A radioactive noble gas detection device

Abstract

The application discloses a radioactive inert gas detection device, which comprises a gas chamber, a plastic scintillator detection assembly for detecting the total beta activity concentration of radioactive inert gas, and a lanthanum bromide crystal detection assembly for detecting the activity concentration of each radionuclide category in the radioactive inert gas. The plastic scintillator detection assembly comprises first, second and third plastic scintillator detectors and a first signal processing circuit board, and the bottom of the third plastic scintillator detector is provided with a lead shielding plate. The lanthanum bromide crystal detection assembly comprises first and second lanthanum bromide crystal detectors and a second signal processing circuit board, and the first lanthanum bromide crystal detector is provided with a lead shielding plate on the top thereof. The device can overcome environmental background interference, improve detection efficiency, and accurately measure the total beta activity concentration of radioactive inert gas in the exhaust pipeline and the activity concentration of each radionuclide category under the condition that the activity concentration of the radioactive inert gas is low.

Description

Technical Field

[0001] This invention relates to the field of nuclear radiation monitoring technology, and in particular to a radioactive inert gas detection device. Background Technology

[0002] During operation, nuclear power plants produce radioactive gases due to the fission of U-235 and the decay of fission fragments. Among these, radioactive inert gases account for a high proportion. These radioactive inert gases generally contain radionuclides such as Kr-85, Xe-133, Ke-88, and Xe-135. These radioactive inert gases containing multiple radionuclides are carried into the secondary loop along with the steam generator.

[0003] In existing technologies, monitoring equipment for measuring radioactive inert gases needs to be installed in the exhaust duct of the secondary loop. However, the activity concentration of radioactive inert gases in the exhaust duct is low. In nuclear power plants with high ambient gamma dose rates or large fluctuations in ambient doses, where there is significant background interference, traditional sodium iodide inert gas detectors have low detection efficiency and cannot accurately measure the activity concentration of inert gases at low concentrations, nor can they accurately distinguish various radionuclides in the gas. Summary of the Invention

[0004] Therefore, it is necessary to provide a radioactive inert gas detection device that can overcome background interference, improve detection efficiency, and accurately measure the total β activity concentration of radioactive inert gas in the exhaust pipe, as well as the type and activity concentration of each radionuclide, even when the activity concentration of radioactive inert gas is low.

[0005] This invention provides a radioactive inert gas detection device, comprising:

[0006] The gas chamber is connected to the exhaust pipe containing the radioactive inert gas;

[0007] The plastic scintillator, located at the top of the gas chamber, is used to detect the total β activity concentration of radioactive inert gas.

[0008] The lanthanum bromide crystal detection component is located at the bottom of the gas chamber and is used to detect the types of radionuclides and the activity concentration of each radionuclide in the radioactive inert gas.

[0009] The plastic scintillator detection assembly includes a first plastic scintillator, a second plastic scintillator, a third plastic scintillator, and a first signal processing circuit board. A first lead shielding plate is provided at the bottom of the third plastic scintillator.

[0010] The first signal processing circuit board is used to calculate the first total β activity concentration of the radioactive inert gas after deducting the environmental background based on the received signals from the first and second plastic scintillator detectors using a threshold discrimination method, calculate the second total β activity concentration of the radioactive inert gas after deducting the environmental background based on the received signals from the second and third plastic scintillator detectors using a current integration method, and determine the final total β activity concentration of the radioactive inert gas based on the first and second total β activity concentrations.

[0011] In one embodiment, the lanthanum bromide crystal detection assembly includes a first lanthanum bromide crystal detector, a second lanthanum bromide crystal detector, and a second signal processing circuit board.

[0012] A second lead shielding plate is provided between the first lanthanum bromide crystal detector and the second lanthanum bromide crystal detector, and a third lead shielding plate is provided on the top of the second lanthanum bromide crystal detector. The second shielding lead plate and the third shielding lead plate are perpendicular to each other and fixedly connected.

[0013] The second signal processing circuit board is used to calculate and output the categories of each radionuclide and the activity concentration of each radionuclide after deducting the environmental background, based on the signals from the first lanthanum bromide crystal detector and the second lanthanum bromide crystal detector.

[0014] In one embodiment, the first plastic scintillator and the second plastic scintillator have different ranges and partially overlap.

[0015] In one embodiment, the radioactive inert gas detection device is further provided with a first fixed frame, a second fixed frame, a support base and a top cover. The first fixed frame and the second fixed frame are respectively fixedly connected to the upper and lower sides of the gas chamber, the support base is fixedly connected to the bottom of the second fixed frame, and the top cover is fixedly connected to the top of the first fixed frame.

[0016] Both the top cover and the support base are open box-type structures, and the openings of the top cover and the support base face the gas chamber.

[0017] In one embodiment, the gas chamber is provided with a cylindrical main body, a first carbon fiber plate and a second carbon fiber plate, which are horizontally fixedly assembled to the top and bottom of the main body, respectively.

[0018] In one embodiment, the first mounting frame has an internal mounting cavity, and the plastic scintillator detection assembly is also provided with a cover plate. The cover plate is fixedly connected to the top of the first mounting frame. The scintillator portions of the first plastic scintillator, the second plastic scintillator, and the third plastic scintillator are respectively disposed in the mounting cavity inside the first mounting frame. The cover plate is provided with three first mounting holes, and the housing portions of the first plastic scintillator, the second plastic scintillator, and the third plastic scintillator are respectively inserted into one of the first mounting holes.

[0019] The first signal processing circuit board is fixedly connected to the top of the cover plate.

[0020] In one embodiment, the lanthanum bromide crystal detection assembly is further provided with a mounting plate, which is vertically and fixedly connected to the inner wall of the support base, and the second signal processing circuit board is fixedly connected to the bottom of the mounting plate.

[0021] The mounting plate has two second mounting holes, and the first lanthanum bromide crystal detector and the second lanthanum bromide crystal detector are respectively fixedly mounted in one of the second mounting holes.

[0022] In one embodiment, the radioactive inert gas detection device is further provided with an inlet pipe and an outlet pipe, one end of which is connected to the gas chamber, and the other end of which is connected to the exhaust pipe where the radioactive inert gas is located.

[0023] In one embodiment, the radioactive inert gas detection device is further provided with a first source detection bracket, a second source detection bracket and a third source detection bracket, the main wall of the gas chamber is provided with a first source support hole through it, and a second source support hole and a third source support hole are provided axially through one side wall of the base.

[0024] The first source inspection bracket, the second source inspection bracket, and the third source inspection bracket are respectively inserted into the first source bracket hole, the second source bracket hole, and the third source bracket hole;

[0025] The slot of the first source detector is located inside the gas chamber, while the slots of the second and third source detectors are located inside the base, above the first and second lanthanum bromide crystal detectors.

[0026] In one embodiment, the thickness of the first lead shielding plate is 0.8 mm to 1.2 mm, and the thickness of the second and third lead shielding plates is 9 mm to 11 mm.

[0027] The beneficial effects of this invention are:

[0028] (1) The bottom of the third plastic scintillator of the present invention is provided with a first lead shielding plate, the second lead shielding plate is provided between the first lanthanum bromide crystal detector and the second lanthanum bromide crystal detector, and the top of the second lanthanum bromide crystal detector is provided with a third lead shielding plate. The lead shielding plate can shield the radiation of radioactive inert gas. The third plastic scintillator and the second lanthanum bromide crystal detector can realize the measurement of the environmental background. When calculating the total β activity concentration, the first signal processing circuit board can remove the environmental background interference based on the measurement results of the first plastic scintillator and the second plastic scintillator. The second signal processing circuit board can remove the environmental background interference based on the measurement results of the first lanthanum bromide crystal detector, thereby improving the detection efficiency.

[0029] (2) The radioactive inert gas detection device of the present invention has a plastic scintillator detection component and a lanthanum bromide crystal detection component respectively installed at the top and bottom of the gas chamber, and removes the background during signal processing, and can simultaneously and accurately measure the total β activity concentration of the radioactive inert gas in the exhaust pipe as well as the type and activity concentration of each radionuclide.

[0030] (3) In this invention, the ranges of the first plastic scintillator and the second plastic scintillator are different and partially overlap, which increases the range of the entire plastic scintillator assembly. Furthermore, the signal processing methods of the first plastic scintillator and the second plastic scintillator are different, and the detection results in the overlapping range can be mutually verified, making it more accurate. Attached Figure Description

[0031] Figure 1 A schematic diagram of the structure of the radioactive inert gas detection device provided in an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of the radioactive inert gas detection device provided in an embodiment of the present invention from another angle.

[0033] Figure 3 A schematic diagram of the structure of the radioactive inert gas detection device provided in an embodiment of the present invention, with the top cover and support base removed;

[0034] Figure 4 This is a schematic diagram showing the assembly relationship between the plastic scintillator detection component and the gas chamber;

[0035] Figure 5 for Figure 4 A schematic diagram of the cross-sectional structure along plane AA.

[0036] Explanation of reference numerals in the attached drawings: 100, Gas chamber; 110, Main body; 120, First carbon fiber plate; 130, Second carbon fiber plate; 140, Inlet pipe; 150, Outlet pipe; 210, First plastic scintillator; 220, Second plastic scintillator; 230, Third plastic scintillator; 240, First signal processing circuit board; 250, First lead shielding plate; 260, Cover plate; 310, First lanthanum bromide crystal detector; 320, Second lanthanum bromide crystal detector; 330, Second signal processing circuit board; 340, Second lead shielding plate; 350, Third shielding lead plate; 360, Mounting plate; 410, First fixing bracket; 420, Second fixing bracket; 500, Support base; 600, Top cover; 700, First source detection bracket; 710, Second source detection bracket; 720, Third source detection bracket; 800, Mounting lug; 900, Wooden pad. Detailed Implementation

[0037] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0038] It should be noted that in the description of this invention, "upper," "lower," "top," "bottom," and orientation or positional relationship are based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0039] In one embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, the radioactive inert gas detection device of this embodiment includes:

[0040] The gas chamber 100 is connected to the exhaust pipe containing the radioactive inert gas; the plastic scintillator is located at the top of the gas chamber 100 and is used to detect the total β activity concentration of the radioactive inert gas; the lanthanum bromide crystal detector is located at the bottom of the gas chamber 100 and is used to detect the types of radionuclides and the activity concentration of each radionuclide in the radioactive inert gas.

[0041] In this embodiment, the radioactive inert gas detection device has a plastic scintillator detection component and a lanthanum bromide crystal detection component installed at the top and bottom of the gas chamber 100, respectively, which can simultaneously measure the total β activity concentration of the radioactive inert gas in the exhaust pipe as well as the type and activity concentration of each radionuclide.

[0042] Among them, such as Figure 4 and Figure 5 As shown, the plastic scintillator detection assembly includes a first plastic scintillator 210, a second plastic scintillator 220, a third plastic scintillator 230, and a first signal processing circuit board 240. A first lead shielding plate 250 is provided at the bottom of the third plastic scintillator 230.

[0043] In this embodiment, the thickness of the first lead shielding plate 250 is 0.8mm to 1.2mm. The first lead shielding plate 250 can effectively shield the radiation of the radioactive inert gas in the gas chamber 100 to the third plastic scintillator 230, so the third plastic scintillator 230 can only measure the background interference.

[0044] In this embodiment, the first signal processing circuit board 240 is used to calculate the first total β activity concentration of the radioactive inert gas after deducting the environmental background based on the received signals from the first plastic scintillator 210 and the second plastic scintillator 220 using a threshold discrimination method, calculate the second total β activity concentration of the radioactive inert gas after deducting the environmental background based on the received signals from the second plastic scintillator 220 and the third plastic scintillator 230 using a current integration method, and determine the final total β activity concentration of the radioactive inert gas based on the first total β activity concentration and the second total β activity concentration.

[0045] It should be noted that since the plastic scintillator can measure both beta radiation and gamma radiation, that is, the plastic scintillator component in this embodiment can measure both types of radiation, the first signal circuit board 240 in this embodiment needs to remove gamma interference when processing the received signal.

[0046] Specifically, the threshold discrimination method includes four steps: threshold discrimination, pulse counting, background compensation, and activity calculation. The current integration method includes three steps: current integration, background compensation, and activity metering. It should be noted that the specific implementation processes of each step are well known to those skilled in the art and will not be elaborated upon here.

[0047] In this embodiment, the ranges of the first plastic scintillator 210 and the second plastic scintillator 220 are different and partially overlap. Therefore, the combined range of the first plastic scintillator 210 and the third plastic scintillator 230 after environmental background subtraction using the threshold discrimination method and the combined range of the second plastic scintillator 220 and the third plastic scintillator 230 after environmental background subtraction using the current integration method are also different and partially overlap.

[0048] For example, the first plastic scintillator 210 and the third plastic scintillator 230 together complete the measurement of the first total β activity concentration in radioactive inert gas within the range of 3.7E+03 Bq / m3 to 3.7E+09 Bq / m3, and the second plastic scintillator 220 and the third plastic scintillator 230 together complete the measurement of the second total β activity concentration within the range of 3.7E+07 Bq / m3 to 3.7E+12 Bq / m3.

[0049] In this embodiment, when the first signal processing circuit board 240 performs signal processing, if the first total β activity concentration and the second total β activity concentration measured by the two methods are the same, then the same value is taken as the final total β activity concentration. If, due to the first plastic scintillator 210 or the third plastic scintillator 230 exceeding its measurement range, only the first total β activity concentration or the second total β activity concentration can be measured, then the measured activity concentration is taken as the final total β activity concentration. Measuring the total β activity concentration using plastic scintillator detectors with different ranges based on different methods allows for mutual verification and also increases the range of the plastic scintillator detection components.

[0050] In one embodiment, the lanthanum bromide crystal detection assembly includes a first lanthanum bromide crystal detector 310, a second lanthanum bromide crystal detector 320, and a second signal processing circuit board 330.

[0051] A second lead shielding plate 340 is disposed between the first lanthanum bromide crystal detector 310 and the second lanthanum bromide crystal detector 320. A third lead shielding plate is disposed on the top of the second lanthanum bromide crystal detector 320. The second and third lead shielding plates 350 are perpendicular to each other and fixedly connected. The thickness of both the second and third lead shielding plates 350 is 9mm to 11mm.

[0052] Lanthanum bromide crystals have a light yield of 63,000 photons / MeVγ. Using lanthanum bromide crystals can increase the light yield of scintillating materials, thus improving the detection efficiency of crystal detectors. The luminescence decay time refers to the process by which the luminescence intensity gradually decreases over time after excitation ceases. Lanthanum bromide has a luminescence decay time of 16.4 ns; a shorter decay time means that lanthanum bromide crystal detectors have higher energy resolution at high count rates.

[0053] The second and third shielding lead plates 350 can shield the radiation of radioactive inert gas to the second lanthanum bromide crystal detector 320. Therefore, the radiation of the second lanthanum bromide crystal detector 320 can only measure the background interference. When processing the signals of the first lanthanum bromide crystal detector 310 and the second lanthanum bromide crystal detector 320, the second signal processing circuit board 330 can remove the background interference based on the measurement results of the first lanthanum bromide crystal detector 310.

[0054] The second signal processing circuit board 330 is used to calculate and output the category of each radionuclide and the activity concentration of each radionuclide after deducting the environmental background, based on the signals from the first lanthanum bromide crystal detector 310 and the second lanthanum bromide crystal detector 320.

[0055] Specifically, when processing the signals from the first lanthanum bromide crystal detector 310 and the second lanthanum bromide crystal detector 320, the second signal processing circuit board 330 first performs signal shaping and pulse amplitude resolution on the signals from the first lanthanum bromide crystal detector 310 and the second lanthanum bromide crystal detector 320 respectively, then performs energy spectrum compensation on the data after the two pulse amplitude resolution, and finally performs activity calculation.

[0056] In this embodiment, the environmental background is eliminated when calculating the total β activity concentration of the radioactive inert gas and the category and activity concentration of each radionuclide. This avoids the influence of the environmental background on the measurement results and improves the efficiency and accuracy of low-concentration radioactive inert gas nuclear radiation detection.

[0057] In one embodiment, the radioactive inert gas detection device is further provided with a first fixing frame 410, a second fixing frame 420, a support base 500 and a top cover 600. The first fixing frame 410 and the second fixing frame 420 are respectively fixedly connected to the upper and lower sides of the gas chamber 100, the support base 500 is fixedly connected to the bottom of the second fixing frame 420, and the top cover 600 is fixedly connected to the top of the first fixing frame 410.

[0058] Specifically, both the top cover 600 and the support base 500 are open-top box-type structures, with their openings facing the gas chamber 100. The internal space of the top cover 600 and the support base 500 can provide assembly space for the plastic scintillator and the lanthanum bromide crystal detector. The bottom of the support base 500 can be equipped with four legs or casters.

[0059] In addition, lugs 800 and pads 900 can be installed on the first fixing frame 410 and the second fixing frame 420 in this embodiment to assist in the fixed installation of the entire radioactive inert gas detection device.

[0060] In one embodiment, the gas chamber 100 is provided with a cylindrical main body 110, a first carbon fiber plate 120 and a second carbon fiber plate 130, which are respectively horizontally fixedly assembled to the top and bottom of the main body 110.

[0061] It should be noted that since carbon material cannot shield or absorb nuclear radiation, the first carbon fiber plate 120 and the second carbon fiber plate 130 set above and below the gas chamber 100, under the premise of forming a seal in the gas chamber 100, facilitate the transfer of nuclear radiation from the radioactive inert gas in the gas chamber 100 to the plastic scintillator and the lanthanum bromide crystal detector.

[0062] In one embodiment, the first mounting frame 410 has an internal mounting cavity, and the plastic scintillator detection assembly is further provided with a cover plate 260. The cover plate 260 is fixedly connected to the top of the first mounting frame 410. The scintillator portions of the first plastic scintillator 210, the second plastic scintillator 220, and the third plastic scintillator 230 are respectively disposed in the mounting cavity inside the first mounting frame 410. The cover plate 260 is provided with three first mounting holes, and the housing portions of the first plastic scintillator 210, the second plastic scintillator 220, and the third plastic scintillator 230 are respectively inserted into one of the first mounting holes. The first signal processing circuit board 240 is fixedly connected to the top of the cover plate 260.

[0063] Specifically, the mounting cavity can be divided into three parts, each used to assemble the scintillator portion of a different plastic scintillator. The cover plate 260 and the base are used to fix the three plastic scintillators and the first signal processing circuit board 240.

[0064] It should be noted that, under the premise that the scintillator material is the same, the range of the scintillator will be different if the structural size of the scintillator is different. In this embodiment, it is preferred that the structural size of the first plastic scintillator 210 and the second plastic scintillator 220 is the same, and the size of the third plastic scintillator 230 is smaller than the size of the first plastic scintillator 210 or the second plastic scintillator 220.

[0065] In one embodiment, the lanthanum bromide crystal detection assembly is further provided with a mounting plate 360, which is vertically fixedly connected to the inner wall of the support base 500, and the second signal processing circuit board 330 is fixedly connected to the bottom of the mounting plate 360; the mounting plate 360 ​​is provided with two second mounting holes, and the first lanthanum bromide crystal detector 310 and the second lanthanum bromide crystal detector 320 are respectively fixedly mounted in one of the second mounting holes.

[0066] The mounting plate 360 ​​serves to fix the lanthanum bromide crystal detector inside the support base 500, i.e., the bottom of the gas chamber 100, and to provide assembly space for the second signal processing circuit board 330.

[0067] In this embodiment, the cover plate 260 and the mounting plate 360 ​​are made of stainless steel, which can prevent radiation from damaging the sensitive components on the first signal processing circuit board 240 and the second signal processing circuit board 330. The top cover 600, the support base 500, the main body 110 of the gas chamber 100, the first bracket and the second bracket are all made of stainless steel, which can isolate the radiation of the radioactive inert gas in the gas chamber 100.

[0068] In one embodiment, the radioactive inert gas detection device is further provided with an inlet pipe 140 and an outlet pipe 150. One end of the inlet pipe 140 and the outlet pipe 150 are connected to the gas chamber 100, and the other end of the inlet pipe 140 and the outlet pipe 150 are connected to the exhaust pipe where the radioactive inert gas is located.

[0069] In one embodiment, the radioactive inert gas detection device is further provided with a first source detector bracket 700, a second source detector bracket 710, and a third source detector bracket 720. The main body 110 of the gas chamber 100 has a first source bracket hole through it, and a second source bracket hole and a third source bracket hole are axially through it on one side wall of the base. The first source detector bracket 700, the second source detector bracket 710, and the third source detector bracket 720 are respectively inserted into the first source bracket hole, the second source bracket hole, and the third source bracket hole. The slot of the first source detector bracket 700 is located inside the gas chamber 100, and the slots of the second source detector bracket 710 and the third source detector bracket 720 are located above the first lanthanum bromide crystal detector 310 and the second lanthanum bromide crystal detector 320 inside the base.

[0070] In this embodiment, the first source detection bracket 700 can be used to place other sources to be detected, and the second source detection bracket 710 and the third source detection bracket 720 can be used to place other sources to be detected, or they can be used to place an attenuation layer to prevent the detector from saturating due to high activity concentration.

[0071] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A radioactive noble gas detection device, characterized by, The application relates to a radioactive inert gas detection device. The device comprises a gas chamber (100) in communication with an exhaust pipeline containing radioactive inert gas; a plastic scintillation detection assembly arranged at the top of the gas chamber (100) for detecting the total beta activity concentration of the radioactive inert gas; and a lanthanum bromide crystal detection assembly arranged at the bottom of the gas chamber (100) for detecting the activity concentration of each radionuclide category and each radionuclide in the radioactive inert gas. The plastic scintillation detection assembly comprises a first plastic scintillation detector (210), a second plastic scintillation detector (220), a third plastic scintillation detector (230) and a first signal processing circuit board (240), and the bottom of the third plastic scintillation detector (230) is provided with a first lead shielding plate (250). The first signal processing circuit board (240) is used for calculating the first total beta activity concentration of the radioactive inert gas after deducting the environmental background by using a threshold discrimination method according to the signals received by the first plastic scintillation detector (210) and the second plastic scintillation detector (220), calculating the second total beta activity concentration of the radioactive inert gas after deducting the environmental background by using a current integration method according to the signals received by the second plastic scintillation detector (220) and the third plastic scintillation detector (230), and determining the final total beta activity concentration of the radioactive inert gas based on the first total beta activity concentration and the second total beta activity concentration. The lanthanum bromide crystal detection assembly comprises a first lanthanum bromide crystal detector (310), a second lanthanum bromide crystal detector (320) and a second signal processing circuit board (330). The first lanthanum bromide crystal detector (310) and the second lanthanum bromide crystal detector (320) are provided with a second lead shielding plate (340), the top of the second lanthanum bromide crystal detector (320) is provided with a third lead shielding plate (350), and the second lead shielding plate (340) and the third lead shielding plate (350) are vertically and fixedly connected.

2. The radioactive noble gas detection apparatus according to claim 1, characterized by The second signal processing circuit board (330) is used for calculating the activity concentration of each radionuclide category and each radionuclide after deducting the environmental background according to the signals of the first lanthanum bromide crystal detector (310) and the second lanthanum bromide crystal detector (320). The range of the first plastic scintillation detector (210) and the second plastic scintillation detector (220) is different and partially overlaps. The radioactive inert gas detection device is further provided with a first fixing frame (410), a second fixing frame (420), a support seat (500) and a top cover (600), the first fixing frame (410) and the second fixing frame (420) are fixedly connected to the upper and lower sides of the gas chamber (100) respectively, the support seat (500) is fixedly connected to the bottom of the second fixing frame (420), and the top cover (600) is fixedly connected to the top of the first fixing frame (410).

3. The radioactive noble gas detection apparatus according to claim 2, characterized by The top cover (600) and the support seat (500) are both coverless box body structures, and the openings of the top cover (600) and the support seat (500) are both directed towards the gas chamber (100).

4. The radioactive noble gas detection apparatus according to claim 3, characterized by ​ ​ 5. The radioactive noble gas detection apparatus according to claim 4, characterized by The gas chamber (100) is provided with a cylindrical main body (110), a first carbon fiber plate (120) and a second carbon fiber plate (130), and the first carbon fiber plate (120) and the second carbon fiber plate (130) are respectively fixedly arranged at the top and the bottom of the main body (110).

6. The radioactive noble gas detection apparatus according to claim 5, characterized by The first fixed frame (410) has a mounting cavity inside, and the plastic scintillation detector assembly is further provided with a cover plate (260) fixedly connected to the top of the first fixed frame (410), and the scintillator parts of the first plastic scintillation detector (210), the second plastic scintillation detector (220) and the third plastic scintillation detector (230) are arranged in the mounting cavities inside the first fixed frame (410), and the cover plate (260) is provided with three first assembly holes, and the shell parts of the first plastic scintillation detector (210), the second plastic scintillation detector (220) and the third plastic scintillation detector (230) are respectively inserted into one first assembly hole. The first signal processing circuit board (240) is fixedly connected to the top of the cover plate (260).

7. The radioactive noble gas detection apparatus according to claim 6, characterized by The lanthanum bromide crystal detector assembly is further provided with a mounting plate (360) fixedly connected to the inner wall of the support seat (500), and the second signal processing circuit board (330) is fixedly connected to the bottom of the mounting plate (360). The mounting plate (360) is provided with two second assembly holes, and the first lanthanum bromide crystal detector (310) and the second lanthanum bromide crystal detector (320) are respectively fixedly arranged in one second assembly hole.

8. The radioactive noble gas detection apparatus according to claim 7, characterized by The radioactive inert gas detection device is further provided with an air inlet pipe (140) and an air outlet pipe (150), one end of the air inlet pipe (140) and the air outlet pipe (150) is communicated with the gas chamber (100), and the other end of the air inlet pipe (140) and the air outlet pipe (150) is communicated with the exhaust pipe line where the radioactive inert gas is located.

9. The radioactive noble gas detection apparatus according to claim 8, characterized by The radioactive inert gas detection device is further provided with a first source detection bracket (700), a second source detection bracket (710) and a third source detection bracket (720), and the main body (110) wall of the gas chamber (100) is provided with a first source bracket hole, and the axial of one side wall of the base is provided with a second source bracket hole and a third source bracket hole. The first source detection bracket (700), the second source detection bracket (710) and the third source detection bracket (720) are respectively inserted into the first source bracket hole, the second source bracket hole and the third source bracket hole. The bracket groove of the first source detection bracket (700) is located inside the gas chamber (100), and the bracket grooves of the second source detection bracket (710) and the third source detection bracket (720) are located above the first lanthanum bromide crystal detector (310) and the second lanthanum bromide crystal detector (320) inside the base.

10. The radioactive noble gas detection apparatus according to claim 9, characterized by The thickness of the first lead shielding plate (250) is 0.8mm~1.2mm, and the thickness of the second lead shielding plate (340) and the third lead shielding plate (350) is 9mm~11mm.

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