Extraction of full energy peak of 137Cs from in situ NaI (Tl) gamma-ray spectrum

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A Levenberg–Marquardt Gaussian fitting algorithm has been used for analyzing the overlap of three peaks(the 583-ke V peak of~(208)Tl, the 609-ke V peak of214 Bi, and the 662-ke V peak of~(137)Cs) using an in situ Na I(Tl) scintillation spectrometer. The a
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