Scintillation detector has lower energy resolution for Gamma-ray as compared to semiconductor detector, better spectra analysis method is essential to traditional method. A model for describing the response function of scintillation detector over the range of incident Gamma-ray energies between 0.5 and 1.5 MeV has been established and applied to fitting radiation sources spectra. Each function form for describing the feature of Gamma-ray spectra are based on the analysis of fundamental interaction mechanism. These functions are combined to form a DRF model to fit experiment spectra by weighted least squares fitting method, parameters in this model are obtained simultaneously. Gaussian standard deviation can be calculated out by an individual procedure. Validity of the DRF model is demonstrated by fitting Co-60 and Cs-137 spectra measured by CsI(Tl) detector and comparing them to the normalized equivalent measured spectrum.
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