CN111046833B - Secondary peak searching method for seawater radionuclide detection - Google Patents
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Abstract
The invention belongs to the technical field of seawater detection, and relates to a secondary peak searching method for seawater radionuclide detection, which comprises the following steps: (1) Searching a peak of the radionuclide and an overlapping peak, and removing the overlapping peak; (2) Traversing peak regions of the radioactive nuclide, and searching the maximum signal value again; (3) Determining a signal value of the full width at half maximum of the new peak according to the signal value of the new peak, and then judging a channel where the signal of the full width at half maximum of the new peak is located; (4) calculating the full width at half maximum of a new peak and a peak boundary; (5) And fitting a Gaussian function according to the signal value of the new peak, the full width at half maximum and the fitted peak, namely the peak found for the radionuclide twice. The secondary peak searching method for detecting the seawater radionuclide rapidly finds and removes the interference overlapping peak of the radionuclide peak on the basis of finding the seawater radionuclide peak, and reduces the real peak of the radionuclide by fitting according to the removed result. The method of the invention enables the peak of the found radionuclide to be closer to the true value through two peak searching, and further improves the detection accuracy.
Description
Technical Field
The invention belongs to the technical field of seawater detection, and relates to a peak searching method for seawater radionuclide detection.
Background
In the comprehensive measurement process of the ocean radioactive substances, if corresponding radioactive substances exist, corresponding peaks appear in corresponding energy intervals. Because the peaks of the radioactive nuclide signals are detected to be irregularly shifted and overlapped, the peaks of the radioactive nuclides in the seawater possibly have overlapped peaks, and the detection result of the radioactive nuclides in the seawater is influenced. The existing method for monitoring the radioactive environment of seawater is generally based on the premise that the detection signal corresponding to the radioactive substance to be detected in seawater is stable or time-invariant, and is not suitable for complex marine environment.
In the actual operation process, the measurement of marine substances is interfered by the change of marine environment, and the phenomenon is that the amplitude of a detected voltage signal changes irregularly. In the prior art, a plurality of invention patents applied earlier by the applicant of the present invention disclose peak searching methods, overlapping peak judging methods and the like for detecting seawater radionuclide K40, which can quickly find the peak of the radionuclide, judge the existence of interfering overlapping peaks, and improve the accuracy of radioactivity detection to a certain extent. However, the actual ocean field detection environment is complex and variable, and the interference factors are many. In general, during the detection process of the radionuclide K40, a plurality of peaks occur, including false peaks, superimposed peaks and error peaks caused by interference data. How to eliminate the detection error caused by the interference factor and further improve the accuracy of radionuclide detection is a problem to be solved in the field.
Disclosure of Invention
In order to solve the technical problems, the invention provides a secondary peak searching method for detecting radionuclides in seawater, which is used for quickly finding and removing interference overlapping peaks of the radionuclides on the basis of finding the peak of the radionuclides in the seawater, and fitting and reducing real peaks of the radionuclides according to the removed result so as to achieve the purpose of improving the peak searching efficiency and accuracy.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a secondary peak searching method for detecting radionuclides in seawater comprises the following steps:
(1) Searching a peak of the radionuclide and an overlapping peak, and removing the overlapping peak;
(2) Traversing peak regions of the radioactive nuclide, and searching the maximum signal value again;
(3) Determining a signal value of the new peak full width at half maximum according to the signal value of the new peak, and then judging a channel where the signal of the new peak full width at half maximum is located;
(4) Calculating the half-height width and peak boundary of a new peak;
(5) Fitting a Gaussian function according to the signal value and the full width at half maximum of the new peak, and finding the peak for the radionuclide twice by the fitted peak.
In the above scheme, in the step (1), the method for removing the overlapping peaks includes:
(a) Judging a channel where the half-height-width signal value of the overlapping peak is located;
(b) Calculating a Gaussian function of the overlapped peaks;
(c) And traversing all channels of the peak interval of the radioactive nuclide, calculating the signal value of the Gaussian function corresponding to each channel, and subtracting the signal value of the corresponding Gaussian function from the original signal value of the channel.
Further, the step (a) of determining the channel where the half-height-width signal value of the overlapping peak is located includes:
if the overlapping peak is on the right side of the radionuclide peak, looking up from the peak position of the overlapping peak to the right side, the first signal value is less than or equal to Y max And at the point of/2, the channel corresponding to the point is the channel where the full width at half maximum signal value is located.
If the overlapping peak is on the left side of the radionuclide peak, the first signal value is less than or equal to Y by searching the peak position of the overlapping peak to the left side max And/2, the channel corresponding to the point is the channel where the full width at half maximum signal value is located.
Wherein: y is max And/2 is the half-high signal value of the overlapping peak.
Further, the gaussian function of the overlapping peaks in step (b) is:
wherein Y is max Peak signal values for overlapping peaks, X max Is the peak channel of the overlapped peak, namely the peak channel of the Gaussian fitting function of the overlapped peak, S/2 is the square value of the half width of the overlapped peak fitting, X i As channel values of the fitted curve, Y i And fitting the signal value corresponding to the curve channel.
In the above scheme, the peak area of the radionuclide in the step (2) is the left and right boundary range of the peak obtained by the first peak searching; the maximum value of the signal in the range is a new peak, and the channel in which the signal value is located is the channel of the new peak.
In the above scheme, the step (3) determines the signal value of the new peak at full width at half maximum according to the signal value of the new peak, and then judges the channel where the signal of the new peak at full width at half maximum is located;
if the overlapping peak is to the right of the radionuclide peak, the first signal value is ≦ Y 'looking to the left from the new peak position' max And 2, the channel corresponding to the point is the channel where the full width at half maximum signal value is located.
If the overlapping peak is to the left of the radionuclide peak, the first signal value is ≦ Y 'looking to the right from the re-peak position' max At the point of/2, the channel corresponding to the point is the channel where the full width at half maximum signal value is located;
wherein, Y' max And/2 is the half-height signal value of the new peak.
In the foregoing scheme, in the step (4), calculating the new peak full width at half maximum and the peak boundary includes:
if the overlapping peak is to the right of the radionuclide peak, the full width at half maximum of the new peak = the channel where the new peak is located-the channel where the full width at half maximum signal value is located; the channel where the left boundary of the peak is the channel where the left boundary is obtained by first peak finding, and the channel where the right boundary is =2 × the channel where the new peak is-the channel where the left boundary is;
if the overlapping peak is to the left of the radionuclide peak, the full width at half maximum of the new peak = the channel where the full width at half maximum signal value is located-the channel where the new peak is located; the channel where the right boundary of the peak is located is the channel where the right boundary obtained by the first peak finding is located, and the channel where the left boundary is located =2 × the channel where the new peak is located — the channel where the right boundary is located.
In the above scheme, in the step (5), a gaussian function is fitted according to the signal value and the full width at half maximum of the new peak, and the fitted peak is a peak found for the radionuclide twice. The gaussian function is as follows:
wherein, Y' max Is the peak signal value, X 'of the new peak' max Is the peak channel of the new peak, S '/2 is the square of the full width at half maximum of the new peak fit, X' i Channel value, Y 'to fitted curve' i And fitting the signal value corresponding to the curve channel.
The secondary peak searching method for detecting the seawater radionuclide rapidly finds and removes the interference overlapping peak of the radionuclide peak on the basis of finding the seawater radionuclide peak, and reduces the real peak of the radionuclide by fitting according to the removed result. The method of the invention enables the found peak of the radionuclide to be closer to the true value through two peak searching, thereby further improving the detection accuracy.
Drawings
Fig. 1 is a schematic flow chart of a secondary peak-finding method for detecting a marine radionuclide K40 according to an embodiment of the present invention;
FIG. 2 is a graph of spectral data for all channels disclosed in an embodiment of the present invention;
FIG. 3 is a graph of the amplified K40 peak and the overlapping peak disclosed in an embodiment of the present invention, wherein: a is the original K40 peak, c is the overlapping peak, and the vertical line is the peak channel of the overlapping peak;
FIG. 4 is an enlarged K40 peak and an overlapping peak according to an embodiment of the present invention, wherein the vertical line indicates the half width channel of the overlapping peak;
FIG. 5 is a Gaussian fitted curve of overlapping peaks as disclosed in an embodiment of the present invention;
fig. 6 shows peaks of an interference-free signal after removing overlapping peaks according to an embodiment of the present invention, wherein: a is the original K40 peak, b is the peak of the radionuclide K40 without interference signals after the overlapping peak is removed, and c is the overlapping peak;
FIG. 7 shows the magnified K40 peak and the new peak, the new peak being shown in the vertical line;
FIG. 8 shows the magnified K40 peak and the new peak, where the vertical line indicates the full width at half maximum of the new peak;
fig. 9 is the final peak obtained after the second peak finding, which is finally calculated by using the data curve, wherein: a is the original K40 peak, b is the new peak found twice, e curve is the Gaussian fitting curve of the new peak, d curve is the Gaussian fitting curve of the overlapped peak.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
The invention provides a secondary peak searching method for detecting a seawater radionuclide K40, which has the flow shown in figure 1 and comprises the following specific steps:
s101, removing overlapped peaks by using peak searching method and overlapped peak judging method disclosed by the applicant of the invention before the application date of the invention
The energy spectrum curve of the found peak of the radionuclide K40 is shown in fig. 2, and the peak, the overlapping peak, and the channel where the overlapping peak of the radionuclide K40 is located can be found from the enlarged fig. 3.
1. Judging a signal value of half-height of the overlapping peak according to the signal value of the overlapping peak;
in this embodiment, the overlapping peak of the radionuclide K40 is found to be 854 channels, and the corresponding signal value of this channel is 333. The signal value at half height is 333/2=166.5.
2. Judging a channel where the half-height-width signal value of the overlapping peak is located;
if the overlapping peak is on the right side of the radionuclide peak, looking up from the peak position of the overlapping peak to the right side, the first signal value is less than or equal to Y max And at the point of/2, the channel corresponding to the point is the channel where the full width at half maximum signal value is located.
If the overlapping peak is on the left side of the radionuclide peak, the first signal value is less than or equal to Y by searching the peak position of the overlapping peak to the left side max And/2, the channel corresponding to the point is the channel where the full width at half maximum signal value is located.
Wherein: y is max And/2 is the half-high signal value of the overlapping peak.
In the present embodiment, the peak position of the overlapping peak is located on the right side of the peak of the radionuclide K40, so looking up from the peak position to the right side, the channel corresponding to the first signal value less than or equal to 166.5 is the channel where the half-height-width signal value of the overlapping peak is located, as shown by the position of the vertical line in fig. 4.
The first signal value smaller than 166.5 is found to be 137, and the channel corresponding to the signal value is 867.
3. Calculating a Gaussian function of the overlapping peak according to the channel, the signal value and the full width at half maximum of the overlapping peak;
wherein: s is 2 × half-width square =2 × (867-854) × (867-854) =338; x i Refers to the ith channel; y is i Is the signal value of the ith channel; x max The channel in which the peak of the overlapping peaks is located, Y max Signal values for overlapping peaks in the raw data. In the present embodiment, X max =854; y is max ＝333；
4. Traversing all channels of the peak interval, calculating the signal value of the gaussian function of each channel, as shown in fig. 5, where the curve is a gaussian fit curve of the overlapped peaks, and the fitted signal values are as follows:
164.517600；153.839200；164.017200；181.421200；190.409200；185.665200；186.828000；192.915600；221.407600；242.262400；255.755600；265.391200；292.796800；323.278800；343.304000；366.074800；399.863600；464.009600；519.021200；561.567600；572.320800；615.212800；642.632800；685.363200；723.931200；795.928000；820.589600；819.139200；810.362000；786.772000；746.202800；725.050400；725.472000；682.942800；619.237600；543.622400；478.236400；414.222800；361.934800；315.159200；258.551600；205.046000；165.028400；152.768000；139.290000；114.647600；100.096000。
subtracting the signal value fitted by the Gaussian function corresponding to each channel from the original signal value of each channel, wherein the obtained value is the signal value with the overlapped peak removed; the energy spectrum of the radionuclide K40 element peak after the overlapping peak is removed is shown in FIG. 6.
S102, traversing the peak area of the radionuclide K40, and searching the position of the maximum value of the peak and the signal value of the peak again;
the peak interval of K40 is within the left and right boundaries of the resulting peak for the first peak finding operation. The maximum value of the signal in the range is a new peak, and the channel in which the signal value is located is the channel of the peak. The first peak searching is carried out, and the left and right ranges of the peaks are 782-890; the maximum value of the new peak in this range is 387.259, the signal value of the new peak; the corresponding channel is 826. As shown in fig. 7, the vertical line in the figure is the channel of the new peak.
S103, determining a signal value of the full width at half maximum according to the signal value of the new peak after the overlapping peak is newly removed, and then judging a channel where the signal of the full width at half maximum of the new peak is located:
if the overlapping peak is to the right of the radionuclide peak, the first signal value is ≦ Y 'for a look-up to the left from the new peak position' max And 2, the channel corresponding to the point is the channel where the full width at half maximum signal value is located.
If the overlapping peak is to the left of the radionuclide peak, the first signal value ≦ Y 'looking to the right from the re-peak position' max And/2, the channel corresponding to the point is the channel where the full width at half maximum signal value is located.
In this embodiment example, Y' max =387.259; since the overlapping peak is to the right of the peak of the first peak search of radionuclide K40, the first point to the left is found to be less than 193.6295 and the signal value is 178 on channel 806. As shown in fig. 8, the vertical line in the graph is the channel where the full width at half maximum signal of the new peak is located.
S104, calculating the full width at half maximum and the peak boundary of the new peak;
if the overlapping peak is to the right of the radionuclide K40 element peak, the full width at half maximum of the new peak = the channel where the new peak is located-the channel where the full width at half maximum signal value is located. The channel at the left boundary of the peak is the channel at the left boundary obtained by the first peak finding, and the channel at the right boundary =2 × the channel at the new peak-the channel at the left boundary.
If the overlapping peak is to the left of the radionuclide K40 element peak, the full width at half maximum of the new peak = the channel where the full width at half maximum signal value is located-the channel where the new peak is located. The channel where the left and right boundaries of the peak are located is the channel where the right boundary is located obtained by first peak finding, and the channel where the left boundary is located =2 × the channel where the new peak is located — the channel where the right boundary is located.
Full width at half maximum =826-806=20
The original left border is 782, so the left border of the new peak =782; the right boundary of the new peak =2 × 826-782=870;
s105, fitting a Gaussian function according to the signal value and the full width at half maximum of the new peak, wherein the fitted peak is the peak searched for the radionuclide K40 twice;
calculating a Gaussian function of the new peak according to the channel, the signal value and the full width at half maximum of the new peak;
wherein: s is 2 × half-width squared =2 × (20) × (20) =800; x' i Refers to the ith channel; y is i Is the count value of the ith channel; x' max The channel in which the peak of the new peak is located is Y' max The peak of the new peak. In this embodiment example, X' max ＝826；Y′ max ＝387.259
In this embodiment, the fitted gaussian function curve is shown as e in fig. 9, and the next calculation is performed according to the curve data of the new peak.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A secondary peak searching method for detecting radionuclides in seawater is characterized by comprising the following steps:
(1) Searching a peak of the radionuclide and an overlapping peak, and removing the overlapping peak;
(2) Traversing peak regions of the radioactive nuclide, and searching the maximum signal value again; wherein, the peak area of the radioactive nuclide is the left and right boundary range of the peak obtained by the first peak searching; the maximum value of the signal in the range is the signal value of the new peak, and the channel where the signal value is located is the channel of the new peak;
(3) Determining a signal value of the full width at half maximum of the new peak according to the signal value of the new peak, and then judging a channel where the signal of the full width at half maximum of the new peak is located:
if the overlapping peak is to the right of the radionuclide peak, the first signal value is ≦ Y 'looking to the left from the position of the new peak' max A point of/2, a channel corresponding to the point is a channel where the full width at half maximum signal value is located;
if the overlapping peak is to the left of the radionuclide peak, looking to the right from the position of the new peak, the first signal value is ≦ Y' max At the point of/2, the channel corresponding to the point is the channel where the full width at half maximum signal value is located;
wherein: y' max 2 is the half-high signal value of the new peak;
(4) Calculating the half-height width and peak boundary of a new peak:
if the overlapping peak is to the right of the radionuclide peak, the full width at half maximum of the new peak = the channel where the new peak is located-the channel where the full width at half maximum signal value is located; the channel where the left boundary of the peak is the channel where the left boundary is obtained by first peak finding, and the channel where the right boundary is =2 × the channel where the new peak is-the channel where the left boundary is;
if the overlapping peak is to the left of the radionuclide peak, the full width at half maximum of the new peak = the channel where the full width at half maximum signal value is located-the channel where the new peak is located; the channel where the right boundary of the peak is located is the channel where the right boundary is located obtained by first peak finding, and the channel where the left boundary is located =2 × the channel where the new peak is located — the channel where the right boundary is located;
(5) Fitting a Gaussian function according to the signal value of the new peak and the full width at half maximum, and finding the peak for the radionuclide twice by the fitted peak.
2. The secondary peak-finding method for detecting radionuclides in seawater according to claim 1, wherein in the step (1), the method for removing the overlapping peaks comprises:
(a) Judging a channel where the half-height-width signal value of the overlapping peak is located;
(b) Calculating a Gaussian function of the overlapped peaks;
(c) Traversing all channels of the peak interval of the radioactive nuclide, calculating the signal value of the Gaussian function corresponding to each channel, and subtracting the signal value of the corresponding Gaussian function from the original signal value of the channel.
3. The secondary peak-finding method for detecting radionuclides in seawater of claim 2, wherein the step (a) of determining the channel where the half-height-width signal value of the overlapping peak is located comprises:
if the overlapping peak is on the right side of the radionuclide peak, looking up from the peak position of the overlapping peak to the right side, the first signal value is less than or equal to Y max A point/2, wherein the channel corresponding to the point is the channel where the full width at half maximum signal value is located;
if the overlapping peak is on the left side of the radionuclide peak, the first signal value is less than or equal to Y by searching the peak position of the overlapping peak to the left side max At the point of/2, the channel corresponding to the point is the channel where the full width at half maximum signal value is located;
wherein: y is max And/2 is the half-high signal value of the overlapping peak.
4. The secondary peak-finding method for detecting radionuclides in seawater of claim 3, wherein the Gaussian function of the overlapping peaks in step (b) is:
wherein, Y max Peak signal values for overlapping peaks, X max The peak channel of the overlapping peak is the peak channel of the Gaussian fitting function of the overlapping peak, S/2 is the square value of the half-width of the overlapping peak fitting, X i As channel values of the fitted curve, Y i The signal values corresponding to the fitted curve channels.
5. The secondary peak-finding method for detecting radionuclides in seawater of claim 1, wherein in step (5), a gaussian function is fitted according to the signal value and the full width at half maximum of the new peak, and the peak thus fitted is the peak found for the radionuclides in the secondary peak-finding process; the gaussian function is as follows:
′
wherein, Y max Peak signal value of new peak, X ′ max Is the peak channel of the new peak, S'/2 is the square value of the fitted full width at half maximum of the new peak,
′
X i ′ as channel values of the fitted curve, Y i And fitting the signal value corresponding to the curve channel.
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