Method for identifying gamma energy spectrum nuclides

Abstract

The invention provides a method for identifying gamma energy spectrum nuclides, which comprises the following steps of: (a) acquiring a gamma energy spectrum; (b) seeking for a peak in the energy spectrum and calculating the area of the peak; (c) obtaining candidate nuclides, which are possibly present, by matching the found peak with a spectral line of nuclides in a nuclide library; (d) calculating the occurrence possibility of each candidate nuclide by using a Bayesian network model; and (e) eliminating the situation in which mutual interference exists between the candidate nuclides due to the matching of the same peak, and updating the occurrence possibility of each candidate nuclide to obtain a final confidence coefficient.

Description

Technical field [0001] The present invention relates to a method for identifying radioactive materials, and in particular to a method for identifying radioactive elements contained in test materials through gamma energy spectrum. Background technique [0002] Radioactive substances (also called nuclides) have their own unique intrinsic energy spectrum, that is, the gamma rays released by each nuclide have several energies, and the intensity ratio of the gamma rays of various energies is constant. Based on this property of radioactive materials, the nuclides contained in the test materials can be identified by analyzing the gamma energy spectrum of the test materials. [0003] Gamma photons are incident on the crystal in the detector to make the crystal emit light. The optical signal generated by the crystal is converted into a pulse signal by a photomultiplier tube, and the intensity of the pulse is proportional to the energy of the incident photon. In a period of time, all the pu...

AI Technical Summary

Problems solved by technology

At this time, although the simulation method can be used to simulate the energy spectrum under various conditions, the huge amount of calculation is also unbearable.

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