Nuclide identification method and device

The invention provides a nuclide identification method and device. The nuclide identification method comprises the following steps: acquiring gamma energy spectrum data of a target radioactive source; judging whether the characteristic peaks of the gamma energy spectrum data contain other characteristic peaks except the specified characteristic peak or not; if yes, first peak areas corresponding to other characteristic peaks are determined according to the gamma energy spectrum data, and a second peak area of the specified characteristic peak is determined; determining the total area of specified characteristic peaks contributed by all nuclides of the target radioactive source according to the first peak area and the peak branching ratio of each first nuclide; according to the second peak area and the total area, determining whether the target radioactive source contains a second nuclide only having the specified energy peak value; if yes, determining a second nuclide in the target radioactive source through