CN113009544B - Method for judging peak range of radionuclide in seawater - Google Patents
Method for judging peak range of radionuclide in seawater Download PDFInfo
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- CN113009544B CN113009544B CN202110207932.3A CN202110207932A CN113009544B CN 113009544 B CN113009544 B CN 113009544B CN 202110207932 A CN202110207932 A CN 202110207932A CN 113009544 B CN113009544 B CN 113009544B
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Abstract
The invention belongs to the technical field of seawater monitoring, and relates to a method for judging a peak range of a seawater radionuclide. The method comprises the following steps: (1) traversing the signal values of the calibrated radionuclide peaks, and amplifying each signal value; (2) traversing channels of the radionuclide energy spectrum, wherein the traversal range is from 0 th channel to (1023-n) th channel, and n is the number of channels in the calibrated radionuclide peak range; (3) calculating and recording the distance d between the signal values of all the channels of the radioactive nuclide and the signal value of the channel corresponding to the calibrated radioactive nuclide peak; (4) calculation of the left boundary c of the radionuclide peakl(ii) a (5) Calculating the right boundary c of the radionuclide peakr＝cl+n；(6)clAnd crThe range between is the range of the radionuclide peak. The method of the invention adopts the range of the calibrated radionuclide peak as the reference, accurately judges the range of the radionuclide peak monitored on site, and improves the efficiency and the accuracy of the on-site real-time peak searching.
Description
Technical Field
The invention belongs to the technical field of seawater monitoring, and relates to a method for judging a peak range of a seawater radionuclide.
Background
In the comprehensive measurement process of the ocean radioactive substances, if corresponding radioactive substances exist, corresponding peaks appear in corresponding energy intervals. The existing method for monitoring the radioactive environment of seawater is generally based on the premise that a monitoring signal corresponding to a radioactive substance to be detected in seawater is stable or time-invariant, and is not suitable for a complex marine environment.
The actual ocean field monitoring environment is complex and changeable, and the interference factors are many. In the actual operation process, the interference of the change of the marine environment on the measurement of marine substances is found, and the phenomenon is that the amplitude of a monitored voltage signal can change irregularly, so that the real position of a radionuclide peak is difficult to find quickly. For the above reasons, the existing range method for monitoring the peak of radioactive substance in seawater has no accuracy. Usually, in the real-time monitoring process of the radionuclide, a plurality of peaks, including false peaks, superimposed peaks and error peaks caused by interference data, appear. Therefore, on-site measurement needs to find a method to find a drift peak and determine a channel corresponding to the peak on the basis of accurately judging the peak corresponding to the radionuclide.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for judging the peak range of a seawater radionuclide, which can judge a peak channel after peak shift on the basis of measuring the radionuclide peak so as to achieve the aim of improving the peak searching efficiency and accuracy.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for judging the peak range of a seawater radionuclide comprises the following steps:
(1) traversing the signal value of the calibrated radionuclide peak, and amplifying each signal value;
(2) traversing channels of the radionuclide energy spectrum, wherein the traversal range is from 0 th channel to (1023-n) th channel, and n is the number of channels in the calibrated radionuclide peak range;
(3) calculating the distance between the signal value of all the channels of the radioactive nuclide and the signal value of the channel corresponding to the calibrated radioactive nuclide peak, and recording;
(4) calculation of the left boundary c of the radionuclide peakl；
(5) Calculating the right boundary c of the radionuclide peakr＝cl+n；
(6)clAnd crThe range between is the range of the radionuclide peak.
In the above scheme, in the step (1), each signal value of the calibrated radionuclide peak is multiplied by a multiple of b-t2/t1，t1Calibrating the accumulated time for the laboratory; t is t2To monitor the time of accumulation of marine radionuclides in situ.
In the above scheme, in the step (3), the calculation formula of the distance d is as follows;
wherein, aiFor real-time field monitoring of signal value corresponding to each channel in the interval from traversed channel i to (i + n-1), bkThe signal value of the k channel of the calibrated radionuclide peak is k which is 1,2, 3 … …, n; a isiAnd bkOne-to-one correspondence is realized; n is the number of channels in the range of the calibrated radionuclide peak.
In the above scheme, the left boundary c of the radionuclide peak in the step (4)lThe calculation method comprises the following steps: finding the channel corresponding to the minimum distance value, if dmin/t2R is less than R, R is a threshold value, the channel corresponding to the minimum distance is the left boundary cl。
In the above scheme, the method for determining the threshold R is as follows: and taking two known radioactive nuclides, calibrating one radioactive nuclide, and calculating the upper and lower 5% of the minimum distance value between the peak range of the other radioactive nuclide and the peak range of the calibrated radioactive nuclide.
According to the method for judging the peak range of the seawater radionuclide peak, the range of the radionuclide peak which is monitored on site is accurately judged by taking the range of the calibrated radionuclide peak in a laboratory as a reference, the limit of accumulation time is avoided, the range interval in which the radionuclide peak is located can be quickly judged, the measurement error caused by interference of marine environment is eliminated, and the efficiency and the accuracy of real-time peak searching on site are improved.
Drawings
FIG. 1 is a schematic flow chart of a method for determining peak ranges of radionuclides in seawater according to an embodiment of the present disclosure;
FIG. 2 is a graph of spectral data for all channels of real-time on-site radioactivity monitoring disclosed in the embodiments of the present invention;
FIG. 3 is a peak of a 9 minute cumulative calibration radionuclide disclosed in an embodiment of the present invention;
FIG. 4 is a plot of the cumulative time disclosed in the example of the present invention scaled to a calibrated radionuclide peak consistent with real-time monitoring;
FIG. 5 is a graph of radioactivity profiling measured in real-time using calibrated peaks, as disclosed in an example of the present invention.
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 method for judging the peak range of a radionuclide in seawater, which comprises the following specific steps as shown in figure 1:
s101, traversing element signal values of the calibrated nuclide peak, and multiplying each signal value by a corresponding multiple to enable the accumulation time to be consistent with the accumulation time of the current radionuclide energy spectrum. The energy spectrum data curve of all the channels for on-site real-time monitoring of radioactivity is shown in fig. 2, and the calibrated nuclide peak is the position range of the peak corresponding to the nuclide obtained by calibration after the sensor is calibrated by a laboratory, as shown in fig. 3. Laboratory calibration cumulative time t1(ii) a On-site monitoring of radionuclides in seawater with an integration time t2Multiplying the signal value of the peak of the calibration nuclide by a factor b-t2/t1。
In the embodiment, the accumulation time of system calibration is 9 minutes, and the channels of the calibration radionuclide peak range are 770-849; using signal values of channels within a calibrated radionuclide peak rangeAnd removing channels in the peak range of the radionuclide in the seawater monitored in real time. Real-time monitoring of the data for the marine radionuclide is accumulating for 3 hours, so b-t2(iv)/9 ═ 3 × 60/9 ═ 20; it is necessary to amplify the signal value of each channel of the calibration data by 20 times, as shown in fig. 4.
S102, traversing channels of the radioactive energy spectrum, wherein the number of the channels ranges from the 0 th channel to the 1023-calibration peak; 1024 channels are monitored in real time on site, from channel 0 to channel 1023, the laboratory-calibrated radionuclide peaks range from n channels, and the range of traversal ranges from channel 0 to channel 1023-n.
In this embodiment, the system targets radionuclides in the range 770-849, and n is 80, so 0-943 channels are traversed.
S103, calculating and recording the distances of all signals of channels corresponding to the radioactive nuclide and the standard nuclide peak;
distance:
wherein, aiFor the field real-time monitoring of the corresponding signal value of each channel in the interval from the traversed channel i to (i + n-1), bkThe signal value of the k channel of the calibrated radionuclide peak is k which is 1,2, 3 … …, n; a is aiAnd bkOne-to-one correspondence is realized; n is the number of channels in the range of the calibrated radionuclide peak.
In the present embodiment, n is 80, and d is calculated separately0，d1，……，d1023-nEach distance d is calculated over 80 channels, d0Traversing channels 0-79; d1Traversing the 1 st to 80 th channels; d2Traversing 2-81 channels; d943943-1022 channels.
For example:
s104, traversing again, comparing the distances and searching a channel corresponding to the minimum distance; if the distance minimum divided by the cumulative time (in minutes) is less than the threshold R, the traversal ranges from channel 0 to channel 1023-n, find d0，d1，……，d1023-n(ii) a The channel where the minimum is located is denoted as cl。
The method for determining the threshold R comprises the following steps: and taking two known radioactive nuclides, calibrating the two known radioactive nuclides by using one radioactive nuclide, and calculating the upper and lower 5% of the minimum distance value between the peak range of the other radioactive nuclide and the peak range of the calibrated radioactive nuclide.
In the present embodiment, R takes a value of 2. Minimum value of d636＝146.55，146.55/180<2; so clIs 636;
s105, calculating the right boundary of the radionuclide peak; the right border of the radionuclide peak is cr＝cl+ n. n is the number of channels in the peak range of the radionuclide calibrated in the laboratory.
In the present embodiment, n is 80, so cr＝clAnd 716 channels.
S106, the range surrounded by the left channel and the right channel is the range of the radionuclide peak, namely clAnd crThe extent between the channels.
The channel with the smallest distance in this embodiment is 636 channels and meets the threshold requirement, so the radionuclide peaks are found in the range of 636 channels to 716 channels, as shown in fig. 5, the left peak is the range of the radionuclide peak determined by the method of the present invention, and the right peak is the calibrated radionuclide 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 (1)
1. A method for judging the peak range of a seawater radionuclide is characterized by comprising the following steps:
(1) traversing the signal values of the calibrated radionuclide peaks, and amplifying each signal value;
(2) traversing channels of the radionuclide energy spectrum, wherein the traversal range is from 0 th channel to (1023-n) th channel, and n is the number of channels in the calibrated radionuclide peak range;
(3) calculating and recording the distance d between the signal values of all the channels of the radioactive nuclide and the signal value of the channel corresponding to the calibrated radioactive nuclide peak; the calculation formula of the distance d is as follows;
wherein, aiFor real-time field monitoring of signal value corresponding to each channel in the interval from traversed channel i to (i + n-1), bkThe signal value of the kth channel of the radionuclide peak is calibrated, and k is 1,2, 3 … …, n; a isiAnd bkOne-to-one correspondence is realized; n is the number of channels in the calibrated radionuclide peak range;
(4) calculation of the left boundary c of the radionuclide peakl: finding the channel corresponding to the minimum distance value, if dmin/t2R is less than R, R is a threshold value, the channel corresponding to the minimum distance is the left boundary cl；
(5) Calculating the right boundary c of the radionuclide peakr＝cl+n；
(6)clAnd crThe range between is the range of the radionuclide peak;
in the step (1), each signal value of the calibrated radionuclide peak is multiplied by a multiple b-t2/t1；t1Calibrating the accumulated time for the laboratory; t is t2Monitoring the cumulative time of the radionuclide in the seawater on site;
the method for determining the threshold R comprises the following steps: and taking two known radioactive nuclides, calibrating one radioactive nuclide, and calculating the upper and lower 5% of the minimum distance value between the peak range of the other radioactive nuclide and the peak range of the calibrated radioactive nuclide.
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