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An automatic peak-finding method for seawater radioactivity detection

A technology of radioactivity and radionuclides, which is applied in the field of automatic peak-finding of seawater radioactivity detection, can solve the problems of non-universal detection and achieve the effect of improving accuracy

Active Publication Date: 2019-06-25
OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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Problems solved by technology

[0004] Based on the above reasons, the existing peak-finding methods for detecting radioactive substances in seawater are not universal

Method used

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  • An automatic peak-finding method for seawater radioactivity detection
  • An automatic peak-finding method for seawater radioactivity detection
  • An automatic peak-finding method for seawater radioactivity detection

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0030] The invention provides an automatic peak-finding method for seawater radioactivity detection, such as figure 1 As shown, the specific process is as follows:

[0031] S101. Perform five-point smoothing on the data of all channels to make the data smoother.

[0032] The energy spectrum data curves of all channels are as follows figure 2 , assuming that the preset radionuclide is K, its preset existence interval is as follows image 3 As shown, in this embodiment, in order to filter some false peaks, from the third channel to the penultimate channel, assuming that the channel is i, the signal value is v(i), and the smoothed signal value is [-3 ×v(i-2)+12×v(i-1)+17×v(i)+12×v(i+1)+(-3)×v(i+2)] / 35. Smoothing is only to find the real peak position without affecting the cu...

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Abstract

The invention discloses an automatic peak searching method for seawater radioactivity detection. The method comprises: five-point smoothing of data of all channels is carried out; second-order derivatives for all data are calculated, all second-order derivatives in a preset radionuclide existence zone range are traversed to be negative data points as preset peak positions; left and right boundaries of the preset peak positions are calculated; Gaussian function fitting of original data in the left and right boundary ranges is carried out, the full width at half maximum of each obtained fittingfunction is compared with a preset full width at half maximum of the radionuclide, data exceeding the range of plus or minus 5% are directly eliminated, and the preset peak position with the fitting function having the full width at half maximum closest to the preset full width at half maximum of the radionuclide is determined as a to-be-searched radionuclide peak. The disclosed automatic peak searching method is free from the accumulation time restriction as well as the restriction of the interference of the marine environment; overlapped peaks can be identified; and some obvious false peakscan be filtered automatically. Therefore, the peak searching accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of seawater detection, in particular to an automatic peak-finding method for seawater radioactivity detection. Background technique [0002] During the comprehensive measurement of marine radioactive substances, if there are corresponding radioactive substances, corresponding peaks will appear in the corresponding energy range. Due to the irregular drift of the peak of the detected radionuclide signal, an automatic peak-finding method for seawater radioactivity detection is necessary for the efficiency of marine radioactivity measurement and is the core of the current development of domestic marine radioactivity measurement. The existing seawater radioactive environmental monitoring methods are usually based on the assumption that the detection signals corresponding to the radioactive substances to be measured in seawater are stable or time-invariant, and are not suitable for complex marine environments. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/167
CPCG01T1/167
Inventor 程岩张颖袁达吴丙伟张云燕曹璐王茜刘东彦张颖颖侯广利
Owner OCEANOGRAPHIC INSTR RES INST SHANDONG ACAD OF SCI
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