Method for identifying gamma energy spectrum nuclides

A technology of gamma energy spectrum and identification method, which is applied in the identification field of identifying radioactive elements contained in the tested substance through gamma energy spectrum, and achieves the effects of reducing loss, high detection speed and sensitivity, and ensuring accuracy.

Active Publication Date: 2011-06-01
NUCTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • Method for identifying gamma energy spectrum nuclides
  • Method for identifying gamma energy spectrum nuclides
  • Method for identifying gamma energy spectrum nuclides

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Embodiment Construction

[0030] The gamma spectroscopy nuclide identification method of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] figure 1 The flow chart of the gamma spectroscopy nuclide identification method of the present invention is shown. Such as figure 1 As shown, in step S01, the gamma energy spectrum of the detected substance is obtained by the gamma ray detection device, and is input to the gamma energy spectrum processing module for peak searching and nuclide identification. The gamma-ray detection device described here can use various types of existing gamma-ray detection devices (for example, sodium iodide detectors), so the specific structure of the gamma-ray detection device will not be repeated in this article. figure 2 Shows the gamma spectrum of the nuclide Cs137 acquired with a sodium iodide detector (where the abscissa is the number of tracks and the ordinate is the count).

[0032] In the next step S02, peak searching...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/16
Inventor 王强赵崑阮明彭华
Owner NUCTECH CO LTD
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