Equipment for measuring radon daughter activity particle size distribution

Abstract

The invention relates to the technical field of radioactive aerosol measurement, and provides equipment which comprises a mixing device and an impactor device, the mixing device is provided with an inlet, a plurality of outlets and a separation cavity, the inlet and the outlets are communicated with the separation cavity, the mixing device is used for separating radioactive aerosol in the separation cavity, and the impactor device is used for impactor measurement. Different primary screening particle sizes have the same surface speed on the tail end plane of the separation cavity, and the radioactive aerosol of each primary screening particle size uniformly enters the corresponding outlet; the number of the impactor devices is multiple, each impactor device is communicated with the corresponding outlet, and the impactor devices are used for separating the radioactive aerosol with the target particle size from the radioactive aerosol with the corresponding preliminary screening particle size and measuring the activity of the radioactive aerosol with the target particle size, and the target particle sizes separated by different impactor devices are different. The equipment provided by the invention can monitor the radon daughter radioactive aerosol activity particle size distribution.

Description

Technical Field

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

[0002] radon( 220 The half-life of radon is short, and the harm of radon mainly comes from radon progeny. Therefore, it is necessary to monitor radon progeny in the environment. The equipment in the prior art only measures the particle size distribution of radon progeny radioactive aerosols, and does not measure the activity of different particle sizes. Therefore, there is an urgent need for a device to monitor the activity particle size distribution of radon progeny radioactive aerosols. Summary of the invention

[0003] In view of this, the embodiments of the present application hope to provide a device for measuring the activity particle size distribution of radon progeny, which can monitor the activity particle size distribution of radon progeny radioactive aerosols.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0005] The embodiment of the present application discloses a device for measuring the activity particle size distribution of radon daughters, the device comprising:

[0006] A mixing device, comprising an inlet, a plurality of outlets and a separation chamber, wherein the inlet and the plurality of outlets are connected to the separation chamber, and the mixing device is used to separate the radioactive aerosol in the separation chamber so that particles of different primary screening particle sizes have the same surface velocity on the terminal plane of the separation chamber, and the radioactive aerosol of each primary screening particle size uniformly enters the corresponding outlet;

[0007] The impactor device includes a plurality of impactor devices, each of which is connected to the corresponding outlet, and is used to separate the radioactive aerosol of the corresponding primary screening particle size into the radioactive aerosol of the target particle size, and can measure the activity of the radioactive aerosol of the target particle size, wherein the target particle sizes separated by different impactor devices are different.

[0008] In one embodiment, the impactor device includes a shell, a filter element and a detector. The shell forms a filter cavity, the filter cavity is connected to the outlet, the filter element and the detector are both arranged in the filter cavity, the filter element is used to filter the radioactive aerosol of the corresponding primary screening particle size to separate the radioactive aerosol of the target particle size, and the detector is used to measure the radioactive aerosol of the target particle size.

[0009] In one embodiment, the direction from the inlet to the outlet is a first direction, and the filter element includes a porous sampling plate and a filter membrane. The porous sampling plate is located on the side of the filter membrane facing the inlet along the first direction, and the porous sampling plate is used to filter the radioactive aerosol with a particle size larger than the target particle size, and the filter membrane is used to receive the radioactive aerosol with the target particle size.

[0010] In one embodiment, the filter element is a wire mesh, and the wire mesh is used to collect the radioactive aerosol of the target particle size.

[0011] In one embodiment, the filter element is detachably disposed in the filter cavity.

[0012] In one embodiment, the shell has an exhaust port connected to the filter chamber, the direction in which the inlet points to the outlet is a first direction, the equipment includes a flow stabilizing device, an air path device and an exhaust pump, the flow stabilizing device is located at one end of the impactor device away from the mixing device along the first direction, the air path device is located at one end of the flow stabilizing device away from the impactor device along the first direction, a plurality of flow channels are arranged in the flow stabilizing device, each of the flow channels is connected to the corresponding exhaust port, the air path device is connected to the exhaust pump, and the air path device is used to control the flow rate in each of the flow channels.

[0013] In one embodiment, the gas path device includes a plurality of mass flow meters and a plurality of valves, each of the mass flow meters and each of the valves are arranged in a corresponding flow channel, and the mass flow meters are used to detect the flow rate and adjust the flow rate through the valves.

[0014] In one embodiment, the device comprises a circuit control device, and the circuit control device is used to control the detector and the gas path device.

[0015] In one embodiment, the number of the impactor devices is seven, and the target particle sizes corresponding to the seven impactor devices are respectively greater than 0 nm, not greater than 5 nm, not greater than 110 nm, not greater than 260 nm, not greater than 450 nm, not greater than 700 nm and not greater than 1000 nm.

[0016] In one embodiment, the apparatus comprises a box and a roller, the mixing device and the impactor device are both arranged in the box, and the roller is arranged on the box.

[0017] The embodiment of the present application discloses a device, which can separate the radon daughter radioactive aerosols entering the separation chamber from the inlet by setting a mixing device, so that different primary screening particle sizes have the same surface velocity on the terminal plane of the separation chamber, and the radioactive aerosols of each primary screening particle size can enter the corresponding outlet evenly, so that the primary separation of radioactive aerosols with different particle sizes can be completed, which can not only improve the accuracy of the device in measuring radioactive aerosols of different particle sizes, but also reduce the separation burden of the subsequent impactor device to separate the target particle size, and improve the service life of the impactor device. By setting up multiple impactor devices, the radioactive aerosols of the primary screening particle size from each outlet can be further separated to separate the radioactive aerosols of the target particle size, and then each impactor device measures the radioactive aerosol of the corresponding target particle size, so that the activity of different target particle sizes can be quickly obtained, and then the distribution of particle size and activity can be obtained, further improving the monitoring accuracy and monitoring efficiency of the monitoring device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 An exploded schematic diagram of a device provided in an embodiment of the present application;

[0019] Figure 2 A flowchart of a device provided in accordance with another embodiment of the present application.

[0020] Description of Reference Numerals

[0021] 100. Equipment; 1. Mixing device; 1a. Inlet; 1b. Outlet; 2. Impactor device; 21. Shell; 21a. Air extraction port; 22. Filter element; 22a. Filter chamber; 22b. Silk screen; 221. Multi-porous sampling plate; 222. Filter membrane; 23. Detector; 3. Flow stabilization device; 3a. Flow channel; 4. Air path device; 41. Mass flow meter; 5. Air extraction pump; 6. Temperature and humidity sensor; 7. Circuit control device; 8. Box; 9. Roller; 10. Display screen. DETAILED DESCRIPTION

[0022] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0023] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The descriptions of "first", "second", etc. in the embodiments of the present application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly including at least one feature. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0024] This application embodiment provides a device, see Figure 1 to Figure 2 The device 100 includes a mixing device 1 and an impactor device 2. The mixing device 1 has an inlet 1a, multiple outlets 1b and a separation chamber. The inlet 1a and the multiple outlets 1b are both connected to the separation chamber. The mixing device 1 is used to separate the radioactive aerosol in the separation chamber so that different primary screening particle sizes have the same surface velocity on the terminal plane of the separation chamber, and the radioactive aerosol of each primary screening particle size evenly enters the corresponding outlet 1b.

[0025] There are multiple impactor devices 2, each of which is connected to the corresponding outlet 1b. The impactor device 2 is used to separate the radioactive aerosol of the corresponding initial screening particle size into the radioactive aerosol of the target particle size, and can measure the activity of the radioactive aerosol of the target particle size, wherein different impactor devices 2 separate different target particle sizes.

[0026] The device 100 provided in the present application can separate the radon daughter radioactive aerosols entering the separation chamber from the inlet 1a by setting the mixing device 1, so as to separate the radioactive aerosols with different primary screening particle sizes having the same surface velocity on the terminal plane of the separation chamber, and the radioactive aerosols of each primary screening particle size can enter the corresponding outlet 1b uniformly, so that the primary separation of radioactive aerosols with different particle sizes can be completed, which can not only improve the accuracy of the device 100 in measuring radioactive aerosols with different particle sizes, but also reduce the separation burden of the subsequent impactor device 2 to separate the target particle size, and improve the service life of the impactor device 2. By setting a plurality of impactor devices 2, the radioactive aerosols of the primary screening particle size from each outlet 1b can be further separated to separate the radioactive aerosols of the target particle size, and then each impactor device 2 measures the radioactive aerosols of the corresponding target particle size, so that the activity of different target particle sizes can be quickly obtained, and then the distribution of particle size and activity can be obtained, further improving the monitoring accuracy and monitoring efficiency of the monitoring device.

[0027] Exemplarily, in one embodiment, the mixing device 1 includes a housing, a straight pipe section and a honeycomb flow guide structure. The housing is formed with a separation chamber, an inlet 1a and an outlet 1b. There are multiple straight pipe sections, which are respectively installed at the inlet 1a and each outlet 1b, so that the accumulation of radon daughter radioactive aerosols in the pipeline and the influence of the flow rate can be reduced. The honeycomb flow guide structure is used to separate the radioactive aerosols entering from the inlet 1a.

[0028] It should be noted that under different flow design conditions, the radioactive aerosol entering the separation chamber can maintain a certain surface velocity at the end of the honeycomb plane of the mixing device 1, ensuring that the radioactive aerosol is evenly distributed at the outlet 1b, thereby improving the accuracy and reliability of the measurement structure.

[0029] It should be noted that the direction from the inlet 1a to the outlet 1b may be a first direction, ie, a general flow direction of the radioactive aerosol.

[0030] Exemplarily, in one embodiment, Figure 1 R1 in the figure may be the first direction.

[0031] For example, in one embodiment, please refer to Figure 1 The volume of the mixing device 1 is smaller than that of the impactor device 2. Thus, on the one hand, the influence of residual radioactive aerosol can be reduced, and the radioactive aerosol remaining in the mixing device 1 from the previous measurement can be reduced to affect the accuracy of the current measurement. On the other hand, the smaller the volume is, the radioactive aerosol in the separation chamber can be emptied in a short time, reducing the influence of the residual radioactive aerosol from the previous measurement on the current measurement result.

[0032] In one embodiment, please refer to Figure 2 The impactor device 2 includes a shell 21, a filter element 22 and a detector 23. The shell 21 is formed with a filter cavity 22a, and the filter cavity 22a is connected to the outlet 1b. The filter element 22 and the detector 23 are both arranged in the filter cavity 22a. The filter element 22 is used to filter the radioactive aerosol of the corresponding primary screening particle size to separate the radioactive aerosol of the target particle size. The detector 23 is used to measure the radioactive aerosol of the target particle size.

[0033] Exemplarily, the filter chamber 22a can be connected to the outlet 1b through a straight pipe section, and the filter element 22 and the detector 23 can be both arranged in the filter chamber 22a, and the filter element 22 is used to filter the radioactive aerosol of the corresponding primary screening particle size to separate the radioactive aerosol of the target particle size, and the detector 23 can measure the activity of the radioactive aerosol of the target particle size. In this way, by forming the filter chamber 22a in the housing 21, the filter element 22 and the detector 23 located in the filter chamber 22a can be protected to reduce the damage to the filter element 22 and the detector 23 by external factors, and to improve the service life of the filter element 22 and the detector 23. By setting the filter element 22 to separate the radioactive aerosol of the required target particle size, and finally using the detector 23 to the radioactive aerosol of the target particle size, the energy scale value of the radioactive aerosol corresponding to the target particle size can be obtained relatively quickly, and then the activity can be calculated using the "integral spectrometer method", and the filtering efficiency and measurement efficiency are high.

[0034] Exemplarily, in one embodiment, the shape of the shell 21 is not limited. For example, the shape of the shell 21 can be cylindrical. In this way, the flow resistance of the radioactive aerosol can be reduced, thereby reducing the energy loss of the radioactive aerosol during the flow process.

[0035] Illustratively, in one embodiment, the detector 23 may be a PIPS detector 23. Thus, detection using the PIPS detector 23 may reduce damage to the sample.

[0036] In one embodiment, please refer to Figure 2 The direction from the inlet 1a to the outlet 1b is a first direction. The filter element 22 includes a porous sampling plate 221 and a filter membrane 222. The porous sampling plate 221 is located on the side of the filter membrane 222 facing the inlet 1a along the first direction. The porous sampling plate 221 is used to filter radioactive aerosols with a particle size larger than the target particle size, and the filter membrane 222 is used to receive radioactive aerosols with a target particle size.

[0037] Exemplarily, the porous sampling plate 221 is formed with a plurality of filter holes to filter out radioactive aerosols having a particle size larger than the target particle size. The porous sampling plate 221 can be disposed on the side of the filter chamber 22a close to the opening along the first direction, and the filter membrane 222 can be disposed on the side of the filter chamber 22a away from the opening along the first direction, so that the radioactive aerosols of the target particle size can fall on the filter membrane 222 after passing through the filter holes, thereby facilitating the detector 23 to measure it.

[0038] It is understandable that the collection rate of the filter membrane 222 can reach more than 99%, so that the detector 23 can easily measure the radioactive aerosol of the target particle size located on the filter membrane 222.

[0039] In one embodiment, please refer to Figure 2 The filter element 22 is a wire mesh 22b, which is used to collect radioactive aerosols of target particle size. Here, the wire mesh 22b can achieve the effect of separating radioactive aerosols of target particle size, and can also collect radioactive aerosols of target particle size, so that not only the collection efficiency meets the requirements, but also the measurement cost is low and durable.

[0040] In one embodiment, please refer to Figure 2 At least one of the plurality of filter elements 22 is a wire mesh 22 b , and the rest of the plurality of filter elements 22 may include a porous sampling plate 221 and a filter membrane 222 .

[0041] In one embodiment, the filter element 22 is detachably disposed in the filter cavity 22a. Exemplarily, the filter element 22 can be detachably disposed in the filter cavity 22a by means of a snap connection. For example, the filter cavity 22a is formed with a mounting platform, and the mounting platform has a slot and a socket, and the filter element 22 can be inserted from the socket into the slot. In this way, the filter element 22 is easily replaced by means of a detachable manner, and the measurement efficiency is high.

[0042] In one embodiment, please refer to Figure 2The shell 21 has an air suction port 21a connected to the filter chamber 22a, and the direction from the inlet 1a to the outlet 1b is the first direction. The equipment 100 includes a flow stabilizing device 3, an air path device 4 and an air suction pump 5. The flow stabilizing device 3 is located on the side of the impactor device 2 away from the mixing device 1 along the first direction. The air path device 4 is located on the side of the flow stabilizing device 3 away from the impactor device 2 along the first direction. A plurality of flow channels 3a are arranged in the flow stabilizing device 3, each flow channel 3a is connected to the corresponding air suction port 21a, the air path device 4 is connected to the air suction pump 5, and the air path device 4 is used to control the flow rate in each flow channel 3a.

[0043] Exemplarily, each shell 21 is provided with an air extraction port 21a on one side away from the outlet 1b along the first direction. The flow stabilizing device 3 is arranged at one end of the impactor device 2 along the first direction away from the mixing device 1, and the gas path device 4 is arranged at one end of the flow stabilizing device 3 along the first direction away from the impactor device 2, that is, along the first direction, there are the mixing device 1, the impactor device 2, the flow stabilizing device 3 and the gas path device 4 in sequence. A plurality of flow channels 3a are arranged in the flow stabilizing device 3, each flow channel 3a is connected to the corresponding air extraction port 21a, and the gas path device 4 is connected to the air extraction pump 5. By arranging the air extraction pump 5, a stable suction force can be provided to ensure that the radon daughter radioactive aerosol continuously and stably enters the mixing device 1 and each impactor device 2 for sampling and measurement. In this way, the vacuum pump 5 works to absorb the radon daughter radioactive aerosol by using the air path device 4, the flow channel 3a, the air suction port 21a, the filter chamber 22a, the outlet 1b, the separation chamber and the inlet 1a. At this time, the radon daughter radioactive aerosol can enter the separation chamber from the inlet 1a. After preliminary separation, the radioactive aerosols of different primary screening particle sizes can enter the corresponding filter chamber 22a through the corresponding outlet 1b, and then the filter element 22 filters them to separate the radioactive aerosols of the target particle size. Finally, the detector 23 can measure the radioactive aerosols of the target particle size. Since the flow rates required for radioactive aerosols of different particle sizes are different, in order to ensure a higher filtering effect and measurement accuracy, the flow rate in each flow channel 3a can be controlled by the air path device 4, and then the flow rate in the filter chamber 22a can be controlled. In this way, the filtering effect when the filter element 22 separates the radioactive aerosol of the target particle size due to excessive or insufficient flow rate can be reduced, so as to improve the accuracy and reliability of the measurement.

[0044] In one embodiment, please refer to Figure 1 and Figure 2 The gas path device 4 includes a plurality of mass flow meters 41 and a plurality of valves. Each mass flow meter 41 and each valve are arranged in a corresponding flow channel 3a. The mass flow meter 41 is used to detect the flow rate and adjust the flow rate through the valve.

[0045] Exemplarily, each flow channel 3a is provided with a mass flow meter 41 and a valve, so that the flow rate in each flow channel 3a can be monitored by the mass flow meter 41. If the flow rate in the flow channel 3a does not reach the preset value, the mass flow meter 41 can adjust the flow rate by adjusting the opening of the valve so that the flow rate in each flow channel 3a reaches the corresponding preset value, with a high degree of automation and measurement efficiency.

[0046] In one embodiment, please refer to Figure 1 The device 100 includes a temperature and humidity sensor 6 for detecting the temperature and humidity of the filter cavity 22a. In this way, the temperature and humidity in the device 100 can be measured by the temperature and humidity sensor 6 to determine the working state of the device 100 and improve the accuracy and reliability of the measurement.

[0047] In one embodiment, please refer to Figure 1 and Figure 2 The device 100 includes a circuit control device 7, which is used to control the detector 23 and the gas path device 4.

[0048] Exemplarily, the circuit control device 7 can be electrically connected to the detector 23 and the mass flow meter 41, so that the activity distribution of radioactive aerosols of different particle sizes can be obtained online by controlling the opening of the detector 23 and the transmission of data, as well as the opening of the mass flow meter 41 and the transmission of data through the circuit control device 7, with a high degree of automation.

[0049] For example, in one embodiment, please refer to Figure 2 The circuit control device 7 includes a detector interface, a multi-channel connection, a signal processing board, a cable, a power supply cabinet, a switch cabinet and a display screen 10. The detector interface is connected to the detector 23. The multi-channel connection is used to connect to the signal processing board of the detector 23. The signal processing board is used to collect data signal conversion and data acquisition. The power supply cabinet and the switch cabinet are used for switching control of the overall power supply voltage. The cable is used for connection and transmission with the circuit. The display screen 10 is used to present the activity distribution of different particle sizes of radon daughter radioactive aerosols, the flow velocity or flow readings in each flow channel 3a, the temperature and humidity readings, and the power readings of each device.

[0050] In one embodiment, the number of the impactor devices 2 is seven, and the target particle sizes corresponding to the seven impactor devices 2 are respectively greater than 0 nm, not greater than 5 nm, not greater than 110 nm, not greater than 260 nm, not greater than 450 nm, not greater than 700 nm and not greater than 1000 nm.

[0051] Exemplarily, the seven impactor devices 2 are respectively a first impactor device 2, a second impactor device 2, a third impactor device 2, a fourth impactor device 2, a fifth impactor device 2, a sixth impactor device 2 and a seventh impactor device 2. The first impactor device 2 can separate radioactive aerosols with a target particle size greater than 0 nm, that is, the first impactor device 2 can measure radioactive aerosols of all particle sizes; the second impactor device 2 can separate radioactive aerosols with a target particle size of 0-5 nm, and measure radioactive aerosols with a target particle size of 0-5 nm; the third impactor device 2 can separate radioactive aerosols with a target particle size of 0-110 nm, and measure radioactive aerosols with a target particle size of 0-110 nm. The fourth impactor device 2 can separate the radioactive aerosol with a target particle size of 0-260nm, and measure the radioactive aerosol with a target particle size of 0-260nm; the fifth impactor device 2 can separate the radioactive aerosol with a target particle size of 0-450nm, and measure the radioactive aerosol with a target particle size of 0-450nm; the sixth impactor device 2 can separate the radioactive aerosol with a target particle size of 0-700nm, and measure the radioactive aerosol with a target particle size of 0-700nm; the seventh impactor device 2 can separate the radioactive aerosol with a target particle size of 0-1000nm, and measure the radioactive aerosol with a target particle size of 0-1000nm. In this way, after subsequent processing, the activity of particles with diameters of 0-5nm, 5nm-110nm, 110nm-250nm, 250nm-450nm, 450nm-700nm and 700nm-1000nm can be measured to improve the accuracy of monitoring radon daughter radioactive aerosols of different particle sizes in the environment.

[0052] Exemplarily, in one embodiment, the first impactor device 2 can measure radioactive aerosols of all particle sizes; the second impactor device 2 can separate radioactive aerosols of a target particle size of 5nm and measure the radioactive aerosols of a target particle size of 5nm; the third impactor device 2 can separate radioactive aerosols of a target particle size of 108nm and measure the radioactive aerosols of a target particle size of 108nm; the fourth impactor device 2 can separate radioactive aerosols of a target particle size of 260nm and measure the radioactive aerosols of a target particle size of 260nm. The fifth impactor device 2 can separate the radioactive aerosol with a target particle size of 430nm, and measure the radioactive aerosol with a target particle size of 430nm; the sixth impactor device 2 can separate the radioactive aerosol with a target particle size of 650nm, and measure the radioactive aerosol with a target particle size of 650nm; the seventh impactor device 2 can separate the radioactive aerosol with a target particle size of 1000nm, and measure the radioactive aerosol with a target particle size of 1000nm.

[0053] Exemplarily, in one embodiment, in order to improve the accuracy and reliability of measurement, the larger the particle size of the radioactive aerosol, the greater the flow velocity in the corresponding flow channel 3a, that is, the flow velocity in the corresponding flow channel 3a of the first impactor device 2 to the seventh impactor device 2 is also getting larger.

[0054] In one embodiment, please refer to Figure 1 The device 100 includes a box 8 and a roller 9, wherein the mixing device 1 and the impactor device 2 are both arranged in the box 8, and the roller 9 is arranged on the box 8. In this way, the box 8 can protect the mixing device 1 and the impactor device 2, and at the same time provide physical protection for the internal precision electronic components, mechanical parts, etc., reduce the damage caused by external factors such as external force collision, falling, vibration, dust, moisture, etc., so as to extend the service life of each part. The roller 9 can be arranged at the bottom of the box 8 to realize the smooth movement of the monitoring device. When in use, the monitoring device can be pushed to the set location for measurement, which has strong flexibility.

[0055] For example, in one embodiment, the mixing device 1 and the impactor device 2, the impactor device 2 and the gas circuit device 4, the impactor device 2 and the flow stabilizing device 3, the impactor device 2 and the circuit control device 7, and the gas circuit device 4 and the air pump 5 are all connected and fixed by flanges, clamps or interfaces, so that they are easy to disassemble for maintenance and replacement. High efficiency.

[0056] Exemplarily, in one embodiment, the preparation work is as follows: before measuring, the device 100 determines whether all devices and parts are in normal working condition, such as checking whether the seven impactor devices 2 are in working condition, checking the inside of the impactor device 2 to ensure that it is clean and dust-free to ensure the accuracy of sampling, ensuring that there is no leakage in the overall gas path, and adjusting the sampling parameters, sampling flow rate and sampling time of each impactor device 2.

[0057] Start the vacuum pump 5: connect the vacuum pump 5 to the gas path device 4, turn on the vacuum pump 5, and suck the radioactive aerosol into the mixing device 1 from the inlet 1a.

[0058] Adjusting the flow rate: According to the need, the flow rate in the corresponding flow channel 3a is adjusted by the mass flow meter 41. A lower speed is set at the beginning, and the speed is slowly adjusted after stabilization to avoid excessive impact on the impactor device 2.

[0059] Adjusting the flow direction: By adjusting the valve in the mixing device 1 , the flow direction of the radon daughter radioactive aerosol is adjusted to ensure that the radon daughter radioactive aerosol can be evenly distributed in each impactor device 2 .

[0060] Adoption and measurement: Radon daughter radioactive aerosols will pass through each impactor device 2 at the same time, and each impactor device 2 will separate the radioactive aerosols of the corresponding target particle size. After 15 minutes, the corresponding detector 23 will be used for measurement.

[0061] Result presentation: After the sampling measurement is completed, the vacuum pump 5 is turned off, and the activity particle size distribution result of the radon daughter radioactive aerosol measured this time is viewed or recorded on the display screen 10.

[0062] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. All modifications, equivalent substitutions, improvements, etc. within the spirit and principles of the present application are included in the protection scope of the present application.

Claims

1. A device for measuring the activity particle size distribution of radon progeny, characterized in that: The device comprises: A mixing device, comprising an inlet, a plurality of outlets and a separation chamber, wherein the inlet and the plurality of outlets are connected to the separation chamber, and the mixing device is used to separate the radioactive aerosol in the separation chamber so that particles of different primary screening particle sizes have the same surface velocity on the terminal plane of the separation chamber, and the radioactive aerosol of each primary screening particle size uniformly enters the corresponding outlet; The impactor device includes a plurality of impactor devices, each of which is connected to the corresponding outlet, and is used to separate the radioactive aerosol of the corresponding primary screening particle size into the radioactive aerosol of the target particle size, and can measure the activity of the radioactive aerosol of the target particle size, wherein the target particle sizes separated by different impactor devices are different.

2. The device according to claim 1, characterized in that The impactor device includes a shell, a filter element and a detector. The shell forms a filter cavity, which is connected to the outlet. The filter element and the detector are both arranged in the filter cavity. The filter element is used to filter the radioactive aerosol of the corresponding primary screening particle size to separate the radioactive aerosol of the target particle size. The detector is used to measure the radioactive aerosol of the target particle size.

3. The device according to claim 2, characterized in that The direction from the inlet to the outlet is a first direction, and the filter element includes a porous sampling plate and a filter membrane. The porous sampling plate is located on the side of the filter membrane facing the inlet along the first direction, and the porous sampling plate is used to filter the radioactive aerosol with a particle size larger than the target particle size, and the filter membrane is used to receive the radioactive aerosol with the target particle size.

4. The device according to claim 2, characterized in that The filter element is a wire mesh, and the wire mesh is used to collect the radioactive aerosol of the target particle size.

5. The device according to claim 2, characterized in that The filter element is detachably arranged in the filter cavity.

6. The device according to claim 2, characterized in that The shell has an air suction port connected to the filter chamber, and the direction in which the inlet points to the outlet is a first direction. The equipment includes a flow stabilizing device, an air path device and an air suction pump. The flow stabilizing device is located at one end of the impactor device away from the mixing device along the first direction. The air path device is located at one end of the flow stabilizing device away from the impactor device along the first direction. A plurality of flow channels are arranged in the flow stabilizing device, each of which is connected to the corresponding air suction port. The air path device is connected to the air suction pump, and the air path device is used to control the flow rate in each of the flow channels.

7. The device according to claim 6, characterized in that The gas path device includes a plurality of mass flow meters and a plurality of valves, each of the mass flow meters and each of the valves are arranged in a corresponding flow channel, and the mass flow meters are used to detect the flow rate and adjust the flow rate through the valves.

8. The device according to claim 7, characterized in that The device comprises a circuit control device, and the circuit control device is used to control the detector and the gas path device.

9. The device according to claim 1, characterized in that The number of the impactor devices is seven, and the target particle sizes corresponding to the seven impactor devices are respectively greater than 0 nm, not greater than 5 nm, not greater than 110 nm, not greater than 260 nm, not greater than 450 nm, not greater than 700 nm and not greater than 1000 nm.

10. The device according to claim 1, characterized in that The device comprises a box body and a roller, the mixing device and the impactor device are both arranged in the box body, and the roller is arranged on the box body.

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