A double-chamber radon detector calibration device

Abstract

The present invention provides a calibration device for a dual-chamber radon detector, characterized in that it includes a radon chamber and its auxiliary structures, a comprehensive controller, an environmental radon concentration monitoring device, a radon leakage voice-controlled alarm device, a computer management control system for the radon chamber, a wall-mounted large-screen display system, and a mobile terminal software; a multi-parameter monitoring system for the radon chamber and a temperature and humidity control system are installed inside the radon chamber; the comprehensive controller is connected to the multi-parameter monitoring system for the radon chamber, the temperature and humidity control system, and the environmental radon concentration monitoring device through an RS485 bus; the control signal of the comprehensive controller is connected to the control components of the radon chamber and its auxiliary structures and the radon leakage voice-controlled alarm device; the computer management control system for the radon chamber is connected to the comprehensive controller through a USB interface, connected to the wall-mounted large-screen display system through an HDMI interface, and connected to the mobile terminal software through a cloud network; the computer management control system for the radon chamber monitors the entire set of calibration devices for the radon detector; the present invention has the advantages of being fully automatic and intelligent.

Description

Technical Field

[0001] The present invention relates to the field of measurement, and particularly to a radon detector calibration device and method, aiming to solve the problem of automatic control during the calibration process of a radon detector and enable remote monitoring. It provides a fast, convenient, and reliable detection technique and solution for the calibration of radon detectors. Background Art

[0002] Radon is a tracer element, and the radon gas measurement technology in soil is widely used in fields such as resource exploration, geological structure exploration, ground subsidence exploration, and coalfield underground natural area exploration. Radon is a radioactive nuclide. Once inhaled into the human body, it will damage the human lungs and increase the possibility of inducing lung cancer. It is one of the main pollutants harmful to the human body in the environment.

[0003] In order to achieve the purpose of radon gas measurement, a radon detector must be used for radon gas measurement. As a legal measuring instrument, whether the measurement value of a radon detector is accurate directly affects the measurement result, thus affecting the environmental assessment effect and the actual exploration application effect.

[0004] The radon detector calibration device and method are special equipment and methods for radon detector calibration. The radon detector calibration device, also known as a radon chamber, is mainly used for comparison between laboratories, calibration of a large number of radon accumulation detectors and radon progeny measuring instruments, and various scientific experiments and basic research under different radon concentrations, temperatures, and humidities. For a radon chamber used for large-scale instrument calibration, the change in radon concentration is determined by the radon source supply rate, the radon decay rate, the system leakage rate, and the adsorption rate. Therefore, the system is not easy to control, there are many influencing factors, and the construction price is relatively high, but the volume can be very large.

[0005] The large-scale belt-type multi-functional radon chamber built by the China Institute of Atomic Energy in 2006 has a main chamber volume of approximately 14.16 m 3 , and the effective sampling area is about 10 m 3 . The standard radon chamber adopts a dynamic balance belt type, with a large sampling volume, and can be used for testing and calibration of various active and passive instruments.

[0006] National metrology departments such as the National Institute of Metrology of China and the National Institute of Testing Technology of China have successively built standard radon chambers in recent years. The establishment of these standard radon chambers plays an important role in unifying the national radon concentration value. With the rapid economic development and the improvement of people's living standards, the demand for mineral resource exploration, radon investigation, and control is becoming increasingly prominent. Therefore, establishing radon chambers and radon measurement standards and carrying out the value transfer of radon detectors in various regions and nationwide has become a necessary and urgent task.

[0007] Currently, existing radon chambers all adopt a single-chamber structure and cannot complete the automatic control of all multi-concentration points, which brings many inconveniences to the radon detector calibration work. Summary of the Invention

[0008] The object of the present invention is to adopt a dual-chamber design scheme, an automatic control method for the radon concentration in the radon chamber, and combine means such as remote monitoring and environmental monitoring to provide a fully automatic calibration scheme for radon detectors. The dual-chamber design is beneficial to reducing radon emissions and optimizing the calibration process, etc. The method provided by the present invention is reasonable, has a sufficient theoretical basis, and the implemented technical solution is mature and feasible. It can solve comprehensive problems such as work efficiency, calibration automation, and environmental radon monitoring and protection during the current calibration process of radon detectors. It is an advanced radon detector calibration device and method.

[0009] The technical solution adopted to achieve the above invention object is characterized in that: it includes a radon chamber and its auxiliary structure, a comprehensive controller, an environmental radon concentration monitoring device, a radon leakage sound control alarm device, a radon chamber computer management control system, a wall-mounted large-screen display system, and a mobile terminal software; a radon chamber multi-parameter monitoring system and a temperature and humidity control system are installed inside the radon chamber; the comprehensive controller is connected to the radon chamber multi-parameter monitoring system, the temperature and humidity control system, and the environmental radon concentration monitoring device through the RS485 bus; the control signal of the comprehensive controller is connected to the control components of the radon chamber and its auxiliary structure and the radon leakage sound control alarm device; the radon chamber computer management control system is connected to the comprehensive controller through the USB interface, connected to the wall-mounted large-screen display system through the HDMI interface, and connected to the mobile terminal software through the cloud network; the radon chamber computer management control system monitors the entire set of radon detector calibration device.

[0010] A radon detector calibration device with a double-chamber according to the present invention is characterized in that: the radon chamber and its accessory structures include a main radon chamber, a multi-parameter monitoring system 1 for the radon chamber, a secondary radon chamber, a multi-parameter monitoring system 2 for the radon chamber, a temperature and humidity controller, air pump 1, air pump 2, air pump 3, air pump 4, air pump 5, a flow-adjustable air pump, solenoid valve 1, solenoid valve 2, solenoid valve 3, solenoid valve 4, solenoid valve 5, solenoid valve 6, solenoid valve 7, solenoid valve 8, solenoid valve 9, solenoid valve 10, solenoid valve 11, manual valve 1, manual valve 2, manual valve 3, manual valve 4, fan 1, fan 2, fan 3, fan 4, fan 5, fan 6, activated carbon, a 50L radon source mixing chamber, a solid radon source, and a lead shielding chamber; wherein the multi-parameter monitoring system 1 for the radon chamber is installed inside the main radon chamber and includes a temperature and humidity monitoring device, a pressure monitoring device, an alpha energy spectrum radon measurement device, and an ionization chamber-based radon concentration standard; wherein the multi-parameter monitoring system 2 for the radon chamber is installed inside the secondary radon chamber and includes a temperature and humidity monitoring device, a pressure monitoring device, and an ionization chamber-based radon concentration standard; the temperature and humidity controller is installed inside the main radon chamber; the solid radon source is installed inside the lead shielding chamber, and the lead shielding chamber is placed inside the 50L radon source mixing chamber; the lead shielding body cavity is equipped with electric pump 1 and electric pump 2 for extracting radon into the radon source mixing chamber, with one electric pump in reserve and one electric pump working; the 50L radon source mixing chamber is equipped with fan 1 and fan 2 for evenly mixing the radon source, with one fan in reserve and one fan working; the radon source mixing chamber is connected to the main radon chamber through solenoid valve 1, solenoid valve 2, solenoid valve 3, manual valve 1, manual valve 2, the flow-adjustable air pump, and a flowmeter to establish an air path circulation connection; the radon source mixing chamber is connected to the secondary radon chamber through solenoid valve 6, solenoid valve 7, manual valve 3, manual valve 4, and air pump 5 to establish an air path circulation connection; the main radon chamber is connected to the secondary radon chamber through solenoid valve 8, solenoid valve 9, and air pump 3 to establish an air path circulation connection; the main radon chamber is connected to the indoor atmosphere through solenoid valve 4 and is connected to the outdoor atmosphere through solenoid valve 10 and air pump 4 via activated carbon; the secondary radon chamber is connected to the indoor atmosphere through solenoid valve 5 and is connected to the outdoor atmosphere through solenoid valve 10 and air pump 4 via activated carbon;

[0011] A radon detector calibration device with a double-chamber according to the present invention is characterized in that: the comprehensive controller includes four parts: a control circuit, a drive circuit, a parameter management circuit, and an interface circuit; wherein the interface circuit receives the command signal from the computer management control system of the radon chamber, sends a control signal by the control circuit, and drives the control signal by the drive circuit to control the solenoid valve and the air pump to perform corresponding operations; the interface circuit also receives the command signal from the computer management control system of the radon chamber to read the temperature and humidity monitoring parameters, pressure monitoring parameters, alpha energy spectrum radon measurement information, and radon measurement information of the ionization chamber-based radon concentration standard in the main radon chamber, and to read the temperature and humidity monitoring parameters, pressure monitoring parameters, and radon measurement information of the ionization chamber-based radon concentration standard in the secondary radon chamber;

[0012] A radon measuring instrument calibration device with a double-chamber according to the present invention is characterized in that: the environmental radon concentration monitoring device is an ionization chamber radon measuring instrument with an RS485 interface, installed at a position of 0.8 m to 1.5 m in the indoor environment air where the radon chamber is located, and is used for real-time monitoring of the air radon concentration in the environment; the wall-mounted large-screen display system is a liquid crystal display screen installed on the wall, and is a display device for real-time large-screen display of the control state and monitoring parameters of the radon chamber.

[0013] A radon measuring instrument calibration device with a double-chamber according to the present invention is characterized in that: the radon leakage sound control alarm device includes a speaker, a warning light, a driving power supply, and a control interface; the radon chamber computer management control system reads the radon monitoring data of the environmental radon concentration monitoring device through the integrated controller. When it is judged that the value exceeds the warning value, a warning instruction is sent to the integrated controller. After receiving the warning instruction, the integrated controller controls the speaker and the warning light of the radon leakage sound control alarm device through the control interface via the driving power supply.

[0014] A radon measuring instrument calibration device with a double-chamber according to the present invention is characterized in that: the radon chamber computer management control system includes a computer, a display interface, control software, and a radon chamber parameter monitoring database; among them, the control software executes the radon chamber control process, the display interface displays the control state and monitoring data of the radon chamber, and the radon chamber parameter monitoring database stores the historical data of the temperature, humidity, air pressure, and radon concentration monitored in the radon chamber; the computer is connected to the workbench display and the wall-mounted large-screen display system at the same time.

[0015] A radon measuring instrument calibration device with a double-chamber according to the present invention is characterized in that: for the mobile phone terminal software, a radon chamber operation software is installed on the mobile phone terminal, and it is connected to the radon chamber computer management control system through the network cloud platform, and can remotely monitor and control the working state of the radon chamber.

[0016] A radon measuring instrument calibration device with a double-chamber according to the present invention is characterized in that: the secondary radon chamber is respectively connected to the main radon chamber and the radon source mixing chamber. It can obtain radon from the main radon chamber in a manual control mode, or obtain radon from the secondary radon chamber. The internal radon concentration is detected by a standard device. When the radon concentration reaches the expected radon concentration target, the valve can be closed to seal the radon chamber so that it can maintain a relatively stable radon concentration level for a long time. It can also manually supplement radon from the radon source mixing chamber into the mixing chamber to keep it at the corresponding radon concentration level for a long time.

[0017] A radon measuring instrument calibration device with a double-chamber according to the present invention is characterized in that: the radon chamber computer management control system monitors the entire set of radon measuring instrument calibration devices. The specific control work process for the main radon chamber is as follows:

[0018] Open the radon chamber, ensure that the manual valve is open, start the radon chamber after setting the parameters; Check whether the radon chamber leaks. If it leaks, an air leakage alarm will be issued. Check the airtightness and dispose of it, then re-check whether the radon chamber leaks until the detection passes;

[0019] After passing the air leakage detection, check whether radon chamber temperature and humidity control is required. If temperature and humidity control is required, perform temperature control until the set temperature and humidity points are reached, and then start the control of concentration point 1. If temperature and humidity control is not required, directly start the control of concentration point 1. Maintain for the corresponding duration at radon concentration point 1, and perform intermittent micro-radon supplementation every 1 hour to keep the radon concentration in the radon chamber constant;

[0020] After completing the control of radon chamber radon concentration point 1, automatically determine whether to control radon chamber radon concentration point 2. If controlling radon chamber radon concentration point 2, enter the control process of concentration point 2. If not controlling radon chamber radon concentration point 2, determine whether to exhaust radon from the radon chamber;

[0021] After completing the control of radon chamber radon concentration point 2, automatically determine whether to control radon chamber radon concentration point 3. If controlling radon chamber radon concentration point 3, enter the control process of concentration point 3. If not controlling radon chamber radon concentration point 3, determine whether to exhaust radon from the radon chamber;

[0022] After completing the control of radon chamber radon concentration point 3, determine whether to exhaust radon from the radon chamber. When radon exhaust is required, open solenoid valve 4 and solenoid valve 10, and start electric pump 4 to enter the radon exhaust process. When radon exhaust is not required, set the radon storage flag for the radon chamber. The next time the radon chamber is opened, an automatic alarm will be prompted, and automatic entry into the corresponding concentration point control can be set.

[0023] According to a double-chamber radon detector calibration device provided by the present invention, it is characterized in that: the control of radon chamber radon concentration point 1, concentration point 2, and concentration point 3 specifically includes the following process: Open solenoid valve 1, solenoid valve 2, solenoid valve 3, manual valve 1, and manual valve 2, then start the flow-adjustable air pump, take a small amount of radon gas from the radon source mixing chamber into the main radon chamber, and then start the α energy spectrum measurement device inside the main radon chamber to quickly complete the preliminary measurement of the radon concentration in the radon chamber. Calculate the radon supplementation amount based on the measurement value, continue to extract an appropriate amount of radon gas from the mixing chamber into the main radon chamber according to the radon supplementation amount, and restart the α energy spectrum measurement device inside the main radon chamber for rapid measurement and rapid monitoring. Every 1 hour, complete a micro-radon supplementation control to achieve the purpose of controlling the radon concentration at the corresponding radon concentration point in the radon chamber;

[0024] Among them, for intermittent micro-dose radon supplementation, the radon supplementation amount is calculated by the formula according to the radioactive decay characteristics of radon and the existing radon concentration in the radon chamber. Here, λ is the decay constant of radon, t is the decay time, N(0) is the radon concentration value in the radon chamber after radon supplementation at the previous radon supplementation point, and N(supplement) is the required radon supplementation amount. Open solenoid valve 1, solenoid valve 2, solenoid valve 3, manual valve 1 and manual valve 2, and adjust the flow rate of the adjustable air pump to take a small amount of radon gas from the radon source mixing chamber into the main radon chamber to compensate for the influence of radon gas decay in the main radon chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Appendix Figure 1 It is a block diagram of the system composition of a dual-chamber radon detector calibration device.

[0026] Appendix Figure 2 It is a composition and connection diagram of the radon chamber and its accessory structures in the dual-chamber radon detector calibration device.

[0027] Appendix Figure 3 It is a control flow chart of the dual-chamber radon detector calibration device and method.

[0028] Appendix Figure 4 It is a control flow chart of the radon concentration points in the main radon chamber of the dual-chamber radon detector calibration device. SPECIFIC EMBODIMENTS

[0029] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Appendix Figure 1 In this, the dual-chamber radon detector calibration device system includes a radon chamber and its accessory structures, a comprehensive controller, an environmental radon concentration monitoring device, a radon leakage voice control alarm device, a radon chamber computer management control system, a wall-mounted large-screen display system, and a mobile terminal software; a radon chamber multi-parameter monitoring system and a temperature and humidity control system are installed inside the radon chamber; the comprehensive controller is connected to the radon chamber multi-parameter monitoring system, the temperature and humidity control system, and the environmental radon concentration monitoring device through the RS485 bus; the control signal of the comprehensive controller is connected to the control components of the radon chamber and its accessory structures and the radon leakage voice control alarm device; the radon chamber computer management control system is connected to the comprehensive controller through the USB interface, connected to the wall-mounted large-screen display system through the HDMI interface, and connected to the mobile terminal software through the cloud network; the radon chamber computer management control system monitors the entire set of radon detector calibration device.

[0031] Appendix Figure 2Among them, the radon chamber and its auxiliary structures include the main radon chamber, the multi-parameter monitoring system 1 of the radon chamber, the auxiliary radon chamber, the multi-parameter monitoring system 2 of the radon chamber, the temperature and humidity controller, air pump 1, air pump 2, air pump 3, air pump 4, air pump 5, the air pump with adjustable flow rate, solenoid valve 1, solenoid valve 2, solenoid valve 3, solenoid valve 4, solenoid valve 5, solenoid valve 6, solenoid valve 7, solenoid valve 8, solenoid valve 9, solenoid valve 10, solenoid valve 11, manual valve 1, manual valve 2, manual valve 3, manual valve 4, fan 1, fan 2, fan 3, fan 4, fan 5, fan 6, activated carbon, 50L radon source mixing chamber, solid radon source, lead shielding chamber; among which the multi-parameter monitoring system 1 of the radon chamber is installed inside the main radon chamber and includes a temperature and humidity monitoring device, a pressure monitoring device, an alpha energy spectrum radon measuring device, and an ionization chamber-based radon concentration standard device; among which the multi-parameter monitoring system 2 of the radon chamber is installed inside the auxiliary radon chamber and includes a temperature and humidity monitoring device, a pressure monitoring device, and an ionization chamber-based radon concentration standard device; the temperature and humidity controller is installed inside the main radon chamber; the solid radon source is installed inside the lead shielding chamber, and the lead shielding chamber is placed inside the 50L radon source mixing chamber; the lead shielding body cavity is equipped with air pump 1 and air pump 2 for pumping radon into the radon source mixing chamber, one of the air pumps is in standby and one air pump is working; the 50L radon source mixing chamber is equipped with fan 1 and fan 2 for uniformly mixing the radon source, one of the fans is in standby and one fan is working; the radon source mixing chamber is connected to the main radon chamber through solenoid valve 1, solenoid valve 2, solenoid valve 3, manual valve 1, manual valve 2, the air pump with adjustable flow rate, and a flow meter to establish an air path circulation connection; the radon source mixing chamber is connected to the auxiliary radon chamber through solenoid valve 6, solenoid valve 7, manual valve 3, manual valve 4, and air pump 5 to establish an air path circulation connection; the main radon chamber is connected to the auxiliary radon chamber through solenoid valve 8, solenoid valve 9, and air pump 3 to establish an air path circulation connection; the main radon chamber is connected to the indoor atmosphere through solenoid valve 4, and is connected to the outdoor atmosphere through solenoid valve 10 and air pump 4 via activated carbon; the auxiliary radon chamber is connected to the indoor atmosphere through solenoid valve 5, and is connected to the outdoor atmosphere through solenoid valve 10 and air pump 4 via activated carbon;

[0032] Appendix Figure 3 Among them, the computer management and control system of the radon chamber monitors the entire set of radon detector calibration devices, and the specific control work process for the main radon chamber is as follows:

[0033] Open the radon chamber, confirm that the manual valve is open, start the radon chamber after setting the parameters; check whether the radon chamber leaks. If it leaks, an air leakage alarm will be issued. Check the airtightness and dispose of it, and then re-check whether the radon chamber leaks until the detection passes;

[0034] After the air leakage detection passes, detect whether radon chamber temperature and humidity control is required. If temperature and humidity control is required, perform temperature control until the set temperature and humidity point is reached, and then start the concentration point 1 control. If temperature and humidity control is not required, directly start the concentration point 1 control, maintain the corresponding duration at the radon concentration point 1, and perform intermittent micro-dose radon supplementation every 1 hour to keep the radon concentration in the radon chamber constant;

[0035] After the radon concentration at point 1 in the radon chamber is controlled, it is automatically determined whether to control the radon concentration at point 2 in the radon chamber. If the radon concentration at point 2 in the radon chamber is to be controlled, the control process for the radon concentration at point 2 is entered. If the radon concentration at point 2 in the radon chamber is not to be controlled, it is determined whether to exhaust radon from the radon chamber.

[0036] After the radon concentration at point 2 in the radon chamber is controlled, it is automatically determined whether to control the radon concentration at point 3 in the radon chamber. If the radon concentration at point 3 in the radon chamber is to be controlled, the control process for the radon concentration at point 3 is entered. If the radon concentration at point 3 in the radon chamber is not to be controlled, it is determined whether to exhaust radon from the radon chamber.

[0037] After the radon concentration at point 3 in the radon chamber is controlled, it is determined whether to exhaust radon from the radon chamber. When radon exhaust is required, solenoid valve 4 and solenoid valve 10 are opened, and electric pump 4 is started to enter the radon exhaust process. When radon exhaust is not required, the radon storage flag of the radon chamber is set, and an automatic alarm will be prompted when the radon chamber is opened next time. Automatic entry into the control of the corresponding concentration point can be set.

[0038] Appendix Figure 4 Among them, the control of the radon concentration at point 1, point 2, and point 3 in the radon chamber is as follows: Solenoid valve 1, solenoid valve 2, solenoid valve 3, manual valve 1, and manual valve 2 are opened, and then the flow-adjustable air pump is started. A small amount of radon gas is taken from the radon source mixing chamber into the main radon chamber. Then, the α-energy spectrum measuring device inside the main radon chamber is started to quickly complete the preliminary measurement of the radon concentration in the radon chamber. The radon supplementation amount is calculated based on the measurement value. According to the radon supplementation amount, an appropriate amount of radon gas is continuously extracted from the mixing chamber into the main radon chamber, and the α-energy spectrum measuring device inside the main radon chamber is restarted for rapid measurement and rapid monitoring. Every 1 hour, a trace radon supplementation control is completed to achieve the purpose of controlling the radon concentration at the corresponding point in the radon chamber.

[0039] Among them, for intermittent trace radon supplementation, according to the radioactive decay characteristics of radon and the existing radon concentration in the radon chamber, the radon supplementation amount is calculated by the formula, where λ is the decay constant of radon, t is the decay time, N(0) is the radon concentration value in the radon chamber after radon supplementation at the previous radon supplementation point, and N(supplement) is the required radon supplementation amount. Solenoid valve 1, solenoid valve 2, solenoid valve 3, manual valve 1, and manual valve 2 are opened, the flow of the adjustable air pump is adjusted, and a small amount of radon gas is taken from the radon source mixing chamber into the main radon chamber to compensate for the influence of radon gas decay in the main radon chamber.

[0040] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches can be made. These various improvements and retouches that can be made without creative labor should also be regarded as the protection scope of the present invention.

Claims

1. A double-chamber radon detector calibration device, characterized in that: it includes a radon chamber and its accessory structure, a comprehensive controller, an environmental radon concentration monitoring device, a radon leakage sound-controlled alarm device, a radon chamber computer management control system, a wall-mounted large-screen display system, and a mobile phone terminal software; a radon chamber multi-parameter monitoring system and a temperature and humidity control system are installed inside the radon chamber; the comprehensive controller is connected to the radon chamber multi-parameter monitoring system, the temperature and humidity control system, and the environmental radon concentration monitoring device through the RS485 bus; the comprehensive controller's control signal is connected to the control components of the radon chamber and its accessory structure and the radon leakage sound-controlled alarm device; the radon chamber computer management control system is connected to the comprehensive controller through the USB interface, connected to the wall-mounted large-screen display system through the HDMI interface, and connected to the mobile phone terminal software through the cloud network; the radon chamber computer management control system monitors the entire set of radon detector calibration device; the radon chamber and its accessory structure include a main radon chamber, a radon chamber multi-parameter monitoring system 1, a secondary radon chamber, a radon chamber multi-parameter monitoring system 2, a temperature and humidity controller, air pump 1, air pump 2, air pump 3, air pump 4, air pump 5, a flow-adjustable air pump, solenoid valve 1, solenoid valve 2, solenoid valve 3, solenoid valve 4, solenoid valve 5, solenoid valve 6, solenoid valve 7, solenoid valve 8, solenoid valve 9, solenoid valve 10, solenoid valve 11, manual valve 1, manual valve 2, manual valve 3, manual valve 4, fan 1, fan 2, fan 3, fan 4, fan 5, fan 6, activated carbon, a 50L radon source mixing chamber, a solid radon source, and a lead shielding chamber; wherein the radon chamber multi-parameter monitoring system 1 is installed inside the main radon chamber and includes a temperature and humidity monitoring device, a pressure monitoring device, an α energy spectrum radon measurement device, and an ionization chamber-based radon concentration standard; the radon chamber multi-parameter monitoring system 2 is installed inside the secondary radon chamber and includes a temperature and humidity monitoring device, a pressure monitoring device, and an ionization chamber-based radon concentration standard; the temperature and humidity controller is installed inside the main radon chamber; the solid radon source is installed inside the lead shielding chamber, and the lead shielding chamber is placed inside the 50L radon source mixing chamber; the lead shielding chamber cavity is equipped with electric pump 1 and electric pump 2 for pumping radon into the radon source mixing chamber, with one electric pump in reserve and one electric pump working; the 50L radon source mixing chamber is equipped with fan 1 and fan 2 for evenly mixing the radon source, with one fan in reserve and one fan working; the radon source mixing chamber is connected to the main radon chamber through solenoid valve 1, solenoid valve 2, solenoid valve 3, manual valve 1, manual valve 2, the flow-adjustable air pump, and the flowmeter to establish an air path circulation connection; the radon source mixing chamber is connected to the secondary radon chamber through solenoid valve 6, solenoid valve 7, manual valve 3, manual valve 4, and air pump 5 to establish an air path circulation connection; the main radon chamber is connected to the secondary radon chamber through solenoid valve 8, solenoid valve 9, and air pump 3 to establish an air path circulation connection; the main radon chamber is connected to the indoor atmosphere through solenoid valve 4, and connected to the outdoor atmosphere through solenoid valve 10, air pump 4, and activated carbon; the secondary radon chamber is connected to the indoor atmosphere through solenoid valve 5, and connected to the outdoor atmosphere through solenoid valve 10, air pump 4, and activated carbon; for the mobile phone terminal software, install the radon chamber operation software on the mobile phone terminal, and through the network cloud platform, connect to the radon chamber computer management control system, and can remotely monitor and control the working status of the radon chamber.

2. A radon-measuring instrument calibration device with a double-chamber, as described in claim 1, characterized in that: The comprehensive controller includes four parts: a control circuit, a drive circuit, a parameter management circuit, and an interface circuit. The interface circuit receives the instruction signals from the radon chamber computer management control system, sends control signals by the control circuit, and drives the control signals by the drive circuit to control the solenoid valve and the air pump to perform corresponding operations. The interface circuit also receives the instruction signals from the radon chamber computer management control system to read the main radon chamber temperature and humidity monitoring parameters, pressure monitoring parameters, alpha energy spectrum radon measurement information, radon measurement information based on the ionization chamber radon concentration standard, and read the secondary radon chamber temperature and humidity monitoring parameters, pressure monitoring parameters, and radon measurement information based on the ionization chamber radon concentration standard.

3. A radon-measuring instrument calibration device with a double-chamber, as described in claim 1, characterized in that: The environmental radon concentration monitoring device is an ionization chamber radon-measuring instrument with an RS485 interface, installed at a position of 0.8 m to 1.5 m in the indoor environment air where the radon chamber is located, for real-time monitoring of the air radon concentration in the environment. The wall-mounted large-screen display system is a liquid crystal display installed on the wall, which is a display device for real-time large-screen display of the control status of the radon chamber and monitoring parameters.

4. A radon-measuring instrument calibration device with a double-chamber, as described in claim 1, characterized in that: The radon leakage sound-controlled alarm device includes a speaker, a warning light, a drive power supply, and a control interface. The radon chamber computer management control system reads the radon monitoring data of the environmental radon concentration monitoring device through the comprehensive controller. When it is judged that the value exceeds the warning value, it sends a warning instruction to the comprehensive controller. After receiving the warning instruction, the comprehensive controller controls the speaker and the warning light of the radon leakage sound-controlled alarm device through the control interface and the drive power supply.

5. A radon-measuring instrument calibration device with a double-chamber, as described in claim 1, characterized in that: The radon chamber computer management control system includes a computer, a display interface, control software, and a radon chamber parameter monitoring database. Among them, the control software executes the radon chamber control process, the display interface displays the control status of the radon chamber and the monitoring data, and the radon chamber parameter monitoring database stores the historical data of the temperature, humidity, air pressure, and radon concentration monitored in the radon chamber. The computer is connected to the workbench display and the wall-mounted large-screen display system at the same time.

6. A radon-measuring instrument calibration device with a double-chamber, as described in claim 1, characterized in that: The secondary radon chamber is respectively connected to the main radon chamber and the radon source mixing chamber, obtains radon from the main radon chamber through a manual control method, detects the internal radon concentration through a standard device. When the radon concentration reaches the expected radon concentration target, the valve is closed to seal the radon chamber, so that it can maintain a relatively stable radon concentration level for a long time. Radon is supplemented from the radon source mixing chamber to the inside of the mixing chamber manually, so that it can be maintained at the corresponding radon concentration level for a long time.

7. A radon-measuring instrument calibration device with a double-chamber, as described in claim 1, characterized in that: The radon chamber computer management control system monitors the entire set of radon-measuring instrument calibration device. The specific control work process for the main radon chamber is: Open the radon chamber, ensure that the manual valve is open, start the radon chamber after setting the parameters; Check whether the radon chamber leaks. If it leaks, an air leakage alarm will be issued. Check the airtightness and dispose of it, then re-check whether the radon chamber leaks until the detection passes; After the air leakage detection passes, check whether radon chamber temperature and humidity control is required. If temperature and humidity control is required, perform temperature control until the set temperature and humidity points are reached, then start the control of concentration point 1. If temperature and humidity control is not required, directly start the control of concentration point 1, maintain for the corresponding duration at radon concentration point 1, and perform intermittent micro-radon supplementation every 1 hour to keep the radon concentration in the radon chamber constant; After completing the control of radon concentration point 1 in the radon chamber, automatically determine whether to control radon concentration point 2 in the radon chamber. If the control of radon concentration point 2 in the radon chamber is to be carried out, enter the control process of radon concentration point 2. If the control of radon concentration point 2 in the radon chamber is not to be carried out, determine whether to exhaust radon from the radon chamber; After completing the control of radon concentration point 2 in the radon chamber, automatically determine whether to control radon concentration point 3 in the radon chamber. If the control of radon concentration point 3 in the radon chamber is to be carried out, enter the control process of radon concentration point 3. If the control of radon concentration point 3 in the radon chamber is not to be carried out, determine whether to exhaust radon from the radon chamber; After completing the control of radon concentration point 3 in the radon chamber, determine whether to exhaust radon from the radon chamber. When radon exhaust is required, open solenoid valve 4 and solenoid valve 10, and start electric pump 4 to enter the radon exhaust process. When radon exhaust is not required, set the radon storage flag in the radon chamber, and an automatic alarm will be prompted when the radon chamber is opened next time. Automatic entry into the corresponding concentration point control can be set.

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