Airborne nuclear radiation detection system

Abstract

The utility model discloses an airborne nuclear radiation detection system which comprises an air detection device and a ground server. The air detection device comprises an unmanned aerial vehicle and an aviation radioactivity measurement mechanism; the aviation radioactivity measurement mechanism is mounted on the unmanned aerial vehicle; the aviation radioactivity measurement mechanism comprises a shell, a CeBr3 detector, a main controller and a data transmitter; the shell is fixedly connected with the unmanned aerial vehicle; the CeBr3 detector and the main controller are arranged in the shell; the CeBr3 detector comprises a CeBr3 crystal, a silicon photomultiplier, a pulse amplitude analyzer and a power supply; the CeBr3 crystal is arranged on the silicon photomultiplier tube; the silicon photomultiplier is electrically connected with the pulse amplitude analyzer; the pulse amplitude analyzer is electrically connected with the power supply and the main controller respectively; the data transmitters are electrically connected with the main controller, and the data transmitters are in signal communication with a ground server in a wireless transmission mode. The airborne nuclear radiation detection system has the advantages of good safety, all-terrain coverage, good flexibility and the like.

Description

Technical Field

[0001] The utility model relates to a nuclear radiation detection device, in particular to an airborne nuclear radiation detection system. Background Art

[0002] Nuclear radiation, also commonly referred to as radioactivity, is a type of energy emitted by radioactive substances in the form of waves or particles. Severe nuclear radiation can cause serious harm to the human body and is an important factor in causing cancer. However, with the development and utilization of nuclear technology, nuclear pollution and nuclear leakage also occur occasionally. For the detection of nuclear radiation, conventional measures mainly include manual handheld instrument measurement, vehicle-mounted spectrometer inspection, and fixed-site monitoring. These methods have certain shortcomings. For example, strong radiation leakage areas will cause radiation damage to personnel, vehicle-mounted equipment relies on measuring terrain and environment, and fixed-site monitoring cannot measure unknown radiation fields and has a slow measurement effect. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned problems and provide an airborne nuclear radiation detection system, which has the advantages of good safety, all-terrain coverage and good flexibility.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] An airborne nuclear radiation detection system includes an aerial detection device and a ground server;

[0006] The aerial detection device includes a drone and an aerial radioactivity measurement mechanism; the aerial radioactivity measurement mechanism is mounted on the drone;

[0007] The aerial radioactivity measurement mechanism includes a shell, a CeBr3 detector, a main controller and a data transmitter; the shell is fixedly connected to the UAV; the CeBr3 detector and the main controller are both arranged in the shell; the CeBr3 detector includes a CeBr3 crystal, a silicon photomultiplier tube, a pulse amplitude analyzer and a power supply; the CeBr3 crystal is arranged on the silicon photomultiplier tube; the silicon photomultiplier tube is electrically connected to the pulse amplitude analyzer; the pulse amplitude analyzer is electrically connected to the power supply and the main controller respectively; the data transmitters are all electrically connected to the main controller, and the data transmitters achieve signal communication with the ground server through wireless transmission.

[0008] The working principle of the above-mentioned airborne nuclear radiation detection system is as follows:

[0009] During operation, a drone equipped with an aerial radioactivity measurement device flies over the radiation area to be detected. During flight, radiation is detected using a CeBr3 detector. When the CeBr3 crystal absorbs gamma rays, the radiation energy propagates within the CeBr3 crystal in the form of light, then reaches the silicon photomultiplier tube 11 (SiPM). The SiPM 11 converts the light emitted by the CeBr3 crystal into a photoelectron signal and transmits it to a pulse amplitude analyzer. The pulse amplitude analyzer analyzes the output electrical signal to obtain the gamma-ray energy spectrum. The gamma-ray energy spectrum is then transmitted to a ground server via a data link. Upon receiving the detection data, the ground server can perform functions such as energy spectrum data storage, real-time energy spectrum data processing, automatic nuclide identification, automatic nuclide activity calculation, automatic source traceability, energy spectrum dose conversion calculation, dose mapping, and nuclide mapping.

[0010] In a preferred embodiment of the present invention, a plurality of CeBr3 detectors are provided and are evenly arranged along the circumferential direction.

[0011] In a preferred embodiment of the present invention, the CeBr3 crystals in a same CeBr3 detector are arranged in a 2x2 array.

[0012] In a preferred embodiment of the present invention, four groups of silicon photomultiplier tubes are provided in the same CeBr3 detector, and each group of silicon photomultiplier tubes is arranged in an 8x8 array.

[0013] In a preferred embodiment of the present invention, the CeBr3 detector further comprises a digital multi-channel transmission module, which is electrically connected between the silicon photomultiplier tube and the pulse amplitude analyzer.

[0014] In a preferred embodiment of the present invention, the aerial radioactivity measurement mechanism further comprises a PoE multi-channel transmission module, which is electrically connected between the main controller and the CeBr3 detector.

[0015] In a preferred embodiment of the present invention, the aerial radioactivity measurement mechanism further comprises a dosimeter for collecting gamma dose rate signals, and the dosimeter is electrically connected to the main controller.

[0016] In a preferred embodiment of the present invention, the housing comprises a main shell and a shell cover, and the shell cover is made of a transparent material.

[0017] Furthermore, a mounting seat is provided in the main shell; the main controller is arranged on the mounting seat; the CeBr3 detector is electrically connected to the main controller through a PoE multi-channel transmission module; the PoE multi-channel transmission module is arranged on the mounting seat.

[0018] Furthermore, a partition cylinder is provided in the main shell, and a first receiving hole for receiving a CeBr3 detector and a second receiving hole for receiving a dosimeter are provided in the partition cylinder.

[0019] Furthermore, the first receiving holes are provided in plurality and are evenly arranged along the circumferential direction; the second receiving holes are arranged between the plurality of first receiving holes.

[0020] In a preferred solution of the present invention, the data transmitter is arranged on the outer side of the housing.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The airborne nuclear radiation detection system of the utility model can place the aerial radioactivity measurement mechanism above the radiation area to be detected by mounting the aerial radioactivity measurement mechanism on a drone, without the need for staff to perform the detection work, has good safety, can cover all terrains, and has good flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a front view of the aviation radioactivity measurement mechanism of the airborne nuclear radiation detection system of the present invention.

[0024] Figure 2 The utility model is a schematic diagram of the explosion of the three-dimensional structure of the aviation radioactivity measurement mechanism of the airborne nuclear radiation detection system.

[0025] Figure 3 This is a schematic diagram of the internal three-dimensional structure explosion of the CeBr3 detector of the present invention. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with embodiments and drawings, but the implementation methods of the present invention are not limited thereto.

[0027] The airborne nuclear radiation detection system of this embodiment includes an aerial detection device and a ground server; the aerial detection device includes a drone and an aerial radioactivity measurement mechanism; the aerial radioactivity measurement mechanism is mounted on the drone; and the ground server is composed of a working computer.

[0028] See also Figure 1-2 The aerial radioactivity measurement mechanism includes a shell, a locator, a CeBr3 detector 1, a dosimeter 2, a PoE multi-channel transmission module 3, a main controller 4 and a data transmitter 5; the shell is fixedly connected to the drone; the shell includes a main shell 6 and a shell cover 7, and the shell cover 7 is made of transparent material.

[0029] See also Figure 1-2The main shell 6 is provided with a mounting seat 8 and a partition cylinder 9; the main controller 4 is arranged on the mounting seat 8; the CeBr3 detector 1 is electrically connected to the main controller 4 through the PoE multi-channel transmission module 3; the PoE multi-channel transmission module 3 is arranged on the mounting seat 8.

[0030] See also Figure 1-2 The partition cylinder 9 is provided with a first receiving hole 9 - 1 for receiving the CeBr 3 detector 1 and a second receiving hole 9 - 2 for receiving the dosimeter 2 .

[0031] Furthermore, the first receiving holes 9 - 1 are provided in plurality and are evenly arranged along the circumferential direction; the second receiving holes 9 - 2 are arranged between the plurality of first receiving holes 9 - 1 .

[0032] See also Figure 2-3 The CeBr3 detector 1, the dose meter 2, the PoE multi-channel transmission module 3, and the main controller 4 are all arranged in the housing; the CeBr3 detector 1 includes a CeBr3 crystal 10, a digital multi-channel transmission module, a silicon photomultiplier tube 11, a pulse amplitude analyzer 12, and a power supply 13; the CeBr3 crystal 10 is arranged on the silicon photomultiplier tube 11; see Figure 3 The silicon photomultiplier tube 11 is electrically connected to the pulse amplitude analyzer 12; the pulse amplitude analyzer 12 is electrically connected to the power supply 13 and the main controller 4 respectively; the digital multi-channel transmission module is electrically connected between the silicon photomultiplier tube 11 and the pulse amplitude analyzer 12.

[0033] Among them, CeBr3 (cerium bromide) crystals have excellent scintillation properties, with energy resolution and decay time comparable to those of lanthanum bromide (LaBr3:ce) crystals, while also possessing superior time resolution characteristics. Furthermore, the constituent elements of CeBr3 crystals 10 contain no naturally occurring radioactive isotopes and therefore do not contribute to background radiation. Within the energy range of 1500-2200 keV, the standard background is generally 0.025 c / s / cc, and low background can be less than 0.001 c / s / cc.

[0034] See also Figure 2 The CeBr3 detectors 1 are provided in multiple numbers and are evenly arranged along the circumferential direction. Specifically, in this embodiment, there are four CeBr3 detectors 1, but other numbers are also possible.

[0035] See also Figure 3 The CeBr3 crystals 10 in the same CeBr3 detector 1 are arranged in a 2x2 array.

[0036] See also Figure 3 , four groups of silicon photomultiplier tubes 11 are arranged in the same CeBr3 detector 1, and each group of silicon photomultiplier tubes 11 is arranged in an 8x8 array.

[0037] The silicon photomultiplier tube (SiPM) array is coupled to the light-guiding glass of the CeBr3 crystal package through an optical pad. The SiPM array uses a TSV packaging structure. Each small unit measures 6.07 mm × 6.07 mm, with a pixel size of 35 μm and a fill factor of 76%. Each small unit contains 22,292 pixels, and the number of pixels per unit area is 605 / mm. 2 , the number of photons collected per unit area is 27 photon mm2 compared to 100% of the photons collected per unit area for 2 MeV excitation. −2 An order of magnitude higher, so there is no saturation, and a single device can achieve a 300-fold dynamic range. Its quantum efficiency is 30%–40% at a wavelength of 380 nm, which is higher than the 20%–30% of traditional PMTs.

[0038] The temperature coefficient of SiPM is 21.5 mV °C −1 The SiPM temperature is collected by a temperature sensor, converted into a digital signal and fed back to the power supply circuit to adjust the SiPM bias voltage, achieving real-time gain temperature correction and maintaining the stability of the SiPM gain.

[0039] See also Figure 2 The dosimeter 2 and the data transmitter 5 are both electrically connected to the main controller 4; the dosimeter 2 is a dosimeter 2 used to collect γ dose rate signals; the poe multi-channel transmission module 3 is electrically connected between the main controller 4 and the CeBr3 detector 1; the data transmitter 5 is connected to the ground server 14 through wireless transmission, and the data transmitter 5 is arranged on the outer side of the shell.

[0040] Specifically, the main controller 4 has GPS / BD, neutron, Geiger, serial port, storage and solid-state relay IO, clock synchronization, and can realize the control and data acquisition of functions such as neutron counting, Geiger counting, and aerosol sampling. It is mainly responsible for multi-channel energy spectrum data acquisition, Beidou information acquisition, data packaging and packaging, airborne storage, data transmission and reception, and other functions.

[0041] See also Figure 1-3 The working principle of the airborne nuclear radiation detection system of this embodiment is as follows:

[0042] During operation, a drone equipped with an aerial radioactivity measurement device flies over the radiation area to be detected. During flight, radiation is detected using a CeBr3 detector 1. When a CeBr3 crystal 10 absorbs gamma rays, the radiation energy propagates within the CeBr3 crystal 10 in the form of light, and then propagates to a silicon photomultiplier tube 11 (SiPM). The SiPM 11 converts the light emitted by the CeBr3 crystal 10 into a photoelectron signal and transmits it to a pulse amplitude analyzer 12. The pulse amplitude analyzer 12 analyzes the output electrical signal to obtain the gamma ray energy spectrum. The gamma ray energy spectrum is then sent to a ground server 14 via a data transmitter 5. Simultaneously, a dosimeter 2 collects the gamma dose rate and sends it to the bottom server 14.

[0043] After the ground server 14 receives the detection data, it can realize functions such as energy spectrum data storage, real-time processing of energy spectrum data, automatic nuclide identification, automatic nuclide activity calculation, automatic traceability, energy spectrum dose conversion calculation, dose mapping, and nuclide mapping.

[0044] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. An airborne nuclear radiation detection system, characterized in that: including an aerial detection device and a ground server (14); The aerial detection device includes a drone and an aerial radioactivity measurement mechanism; the aerial radioactivity measurement mechanism is mounted on the drone; The aerial radioactivity measurement mechanism comprises a housing, a CeBr3 detector (1), a main controller (4) and a data transmitter (5); the housing is fixedly connected to the unmanned aerial vehicle; the CeBr3 detector (1) and the main controller (4) are both arranged in the housing; the CeBr3 detector (1) comprises a CeBr3 crystal (10), a silicon photomultiplier tube (11), a pulse amplitude analyzer (12) and a power supply (13); the CeBr3 crystal (10) is arranged on the silicon photomultiplier tube (11); the silicon photomultiplier tube (11) is electrically connected to the pulse amplitude analyzer (12); the pulse amplitude analyzer (12) is electrically connected to the power supply (13) and the main controller (4) respectively; the data transmitter (5) is electrically connected to the main controller (4), and the data transmitter (5) realizes signal communication with the ground server (14) through wireless transmission.

2. The airborne nuclear radiation detection system according to claim 1, characterized in that: The CeBr3 detectors (1) are provided in plurality and are evenly arranged along the circumferential direction.

3. The airborne nuclear radiation detection system according to claim 1, characterized in that: The CeBr3 crystals (10) within the same CeBr3 detector (1) are arranged in a 2x2 array.

4. The airborne nuclear radiation detection system according to claim 3, characterized in that: Four groups of silicon photomultiplier tubes (11) are arranged in the same CeBr3 detector (1), and each group of silicon photomultiplier tubes (11) is arranged in an 8x8 array.

5. The airborne nuclear radiation detection system according to claim 1, characterized in that: The CeBr3 detector (1) further comprises a digital multi-channel transmission module, which is electrically connected between the silicon photomultiplier tube (11) and the pulse amplitude analyzer (12).

6. The airborne nuclear radiation detection system according to claim 1, characterized in that: The aerial radioactivity measurement mechanism further comprises a PoE multi-channel transmission module (3), which is electrically connected between the main controller (4) and the CeBr3 detector (1).

7. The airborne nuclear radiation detection system according to claim 1, characterized in that: The aerial radioactivity measurement mechanism further comprises a dosimeter (2) for collecting gamma dose rate signals, and the dosimeter (2) is electrically connected to the main controller (4).

8. The airborne nuclear radiation detection system according to any one of claims 1 to 7, characterized in that: The housing comprises a main shell (6) and a housing cover (7), and the housing cover (7) is made of a transparent material.

9. The airborne nuclear radiation detection system according to claim 8, characterized in that: A mounting seat (8) is provided in the main housing (6); the main controller (4) is arranged on the mounting seat (8); the CeBr3 detector (1) is electrically connected to the main controller (4) via a PoE multi-channel transmission module (3); and the PoE multi-channel transmission module (3) is arranged on the mounting seat (8).

10. The airborne nuclear radiation detection system according to claim 8, characterized in that: A partition cylinder is provided in the main shell, and a first receiving hole (9-1) for receiving a CeBr3 detector (1) and a second receiving hole (9-2) for receiving a dose meter are provided in the partition cylinder; A plurality of the first receiving holes (9-1) are provided and are evenly arranged along the circumferential direction; and the second receiving holes (9-2) are arranged between the plurality of first receiving holes (9-1).

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