Personal radiation dose monitoring method and device

Abstract

The embodiment of the invention provides a personal radiation dose monitoring method and device. The method comprises the following steps: acquiring and recording dose rate data and position data uploaded in a radiation area after a person wears a personal dosimeter; then, according to the recorded position data, a real-time movement track of the person in the radiation area is generated, and according to the recorded dose rate data, the radiation dose of the person moving along the real-time movement track in the radiation area is calculated; and finally, judging whether the calculated radiation dose exceeds the limit or not, and if the radiation dose exceeds the limit, giving an alarm for reminding. Therefore, according to the invention, the radiation dose of the personnel moving in the radiation area after startup can be calculated in real time, so that the cause of the event can be accurately traced.

Description

Technical Field

[0001] The present invention relates to the field of radiation protection technology, and in particular to a method and device for monitoring personal radiation dose. Background Art

[0002] At present, the management of radiation dose for hospital radiation workers is mainly through wearing personal dose alarms, which have the function of displaying cumulative dose and dose rate; however, in the management of daily radiation dose, it is difficult to accurately trace the cause of radiation overdose events. Although the prior art (CN108931803A) currently introduces wireless positioning technology on the basis of personal dose alarms, which can realize the location positioning and historical trajectory management of radiation workers, since personal dose alarms are usually composed of Geiger counters, the cumulative dose recorded by them is the sum of pulse counts of discharge pulses generated by Geiger counters, and only the cumulative dose recorded from the start-up time to the current time is displayed, and the cumulative dose of any time period after the start-up cannot be displayed. If the radiation worker exceeds the radiation limit in a short period of time and the total cumulative dose is not exceeded, the cause of the event cannot be accurately traced. Summary of the invention

[0003] In order to solve the problems existing in the above-mentioned prior art, a personal radiation dose monitoring method is provided, which can obtain the cumulative dose in any time period after power-on, so as to accurately trace the cause of the event and clarify the responsibility.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A method for monitoring personal radiation dose, comprising:

[0006] Acquire and record the dose rate data and location data uploaded by personnel wearing personal dosimeters in the radiation area; the acquired dose rate data and location data both carry time markers;

[0007] Generate a real-time motion trajectory of the person in the radiation area based on the recorded position data, and calculate the radiation dose received by the person moving along the real-time motion trajectory in the radiation area based on the recorded dose rate data;

[0008] Also, determine whether the calculated radiation dose exceeds the limit, and if so, issue an alarm.

[0009] According to a specific embodiment, in the personal radiation dose monitoring method provided by the present invention, the cumulative dose of radiation received by a person moving along the motion trajectory in the radiation area is calculated based on the recorded dose rate data as follows:

[0010] Establishing a dose rate reference database; wherein the dose rate reference database stores position data of a plurality of different test motion trajectories and dose rate data generated by the personal dosimeter when moving along each test motion trajectory;

[0011] Fitting the motion trajectory according to the position data of the test motion trajectory stored in the dose rate reference database to generate a simulated motion trajectory, and generating a corresponding dose rate reference curve according to the dose rate data corresponding to the simulated motion trajectory;

[0012] generating a first dose rate variation curve according to the recorded dose rate data, and correcting the first dose rate variation curve using the dose rate reference curve to obtain a second dose rate variation curve;

[0013] An integration operation with respect to time is performed on the second dose rate variation curve to calculate the radiation dose.

[0014] According to a specific implementation, in the personal radiation dose monitoring method provided by the present invention, the motion trajectory is fitted according to the position data of the test motion trajectory stored in the dose rate reference database to generate a simulated motion trajectory in the following manner:

[0015] If the similarity between the test motion trajectory and the motion trajectory reaches a set threshold, the test motion trajectory is used as the simulated motion trajectory; otherwise, the motion trajectory is segmentedly fitted using position data of multiple test motion trajectories, and each segment of the fitted motion trajectory is spliced ​​into the simulated motion trajectory.

[0016] According to a specific embodiment, in the personal radiation dose monitoring method provided by the present invention, the first dose rate change curve is corrected using the dose rate reference curve to obtain the second dose rate change curve by comparing the deviation between the first dose rate change curve and the dose rate reference curve; if the deviation does not exceed a set range, the second dose change curve takes the dose rate data corresponding to the first dose rate change curve; otherwise, the second dose change curve takes the dose rate data corresponding to the dose rate reference curve.

[0017] According to a specific implementation, in the personal radiation dose monitoring method provided by the present invention, if the calculated radiation dose exceeds the limit, the real-time motion trajectory is marked as an over-limit motion trajectory.

[0018] The present invention also provides an electronic device, characterized in that it comprises:

[0019] The data acquisition and recording module is used to acquire and record the dose rate data and position data uploaded by the personnel wearing the personal dosimeter in the radiation area; wherein the acquired dose rate data and position data both carry a time mark;

[0020] The motion trajectory management module is used to generate the real-time motion trajectory of personnel in the radiation area based on the recorded position data;

[0021] The cumulative dose calculation module is used to calculate the radiation dose received by the personnel moving along the real-time motion trajectory in the radiation area according to the recorded dose rate data;

[0022] The over-limit alarm module is used to determine whether the calculated radiation dose exceeds the limit. If it does, an alarm will be issued.

[0023] According to a specific embodiment, in the electronic device provided by the present invention, the cumulative dose calculation module is configured with a dose rate reference database; wherein the dose rate reference database stores position data of a plurality of different test motion trajectories and dose rate data generated by the personal dosimeter when moving along each test motion trajectory;

[0024] Moreover, the cumulative dose calculation module is used to fit the motion trajectory according to the position data of the test motion trajectory stored in the dose rate reference database to generate a simulated motion trajectory, and generate a corresponding dose rate reference curve according to the dose rate data corresponding to the simulated motion trajectory; and to generate a first dose rate change curve according to the recorded dose rate data, and to correct the first dose rate change curve using the dose rate reference curve to obtain a second dose rate change curve; and to perform an integral operation on the second dose rate change curve with respect to time to calculate the radiation dose.

[0025] According to a specific embodiment, in the electronic device provided by the present invention, the cumulative dose calculation module is also used to use the test motion trajectory as the simulated motion trajectory when the similarity between the test motion trajectory and the motion trajectory reaches a set threshold; otherwise, the motion trajectory is segmentedly fitted using position data of multiple test motion trajectories, and each segment of the fitted motion trajectory is spliced ​​into the simulated motion trajectory.

[0026] According to a specific embodiment, in the electronic device provided by the present invention, the cumulative dose calculation module is used to compare the deviation between the first dose rate change curve and the dose rate reference curve. If the deviation does not exceed a set range, the second dose change curve takes the dose rate data corresponding to the first dose rate change curve; otherwise, the second dose change curve takes the dose rate data corresponding to the dose rate reference curve.

[0027] According to a specific implementation, in the electronic device provided by the present invention, the motion trajectory management module is used to mark the real-time motion trajectory as an out-of-limit motion trajectory when it is calculated that the radiation dose exceeds the limit.

[0028] Through the above scheme, the present invention obtains and records the dose rate data and position data uploaded by the personnel wearing the personal dosimeter in the radiation area, and calculates in real time the radiation dose received by the personnel moving in the radiation area after the device is turned on, thereby accurately tracing the cause of the event; moreover, it further solves the problem of affecting the accuracy of the calculated cumulative dose due to the inconsistency between the data rate of the dose rate data and position data transmitted by the personal dosimeter and the dose rate data generated by the personal dosimeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of a personal radiation dose monitoring system built in a radiation area according to the present invention;

[0030] Figure 2 A schematic diagram of the process of the present invention;

[0031] Figure 3 It is a schematic diagram of a situation of the motion trajectory fitting process in the method of the present invention;

[0032] Figure 4 It is another schematic diagram of the motion trajectory fitting process in the method of the present invention;

[0033] Figure 5 It is a schematic diagram comparing the real-time variation curve of dose rate with the reference curve of dose rate;

[0034] Figure 6 It is a structural schematic diagram of the device of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] like Figure 1As shown, a personal radiation dose monitoring system is set up in the radiation area of ​​the hospital, which is composed of a server 100 and several base stations 200 arranged in the radiation area; wherein, the personal dosimeter 300 worn by the personnel uploads the dose rate data and the position data through the base station 200; specifically, the personal dosimeter 300 includes a Geiger counter, and the cumulative dose is obtained by counting the number of pulse discharges output by the Geiger counter, and the dose rate is calculated in real time according to the obtained cumulative dose; at the same time, the personal dosimeter 300 also includes a positioning tag and a wireless communication module, the positioning tag communicates with the base station 200 by UWB, the base station calculates the position data of the personal dosimeter 300 and uploads it to the server 100, and the wireless communication module communicates wirelessly with the base station 200, and after the dose rate calculated by the personal dosimeter 300 is sent to the base station 200, it is uploaded to the server 100 by the base station 200.

[0038] At the same time, in order to verify whether the identity information of the person wearing the personal dosimeter is true, a plurality of monitoring cameras 400 are set in the radiation area, and these monitoring cameras 400 collect video images in the radiation area and upload the video data to the server 100 for processing. The server 100 recognizes the face of the person based on the video images collected by the monitoring cameras 400, thereby verifying the identity of the person in the radiation area; once the identity calibrated by the personal dosimeter 300 is inconsistent with the identity recognized by the video image, the server 100 will issue an alarm and record it as an abnormal identity event; in addition, the position of the monitoring camera 400 in the radiation area is calibrated, and the position data of the personal dosimeter 300 is combined for auxiliary judgment. For example, if the position data of the personal dosimeter 300 is within the monitoring range of a certain monitoring camera 400, but no human body appears in the video image of the monitoring camera 400, it indicates that the personal dosimeter 300 has been left behind. At this time, the server 100 will issue an alarm and record it as a personal dosimeter left behind event.

[0039] like Figure 2 As shown, on the basis of building a personal radiation dose monitoring system, a personal radiation dose monitoring method provided by the present invention is implemented on the server 100, which includes:

[0040] Acquire and record the dose rate data and location data uploaded by personnel wearing personal dosimeters in the radiation area; the acquired dose rate data and location data both carry time markers;

[0041] Generate a real-time motion trajectory of the person in the radiation area based on the recorded position data, and calculate the radiation dose received by the person moving along the real-time motion trajectory in the radiation area based on the recorded dose rate data;

[0042] Also, determine whether the calculated radiation dose exceeds the limit, and if so, issue an alarm.

[0043] Specifically, based on the recorded dose rate data, the radiation dose received by a person moving along the real-time motion trajectory in the radiation area is calculated as follows:

[0044] First, a dose rate reference database is established; wherein the dose rate reference database stores position data of a plurality of different test motion trajectories and dose rate data generated by a personal dosimeter when moving along each test motion trajectory; during implementation, the personal dosimeter is worn on a mobile robot, and then the motion trajectory data generated by a simulated person in various working conditions in a radiation area are downloaded to a motion controller of the mobile robot, so that the mobile robot moves in the radiation area along various trajectories. At the same time, the personal dosimeter stores the dose rate data under each motion trajectory, thereby generating a dose rate reference curve corresponding to each test motion trajectory.

[0045] Next, fitting the real-time motion trajectory according to the position data of the test motion trajectory stored in the dose rate reference database to generate a simulated motion trajectory, and generating a corresponding dose rate reference curve according to the dose rate data corresponding to the simulated motion trajectory;

[0046] Next, a first dose rate variation curve is generated according to the recorded dose rate data, and the first dose rate variation curve is corrected using the dose rate reference curve to obtain a second dose rate variation curve;

[0047] Finally, the second dose rate variation curve is integrated with respect to time to calculate the radiation dose. Since the radiation dose received by the person moving along the real-time motion trajectory in the radiation area is calculated by integrating the dose rate variation curve with respect to time, the radiation dose within any time window set by the system user can be directly calculated.

[0048] Specifically, the motion trajectory is fitted according to the position data of the test motion trajectory stored in the dose rate reference database to generate a simulated motion trajectory in the following manner:

[0049] If the similarity between the test motion trajectory and the motion trajectory reaches a set threshold, the test motion trajectory is used as the simulated motion trajectory, that is, Figure 3 As shown in the figure, trajectory 1 is the motion trajectory, and trajectory 2 is the test motion trajectory. The similarity between trajectory 1 and trajectory 2 is characterized by the Euclidean distance between the trajectories. The Euclidean distance between trajectory 1 and trajectory 2 meets the set threshold requirement, that is, trajectory 2 is used as the simulated motion trajectory of trajectory 1 at this time. Then, the dose rate reference curve is generated by the dose rate data corresponding to trajectory 2.

[0050] If the similarity between all the test motion trajectories and the motion trajectory does not reach the set threshold, the position data of multiple test motion trajectories are used to fit the motion trajectory in sections, and each section of the fitted motion trajectory is spliced ​​into the simulated motion trajectory; that is, Figure 4 As shown, trajectory 1 is a motion trajectory, and trajectory 4, trajectory 3 and trajectory 2 are all different test motion trajectories. At this time, partial position data of trajectory 4, trajectory 3 and trajectory 2 are used to perform segmented fitting on trajectory 1. Correspondingly, the dose rate data corresponding to the segmented fitting part of trajectory 4, trajectory 3 and trajectory 2 on trajectory 1 are synthesized into a dose rate reference curve.

[0051] Specifically, Figure 5 As shown, the first dose rate change curve is corrected by using the dose rate reference curve to obtain the second dose rate change curve by comparing the deviation between the first dose rate change curve and the dose rate reference curve; if the deviation does not exceed the set range, the second dose change curve takes the dose rate data corresponding to the first dose rate change curve; otherwise, the second dose change curve takes the dose rate data corresponding to the dose rate reference curve.

[0052] Specifically, in the personal radiation dose monitoring method provided by the present invention, if the calculated cumulative dose reaches a set alarm threshold, the motion trajectory is marked as an out-of-limit motion trajectory.

[0053] The present invention also provides an electronic device, characterized in that it comprises:

[0054] The data acquisition and recording module 101 is used to acquire and record the dose rate data and position data uploaded by the personnel wearing the personal dosimeter in the radiation area; wherein the acquired dose rate data and position data both carry a time mark;

[0055] The motion trajectory management module 102 is used to generate the motion trajectory of the personnel in the radiation area according to the recorded position data;

[0056] The cumulative dose calculation module 103 is used to calculate the cumulative dose of radiation received by the person moving along the motion trajectory in the radiation area according to the recorded dose rate data;

[0057] The over-limit alarm module 104 is used to determine whether the calculated radiation dose exceeds the limit, and if so, issue an alarm.

[0058] In the electronic device provided by the present invention, the cumulative dose calculation module is configured with a dose rate reference database; wherein the dose rate reference database stores position data of a plurality of different test motion trajectories and dose rate data generated by the personal dosimeter when moving along each test motion trajectory;

[0059] Moreover, the cumulative dose calculation module is used to fit the motion trajectory according to the position data of the test motion trajectory stored in the dose rate reference database to generate a simulated motion trajectory, and to generate a corresponding dose rate reference curve according to the dose rate data corresponding to the simulated motion trajectory; and to generate a first dose rate change curve according to the recorded dose rate data, and to correct the first dose rate change curve using the dose rate reference curve to obtain a second dose rate change curve; and to perform an integral operation on the second dose rate change curve to calculate the cumulative dose.

[0060] In the electronic device provided by the present invention, the cumulative dose calculation module is also used to use the test motion trajectory as the simulated motion trajectory when the similarity between the test motion trajectory and the motion trajectory reaches a set threshold; otherwise, the motion trajectory is segmentedly fitted using position data of multiple test motion trajectories, and each segment of the fitted motion trajectory is spliced ​​into the simulated motion trajectory.

[0061] In the electronic device provided by the present invention, the cumulative dose calculation module is used to compare the deviation between the first dose rate change curve and the dose rate reference curve. If the deviation does not exceed the set range, the second dose change curve takes the dose rate data corresponding to the first dose rate change curve; otherwise, the second dose change curve takes the dose rate data corresponding to the dose rate reference curve.

[0062] In the electronic device provided by the present invention, the motion trajectory management module is used to mark the motion trajectory as an out-of-limit motion trajectory when the calculated cumulative dose reaches a set alarm threshold.

[0063] In summary, the present invention obtains and records the dose rate data and position data uploaded by the personnel wearing the personal dosimeter in the radiation area, and calculates in real time the radiation dose received by the personnel moving in the radiation area after the device is turned on, thereby accurately tracing the cause of the event; moreover, it further solves the problem of the accuracy of the calculated cumulative dose being affected by the inconsistency between the data rate of the dose rate data and position data transmitted by the personal dosimeter and the dose rate data generated by the personal dosimeter.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for monitoring personal radiation dose, characterized in that: include: Acquire and record the dose rate data and location data uploaded by personnel wearing personal dosimeters in the radiation area; the acquired dose rate data and location data both carry time markers; Generate a real-time motion trajectory of the person in the radiation area based on the recorded position data, and calculate the radiation dose received by the person moving along the real-time motion trajectory in the radiation area based on the recorded dose rate data; Also, determine whether the calculated radiation dose exceeds the limit, and if so, issue an alarm.

2. The personal radiation dose monitoring method according to claim 1, characterized in that: The method for calculating the radiation dose received by a person moving along the real-time motion trajectory in the radiation area is as follows: Establishing a dose rate reference database; wherein the dose rate reference database stores position data of a plurality of different test motion trajectories and dose rate data generated by the personal dosimeter when moving along each test motion trajectory; Fitting the real-time motion trajectory according to the position data of the test motion trajectory stored in the dose rate reference database to generate a simulated motion trajectory, and generating a corresponding dose rate reference curve according to the dose rate data corresponding to the simulated motion trajectory; generating a first dose rate variation curve according to the recorded dose rate data, and correcting the first dose rate variation curve using the dose rate reference curve to obtain a second dose rate variation curve; An integration operation with respect to time is performed on the second dose rate variation curve to calculate the radiation dose.

3. The personal radiation dose monitoring method according to claim 2, characterized in that: The method of fitting the real-time motion trajectory according to the position data of the test motion trajectory stored in the dose rate reference database to generate a simulated motion trajectory is as follows: If the similarity between the test motion trajectory and the real-time motion trajectory reaches a set threshold, the test motion trajectory is used as the simulated motion trajectory; otherwise, the real-time motion trajectory is segmentedly fitted using position data of multiple test motion trajectories, and each segment of the fitted motion trajectory is spliced ​​into the simulated motion trajectory.

4. The personal radiation dose monitoring method according to claim 3, characterized in that: The first dose rate change curve is corrected by using the dose rate reference curve to obtain the second dose rate change curve by comparing the deviation between the first dose rate change curve and the dose rate reference curve; if the deviation does not exceed the set range, the second dose change curve takes the dose rate data corresponding to the first dose rate change curve; otherwise, the second dose change curve takes the dose rate data corresponding to the dose rate reference curve.

5. The personal radiation dose monitoring method according to claim 1, characterized in that: If it is calculated that the radiation dose exceeds the limit, the real-time motion trajectory is marked as an exceeding-limit motion trajectory.

6. An electronic device, characterized in that: include: The data acquisition and recording module is used to acquire and record the dose rate data and position data uploaded by the personnel wearing the personal dosimeter in the radiation area; wherein the acquired dose rate data and position data both carry a time mark; The motion trajectory management module is used to generate the real-time motion trajectory of personnel in the radiation area based on the recorded position data; The cumulative dose calculation module is used to calculate the radiation dose received by the personnel moving along the real-time motion trajectory in the radiation area according to the recorded dose rate data; The over-limit alarm module is used to determine whether the calculated radiation dose exceeds the limit. If it does, an alarm will be issued.

7. The electronic device according to claim 6, wherein: The cumulative dose calculation module is configured with a dose rate reference database; wherein the dose rate reference database stores position data of a plurality of different test motion trajectories and dose rate data generated by the personal dosimeter when moving along each test motion trajectory; Moreover, the cumulative dose calculation module is used to fit the real-time motion trajectory according to the position data of the test motion trajectory stored in the dose rate reference database to generate a simulated motion trajectory, and generate a corresponding dose rate reference curve according to the dose rate data corresponding to the simulated motion trajectory; and to generate a first dose rate change curve according to the recorded dose rate data, and to correct the first dose rate change curve using the dose rate reference curve to obtain a second dose rate change curve; and to perform an integral operation on the second dose rate change curve with respect to time to calculate the radiation dose.

8. The electronic device as claimed in claim 7, characterized in that: The cumulative dose calculation module is also used to use the test motion trajectory as the simulated motion trajectory if the similarity between the test motion trajectory and the real-time motion trajectory reaches a set threshold; otherwise, the real-time motion trajectory is segmentedly fitted using position data of multiple test motion trajectories, and each segment of the fitted motion trajectory is spliced ​​into the simulated motion trajectory.

9. The electronic device as claimed in claim 8, characterized in that: The cumulative dose calculation module is used to compare the deviation between the first dose rate change curve and the dose rate reference curve. If the deviation does not exceed a set range, the second dose change curve takes the dose rate data corresponding to the first dose rate change curve; otherwise, the second dose change curve takes the dose rate data corresponding to the dose rate reference curve.

10. The electronic device according to claim 9, wherein: The motion trajectory management module is used to mark the real-time motion trajectory as an out-of-limit motion trajectory when it is calculated that the radiation dose exceeds the limit.

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