CN-122017938-A - Spectral stabilization method and system for regional radiation monitor

CN122017938ACN 122017938 ACN122017938 ACN 122017938ACN-122017938-A

Abstract

The invention relates to the technical field of radiation monitoring, in particular to a spectrum stabilizing method and system of a regional radiation monitor. The method comprises the steps of obtaining radiation intensity of each monitoring point, obtaining local similarity of each monitoring point at each moment and other moments according to differences of change characteristics of the radiation intensity in a local range of each monitoring point at different moments, obtaining first measurement accuracy by combining the differences of the radiation intensity at different moments, distribution characteristics of equal radiation edge lines and the local similarity of each monitoring point, obtaining second measurement accuracy by combining the position change of a radiation source, the radiation intensity of the radiation source and the distance between the radiation source and the monitoring point, screening abnormal moments by combining the first measurement accuracy and the second measurement accuracy, and correcting the radiation intensity at the abnormal moments by integrating the change index, the local similarity, the first measurement accuracy and the second measurement accuracy of each monitoring point and other monitoring points, so that spectrum stabilizing operation is achieved. The invention improves the spectrum stabilizing effect.

Inventors

SHAO YAHUI
LIANG WANSHENG
LIU JING

Assignees

陕西正泽生物技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260413

Claims (10)

1. A method for stabilizing spectrum of a regional radiation monitor, which is characterized by comprising the following steps: Acquiring radiation intensities of different monitoring points of a monitoring area in a preset time period; The method comprises the steps of respectively projecting the radiation intensity of all monitoring points at each moment to a three-dimensional coordinate system, determining a plurality of equal radiation edge lines in the three-dimensional coordinate system corresponding to each moment based on the radiation intensity, obtaining the local similarity of each moment of each monitoring point and other moments according to the difference of the change characteristics of the radiation intensity in the local range of each moment of each monitoring point, and obtaining the radiation source at each moment and the first measurement accuracy of each moment of each monitoring point by combining the difference of the radiation intensity at different moments of each monitoring point, the distribution characteristics and the local similarity of the equal radiation edge lines; Determining a change index of each monitoring point at each moment according to the position change condition of the radiation source, the radiation intensity of the radiation source and the relative distance between the radiation source and each monitoring point in a preset time period, combining the difference of the change index and the radiation intensity of each moment of different monitoring points to obtain a second measurement accuracy of each moment of each monitoring point, and combining the first measurement accuracy and the second measurement accuracy to screen abnormal moments of the monitoring points; and integrating the change index, the local similarity, the first measurement accuracy and the second measurement accuracy of each monitoring point and each moment of other monitoring points, correcting the radiation intensity at the abnormal moment, and performing spectrum stabilizing operation by utilizing the corrected radiation intensity.
2. The method for spectrum stabilization of regional radiation monitor according to claim 1, wherein the obtaining the local similarity between each time and other time of each monitoring point according to the difference of the change characteristics of the radiation intensity in the local range at different time of each monitoring point comprises: respectively calculating the slope difference of a connecting line between the radiation intensities of two adjacent moments in a neighborhood time window of the first moment and the second moment of the candidate monitoring point; Obtaining local similarity of the first moment and the second moment of the candidate monitoring point according to the difference of radiation intensity and the slope difference between corresponding moments in a neighborhood time window of the first moment and the second moment of the candidate monitoring point, wherein the difference of radiation intensity and the slope difference between the corresponding moments are in negative correlation with the local similarity; The candidate monitoring points are any monitoring point, and the first moment and the second moment are any two moments in a preset time period respectively.
3. The method of spectrum stabilization for a regional radiation monitor according to claim 2, wherein the obtaining the radiation source at each moment by combining the difference of radiation intensity, the distribution characteristics of the equal radiation edge lines and the local similarity at different moments of each monitoring point comprises: For candidate monitoring points: If the equal radiation edge line at the candidate monitoring point to be analyzed is not provided with other equal radiation edge lines, calculating a first difference between the radiation intensity corresponding to the equal radiation edge line at the candidate monitoring point to be analyzed and the radiation intensity corresponding to the equal radiation edge line closest to the equal radiation edge line at the candidate monitoring point to be analyzed, and taking a normalization result of the first difference as the possibility that the candidate monitoring point to be analyzed is the radiation source; If the possibility is larger than a preset possibility threshold, the candidate monitoring points are used as radiation sources at the moment to be analyzed; the time to be analyzed is any time within a preset time period.
4. A method of spectrum stabilization for a regional radiation monitor according to claim 3, wherein the obtaining of the first measurement accuracy for each time of each monitoring point comprises: for candidate monitoring points to be analyzed: Sequencing the local similarity between the candidate monitoring point to-be-analyzed time and other time according to the sequence of the local similarity from large to small to obtain a local similarity sequence of the candidate monitoring point to-be-analyzed time; Obtaining initial accuracy of the candidate monitoring point to-be-analyzed moment according to the local similarity of the candidate monitoring point to-be-analyzed moment and each similar moment and the difference of the radiation intensity of the candidate monitoring point to-be-analyzed moment and each similar moment, wherein the local similarity of the to-be-analyzed moment and each similar moment and the difference of the radiation intensity of the to-be-analyzed moment and each similar moment are in negative correlation with the initial accuracy; For any radiation source, connecting the candidate monitoring points with the radiation source through line segments, sequentially traversing along the line segments by taking the candidate monitoring points as starting points, and forming a monitoring point sequence by the monitoring points on each equal radiation edge line which is passed by all the line segments for the first time; And obtaining the first measurement accuracy of the candidate monitoring point to-be-analyzed time according to the initial accuracy and the distance between the radiation source to which the candidate monitoring point to-be-analyzed time belongs and the radiation source to which each time belongs in the neighborhood time window of the candidate monitoring point to-be-analyzed time.
5. A method for stabilizing spectrum of regional radiation monitor according to claim 3, wherein determining the change index of each monitoring point at each moment according to the position change condition of the radiation source, the radiation intensity of the radiation source and the relative distance between the radiation source and each monitoring point in the preset time period comprises: Adopting normalized mutual information based on Parzen window method as registration algorithm, matching the radiation sources in preset time period, and marking the radiation source with coordinate change at adjacent moment as dynamic radiation source at the next moment; And according to the coordinate distance between each dynamic radiation source and the candidate monitoring point at the moment to be analyzed, the coordinate distance between each dynamic radiation source and the candidate monitoring point at the moment to be analyzed at the moment to be started, and the radiation intensity of each dynamic radiation source at the moment to be analyzed at the moment to be started, the change index of the moment to be analyzed of the candidate monitoring point is obtained.
6. A method for spectrum stabilization of a regional radiation monitor according to claim 3, wherein the step of combining the difference of the change indexes and the difference of the radiation intensities at each moment of different monitoring points to obtain the second measurement accuracy at each moment of each monitoring point comprises: for candidate monitoring points to be analyzed: Calculating second differences of change indexes between candidate detection points and other monitoring points at the moment to be analyzed, arranging all the second differences in sequence from large to small to obtain a second difference sequence, and determining the other monitoring points corresponding to the first preset number of elements in the second difference sequence as similar monitoring points at the moment to be analyzed of the candidate monitoring points; And obtaining second measurement accuracy of the candidate monitoring points at the moment to be analyzed according to the second difference between the candidate monitoring points at the moment to be analyzed and the similar monitoring points and the difference of the radiation intensities of the candidate monitoring points at the moment to be analyzed and the similar monitoring points, wherein the second difference between the candidate monitoring points at the moment to be analyzed and the similar monitoring points and the difference of the radiation intensities of the candidate monitoring points at the moment to be analyzed and the similar monitoring points are in negative correlation with the second measurement accuracy.
7. A method of spectrum stabilization for a regional radiation monitor according to claim 3, wherein the screening for abnormal moments of monitoring points by combining the first measurement accuracy and the second measurement accuracy comprises: Determining the sum of the first measurement accuracy of the candidate monitoring point to-be-analyzed time and the second measurement accuracy of the candidate monitoring point to-be-analyzed time as the comprehensive measurement accuracy of the candidate monitoring point to-be-analyzed time; and if the comprehensive measurement accuracy is smaller than a preset accuracy threshold, judging the moment to be analyzed as the abnormal moment of the candidate monitoring point.
8. The method for spectrum stabilization of regional radiation monitor according to claim 7, wherein the integrating the change index, the local similarity, the first measurement accuracy and the second measurement accuracy at each moment of each monitoring point and other monitoring points, and correcting the radiation intensity at the abnormal moment comprises: calculating a negative correlation normalization result of the difference between a change index of the candidate monitoring point to-be-analyzed moment and a change index of the first abnormal moment, and obtaining a reference degree of the candidate monitoring point to-be-analyzed moment to the first abnormal moment according to the local similarity of the candidate monitoring point to-be-analyzed moment and the first abnormal moment, the comprehensive measurement accuracy of the candidate monitoring point to-be-analyzed moment and the negative correlation normalization result; combining the radiation intensities of all reference moments of the first abnormal moment of the candidate monitoring point to the reference degree of the first abnormal moment and all reference moments of the first abnormal moment of the candidate monitoring point to obtain the radiation intensity corrected by the first abnormal moment of the candidate monitoring point; the first abnormal time is any abnormal time of the candidate monitoring points.
9. The method for stabilizing spectrum of regional radiation monitor according to claim 8, wherein the obtaining the reference degree of the candidate monitoring point to the first abnormal time according to the local similarity between the candidate monitoring point to-be-analyzed time and the first abnormal time, the comprehensive measurement accuracy of the candidate monitoring point to-be-analyzed time and the negative correlation normalization result includes: And determining the product of the local similarity of the candidate monitoring point to-be-analyzed time and the first abnormal time, the comprehensive measurement accuracy of the candidate monitoring point to-be-analyzed time and the negative correlation normalization result as the reference degree of the candidate monitoring point to-be-analyzed time to the first abnormal time.
10. A spectral stability system for a regional radiation monitor, the system comprising: the data acquisition module is used for acquiring radiation intensities of different monitoring points in a monitoring area in a preset time period; The first calculation module is used for respectively projecting the radiation intensity of all the monitoring points at each moment to a three-dimensional coordinate system, determining a plurality of equal radiation edge lines in the three-dimensional coordinate system corresponding to each moment based on the radiation intensity, obtaining the local similarity of each moment of each monitoring point and other moments according to the difference of the change characteristics of the radiation intensity in the local range of each monitoring point at different moments, and obtaining the radiation source at each moment and the first measurement accuracy of each moment of each monitoring point by combining the difference of the radiation intensity, the distribution characteristics and the local similarity of the equal radiation edge lines at different moments of each monitoring point; The abnormal moment screening module is used for determining the change index of each moment of each monitoring point according to the position change condition of the radiation source, the radiation intensity of the radiation source and the relative distance between the radiation source and each monitoring point in a preset time period, combining the difference of the change index of each moment of different monitoring points and the difference of the radiation intensity to obtain the second measurement accuracy of each moment of each monitoring point, and combining the first measurement accuracy and the second measurement accuracy to screen the abnormal moment of the monitoring point; The correction module is used for integrating the change index, the local similarity, the first measurement accuracy and the second measurement accuracy of each monitoring point and each moment of other monitoring points, correcting the radiation intensity at the abnormal moment, and performing spectrum stabilization operation by utilizing the corrected radiation intensity.

Description

Spectral stabilization method and system for regional radiation monitor Technical Field The invention relates to the technical field of radiation monitoring, in particular to a spectrum stabilizing method and system of a regional radiation monitor. Background The regional radiation monitor is used for monitoring the radiation condition of the nuclear medicine department region, when particles or rays pass through the gas, a plurality of ion pairs are generated due to collision ionization, the ion pairs respectively move to two electrodes under the action of an electric field and are collected, at the moment, an electric signal is output on an external circuit, the pulse shaper converts the electric signal into pulse signals, and the counter counts the number of the pulse signals to obtain the radiation intensity. The stable spectrum is used for correcting the spectrum drift phenomenon generated by the monitor, namely the measurement error caused by the change of the spectrum along with the temperature. The existing spectrum stabilization method uses a cubic polynomial function as a temperature correction function to perform energy spectrum processing, but because the problems of ventilation, personnel flow, radiation source movement and the like exist in radiation monitoring areas such as nuclear medicine disciplines, the accuracy of monitoring data acquired by a monitor cannot be determined, and further whether correction values are accurate or not cannot be determined, so that the spectrum stabilization effect cannot be ensured. Disclosure of Invention In order to solve the problem that the existing method cannot guarantee the spectrum stabilizing effect of the radiation monitor, the invention aims to provide a spectrum stabilizing method and system of a regional radiation monitor, and the adopted technical scheme is as follows: In a first aspect, the present invention provides a method for stabilizing a spectrum of a regional radiation monitor, the method comprising the steps of: Acquiring radiation intensities of different monitoring points of a monitoring area in a preset time period; The method comprises the steps of respectively projecting the radiation intensity of all monitoring points at each moment to a three-dimensional coordinate system, determining a plurality of equal radiation edge lines in the three-dimensional coordinate system corresponding to each moment based on the radiation intensity, obtaining the local similarity of each moment of each monitoring point and other moments according to the difference of the change characteristics of the radiation intensity in the local range of each moment of each monitoring point, and obtaining the radiation source at each moment and the first measurement accuracy of each moment of each monitoring point by combining the difference of the radiation intensity at different moments of each monitoring point, the distribution characteristics and the local similarity of the equal radiation edge lines; Determining a change index of each monitoring point at each moment according to the position change condition of the radiation source, the radiation intensity of the radiation source and the relative distance between the radiation source and each monitoring point in a preset time period, combining the difference of the change index and the radiation intensity of each moment of different monitoring points to obtain a second measurement accuracy of each moment of each monitoring point, and combining the first measurement accuracy and the second measurement accuracy to screen abnormal moments of the monitoring points; and integrating the change index, the local similarity, the first measurement accuracy and the second measurement accuracy of each monitoring point and each moment of other monitoring points, correcting the radiation intensity at the abnormal moment, and performing spectrum stabilizing operation by utilizing the corrected radiation intensity. Preferably, the obtaining the local similarity between each time and other time of each monitoring point according to the difference of the change characteristics of the radiation intensity in the local range of different time of each monitoring point includes: respectively calculating the slope difference of a connecting line between the radiation intensities of two adjacent moments in a neighborhood time window of the first moment and the second moment of the candidate monitoring point; Obtaining local similarity of the first moment and the second moment of the candidate monitoring point according to the difference of radiation intensity and the slope difference between corresponding moments in a neighborhood time window of the first moment and the second moment of the candidate monitoring point, wherein the difference of radiation intensity and the slope difference between the corresponding moments are in negative correlation with the local similarity; The candidate monitoring points are any monitoring point,