızılyer, N. YavuzkanatYalçın, S.2022-01-242022-01-242018http://hdl.handle.net/20.500.12575/77218NaI(Tl) detectors have high detection efficiency. NaI(Tl) is good at detecting low-level radiation sources. In this study, the total gamma and peak efficiency results of NaI (Tl) detector for both point and disk sources were investigated. Total efficiency peak obtained by Geant4-based Gate Simulation program consisted with the literature and the data obtained using the hybrid Monte Carlo method. Full energy peak and total efficiency were also compared with the experimental result.enGammaDetector EfficiencyHybrid Monte Carlo SimulationGeant4Gate SimulationArticle05018