Large-area radioactive contamination distribution rapid measurement system and method based on optical fiber

Abstract

The present application relates to a kind of large-area radioactive contamination distribution fast measurement system and method based on optical fiber, belong to radioactive contamination measurement technical field, the system includes optical fiber detection subsystem and pollution distribution positioning subsystem, and optical fiber detection subsystem uses scintillation optical fiber to determine the relative position information of radioactive contamination;Pollution distribution positioning subsystem respectively through satellite navigation positioning module and ranging module determines the geographical position information of radioactive contamination, and the distance information of optical fiber detection subsystem and radioactive contamination area;Pollution distribution imaging module is fused by the relative position information of radioactive contamination and spatial position information, finally determines the distribution of radioactive contamination and is displayed.The system and method provided by the present application can realize the monitoring and fast positioning of X, γ, β pollution level of large-scale area pollutant.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of radioactive pollution measurement, and particularly relates to a large-area radioactive pollution distribution rapid measurement system and method based on optical fibers. BACKGROUND

[0002] Nuclear facilities need to be dismantled when they are decommissioned, and different treatments are needed according to different radioactive contents, and decontamination and repair of soil and the like are needed, which can greatly reduce the places occupied by radioactive objects, reduce personnel maintenance and guard costs, and increase reusable land and the like. In the event of nuclear leakage pollution, it may cause large-area pollution to the surrounding environment, and radiation monitoring needs to be performed on the surrounding of the leakage point to determine the degree and area of pollution and prepare for decontamination and repair. The currently used radioactive pollution hotspot measurement system mainly includes Compton cameras, gamma cameras and the like, but due to the limitations of cost, size, detection efficiency and the like, there are still many deficiencies in large-scale pollution measurement, time effectiveness is poor, and labor cost is high. In the event of a nuclear leakage accident, if the large-area radioactive pollution can be measured quickly, it is of considerable significance for accident research and emergency response. SUMMARY

[0003] To solve the defects in the prior art, the purpose of the present application is to provide a large-area radioactive pollution distribution rapid measurement system and method based on optical fibers, which can realize monitoring and rapid positioning of X, gamma and beta pollution levels of pollutants in a large area.

[0004] To achieve the above purpose, a technical solution adopted by the present application is as follows:

[0005] A large-area radioactive pollution distribution rapid measurement system based on optical fibers, comprising an optical fiber detection subsystem and a pollution distribution positioning subsystem, wherein the optical fiber detection subsystem and the pollution distribution positioning subsystem are communicatively connected.

[0006] The optical fiber detection subsystem is used to determine the relative position information of radioactive pollution.

[0007] The pollution distribution positioning subsystem is used to determine the spatial position information of pollution hotspots, and finally determines and displays the distribution of radioactive pollution by fusing the relative position information and the spatial position information.

[0008] Further, the large-area radioactive contamination distribution rapid measurement system based on optical fiber as described above, the optical fiber detection subsystem includes a scintillation fiber, a photomultiplier tube, a signal processing and control circuit, the scintillation fiber is used for interacting with X, γ, β ray to generate optical signal; the photomultiplier tube is fixed at the end face of the scintillation fiber, for collecting the optical signal and converting it into electrical signal; the signal processing and control circuit is connected with the output end of the photomultiplier tube, for determining the relative position information of radioactive contamination according to the electrical signal using amplitude / time positioning algorithm.

[0009] Further, the large-area radioactive contamination distribution rapid measurement system based on optical fiber as described above, the contamination distribution positioning subsystem includes a satellite navigation positioning module, a ranging module and a contamination distribution imaging module, the output end of the satellite navigation positioning module and the ranging module are connected with the input end of the contamination distribution imaging module, the satellite navigation positioning module is used for determining the geographical position information of radioactive contamination, and the ranging module is used for determining the distance information between the optical fiber detection subsystem and radioactive contamination area.

[0010] Further, the large-area radioactive contamination distribution rapid measurement system based on optical fiber as described above, the output end of the signal processing and control circuit is connected with the input end of the contamination distribution imaging module, and the relative position information is transmitted to the contamination distribution imaging module.

[0011] Further, the large-area radioactive contamination distribution rapid measurement system based on optical fiber as described above, the contamination distribution imaging module fuses the relative position information, geographical position information and distance information of radioactive contamination, rapidly determines the distribution of radioactive contamination using distance residual-based dynamic fusion algorithm, and displays it.

[0012] Further, the large-area radioactive contamination distribution rapid measurement system based on optical fiber as described above, the length of the scintillation fiber is greater than or equal to 10 m.

[0013] Further, the large-area radioactive contamination distribution rapid measurement system based on optical fiber as described above, the scintillation fiber is a plastic scintillation fiber, a glass scintillation fiber or a crystal scintillation fiber.

[0014] The method for rapidly measuring the distribution of large-area radioactive contamination using the measurement system as described above, comprising the following steps:

[0015] S1, the optical fiber detection subsystem interacts with X, γ, β ray generated by radioactive contamination through scintillation fiber to generate weak optical signal; the optical signal is collected by photomultiplier tube and converted into electrical signal; the electrical signal is determined using amplitude / time positioning algorithm to determine the relative position information of radioactive contamination, and the relative position information is transmitted to the contamination distribution imaging module;

[0016] S2, while S1, the pollution distribution positioning subsystem determines the geographical position information of radioactive pollution through a satellite navigation positioning module, determines the distance between the optical fiber detection subsystem and the radioactive pollution area through a ranging module, and transmits the geographical position information and distance information to the pollution distribution imaging module;

[0017] S3, the pollution distribution imaging module determines the distribution of radioactive pollution according to the received relative position information, geographical position information and distance information of radioactive pollution, and finally determines the distribution of radioactive pollution using a dynamic fusion algorithm based on distance residual and displays it.

[0018] The system and method for quickly measuring the distribution of large-area radioactive pollution based on optical fibers provided by the present application have the following significant technical effects:

[0019] The present application uses scintillating optical fibers as radiation detectors, and the length of the scintillating optical fibers reaches 10m, which can efficiently and quickly measure large-area radioactive pollution and image the radiation dose rate distribution, greatly improving the search efficiency of pollution hotspots and reducing the radiation dose of workers, providing a new technical means for nuclear facility decommissioning and nuclear emergency monitoring. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A flowchart of a method for quickly measuring the distribution of large-area radioactive pollution based on optical fibers is provided in the embodiments of the present application.

[0021] Figure 2 A structural framework diagram of a system for quickly measuring the distribution of large-area radioactive pollution based on optical fibers is provided in the embodiments of the present application. DETAILED DESCRIPTION

[0022] The present application will be further described below in conjunction with specific embodiments and the accompanying drawings.

[0023] To solve the problems of high cost, large size of measuring equipment and poor timeliness in large-scale pollution measurement in the prior art, the present application provides a system and method for quickly measuring the distribution of large-area radioactive pollution based on optical fibers, which uses scintillating optical fibers as radiation detectors to determine the relative position of radioactive pollution, and combines the Beidou navigation positioning system and positioning algorithm to determine the geographical position of the pollution point, realizing the monitoring and rapid positioning of X, γ and β pollution levels of pollutants in a large area.

[0024] Figure 1A structural framework diagram of a large-area radioactive contamination distribution fast measurement system based on optical fiber is shown, which mainly comprises an optical fiber detection subsystem 100 and a contamination distribution positioning subsystem 200, and the optical fiber detection subsystem 100 and the contamination distribution positioning subsystem 200 are communicatively connected. The optical fiber detection subsystem 100 is used to determine the relative position of radioactive contamination, and the contamination distribution positioning subsystem 200 is used to determine the spatial position information of the contamination hot spot. The relative position information of radioactive contamination measured by the optical fiber detection subsystem 100 and the spatial position information measured by the contamination distribution positioning subsystem 200 are fused, and finally the distribution of radioactive contamination is determined. Wherein:

[0025] The optical fiber detection subsystem 100 comprises a scintillation optical fiber 110, a photomultiplier tube 120 and a signal processing and control circuit 130. The scintillation optical fiber 110 is used to interact with X, γ and β rays to generate light signal characteristics. The photomultiplier tube 120 is fixed on the end face of the scintillation optical fiber 110, and is used to collect the weak light signal generated by the scintillation optical fiber 110 and convert it into an electrical signal. The signal processing and control circuit 130 is connected with the output end of the photomultiplier tube 120, and is used to determine the relative position of radioactive contamination by using amplitude / time positioning algorithm according to the electrical signal.

[0026] The contamination distribution positioning subsystem 200 comprises a satellite navigation positioning module 210, a ranging module 220 and a contamination distribution imaging module 230. The output ends of the satellite navigation positioning module 210 and the ranging module 220 are connected with the input end of the contamination distribution imaging module 230. The satellite navigation positioning module 210 is used to determine the geographic position information of radioactive contamination, and the ranging module 220 is used to determine the distance between the optical fiber detection subsystem 100 and the radioactive contamination area.

[0027] The output end of the signal processing and control circuit 130 is also connected with the input end of the contamination distribution imaging module 230. The contamination distribution imaging module 230 fuses the relative position information of radioactive contamination measured by the optical fiber detection subsystem 100 and the spatial position information measured by the contamination distribution positioning subsystem 200, adopts a dynamic fusion algorithm based on distance residual to quickly determine the distribution of radioactive contamination, and displays it.

[0028] Here, it should be noted that the scintillation optical fiber 110 is a functional material with radiation sensing and optical signal transmission functions, which has the advantages of small detection unit granularity, long light attenuation length, short light emission decay time and strong plasticity. In the embodiment of the present application, the length of the scintillation optical fiber 110 reaches 10 m, which can efficiently and quickly measure large-area radioactive contamination. In some embodiments, the scintillation optical fiber can be selected from plastic scintillation optical fiber, glass scintillation optical fiber or crystal scintillation optical fiber, and the present application does not limit this.

[0029] The photomultiplier tube 120 is a kind of optical detection device for converting weak light signals into electrical signals.In some embodiments, the photomultiplier tube 120 can be selected from a silicon photomultiplier tube, a high-temperature photomultiplier tube, a low-temperature photomultiplier tube, a low-background radiation photomultiplier tube, etc., and the present application does not make any limitation thereon.

[0030] The satellite navigation positioning module 210 is a positioning system capable of providing accurate geographic position anywhere in the world and near space.In some embodiments, the satellite navigation positioning module 210 can be selected from the Beidou satellite navigation system (BDS), the GPS of the United States, the GLONASS of Russia or the GALILEO of the European Union, etc., and the present application does not make any limitation thereon.

[0031] The distance measuring module 220 can adopt a laser range finder, an ultrasonic range finder, an infrared range finder, etc., and the present application does not make any limitation thereon.

[0032] The pollution distribution imaging module 230 includes an industrial computer with a display screen, and a pollution distribution imaging software is placed therein.

[0033] Figure 2 A flow chart of a large-area radioactive pollution distribution fast measurement method based on an optical fiber provided in an embodiment of the present application is shown, and the method includes the following steps:

[0034] S1, the optical fiber detection subsystem interacts with X, γ and β rays generated by radioactive pollution through a scintillating optical fiber to generate weak light signals; the optical signals are collected by a photomultiplier tube and converted into electrical signals; an amplitude / time positioning algorithm is used to determine the relative position information of the radioactive pollution, and the relative position information is transmitted to the pollution distribution imaging module;

[0035] S2, at the same time as step S1, the pollution distribution positioning subsystem determines the geographic position information of the radioactive pollution through a satellite navigation positioning module, determines the distance between the optical fiber detection subsystem and the radioactive pollution area through a distance measuring module, and transmits the geographic position information and distance information to the pollution distribution imaging module;

[0036] S3, the pollution distribution imaging module determines the distribution of the radioactive pollution according to the received relative position information, geographic position information and distance information of the radioactive pollution, and finally determines the distribution of the radioactive pollution using a dynamic fusion algorithm based on distance residual and displays the result.

[0037] The application provides a large-area radioactive contamination distribution fast measurement system and method based on optical fibers, adopts a scintillation optical fiber as a radiation detector to determine the relative position of radioactive contamination, simultaneously combines a Beidou navigation positioning system and a positioning algorithm to determine the geographical position of the contamination point, realizes monitoring and fast positioning of X, gamma and beta contamination levels of the large-area radioactive contamination, provides radioactive contamination data for nuclear facility decommissioning, fast judgment and emergency response of nuclear accidents, and provides a new monitoring method for large-area radioactive contamination measurement.

[0038] The above examples are only illustrative of the application, and the application can be implemented in other specific ways or other specific forms without departing from the spirit or essential characteristics of the application. Therefore, the described embodiments should be considered illustrative rather than limiting in any aspect. The scope of the application should be illustrated by the appended claims, and any changes equivalent to the intent and scope of the claims should be included in the scope of the application.

Claims

1. A large-area radioactive contamination distribution fast measurement system based on optical fiber, characterized in that, The system comprises a fiber detection subsystem (100) and a pollution distribution positioning subsystem (200), which are communicatively connected. The fiber detection subsystem (100) is used for determining the relative position information of radioactive pollution, and comprises a scintillation fiber (110), a photomultiplier tube (120) and a signal processing and control circuit (130). The scintillation fiber (110) is used for interacting with X, γ and β rays to generate optical signals. The photomultiplier tube (120) is fixed on the end face of the scintillation fiber (110) and is used for collecting the optical signals and converting them into electrical signals. The signal processing and control circuit (130) is connected with the output end of the photomultiplier tube (120) and is used for determining the relative position information of radioactive pollution by using an amplitude / time positioning algorithm according to the electrical signals. The pollution distribution positioning subsystem (200) is used for determining the spatial position information of pollution hotspots and finally determining and displaying the distribution of radioactive pollution by fusing the relative position information and the spatial position information. The pollution distribution positioning subsystem (200) comprises a satellite navigation positioning module (210), a ranging module (220) and a pollution distribution imaging module (230). The output ends of the satellite navigation positioning module (210) and the ranging module (220) are connected with the input end of the pollution distribution imaging module (230). The satellite navigation positioning module (210) is used for determining the geographic position information of radioactive pollution. The ranging module (220) is used for determining the distance information between the fiber detection subsystem (100) and the radioactive pollution area. The pollution distribution imaging module (230) fuses the relative position information, the geographic position information and the distance information of radioactive pollution, quickly determines the distribution of radioactive pollution by using a dynamic fusion algorithm based on distance residual error, and displays the distribution.

2. The fiber-optic based fast measurement system of large-area radioactive contamination distribution according to claim 1, characterized in that, The output end of the signal processing and control circuit (130) is connected with the input end of the pollution distribution imaging module (230) and transmits the relative position information to the pollution distribution imaging module (230).

3. The optical fiber-based fast measurement system of large-area radioactive contamination distribution according to claim 1 or 2, characterized in that, The length of the scintillation fiber (110) is greater than or equal to 10 m.

4. The fiber-optic based fast measurement system of large-area radioactive contamination distribution according to claim 3, characterized in that, The scintillation fiber (110) is a plastic scintillation fiber, a glass scintillation fiber or a crystal scintillation fiber.

5. A method for quickly measuring the distribution of radioactive pollution in a large area by using the measurement system according to any one of claims 1-4, comprising the following steps: S1. The fiber detection subsystem interacts with X, γ and β rays generated by radioactive pollution through the scintillation fiber to generate weak optical signals. The optical signals are collected by the photomultiplier tube and converted into electrical signals. The amplitude / time positioning algorithm is used to determine the relative position information of radioactive pollution, and the relative position information is transmitted to the pollution distribution imaging module. S2, while S1, the pollution distribution positioning subsystem determines the geographical position information of radioactive pollution through a satellite navigation positioning module, determines the distance between the optical fiber detection subsystem and the radioactive pollution area through a ranging module, and transmits the geographical position information and distance information to the pollution distribution imaging module; S3, the pollution distribution imaging module determines the distribution of radioactive pollution according to the received relative position information, geographical position information and distance information of radioactive pollution, and displays the distribution of radioactive pollution by using a dynamic fusion algorithm based on distance residual error.

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