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A method of spectrometry analysis based on approximation coefficients and deep belief networks was developed.Detection rate and accurate radionuclide identification distance were used to evaluate the performance of the proposed method in identifying radionuclides.Experimental results show that identification performance was not affected by detection time,number of radionuclides,or detection distance when the minimum detectable activity of a single radionuclide was satisfied.Moreover,the proposed method could accurately predict isotopic compositions from the spectra of moving radionuclides.Thus,the designed method can be used for radiation monitoring instruments that identify radionuclides.