Device suitable for measuring background value of radon concentration measuring instrument

Abstract

The embodiment of the utility model relates to the field of radiation environment monitoring, in particular to a device suitable for measuring the background value of a radon concentration measuring instrument, which comprises a container, a vacuumizing interface, a nitrogen inlet interface, a nitrogen outlet interface and a nitrogen concentration measuring piece. The container forms an accommodating cavity for accommodating nitrogen; the vacuumizing interface is used for vacuumizing the accommodating cavity; the nitrogen inlet connector is in fluid communication with the containing cavity and used for allowing high-purity nitrogen to enter the containing cavity; the nitrogen outlet connector is in fluid communication with the containing cavity and used for discharging gas in the containing cavity outwards, and the nitrogen outlet connector is further connected with a gas inlet of the radon concentration measuring instrument; the nitrogen concentration measuring part is used for measuring the concentration of nitrogen in the containing cavity so as to determine that the gas in the containing cavity can be used for measuring the background value of the radon concentration measuring instrument. The device provided by the embodiment of the utility model is beneficial to improving the accuracy of the background value measured by the radon concentration measuring instrument.

Description

Technical Field

[0001] The embodiments of this application relate to the field of radiation environment monitoring, and specifically to a device suitable for measuring the background value of a radon concentration meter. Background Technology

[0002] The statements herein are provided merely as background information in connection with this application and do not necessarily constitute prior art.

[0003] Radon, as a radioactive inert gas, poses a potential hazard to human health. Therefore, before long-term operations, radon concentration meters are typically used to measure the radon concentration in the work environment.

[0004] To ensure the accuracy of radon concentration measurements by radon concentration meters, it is necessary to accurately determine the background value of the radon concentration meter. However, the current technology for measuring the background value of radon concentration meters still has many limitations. Utility Model Content

[0005] A brief overview of this application is provided below to offer a basic understanding of certain aspects thereof. It should be understood that this overview is not an exhaustive summary of the application. It is not intended to identify key or essential parts of the application, nor is it intended to limit its scope. Its purpose is merely to present certain concepts in a simplified form as a prelude to the more detailed description that follows.

[0006] Embodiments of this application provide an apparatus suitable for measuring the background value of a radon concentration measuring instrument, comprising a container, a vacuum port, a nitrogen inlet port, a nitrogen outlet port, and a nitrogen concentration measuring element. The container forms a cavity for containing nitrogen; the vacuum port is in fluid communication with the cavity for evacuating the cavity; the nitrogen inlet port is in fluid communication with the cavity for supplying high-purity nitrogen into the cavity; the nitrogen outlet port is in fluid communication with the cavity for discharging the gas from the cavity, and the nitrogen outlet port is also connected to the inlet of the radon concentration measuring instrument; the nitrogen concentration measuring element measures the concentration of nitrogen in the cavity to determine whether the gas in the cavity is suitable for measuring the background value of the radon concentration measuring instrument.

[0007] Furthermore, the nitrogen concentration measuring device is located at the bottom of the container.

[0008] Furthermore, the nitrogen inlet is located at the top of the container.

[0009] Furthermore, the nitrogen outlet is located at the top of the container.

[0010] Furthermore, the device suitable for measuring the background value of the radon concentration measuring instrument also includes a pressure measuring element for measuring the gas pressure of the containment cavity, so that the nitrogen concentration measuring element measures the nitrogen concentration in the containment cavity at a preset gas pressure.

[0011] Furthermore, the device suitable for measuring the background value of the radon concentration meter also includes a three-way structure and a pressure relief valve. The three-way structure includes three interconnected ports: a first port, a second port, and a third port. The first port is connected to the nitrogen outlet, the second port is connected to the inlet of the radon concentration meter, and the pressure relief valve is connected to the third port of the three-way structure to automatically relieve pressure in the containment chamber when the pressure in the containment chamber exceeds a preset value.

[0012] Furthermore, the device suitable for measuring the background value of the radon concentration meter also includes a decompression valve, which is located between the second port of the three-way structure and the air inlet of the radon concentration meter, and is used to control the flow rate of high-purity nitrogen from the second port into the air inlet of the radon concentration meter.

[0013] Furthermore, the decompression valve includes a built-in pressure measuring element for measuring the pressure of the high-purity nitrogen flowing out from the second port, so as to measure the background value of the radon concentration measuring instrument after the pressure stabilizes.

[0014] Furthermore, the device suitable for measuring the background value of radon concentration measuring instruments also includes an insulation layer disposed on the outer surface of the container to insulate the containment cavity.

[0015] Furthermore, the device suitable for measuring the background value of radon concentration measuring instruments also includes a protective housing, with the container and nitrogen concentration measuring element both located within the protective housing.

[0016] The apparatus provided in this application for measuring the background value of a radon concentration meter uses a vacuum port to evacuate the containment cavity, removing most of the impurity gases. High-purity nitrogen is introduced into the containment cavity through a nitrogen inlet port, and the nitrogen concentration in the containment cavity is measured by a nitrogen concentration measuring device. When the nitrogen concentration in the containment cavity is below a threshold, the nitrogen is discharged, and high-purity nitrogen is introduced back into the containment cavity through the nitrogen inlet port. This eliminates interference from other gases (such as air and water vapor) in the containment cavity, allowing the nitrogen concentration in the containment cavity to reach a higher level. The nitrogen in the containment cavity is then used to measure the background value of the radon concentration meter. Since the higher concentration of nitrogen in the containment cavity contains almost no radon, this improves the accuracy of the background value measured by the radon concentration meter. Attached Figure Description

[0017] Other objects and advantages of this application will become apparent from the following description of embodiments of this application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of this application.

[0018] Figure 1 This is a schematic diagram of the structure of a device for measuring the background value of a radon concentration measuring instrument provided in an embodiment of this application;

[0019] Figure 2 yes Figure 1 A front view schematic diagram of a device suitable for measuring the background value of a radon concentration measuring instrument;

[0020] Figure 3 yes Figure 1 The diagram shown is an exploded view of a device suitable for measuring the background value of a radon concentration meter.

[0021] Explanation of reference numerals in the attached figures:

[0022] 100. Background value measuring device;

[0023] 1. Container; 110. Receiving cavity; 101. Vacuuming port; 102. Nitrogen inlet port; 103. Nitrogen outlet port; 104. Pressure measurement port; 105. Concentration measurement port; 106. Support component;

[0024] 2. Nitrogen concentration measuring device; 21. Concentration measuring probe;

[0025] 3. Pressure measuring components; 301. Pressure measuring connectors;

[0026] 4. Three-way structure; 401, First port; 402, Second port; 403, Third port; 5. Pressure relief valve;

[0027] 6. Vacuum connection assembly; 61. First vacuum connection piece; 62. Vacuum valve; 63. Second vacuum connection piece;

[0028] 7. Intake valve; 701. Intake connector;

[0029] 8. Decompression valve; 801. Decompression connector;

[0030] 9. Concentration measurement connection assembly; 91. First adapter; 92. Second adapter; 93. Third adapter.

[0031] It should be noted that the accompanying drawings are not necessarily drawn to scale, but are shown only in a schematic manner without affecting the reader's understanding. Detailed Implementation

[0032] Exemplary embodiments of this application will be described below with reference to the accompanying drawings. For clarity and brevity, not all features of actual implementations are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the development of any such actual embodiment to achieve the developer's specific goals, such as complying with constraints related to the system and business, and these constraints may vary depending on the implementation. Furthermore, it should be understood that while development work can be very complex and time-consuming, such development work is merely a routine task for those skilled in the art who benefit from the content of this application.

[0033] It should also be noted that, in order to avoid obscuring this application with unnecessary details, only the equipment structure and / or processing steps closely related to the solution according to this application are shown in the accompanying drawings, while other details that are not closely related to this application are omitted.

[0034] In related technologies, nitrogen is used to measure the background value of radon concentration measuring instruments. However, when measuring the background value of radon concentration measuring instruments, there are situations where the purity of the gas used for measurement is insufficient or other gases are mixed in with the gas used for measurement, resulting in inaccurate background values.

[0035] To address the aforementioned issues, embodiments of this application provide a device suitable for measuring the background value of a radon concentration meter (hereinafter referred to as a background value measuring device).

[0036] See Figures 1 to 3 , Figures 1 to 3 The diagrams show a schematic diagram, a front view, and an exploded view of the background value measuring device 100 provided in the embodiments of this application. The background value measuring device 100 may include a container 1, a vacuum port 101, a nitrogen inlet port 102, a nitrogen outlet port 103, and a nitrogen concentration measuring element 2. The container 1 forms a cavity 110 for containing nitrogen; the vacuum port 101 is in fluid communication with the cavity 110 and is used to evacuate the cavity 110; the nitrogen inlet port 102 is in fluid communication with the cavity 110 and is used to allow high-purity nitrogen to enter the cavity 110; the nitrogen outlet port 103 is in fluid communication with the cavity 110 and is used to allow the gas in the cavity 110 to be discharged outwards, and the nitrogen outlet port 103 is also used to connect to the inlet of a radon concentration measuring instrument; the nitrogen concentration measuring element 2 is used to measure the concentration of nitrogen in the cavity 110 to determine whether the gas in the cavity 110 can be used to measure the background value of the radon concentration measuring instrument.

[0037] The background value measuring device 100 provided in the embodiments of this application can remove most of the impurity gases in the containment cavity 110 by setting a vacuum port 101 to evacuate the containment cavity 110. Then, high-purity nitrogen is introduced into the containment cavity 110 through the nitrogen inlet port 102, and the nitrogen concentration in the containment cavity 110 is measured by the nitrogen concentration measuring element 2. When the nitrogen concentration in the containment cavity 110 is lower than the threshold, the nitrogen in the containment cavity 110 can be discharged, and then high-purity nitrogen is introduced into the containment cavity 110 through the nitrogen inlet port 102. This can eliminate the interference of other gases (such as air and water vapor) in the containment cavity 110 on the nitrogen concentration, so that the nitrogen concentration in the containment cavity 110 reaches a high concentration. Then, the nitrogen in the containment cavity 110 is used to measure the background value of the radon concentration measuring instrument. Since the high concentration of nitrogen in the containment cavity 110 contains almost no radon, it is beneficial to improve the accuracy of the background value measured by the radon concentration measuring instrument.

[0038] Since the nitrogen gas in the containment chamber 110 contains almost no radon, when nitrogen gas is supplied to the inlet of the radon concentration meter in the environment to be measured using the background value measuring device 100 of this application, the radon concentration value measured by the radon concentration meter is the background value of the radon concentration meter in the measurement environment. After measuring the radon concentration in the environment to be measured using the radon concentration meter, the actual radon concentration in the environment to be measured is obtained by subtracting the background value of radon in the environment to be measured from the measured value.

[0039] High-purity nitrogen can be continuously supplied to the receiving cavity 110 through the nitrogen inlet port 102 via the nitrogen storage tank.

[0040] In some environments where radon concentration needs to be measured, it is inconvenient to carry a nitrogen storage tank into the environment. Therefore, after the nitrogen concentration in the containment cavity 110 is measured by the nitrogen concentration measuring device 2 and reaches the threshold, high-purity nitrogen can be continuously introduced into the containment cavity 110 through the nitrogen inlet port 102, thereby storing the high-purity nitrogen in the containment cavity 110. This makes it convenient to carry the background value measuring device 100 to the environment to be measured, and to use the high-purity nitrogen in the containment cavity 110 to measure the background value of the radon concentration measuring instrument in the measurement environment.

[0041] In some embodiments, the nitrogen pressure in the containment cavity 110 is greater than atmospheric pressure, so that the nitrogen in the containment cavity 110 flows into the radon concentration measuring instrument under the action of the pressure difference.

[0042] In some embodiments, the high-purity nitrogen gas can be nitrogen gas with a concentration of 99% or higher. Accordingly, the preset concentration can be 99% to ensure that there are almost no other gases in the nitrogen gas, thereby effectively eliminating interference from other gases on the measurement of the background value of the radon concentration measuring instrument. Compared with the background value measured in related technologies, the measurement error of the radon concentration measured by the background value measuring device 100 provided in the embodiments of this application is within 1%.

[0043] When the nitrogen concentration in the containment chamber 110 decreases due to various reasons (such as gas leakage or mixing with other gases), the accuracy of the background value measured by the radon concentration meter will be affected. In some embodiments, during the measurement of the background value of the radon concentration meter, the nitrogen concentration in the containment chamber 110 can be measured using the nitrogen concentration measuring element 2 to ensure that the nitrogen concentration in the containment chamber 110 is always maintained at a preset concentration, which helps to ensure the accuracy of the background value measured by the radon concentration meter.

[0044] In some embodiments, the nitrogen concentration measuring element 2 can be a nitrogen concentration sensor. The measurement accuracy of the nitrogen concentration measuring element 2 can be ±0.6% VOL to ensure the accuracy of nitrogen concentration monitoring.

[0045] See Figure 2 In some embodiments, the nitrogen concentration measuring device 2 is disposed at the bottom of the container 1. Since the density of nitrogen is slightly less than that of air, when a small amount of air is present in the containing cavity 110, this air is located below the containing cavity 110. That is, the area with a relatively high nitrogen concentration is in the upper part of the containing cavity 110, and the area with a relatively low nitrogen concentration is in the lower part of the containing cavity 110. By placing the nitrogen concentration measuring device 2 at the bottom of the container 1, the embodiments of this application make it easier to make the nitrogen concentration in the containing cavity 110 measured by the nitrogen concentration measuring device 2 less than the actual concentration in the containing cavity 110. That is, the nitrogen concentration measured by the nitrogen concentration measuring device 2 is more conservative, so as to ensure that the nitrogen concentration in the containing cavity 110 meets the measurement requirements.

[0046] In some embodiments, the background value measuring device 100 may further include a concentration measuring interface 105, through which the nitrogen concentration measuring element 2 communicates with the containment cavity 110 to measure the nitrogen concentration within the containment cavity 110. The concentration measuring interface 105 is connected to the container 1 at the bottom of the container 1.

[0047] In some embodiments, the background value measuring device 100 may further include a concentration measuring connection component 9, and the nitrogen concentration measuring device 2 includes a concentration measuring probe 21, which is connected to the concentration measuring interface 105 via the concentration measuring connection component 9.

[0048] In some embodiments, the concentration measurement connection assembly 9 includes a first adapter 91, a second adapter 92, and a third adapter 93. The two ends of the first adapter 91 are connected to the concentration measurement interface 105 and the second adapter 92, respectively. The two ends of the third adapter 93 are connected to the concentration measurement probe 21 and the second adapter 92, respectively, thereby ensuring the airtight connection between the concentration measurement probe 21 and the concentration measurement interface 105. The first adapter 91 can be an adapter, and the third adapter 93 can be a wire coupling.

[0049] See Figure 2 In some embodiments, the nitrogen inlet 102 is located at the top of the container 1. Because the nitrogen inlet 102 is located at the top of the container 1, the nitrogen entering the receiving cavity 110 through the nitrogen inlet 102 tends to remain in the upper part of the receiving cavity 110, thereby causing the residual air components in the receiving cavity 110 to move downwards. This is beneficial for the nitrogen concentration in the receiving cavity 110 measured by the nitrogen concentration measuring device 2 to be lower than the actual concentration in the receiving cavity 110.

[0050] In some embodiments, the nitrogen outlet 103 is located at the top of the container 1, which facilitates the connection of the valves at the nitrogen outlet 103 and the observation and adjustment of the valves.

[0051] In some embodiments, nitrogen inlet 102 and nitrogen outlet 103 are spaced apart on the top of container 1 to facilitate pipeline connection.

[0052] See Figure 1 In some embodiments, the background value measuring device 100 may further include an inlet connector 701 and an inlet valve 7, the inlet valve 7 being used to control the opening and closing of the nitrogen inlet port 102. The two ends of the inlet valve 7 are connected to the nitrogen inlet port 102 and the inlet connector 701, respectively. The inlet connector 701 is used to connect to an external high-purity nitrogen inlet pipeline, so that the nitrogen storage tank can supply high-purity nitrogen to the receiving cavity 110 through the high-purity nitrogen inlet pipeline. This arrangement facilitates ensuring the sealing of the receiving cavity 110 by means of the inlet valve 7 after the high-purity nitrogen inlet pipeline is disconnected from the inlet connector 701.

[0053] In some embodiments, the nitrogen inlet port 102 can be a quick-connect port to facilitate quick connection between the inlet valve 7 and the nitrogen inlet port 102.

[0054] In some embodiments, seals are provided at the connection points of the nitrogen inlet port 102 and the inlet valve 7, the connection points of the inlet valve 7 and the inlet connector 701, and the connection points of the inlet connector 701 and the high-purity nitrogen inlet pipeline to prevent nitrogen leakage and the entry of external gases, thereby ensuring the purity of the nitrogen. The seals are, for example, rubber gaskets with good sealing performance.

[0055] See Figure 1 In some embodiments, the background value measuring device 100 may further include a three-way structure 4 and a pressure relief valve 5. The three-way structure 4 includes three interconnected first ports 401, second ports 402 and third ports 403, wherein the first port 401 is connected to the nitrogen outlet interface 103, the second port 402 is used to connect to the inlet of the radon concentration measuring instrument, and the pressure relief valve 5 is connected to the third port 403 of the three-way structure 4 to automatically relieve pressure in the receiving cavity 110 when the pressure in the receiving cavity 110 is higher than a preset value. In this embodiment, by providing a three-way structure 4 to facilitate the flow of nitrogen, the nitrogen in container 1 can be delivered to the radon concentration measuring instrument to provide the gas required for measuring the background value. At the same time, by providing a pressure relief valve 5 to relieve pressure in the containment cavity 110, when the pressure in container 1 exceeds the preset value due to various reasons (such as temperature changes, excessive nitrogen filling, etc.), the additional pressure in the containment cavity 110 is released, thereby protecting container 1 and the entire background value measuring device 100 and preventing safety accidents caused by excessive pressure in the containment cavity 110.

[0056] For example, the opening pressure of the pressure relief valve 5 can be 1.0 MPa, that is, when the pressure in the receiving cavity 110 exceeds 1.0 MPa, the pressure relief valve 5 will automatically release pressure.

[0057] In some embodiments, the background value measuring device 100 may further include a decompression valve 8 disposed between the second port 402 of the three-way structure 4 and the inlet of the radon concentration measuring instrument, for controlling the flow rate of high-purity nitrogen from the second port 402 into the inlet of the radon concentration measuring instrument. In such an embodiment, by controlling the flow rate of high-purity nitrogen from the second port 402 into the inlet of the radon concentration measuring instrument through the decompression valve 8, the nitrogen in the container 1 can be stably delivered to the radon concentration measuring instrument.

[0058] In some embodiments, the background value measuring device 100 may further include a decompression connector 801, the two ends of which are respectively used to connect a decompression valve 8 and a hose connected to the air inlet of the radon concentration measuring instrument. The hose is, for example, a corrosion-resistant silicone hose.

[0059] In some embodiments, the decompression valve 8 includes a built-in pressure measuring element for measuring the pressure of the high-purity nitrogen gas flowing out from the second port 402, so as to measure the background value of the radon concentration measuring instrument after the pressure stabilizes. In such an embodiment, the above arrangement allows the radon concentration measuring instrument to measure the background value after the pressure stabilizes, which helps to improve the accuracy of the measured background value. The pressure measuring element built into the decompression valve 8 can also be a digital pressure gauge.

[0060] In some embodiments, the background value measuring device 100 may further include a valve for controlling the opening and closing of the second port 402. In such embodiments, the valve is provided to avoid affecting the pressure relief valve 5's function of relieving pressure in the receiving cavity 110, which helps to improve the safety of the background value measuring device 100.

[0061] In some embodiments, the background value measuring device 100 may further include a vacuum connection assembly 6 for connecting a vacuum pipeline to a vacuum interface 101, thereby enabling the vacuuming component to evacuate the receiving cavity 110 through the vacuum pipeline. In some embodiments, the vacuum connection assembly 6 may include a first vacuum connector 61, a vacuum valve 62, and a second vacuum connector 63; the two ends of the first vacuum connector 61 are respectively connected to the vacuum interface 101 and the vacuum valve 62, and the second vacuum connector 63 is used to connect the vacuum valve 62 and the vacuum pipeline. This arrangement facilitates the sealing of the receiving cavity 110 by means of the vacuum valve 62 after the vacuum pipeline is disconnected from the second vacuum connector 63.

[0062] See Figure 1 In some embodiments, the background value measuring device 100 further includes a pressure measuring element 3 for measuring the air pressure of the receiving cavity 110, so that the nitrogen concentration measuring element 2 measures the nitrogen concentration in the receiving cavity 110 under a preset air pressure.

[0063] The inventors of this application discovered that when the gas pressure inside the containment cavity 110 is different from that at atmospheric pressure, the nitrogen concentration measured by the nitrogen concentration measuring device 2 is different from that measured at room temperature and pressure. For example, when the gas pressure inside the containment cavity 110 is greater than that at atmospheric pressure, the nitrogen concentration measured by the nitrogen concentration measuring device 2 is lower than that measured at atmospheric pressure. Therefore, in the embodiments of this application, the pressure measuring device 3 enables the nitrogen concentration measuring device 2 to measure the nitrogen concentration in the containment cavity 110 at a preset gas pressure, so as to ensure that the nitrogen concentration measured by the nitrogen concentration measuring device 2 at the gas pressure inside the containment cavity 110 is the same as that measured at atmospheric pressure, thereby ensuring the accuracy of the nitrogen concentration measured by the nitrogen concentration measuring device 2, which is beneficial to ensuring the accuracy of the background value of the measured radon concentration measuring instrument.

[0064] In some embodiments, the preset pressure can be 0.2 MPa. In such embodiments, the preset pressure not only ensures that the air in the accommodating cavity 110 can be discharged outward through the nitrogen outlet 103 under the action of pressure difference, but also ensures that the nitrogen concentration measured by the nitrogen concentration measuring device 2 at this pressure is basically the same as the nitrogen concentration measured at normal pressure.

[0065] In some embodiments, the background value measuring device 100 may further include a pressure measuring interface 104, through which the pressure measuring element 3 communicates with the receiving cavity 110 to measure the air pressure of the receiving cavity 110.

[0066] The background value measuring device 100 may also include a pressure measuring connector 301, which connects the pressure measuring component 3 to the pressure measuring interface 104.

[0067] In some embodiments, the pressure measuring element 3 may have an accuracy of ±1.0 kPa to ensure the accuracy of pressure measurement.

[0068] In some embodiments, the pressure measuring element 3 is, for example, a digital pressure gauge. In such embodiments, the above-described configuration can display the air pressure in the receiving cavity 110 in real time and intuitively. The operator can observe the pressure value displayed by the pressure gauge to understand the air pressure status of the receiving cavity 110 in a timely manner, so as to adjust the air pressure in the receiving cavity 110.

[0069] Specifically, the methods for adjusting the gas pressure in the receiving cavity 110 include: when the gas pressure in the receiving cavity 110 is high, the gas in the receiving cavity 110 can be slowly discharged by slowly opening the valve at the nitrogen outlet 103, thereby reducing the gas pressure in the receiving cavity 110; when the gas pressure in the receiving cavity 110 is low, nitrogen can be added to the receiving cavity 110 through the nitrogen inlet 102, thereby increasing the gas pressure in the receiving cavity 110.

[0070] See Figure 1 In some embodiments, the pressure measuring element 3 and the vacuum port 101 are disposed on opposite sides of the container 1 along the axial direction.

[0071] In some embodiments, the background value measuring device 100 may further include a thermal insulation layer disposed on the outer surface of the container 1 for insulating the containment cavity 110. Changes in ambient temperature can cause changes in nitrogen concentration. The embodiments of this application use a thermal insulation layer to insulate the containment cavity 110, which prevents changes in the nitrogen temperature within the containment cavity 110 due to temperature variations in the test environment when the background value measuring device 100 is transported to the test environment. This avoids changes in the nitrogen concentration within the containment cavity 110, thus ensuring the accuracy of the measured radon concentration measurement's background value. The thermal insulation layer may be, for example, made of rubber-plastic sponge.

[0072] In some embodiments, the volume of container 1 can be 20L. Since the measurement of the background value of the radon concentration measuring instrument requires a large amount of nitrogen, the above configuration ensures that container 1 can provide sufficient nitrogen to the radon concentration measuring instrument. In some embodiments, the material of container 1 can be 304 stainless steel. Since 304 stainless steel has the characteristic of withstanding a pressure of 1.25MPa, the above configuration can ensure the safety and durability of container 1.

[0073] In some embodiments, the axial direction of container 1 is parallel to the horizontal plane. In some embodiments, the background value measuring device 100 further includes a support member 106 disposed at the bottom of container 1 to support container 1, thereby facilitating the arrangement of nitrogen concentration measuring device 2.

[0074] In some embodiments, the background value measuring device 100 may further include a protective housing, with the container 1, the nitrogen concentration measuring element 2, and the support 106 all located within the protective housing. This facilitates carrying the background value measuring device 100 to the environment to be measured via the protective housing.

[0075] See Figure 1 In some embodiments, the background value measuring device 100 may further include a vacuum evacuation component configured to evacuate the receiving cavity 110. The vacuum evacuation component may be, for example, a vacuum pump.

[0076] In some embodiments, the evacuation rate of the vacuum pumping component to the receiving cavity 110 can be determined according to the volume of the container 1 and the actual working efficiency requirements, so that the vacuum pumping component can complete the vacuuming operation within a preset time and improve the measurement efficiency. For example, the volume of the container 1 can be 20L, the preset time can be 20min, and in this case, the evacuation rate of the vacuum pumping component can be 1.1L / min.

[0077] In some embodiments, the background value measuring device 100 may further include a control unit electrically connected to the pressure measuring element 3, the vacuuming element, the nitrogen concentration measuring element 2, the inlet valve 7 at the nitrogen inlet port 102, and the valve at the nitrogen outlet port 103, for controlling the start and stop of the vacuum pump according to the pressure measured by the pressure measuring element 3, and controlling the opening and closing of the nitrogen inlet port 102 and the nitrogen outlet port 103 according to the nitrogen concentration measured by the nitrogen concentration measuring element 2.

[0078] In some embodiments, when the nitrogen concentration in the containment cavity 110 decreases, the radon concentration measuring device can transmit monitoring information to the operator or relevant control unit so that appropriate measures can be taken to adjust the nitrogen concentration in the containment cavity 110. Appropriate measures may include replenishing the containment with high-purity nitrogen or checking the seal of container 1.

[0079] In some embodiments, when the background value measuring device 100 is used in the environment to be tested, the cavity 110 is filled with nitrogen gas that can be used to measure the background value of the radon concentration measuring instrument. During the measurement, the nitrogen gas outlet 103 can be directly connected to the air inlet of the radon concentration measuring instrument.

[0080] In some embodiments, the background value measuring device 100 can be maintained periodically to ensure stable performance and long-term reliable operation. Specific maintenance operations include: for the digital pressure gauge 3, it can be calibrated periodically using a standard pressure source to ensure the accuracy of the pressure measured; for the vacuum pump, the vacuum pump oil can be changed periodically, and the seals of the vacuum pump can be checked for wear and replaced promptly; for the nitrogen concentration sensor 2, it can be calibrated and cleaned periodically according to its instruction manual to maintain the measurement accuracy and sensitivity of the nitrogen concentration sensor 2, thereby ensuring the accuracy of the nitrogen concentration measured by the nitrogen concentration sensor 2; for the container 1, the appearance of the container 1 can be checked for corrosion or scratches, and anti-corrosion treatment can be applied to the container 1 if necessary; in addition, the connections of various components of the background value measuring device 100 can be checked periodically for looseness, and any loose parts can be tightened promptly.

[0081] In some embodiments, when measuring the background value of a radon concentration meter using the background value measuring device 100, the background value measuring device 100 needs to be checked first. Specific checks include: carefully inspecting the appearance of the container 1 to ensure there is no damage or deformation; closing the nitrogen inlet port 102 and the nitrogen outlet port 103, and tightly connecting the vacuum valve 62 to the vacuum port 101 to ensure a good seal and no risk of gas leakage; checking whether the digital pressure gauge 3 can display values ​​normally, which can be confirmed by pressing the test button or observing its self-test program; checking whether the power cord connection of the vacuum pump is secure, starting the vacuum pump, and observing its operating status to ensure smooth operation without abnormal noise; checking whether the connection line of the nitrogen concentration sensor 2 is normal, which can be done using the calibration function built into the nitrogen concentration sensor 2 or by using a standard gas to ensure that the nitrogen concentration sensor 2 can accurately measure the nitrogen concentration; simultaneously, manually operating the pressure relief valve 5 to check the valve core flexibility and ensure that the pressure relief valve 5 can work normally when necessary.

[0082] In use, after evacuating the containment cavity 110 through the vacuum port 101, close the vacuum port 101 and open the nitrogen inlet port 102 to supply high-purity nitrogen into the containment cavity 110. When the nitrogen concentration measured by the nitrogen concentration measuring device 2 reaches the preset concentration, the gas in the containment cavity 110 can be used to measure the background value of the radon concentration measuring instrument. At this time, the nitrogen outlet port 103 can be connected to the inlet of the radon concentration measuring instrument so that the nitrogen in the containment cavity 110 flows into the radon concentration measuring instrument, and the measurement of the background value of the radon concentration measuring instrument begins. When the nitrogen concentration measured by the nitrogen concentration measuring device 2 does not reach the preset concentration, the gas in the containment cavity 110 cannot be used to measure the main value of the radon concentration measuring instrument. At this time, it is necessary to increase the nitrogen concentration in the containment cavity 110. When the nitrogen concentration measured by nitrogen concentration measuring device 2 does not reach the preset concentration, the gas in the receiving cavity 110 can be discharged out through nitrogen outlet port 103. Then, the nitrogen outlet port 103 is closed, and high-purity nitrogen is supplied to the receiving cavity 110 to increase the nitrogen concentration in the receiving cavity 110. Then, the nitrogen concentration measuring device 2 is used to measure the change in nitrogen concentration in the receiving cavity 110 until the nitrogen concentration in the receiving cavity 110 reaches the preset concentration.

[0083] In related technologies, background value measuring devices have complex structures and cumbersome operation procedures, requiring specialized technicians for complex operations, leading to increased measurement costs and reduced measurement efficiency. The background value measuring device 100 provided in this application has a simple structure and is easy to operate. In use, the operator only needs to connect the nitrogen inlet port 102 to the nitrogen supply equipment, activate the vacuum pump to create a vacuum, and open the valve to begin measuring the background value of the radon concentration meter. This simple operation greatly improves work efficiency and reduces the technical requirements and workload for operators.

[0084] The process of measuring the background value of a radon concentration meter using the background value measuring device 100 provided in the embodiments of this application will be described below. The process includes the following steps ① to ④.

[0085] ① Vacuuming operation: Open the vacuum pump valve 62 to start the vacuum pump; after the vacuum pump starts, it begins to extract the gas in container 1. As the gas extraction process progresses, closely observe the changes in the value of the digital pressure gauge 3; when the pressure drops to near vacuum, keep the vacuum pump running for a period of time to extract as much gas as possible from container 1, thereby creating a high vacuum environment; then close the vacuum valve 62 to complete the vacuuming operation.

[0086] ② Nitrogen filling operation: Open the nitrogen inlet port 102 and connect the steel cylinder containing 99% compressed nitrogen to the nitrogen inlet port 102 of container 1; then, open the valve on the steel cylinder to fill the container 1 with high-purity nitrogen; during this process, the nitrogen concentration sensor 2 monitors the change in nitrogen concentration in container 1 in real time. When the nitrogen concentration in container 1 reaches 99%, close the nitrogen inlet port 102 to complete the nitrogen filling. At this time, container 1 has stored high-purity nitrogen that meets the measurement requirements.

[0087] ③ Background Measurement: Connect the nitrogen outlet 103 tightly to the inlet of the radon concentration meter using a silicone hose, ensuring there is no gas leakage at the connection point. Then, slowly open the valve at the nitrogen outlet 103. The high-purity nitrogen in container 1 flows into the radon concentration meter through the nitrogen outlet 103 under the action of pressure difference. During the nitrogen inflow process, continuously observe the digital pressure gauge on the depressurization valve and ensure that the pressure at the nitrogen outlet 103 is stable within the normal range. At the same time, the radon concentration meter starts working and measures the inflowing nitrogen. Since nitrogen contains almost no radon, the measured value displayed by the radon concentration meter at this time is its own background value. Record the background value displayed by the radon concentration meter for subsequent measurement of the radon concentration in the environment.

[0088] ④ Shutdown: After measurement, close the valve at nitrogen outlet 103 to stop nitrogen flow. Then, disconnect the connecting pipe between the radon concentration meter and container 1 and store it properly. If there is still nitrogen remaining in container 1, decide whether to retain it for the next measurement based on the actual situation. If retaining it, close the inlet valve 7 at nitrogen inlet 102 to ensure that the nitrogen in container 1 is in a sealed storage state. If not retaining it, the nitrogen in container 1 can be released by slowly opening the pressure relief valve 5. After the pressure drops to zero, close the pressure relief valve 5.

[0089] Regarding the embodiments of this application, it should also be noted that, without conflict, the embodiments of this application and the features in the embodiments can be combined with each other to obtain new embodiments.

[0090] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. The scope of protection of this application shall be determined by the scope of the claims.

Claims

1. A device suitable for measuring the background value of a radon concentration measuring instrument, characterized in that, include: A container that forms a cavity for containing nitrogen gas; A vacuum port is fluidly connected to the receiving cavity and is used to evacuate the receiving cavity; A nitrogen inlet port is in fluid communication with the receiving cavity and is used to supply high-purity nitrogen into the receiving cavity; The nitrogen outlet is in fluid communication with the containment cavity and is used to discharge the gas in the containment cavity to the outside. The nitrogen outlet is also used to connect to the inlet of the radon concentration measuring instrument. A nitrogen concentration measuring device is used to measure the concentration of nitrogen in the containment cavity to determine whether the gas in the containment cavity can be used to measure the background value of the radon concentration measuring instrument.

2. The apparatus according to claim 1, characterized in that, The nitrogen concentration measuring device is located at the bottom of the container.

3. The apparatus according to claim 1, characterized in that, The nitrogen inlet is located at the top of the container.

4. The apparatus according to claim 1, characterized in that, The nitrogen outlet is located at the top of the container.

5. The apparatus according to claim 1, characterized in that, Also includes: A pressure measuring device is used to measure the air pressure of the receiving cavity, so that the nitrogen concentration measuring device measures the nitrogen concentration in the receiving cavity under a preset air pressure.

6. The apparatus according to claim 1, characterized in that, Also includes: The three-way structure includes three interconnected first ports, second ports and third ports, wherein the first port is connected to the nitrogen outlet interface and the second port is used to connect to the radon concentration measuring instrument inlet. A pressure relief valve, connected to the third port of the three-way structure, is used to automatically relieve pressure in the receiving cavity when the pressure in the receiving cavity is higher than a preset value.

7. The apparatus according to claim 6, characterized in that, Also includes: A decompression valve is located between the second port of the three-way structure and the inlet of the radon concentration measuring instrument, and is used to control the flow rate of high-purity nitrogen from the second port into the inlet of the radon concentration measuring instrument.

8. The apparatus according to claim 7, characterized in that, The decompression valve includes a built-in pressure measuring device for measuring the pressure of high-purity nitrogen flowing out from the second port, so as to measure the background value of the radon concentration measuring instrument after the pressure stabilizes.

9. The apparatus according to claim 1, characterized in that, Also includes: An insulation layer is disposed on the outer surface of the container to keep the cavity warm.

10. The apparatus according to any one of claims 1-9, characterized in that, Also includes: The protective housing contains both the container and the nitrogen concentration measuring device.

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