Radon daughter aerosol parallel online measuring device

Abstract

The embodiment of the invention provides a radon daughter aerosol parallel online measurement device. The radon daughter aerosol parallel online measurement device comprises a mixing box with a first gas outlet and a plurality of first detection assemblies. One end of the first detection assembly is communicated with the first air outlet, and the other end of the first detection assembly is provided with a second air outlet, so that a first airflow path from the first air outlet to the second air outlet is formed. The first detection assembly comprises an impact plate, a first shell, a first detector and a collection filter membrane, the impact plate and the collection filter membrane are located in the first shell and are arranged at an interval along the first airflow path, the collection filter membrane is used for collecting at least part of radon daughter aerosol flowing along the first airflow path, and the first detector is arranged between the impact plate and the collection filter membrane; the radon daughter aerosol collected by the collection filter membrane is measured, and the filter apertures of the impact plates of at least part of the first detection assemblies are different. The radon daughter aerosol parallel online measuring device in the embodiment of the invention is high in accuracy and reliability.

Description

Technical Field

[0001] The present application relates to the technical field of radioactive aerosol sampling and measurement, and in particular to a radon daughter aerosol parallel online measurement device. Background Art

[0002] Radon daughter aerosols are radioactive substances formed in the air by radon and its decay products. These substances can be suspended in the air and inhaled by humans, deposited in different parts of the human respiratory tract, posing a serious threat to human health, especially the respiratory system. In order to protect people in high-radon places, the study of radon daughter aerosols has received more and more attention.

[0003] When the radon daughter aerosol sampling and measurement device in the related art measures the radon daughter aerosol, the aerosol particles first pass through a coarse filter, then pass through a fine filter, and finally are collected and analyzed by a detector. However, this measurement method has the problems of particle loss and low sampling efficiency, which makes the accuracy and reliability of the measurement results low. Summary of the invention

[0004] In view of this, the main purpose of the embodiments of the present application is to provide a parallel online measurement device for radon daughter aerosols with high accuracy and reliability.

[0005] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] The embodiment of the present application provides a radon daughter aerosol parallel online measurement device, comprising:

[0007] a mixing box having a first air outlet;

[0008] A plurality of first detection components, one end of the first detection component is communicated with the first air outlet, and the other end of the first detection component has a second air outlet to form a first air flow path from the first air outlet to the second air outlet;

[0009] The first detection assembly includes an impact plate, a first shell, a first detector and a collecting filter membrane. The impact plate and the collecting filter membrane are located in the first shell and are spaced apart along the first airflow path. The collecting filter membrane is used to collect part of the radon daughter aerosol flowing along the first airflow path. The first detector is arranged between the impact plate and the collecting filter membrane to measure the radon daughter aerosol collected by the collecting filter membrane. The filter apertures of at least some of the impact plates of the first detection assemblies are different.

[0010] In one embodiment, the radon daughter aerosol parallel online measurement device further includes a second detection component connected in parallel with the first detection component, one end of the second detection component is connected to the first air outlet, and the other end of the second detection component has a third air outlet to form a second air flow path from the first air outlet to the third air outlet;

[0011] The second detection assembly includes a wire mesh, a second shell and a second detector. The second detector and the wire mesh are spaced apart along the second airflow path. The wire mesh is used to collect part of the radon daughter aerosol flowing along the second airflow path. The second detector is used to measure the radon daughter aerosol collected by the wire mesh.

[0012] In one embodiment, the radon daughter aerosol parallel online measurement device further includes a third detection component connected in parallel with the first detection component, one end of the third detection component is connected to the first air outlet, and the other end of the third detection component has a fourth air outlet to form a third air flow path from the first air outlet to the fourth air outlet;

[0013] The third detection assembly includes the impact plate, a third shell, a third detector and a wire mesh. The impact plate and the wire mesh are located in the third shell and are spaced apart along the third airflow path. The wire mesh is used to collect part of the radon daughter aerosol flowing along the third airflow path. The third detector is arranged between the impact plate and the wire mesh to measure the radon daughter aerosol collected by the wire mesh.

[0014] In one embodiment, the wire mesh cuts off the particle size of the radon daughter aerosol to be less than or equal to 4.3 nm.

[0015] In one embodiment, the filtering pore size of the impact plate is greater than or equal to 0.1 nm and less than or equal to 1000 nm.

[0016] In one embodiment, the mixing box comprises a box body having a first air inlet and the first air outlet;

[0017] The mixing box further comprises a filter screen disposed in the box body, wherein the filter screen is located on the air flow path between the first air inlet and the first air outlet; or,

[0018] The mixing box further comprises a filter screen and a honeycomb. The filter screen and the honeycomb are arranged at intervals along the airflow path from the first air inlet to the first air outlet. The box body has a plurality of first air outlets arranged at intervals.

[0019] In one embodiment, the radon daughter aerosol parallel online measurement device includes a flow control component and an outlet pipe, the outlet pipe is arranged downstream of at least one of the second outlet and the third outlet, and the flow control component is arranged on each outlet pipe.

[0020] In one embodiment, the flow control component includes a valve and a flow meter, the flow meter is used to monitor the flow of the radon daughter aerosol flowing out of the outlet pipe, and the valve is used to adjust the flow of the radon daughter aerosol flowing out of the outlet pipe.

[0021] In one embodiment, the radon daughter aerosol parallel online measurement device includes an air pump, and the air pump is connected to the second air outlet and the third air outlet respectively.

[0022] In one embodiment, the radon daughter aerosol parallel online measurement device includes a processor, and the processor is respectively data-connected to the first detector and the second detector.

[0023] The embodiment of the present application provides a parallel online measurement device for radon daughter aerosols, comprising a mixing box having a first air outlet and a plurality of first detection components. One end of the first detection component is connected to the first air outlet, and the other end of the first detection component has a second air outlet to form a first airflow path from the first air outlet to the second air outlet. The first detection component comprises an impact plate, a first shell, a first detector and a collection filter membrane, the impact plate and the collection filter membrane are located in the first shell, and are arranged at intervals along the first airflow path, the collection filter membrane is used to collect at least part of the radon daughter aerosols flowing along the first airflow path, the first detector is arranged between the impact plate and the collection filter membrane, and is used to measure the radon daughter aerosols collected by the collection filter membrane, and the filter apertures of the impact plates of at least some of the first detection components are different. On the one hand, a plurality of first detection components are connected in parallel, and each first detection component is independently connected to the first air outlet, so that the radon daughter aerosol particles can enter each first detection component relatively evenly, thereby improving the accuracy and reliability of the measurement. On the other hand, by configuring impact plates with different apertures in each first detection assembly, radon progeny aerosol particles of different sizes can be effectively separated and collected, which not only optimizes the detection process but also achieves accurate measurement of radon progeny activity in the entire particle size range. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of a parallel online measurement device for radon daughter aerosols according to an embodiment of the present application, in which the filter screen and the honeycomb in the mixing box are not shown;

[0025] Figure 2This is a schematic structural diagram of a parallel online measurement device for radon daughter aerosols according to another embodiment of the present application, in which the filter screen and the honeycomb in the mixing box are not shown;

[0026] Figure 3 for Figure 2 A schematic diagram of the structure of the first detection assembly, wherein the impact plate and the collection filter membrane are not shown in the figure;

[0027] Figure 4 for Figure 2 A schematic diagram of the structure of the second detection assembly, wherein the wire mesh is not shown in the figure;

[0028] Figure 5 for Figure 2 Schematic diagram of the structure of the third detection component, the impact plate and the screen are not shown in the figure.

[0029] Description of Reference Numerals

[0030] 10. Mixing box; 10a. First air outlet; 10b. First air inlet; 20. First detection assembly; 20a. Second air outlet; 21. First shell; 22. First detector; 30. Second detection assembly; 30a. Third air outlet; 31. Second shell; 32. Second detector; 40. Third detection assembly; 40a. Fourth air outlet; 41. Third shell; 42. Third detector; 50. Flow control assembly; 51. Valve; 52. Flow meter; 60. Air outlet pipe; 70. Air pump. DETAILED DESCRIPTION

[0031] An embodiment of the present application provides a parallel online measurement device for radon daughter aerosols. Figure 1 , Figure 2 and Figure 3 The radon daughter aerosol parallel online measurement device includes a mixing box 10 with a first gas outlet 10a and a plurality of first detection components 20.

[0032] One end of the first detection assembly 20 is communicated with the first air outlet 10a, and the other end of the first detection assembly 20 has a second air outlet 20a to form a first air flow path from the first air outlet 10a to the second air outlet 20a.

[0033] The first detection assembly 20 includes an impact plate, a first shell 21, a first detector 22 and a collecting filter membrane. The impact plate and the collecting filter membrane are located in the first shell 21 and are spaced apart along the first airflow path. The collecting filter membrane is used to collect part of the radon daughter aerosol flowing along the first airflow path. The first detector 22 is arranged between the impact plate and the collecting filter membrane to measure the radon daughter aerosol collected by the collecting filter membrane. The filter apertures of at least some of the impact plates of the first detection assembly 20 are different.

[0034] Specifically, the mixing box 10 can ensure that the radon daughter aerosol particles are evenly distributed, make the radon daughter aerosol diffuse evenly in the source term, and transport the radon daughter aerosol with evenly distributed particles into the first detection assembly 20 .

[0035] The structure of the mixing box 10 is not limited.

[0036] For example, the mixing box 10 includes a box body having a first air inlet and a first air outlet 10a. Radon daughter aerosol enters the mixing box 10 from the first air inlet 10b, and after being uniformly diffused by the source term of the mixing box 10, the radon daughter aerosol with uniformly distributed particles flows out of the first air outlet 10a and enters the first detection assembly 20.

[0037] For another example, the mixing box 10 further includes a filter screen disposed in the box body, and the filter screen is located on the airflow path between the first air inlet 10b and the first air outlet 10a. Thus, large aerosol particles in the air can be filtered through the filter screen, thereby improving the accuracy of the measurement.

[0038] For example, the mixing box further includes a filter and a honeycomb, and the filter and the honeycomb are arranged at intervals along the airflow path from the first air inlet 10b to the first air outlet 10a, and the box body has a plurality of first air outlets 10a arranged at intervals. Thus, on the one hand, large aerosol particles in the air are filtered by the filter, and on the other hand, the radon daughter aerosol is uniformly diffused by the honeycomb, so that the radon daughter aerosol particles passing through the first air outlet 10a are more uniform, thereby further improving the accuracy of the measurement results.

[0039] Specifically, the radon daughter aerosol enters the mixing box 10 from the first air inlet 10b, passes through the filter screen and the honeycomb in sequence, and flows out from the first air outlet 10a.

[0040] The box has a plurality of first air outlets 10a, for example, a plurality of first air outlets 10a are provided on the side wall of the mixing box 10 on the side close to the first detection assembly 20, and the plurality of first air outlets 10a are arranged at intervals on the side wall of the box. Thus, the radon daughter aerosol can enter each first detection assembly 20 evenly.

[0041] The impact plate is provided with filter holes for filtering and sampling radon daughter aerosol particles entering the first detection assembly 20 through the first gas outlet 10a.

[0042] The filter holes on the impact plate can intercept radon daughter aerosol particles whose particle size exceeds the aperture of the filter holes, and allow radon daughter aerosol particles whose particle size is smaller than the aperture of the filter holes to pass through.

[0043] The aperture of the filter holes on the impact plate is not limited, as long as the particles in the radon daughter aerosol whose particle size is smaller than the aperture of the impact plate can pass through.

[0044] Exemplarily, the filter pore size of the impact plate is greater than or equal to 0.1 nm and less than or equal to 1000 nm. For example, the filter pore size of the impact plate is 0.1 nm, 100 nm, 108 nm, 200 nm, 400 nm, 600 nm, 800 nm or 1000 nm.

[0045] The different filter apertures of the impact plates of at least some of the first detection assemblies 20 may be different in the filter apertures of the impact plates of each first detection assembly 20, or may be different in the filter apertures of the impact plates of some of the first detection assemblies 20. This allows graded sampling of radon daughter aerosols.

[0046] The collection filter membrane is used to collect radon daughter aerosol particles after being filtered by the impact plate.

[0047] The first detector 22 is used to measure the radon daughter aerosol particles collected on the collection filter.

[0048] Along the first airflow path, the radon daughter aerosol passes through the impact plate, the first detector 22 and the collection filter membrane in sequence.

[0049] In the related art, radon daughter aerosol sampling and measurement devices usually adopt a series structure, that is, radon daughter aerosol particles first pass through a coarse filter, then a fine filter, and finally are collected and measured by a detector. However, the series structure has problems of particle loss and low sampling efficiency, resulting in the collected radon daughter aerosol samples being unrepresentative, which in turn affects the accuracy and reliability of the measurement.

[0050] The radon daughter aerosol parallel online measurement device of the embodiment of the present application includes a mixing box 10 having a first air outlet 10a and a plurality of first detection components 20. One end of the first detection component 20 is connected to the first air outlet 10a, and the other end of the first detection component 20 has a second air outlet 20a to form a first air flow path from the first air outlet 10a to the second air outlet 20a. The first detection component 20 includes an impact plate, a first shell 21, a first detector 22 and a collection filter membrane. The impact plate and the collection filter membrane are located in the first shell 21 and are arranged at intervals along the first air flow path. The collection filter membrane is used to collect at least part of the radon daughter aerosol flowing along the first air flow path. The first detector 22 is arranged between the impact plate and the collection filter membrane to measure the radon daughter aerosol collected by the collection filter membrane. The filter apertures of the impact plates of at least some of the first detection components 20 are different. On the one hand, a plurality of first detection components 20 are connected in parallel, and each first detection component 20 is independently connected to the first gas outlet 10a, so that the radon daughter aerosol particles can enter each first detection component 20 relatively evenly, thereby improving the accuracy and reliability of the measurement. On the other hand, by configuring impact plates with different apertures in each first detection component 20, radon daughter aerosol particles of different particle sizes can be effectively separated and collected, which not only optimizes the detection process, but also realizes the accurate measurement of radon daughter activity in the full particle size range.

[0051] In one embodiment, please refer to Figure 1 , Figure 2 and Figure 4 The radon daughter aerosol parallel online measurement device also includes a second detection component 30 connected in parallel with the first detection component 20, one end of the second detection component 30 is connected to the first air outlet 10a, and the other end of the second detection component 30 has a third air outlet 30a to form a second air flow path from the first air outlet 10a to the third air outlet 30a.

[0052] The second detection assembly 30 includes a wire mesh, a second housing 31 and a second detector 32. The second detector 32 and the wire mesh are arranged at intervals along the second airflow path. The wire mesh is used to collect part of the radon daughter aerosol flowing along the second airflow path. The second detector 32 is used to measure the radon daughter aerosol collected by the wire mesh. Therefore, by arranging the second detection assembly 30 and the first detection assembly 20 in parallel and arranging the wire mesh in the second detection assembly 30, accurate measurement of the radon daughter activity in the full particle size range can be achieved.

[0053] Specifically, one end of the second detection assembly 30 is connected to the first gas outlet 10a, so that the second detection assembly 30 is connected in parallel with the first detection assembly 20. This can improve the sampling efficiency and the uniformity of the radon daughter aerosol particle distribution, reduce particle loss, and thus improve the accuracy and reliability of the measurement.

[0054] The wire mesh can cut off the smaller particles in the radon daughter aerosol and allow the larger radon daughter aerosol particles to pass through.

[0055] The wire mesh can not only filter the radon daughter aerosol particles, but also collect the cut-off radon daughter aerosol particles.

[0056] In a specific embodiment, the wire mesh cuts off the particle size of the radon daughter aerosol less than or equal to 4.3 nm. That is, the wire mesh collects particles with a particle size less than 4.3 nm in the radon daughter aerosol, and filters particles with a particle size greater than 4.3 nm in the radon daughter aerosol.

[0057] In another specific embodiment, the wire mesh collects particles with a diameter less than 5 nm in the radon daughter aerosol, and filters particles with a diameter greater than 5 nm in the radon daughter aerosol.

[0058] The second detector 32 is used to measure the radon daughter aerosol particles collected by the wire mesh.

[0059] Along the second airflow path, the radon daughter aerosol passes through the second detector 32 and the wire mesh in sequence.

[0060] In a specific embodiment, a plurality of first air outlets 10a are provided on the side wall of the mixing box 10 on the side close to the first detection assembly 20. The plurality of first air outlets 10a are arranged at intervals on the side wall of the box, and one end of each first detection assembly 20 and one end of the second detection assembly 30 are connected to the first air outlets 10a in a one-to-one correspondence. Thus, the parallel design of each first detection assembly 20 and the second detection assembly 30 is realized, and the radon daughter aerosol can be uniformly entered into each first detection assembly 20 and the second detection assembly 30.

[0061] In one embodiment, please refer to Figure 2 and Figure 5 The radon daughter aerosol parallel online measurement device also includes a third detection component 40 connected in parallel with the first detection component 20, one end of the third detection component 40 is connected to the first air outlet 10a, and the other end of the third detection component 40 has a fourth air outlet 40a to form a third air flow path from the first air outlet 10a to the fourth air outlet 40a.

[0062] The third detection assembly 40 includes an impact plate, a third housing 41, a third detector 42 and a wire mesh. The impact plate and the wire mesh are located in the third housing 41 and are arranged at intervals along the third airflow path. The wire mesh is used to collect part of the radon daughter aerosol flowing along the third airflow path. The third detector 42 is arranged between the impact plate and the wire mesh to measure the radon daughter aerosol collected by the wire mesh. Therefore, by simultaneously arranging the impact plate and the wire mesh in the third detection assembly 40, the radon daughter aerosol is further graded and filtered, which can make the detection result of the detector more accurate.

[0063] Specifically, one end of the third detection assembly 40 is connected to the first gas outlet 10a, so that the third detection assembly 40 is connected in parallel with the first detection assembly 20. This can improve the sampling efficiency and the uniformity of the radon daughter aerosol particle distribution, reduce particle loss, and thus improve the accuracy and reliability of the measurement.

[0064] The third detector 42 is used to measure the radon daughter aerosol particles collected on the wire mesh.

[0065] Along the third gas flow path, the radon daughter aerosol passes through the impact plate, the third detector 42 and the wire mesh in sequence.

[0066] In a specific embodiment, the third detection assembly 40 includes an impact plate, a third housing 41, a third detector 42, a wire mesh and a collection filter membrane. The wire mesh, the impact plate and the collection filter membrane are located in the third housing 41 and are arranged at intervals along the third airflow path. The wire mesh is used to filter and collect part of the radon daughter aerosol flowing along the third airflow path. The collection filter membrane is used to collect the radon daughter aerosol filtered by the impact plate. The third detector 42 is arranged between the impact plate and the collection filter membrane to measure the radon daughter aerosol collected by the collection filter membrane. First, the radon daughter aerosol particles with small particle size are filtered by the wire mesh, and then the radon daughter aerosol filtered by the wire mesh is further filtered by the impact plate, and finally collected by the collection filter membrane, thereby further filtering the radon daughter aerosol, so that the detection result of the detector is more accurate.

[0067] Specifically, along the third airflow path, the radon daughter aerosol passes through the wire mesh, the impact plate, the third detector 42 and the collection filter membrane in sequence. In a specific embodiment, a plurality of first air outlets 10a are provided on the side wall of the mixing box 10 on the side close to the first detection assembly 20, and the plurality of first air outlets 10a are arranged at intervals on the side wall of the box, and one end of each first detection assembly 20, one end of the second detection assembly 30 and one end of the third detection assembly 40 are respectively connected to the first air outlet 10a. Thus, the parallel design of each first detection assembly 20, the second detection assembly 30 and the third detection assembly 40 is realized, and the radon daughter aerosol can be uniformly entered into each first detection assembly 20, the second detection assembly 30 and the third detection assembly 40.

[0068] In one embodiment, the plurality of impact plates are respectively a first impact plate, a second impact plate, a third impact plate, a fourth impact plate and a fifth impact plate, the first impact plate has a filtration aperture of 108 nm, the second impact plate has a filtration aperture of 200 nm, the third impact plate has a filtration aperture of 400 nm, the fourth impact plate has a filtration aperture of 600 nm, and the fifth impact plate has a filtration aperture of 1000 nm. Thus, by setting impact plates with different filtration apertures, radon daughter aerosol particles of different particle sizes can be effectively separated, and by performing graded measurement of the radon daughter aerosol activity, the measurement result is more accurate.

[0069] Specifically, the first impact plate, the second impact plate, the third impact plate, the fourth impact plate and the fifth impact plate are respectively located in different first detection assemblies 20. Thus, radon daughter aerosol particles of different particle sizes are collected by different first detection assemblies 20, so as to achieve graded measurement of radon daughter aerosol particles and obtain more accurate measurement results.

[0070] In other embodiments, at least two of the first impact plate, the second impact plate, the third impact plate, the fourth impact plate and the fifth impact plate are located in the same first detection assembly 20. Thus, the radon daughter aerosol particles entering the first detection assembly 20 are filtered in layers, thereby improving the measurement efficiency.

[0071] In one embodiment, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 The parallel online measurement device for radon daughter aerosol includes a flow control component 50 and an outlet pipe 60. The outlet pipe 60 is disposed downstream of at least one of the second outlet 20a and the third outlet 30a, and each outlet pipe 60 is provided with a flow control component 50. Thus, the flow of the outlet pipe 60 is adjusted by the flow control component 50, so that the flow of the radon daughter aerosol is kept in a stable range during the measurement process.

[0072] Specifically, the gas outlet pipe 60 refers to a pipe connected to the gas outlet, and is a component used for discharging radon daughter aerosol from the measurement component.

[0073] That the outlet pipe 60 is arranged downstream of at least one of the second air outlet 20a and the third air outlet 30a means that the outlet pipe 60 can be arranged only downstream of the second air outlet 20a, or only downstream of the third air outlet 30a, or simultaneously downstream of the second air outlet 20a and the third air outlet 30a.

[0074] In a specific embodiment, an outlet pipe 60 is provided downstream of at least one of the second outlet 20a, the third outlet 30a and the fourth outlet 40a, and a flow control component 50 is provided on each outlet pipe 60. Thus, the flow of the outlet pipe 60 is adjusted by the flow control component 50, so that the flow of the radon daughter aerosol is kept in a stable range during the measurement process.

[0075] That the outlet pipe 60 is arranged downstream of at least one of the second air outlet 20a, the third air outlet 30a and the fourth air outlet 40a means that the outlet pipe 60 can be arranged downstream of only one of the second air outlet 20a, the third air outlet 30a or the fourth air outlet 40a, or downstream of any two of the second air outlet 20a, the third air outlet 30a and the fourth air outlet 40a, or downstream of the second air outlet 20a, the third air outlet 30a and the fourth air outlet 40a at the same time.

[0076] The outlet pipe 60 is provided with a flow control assembly 50 , and the flow control assembly 50 is used to adjust and control the flow of the radon daughter aerosol passing through the outlet pipe 60 .

[0077] The specific structure of the flow control component 50 is not limited.

[0078] For example, the flow control assembly includes a valve 51 and a flow meter 52, wherein the flow meter 52 is used to monitor the flow of the radon daughter aerosol flowing out of the outlet pipe 60, and the valve 51 is used to adjust the flow of the radon daughter aerosol flowing out of the outlet pipe 60. Thus, the flow of the radon daughter aerosol in the outlet pipe 60 is detected in real time by the flow meter 52, and the flow of the radon daughter aerosol is adjusted by the valve 51, so that the flow of the radon daughter aerosol is kept consistent and accurate during the measurement process.

[0079] In one embodiment, please refer to Figure 1 and Figure 2 The radon daughter aerosol parallel online measurement device includes an air pump 70, and the air pump 70 is connected to the second air outlet 20a and the third air outlet 30a respectively. Therefore, the air pump 70 can provide a stable suction force to the radon daughter aerosol parallel online measurement device, and ensure that the radon daughter aerosol passes through each first measurement component and the second measurement component uniformly as much as possible, so that the first measurement component and the second measurement component complete the sampling task.

[0080] Specifically, the adjustment method of the air pump 70 is not limited, and it can be achieved by manual control or by an automated system. For example, manual control allows the operator to adjust the working state of the air pump 70 in real time according to actual conditions. The automated adjustment relies on sensors and control systems, which can automatically adjust the working state of the air pump 70 according to environmental conditions. Whether in an indoor low-concentration environment or a high-radon concentration environment, by properly adjusting the suction and flow of the air pump 70, the radon daughter aerosol parallel online measurement device can achieve efficient sampling, thereby improving the applicability and flexibility of the radon daughter aerosol parallel online measurement device.

[0081] In a specific embodiment, the air pump 70 is connected to the second air outlet 20a, the third air outlet 30a and the fourth air outlet 40a respectively, thereby ensuring that the radon daughter aerosol passes through the first measurement component, the second measurement component and the third measurement component as evenly as possible, so that the first measurement component, the second measurement component and the third measurement component complete the sampling task.

[0082] In a specific embodiment, the vacuum pump 70 is connected to the second air outlet 20a, the third air outlet 30a and the fourth air outlet 40a respectively, and valves 51 and flow meters 52 are arranged downstream of the second air outlet 20a, the third air outlet 30a and the fourth air outlet 40a, the flow meter 52 is used to monitor the flow of radon daughter aerosol flowing out of the detection assembly connected thereto, and the valve 51 is used to adjust the flow of radon daughter aerosol flowing out of the detection assembly connected thereto. Thus, the parallel online measurement device for radon daughter aerosol can not only adapt to different sampling environments, but also ensure the sampling efficiency and accuracy of each detection assembly, thereby significantly improving the performance and reliability of the parallel online measurement device for radon daughter aerosol.

[0083] In one embodiment, the radon daughter aerosol parallel online measurement device includes a processor, and the processor is respectively connected to the first detector 22 and the second detector 32. Thus, the radon daughter aerosol parallel online measurement device can realize online measurement of the activity of radon daughter aerosols of different particle sizes, thereby making the measurement data more accurate and reliable.

[0084] Specifically, the processor is data-connected with the first detector 22 and the second detector 32 respectively, which means that the processor and the first detector 22 can be connected via a line or via Bluetooth. The processor and the second detector 32 can be connected via a line or via Bluetooth.

[0085] In a specific embodiment, the processor is data-connected to the first detector 22 , the second detector 32 , and the third detector 42 , respectively.

[0086] In one embodiment, the radon daughter aerosol parallel online measurement device further includes a pressure gauge, which is connected to the second gas outlet 20a, the third gas outlet 30a and the fourth gas outlet 40a respectively, so as to monitor the pressure in the gas circuit in real time and ensure that the system operates within the set parameter range.

[0087] In the description of the present application, the description with reference to the terms "in one embodiment", "in some embodiments", "in a specific embodiment", or "exemplary" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0088] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A radon daughter aerosol parallel online measurement device, It is characterized in that include: a mixing box having a first air outlet; A plurality of first detection components, one end of the first detection component is communicated with the first air outlet, and the other end of the first detection component has a second air outlet to form a first air flow path from the first air outlet to the second air outlet; The first detection assembly includes an impact plate, a first shell, a first detector and a collecting filter membrane. The impact plate and the collecting filter membrane are located in the first shell and are spaced apart along the first airflow path. The collecting filter membrane is used to collect part of the radon daughter aerosol flowing along the first airflow path. The first detector is arranged between the impact plate and the collecting filter membrane to measure the radon daughter aerosol collected by the collecting filter membrane. The filter apertures of at least some of the impact plates of the first detection assemblies are different.

2. The radon daughter aerosol parallel online measurement device according to claim 1, It is characterized in that The radon daughter aerosol parallel online measurement device also includes a second detection component connected in parallel with the first detection component, one end of the second detection component is connected to the first air outlet, and the other end of the second detection component has a third air outlet to form a second air flow path from the first air outlet to the third air outlet; The second detection assembly includes a wire mesh, a second shell and a second detector. The second detector and the wire mesh are spaced apart along the second airflow path. The wire mesh is used to collect part of the radon daughter aerosol flowing along the second airflow path. The second detector is used to measure the radon daughter aerosol collected by the wire mesh.

3. The radon daughter aerosol parallel online measuring device according to claim 1, It is characterized in that The radon daughter aerosol parallel online measurement device also includes a third detection component connected in parallel with the first detection component, one end of the third detection component is communicated with the first air outlet, and the other end of the third detection component has a fourth air outlet to form a third air flow path from the first air outlet to the fourth air outlet; The third detection assembly includes the impact plate, a third shell, a third detector and a wire mesh. The impact plate and the wire mesh are located in the third shell and are spaced apart along the third airflow path. The wire mesh is used to collect part of the radon daughter aerosol flowing along the third airflow path. The third detector is arranged between the impact plate and the wire mesh to measure the radon daughter aerosol collected by the wire mesh.

4. The radon daughter aerosol parallel online measuring device according to claim 2, It is characterized in that The wire mesh cuts off the particle size of the radon daughter aerosol to be less than or equal to 4.3 nm.

5. The radon daughter aerosol parallel online measuring device according to claim 1, It is characterized in that The filtering pore size of the impact plate is greater than or equal to 0.1 nm and less than or equal to 1000 nm.

6. The radon daughter aerosol parallel online measuring device according to any one of claims 1 to 5, It is characterized in that The mixing box comprises a box body having a first air inlet and the first air outlet; The mixing box further comprises a filter screen disposed in the box body, wherein the filter screen is located on the air flow path between the first air inlet and the first air outlet; or, The mixing box further comprises a filter screen and a honeycomb. The filter screen and the honeycomb are arranged at intervals along the airflow path from the first air inlet to the first air outlet. The box body has a plurality of first air outlets arranged at intervals.

7. The radon daughter aerosol parallel online measuring device according to any one of claims 2 to 5, It is characterized in that The radon daughter aerosol parallel online measurement device comprises a flow control component and an air outlet pipe, wherein the air outlet pipe is arranged downstream of at least one of the second air outlet and the third air outlet, and each of the air outlet pipes is respectively provided with the flow control component.

8. The radon daughter aerosol parallel online measuring device according to claim 7, It is characterized in that The flow control component includes a valve and a flow meter. The flow meter is used to monitor the flow of the radon daughter aerosol flowing out of the outlet pipe, and the valve is used to adjust the flow of the radon daughter aerosol flowing out of the outlet pipe.

9. The radon daughter aerosol parallel online measuring device according to any one of claims 2 to 5, It is characterized in that The radon daughter aerosol parallel online measurement device comprises an air pump, and the air pump is connected to the second air outlet and the third air outlet respectively.

10. The radon daughter aerosol parallel online measuring device according to any one of claims 2 to 5, It is characterized in that The radon daughter aerosol parallel online measurement device comprises a processor, and the processor is respectively connected with the first detector and the second detector in data connection.

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