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Gamma ray spectrometry radionuclide identification method utilizing multiple detectors

A technology of gamma energy spectrum and identification method, which is applied in the field of gamma energy spectrum nuclide identification using multiple detectors, can solve the problems of poor spectral resolution, difficulty in spectral alignment, and impact on peak searching and identification. results, etc.

Active Publication Date: 2013-11-06
NUCTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the use of multiple detectors can improve the overall detection efficiency, it also leads to a new problem, that is, how to process multiple gamma spectra obtained by multiple detectors at the same time
A common method is to add these energy spectra after energy alignment. The problem with this method is that it is difficult to align these energy spectra
Due to the differences in the linearity and stability of each detector, the resolution of the energy spectrum after the addition is significantly deteriorated, thus affecting the results of peak finding and identification

Method used

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  • Gamma ray spectrometry radionuclide identification method utilizing multiple detectors
  • Gamma ray spectrometry radionuclide identification method utilizing multiple detectors
  • Gamma ray spectrometry radionuclide identification method utilizing multiple detectors

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Embodiment 1

[0028] figure 1 A flow chart of the gamma energy spectrum nuclide identification method of the present invention is shown. Such as figure 1 As shown, in step S01, the gamma energy spectrum of the substance to be detected is acquired by the gamma ray detection device, and is input into the gamma energy spectrum processing module for peak finding and nuclide identification. The gamma ray detection device described here can adopt various types of existing gamma ray detection devices (such as sodium iodide detectors), so the specific structure of the gamma ray detection device will not be repeated here. figure 2 The gamma energy spectrum of the nuclide Cs137 acquired with a sodium iodide detector is shown (where the abscissa is the number of traces and the ordinate is the count).

[0029] In the next step S02, peak search (that is, to find the peak in the gamma energy spectrum) will be carried out, and the channel number, energy, area and significance of the peak will be calcul...

Embodiment 2

[0050] Figure 5 is a flowchart of an embodiment of a gamma spectroscopic nuclide identification method utilizing multiple detectors according to the present invention. Figure 6 is a schematic flowchart of an embodiment of a gamma spectrum nuclide identification method using multiple detectors according to the present invention.

[0051] Such as Figure 5 shown (see Figure 6 ), according to an embodiment of the present invention, the gamma energy spectrum nuclide identification method using a plurality of detectors includes: Step S100: searching for peaks of energy spectra collected by a plurality of detectors from the detected substance at the same time, for example : When the significance of the peak found is higher than the first significance threshold, it is retained, otherwise it is removed; Step S200: use the peaks found in step S100 to form a merged peak, and each merged peak is composed of the energy difference in the predetermined range. peaks are combined, or ea...

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Abstract

The invention relates to a gamma ray spectrometry radionuclide identification method utilizing multiple detectors. The gamma ray spectrometry radionuclide identification method comprises the following steps: step 1) respectively seeking peaks of spectra acquired by multiple detectors from substances at the same time; step 2) utilizing the peaks sought in the step 1) to constitute merged peaks, wherein each merged peak is merged by a plurality of the peaks with energy difference in a preset range; and step 3) performing radionuclide identification by utilizing the merged peaks in the step 2). According to the method disclosed by the invention, high sensitivity and omnidirectional detection which are achieved by the multiple detectors can be utilized, and the problem that resolution is reduced due to addition of the multiple spectra can be also avoided. The method is not limited by the number of the detectors and can be used even part of the detectors is damaged.

Description

technical field [0001] The invention relates to a gamma energy spectrum nuclide identification method, in particular to a gamma energy spectrum nuclide identification method using multiple detectors. Background technique [0002] The method of nuclide identification by peak finding is widely used in radioactive substance monitoring system. This type of method first finds the position of the peak in the energy spectrum through peak searching and estimates the area of ​​the peak and other information, and then searches for nuclides that match the energy of these peak positions in the edited nuclide library, and establishes a linear variance group Or other methods to estimate the contribution of each nuclide to each peak area, so as to determine whether a certain nuclide is contained. The detection efficiency and resolution of the detector are the main factors affecting this type of method. In order to improve the detection efficiency, multiple detectors are often used to det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/36
Inventor 王强赵崑阮明
Owner NUCTECH CO LTD
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