Diffusion type radon gas sensor for measuring environment radon concentration

Abstract

The utility model relates to a diffusion type radon gas sensor for environmental radon concentration measurement, and the sensor comprises a cavity housing, a cavity substrate, a detector assembly, and a signal processing module. The chamber shell is a cylinder, one end of the chamber shell is sealed by an arched dome, so that an electric field in the measurement chamber is uniformly distributed, the other end of the chamber shell is connected with the chamber substrate, the chamber shell and the chamber substrate form a Faraday cage type measurement chamber, and the Faraday cage type measurement chamber has a good electromagnetic shielding effect and anti-interference performance; diffusion air holes are formed in the cavity substrate; the detector assembly is installed on the chamber substrate, is located in the measurement chamber, and is used for detecting a charged particle signal generated by radon decay in the measurement chamber. The signal processing module is installed on the detector assembly, is electrically connected with the detector assembly, and is used for converting the charged particle signal detected by the detector assembly into the radon concentration. Gas sampling of the diffusion-type radon gas sensor is performed according to air static diffusion, no extra air exchange device is needed, and the structure is small and light.

Description

Technical Field

[0001] This specification relates to the field of indoor environmental monitoring technology, and in particular to a diffusion-type radon gas sensor for measuring environmental radon concentration. Background Technology

[0002] Indoor air quality, as a key indicator of the comfort and health of the living environment, has increasingly become a focus of public attention. Among the many pollutants and allergens affecting indoor air quality, radon, a colorless and odorless radioactive gas, enters the human body through respiration. The alpha particles released during its decay process cause radiation damage to the respiratory system and are the second leading cause of lung cancer after smoking. Therefore, long-term monitoring and effective control of indoor radon are particularly crucial.

[0003] Currently, equipment for measuring indoor radon levels is mainly designed and developed based on pulse ionization chambers or electrostatic collection methods. Among these, equipment based on pulse ionization chambers or electrostatic collection methods offers high measurement sensitivity and good stability, and can be used for instantaneous sampling and measurement of indoor radon levels, obtaining radon concentration curves over time. However, these instruments are relatively expensive, require greater expertise, and demand highly skilled operators. Long-term monitoring requires a continuous power supply, and electrostatic collection radon measuring instruments also need to meet measurement requirements such as environmental humidity control.

[0004] How to reduce the design cost of radon gas measurement equipment so that it can operate independently or be seamlessly integrated into smart home systems without human intervention and maintenance is a technical problem that urgently needs to be solved. Utility Model Content

[0005] To address the problems in the prior art, this embodiment provides a diffusion-type radon gas sensor for measuring environmental radon concentration. The diffusion-type radon gas sensor of this embodiment has a compact overall structure and features high sensitivity and low power consumption. It can operate independently or be connected to a smart home system, and is suitable for long-term monitoring of radon concentration in general household environments. It is a more convenient, economical, and reliable radon gas detection solution.

[0006] On one hand, embodiments of this specification provide a diffusion-type radon gas sensor for measuring ambient radon concentration, comprising:

[0007] Chamber housing, chamber substrate, detector assembly, and signal processing module;

[0008] The outer shell of the chamber is cylindrical, one end of which is sealed by an arched dome, and the other end is connected to the chamber substrate. The outer shell and the chamber substrate form a Faraday cage-type measuring chamber.

[0009] The chamber substrate is provided with diffusion pores;

[0010] The detector assembly is mounted on the chamber substrate and located inside the measurement chamber, for detecting the charged particle signal generated by radon decay inside the measurement chamber;

[0011] The signal processing module is installed on the detector assembly and electrically connected to the detector assembly, and is used to convert the charged particle signal detected by the detector assembly into radon concentration.

[0012] Furthermore, the connection between the arched dome and the outer shell of the chamber is an arc-shaped bend.

[0013] Furthermore, both the inner and outer surfaces of the chamber shell are electroplated with metal layers, and the inner and outer surfaces are at the same potential point.

[0014] Furthermore, the end of the chamber shell connected to the chamber substrate is provided with a contact plane, a groove is provided on the contact plane, and a sealing ring is provided in the groove. When the chamber shell is connected to the chamber substrate, the sealing ring contacts the chamber substrate.

[0015] Furthermore, the outer edge of the contact plane is provided with a plurality of positioning buckles with an electroplated metal layer, the positioning buckles being used for engaging the chamber shell and the chamber substrate.

[0016] Furthermore, the chamber substrate is also provided with an air filter membrane, which covers the diffuser pores and is used to filter out radon protons in the air when the air enters the measuring chamber.

[0017] Furthermore, both the top and bottom layers of the chamber substrate are covered with metal layers.

[0018] Furthermore, the detector assembly includes a detector connection plate, a detector, and a gold-plated plate;

[0019] The detector connection plate is fixed to the chamber base plate by a number of single-row pins;

[0020] The detector is welded to the first surface of the detector connecting plate via a welding fixing point and is located at the center of the detector connecting plate;

[0021] The gold-plated plate is a disc with a through hole in the center. It is mounted on the first surface of the detector connection plate through a patch pin socket and is on the same plane as the detector. The detector is located in the through hole of the gold-plated plate. The gold-plated plate and the chamber shell form a sampling cavity. A large area of ​​conductive metal layer is laid on the first surface of the gold-plated plate, which is at the same potential as the chamber shell.

[0022] Furthermore, the signal processing module is mounted on the second surface of the detector connection plate;

[0023] The detector connection board is provided with conductive vias, and the output pins of the detector are electrically connected to the input pins of the signal processing module through the conductive vias.

[0024] Furthermore, a metal shielding shell is provided on the second surface of the detector connection plate, and the signal processing module is located inside the metal shielding shell.

[0025] In the embodiments described in this specification, one end of the chamber shell is sealed with an arched dome, ensuring the continuity and transition of the chamber shell structure. This results in a uniform electric field distribution within the measurement chamber. The chamber shell and the chamber substrate form a Faraday cage-type measurement chamber, providing excellent electromagnetic shielding and anti-interference performance. When measuring ambient radon concentration, air diffuses through the diffusion vents into the measurement chamber via static diffusion. Charged particles generated by radon decay accumulate on the surface of the detector assembly within the measurement chamber under the influence of the electric field. Alpha particles generated by the decay of these charged particles are detected, and the signal processing module converts the Alpha particle signal into radon concentration. The diffusion-type radon sensor in this embodiment relies on static air diffusion for gas sampling, eliminating the need for additional air exchange devices. This results in a compact and lightweight structure. Furthermore, the uniform electric field distribution within the measurement chamber facilitates the collection of charged particles generated by radon decay. The Faraday cage-type measurement chamber enhances electromagnetic shielding and anti-interference performance, ultimately ensuring the accuracy of radon concentration measurement. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments or prior art described herein, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this article. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the diffusion-type radon gas sensor in the embodiments of this specification;

[0028] Figure 2 This is a schematic diagram of the structure of the chamber shell in the embodiments of this specification;

[0029] Figure 3 This is a schematic diagram of the structure of the chamber substrate in the embodiments of this specification;

[0030] Figure 4 This is a schematic diagram of the detector assembly structure in the embodiments of this specification.

[0031] [Explanation of Labels in the Attached Image]

[0032] 1. Chamber outer shell;

[0033] 101. Arched dome;

[0034] 102. Outer surface;

[0035] 103. Arc-shaped bend;

[0036] 104. Inner surface;

[0037] 105. Sealing ring;

[0038] 106. Positioning buckle;

[0039] 2. Chamber substrate;

[0040] 201. Array-type diffuser pores;

[0041] 202. Air filter membrane;

[0042] 203. Positioning hole;

[0043] 204. Single row of pin mounting holes;

[0044] 205. Application Interface

[0045] 206. Circular mounting hole;

[0046] 3. Detector assembly;

[0047] 301. Detector connection plate;

[0048] 302. Detector;

[0049] 303, Gold-plated plate;

[0050] 304, single row of pins;

[0051] 305. Surface Mount Pin Socket;

[0052] 306. Welding fixing points;

[0053] 307. Metal shielding shell;

[0054] 4. Signal processing module. Detailed Implementation

[0055] The technical solutions in the embodiments described below will be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments described herein, and not all of the embodiments. Based on the embodiments described herein, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this document.

[0056] like Figure 1The following is an embodiment of the diffusion-type radon gas sensor for measuring environmental radon concentration provided in this specification, including a chamber housing 1, a chamber substrate 2, a detector assembly 3, and a signal processing module 4;

[0057] The outer shell 1 of the chamber is cylindrical. One end of the outer shell 1 is sealed by an arched dome 101, and the other end is connected to the chamber substrate 2. The outer shell 1 and the chamber substrate 2 form a Faraday cage-type measuring chamber.

[0058] The chamber substrate 2 is provided with diffusion pores;

[0059] The detector assembly 3 is mounted on the chamber substrate 2 and located inside the measurement chamber, for detecting the charged particle signal generated by radon decay inside the measurement chamber;

[0060] The signal processing module 4 is installed on the detector assembly 3 and electrically connected to the detector assembly 3, and is used to convert the charged particle signal detected by the detector assembly 3 into radon concentration.

[0061] In the embodiments described in this specification, one end of the chamber shell is sealed with an arched dome, ensuring the continuity and transition of the chamber shell structure. This results in a uniform electric field distribution within the measurement chamber. The chamber shell and the chamber substrate form a Faraday cage-type measurement chamber, providing excellent electromagnetic shielding and anti-interference performance. When measuring ambient radon concentration, air diffuses through the diffusion vents into the measurement chamber via static diffusion. Charged particles generated by radon decay accumulate on the surface of the detector assembly within the measurement chamber under the influence of the electric field. Alpha particles generated by the decay of these charged particles are detected, and the signal processing module converts the Alpha particle signal into radon concentration. The diffusion-type radon sensor in this embodiment relies on static air diffusion for gas sampling, eliminating the need for additional air exchange devices. This results in a compact and lightweight structure. Furthermore, the uniform electric field distribution within the measurement chamber facilitates the collection of charged particles generated by radon decay. The Faraday cage-type measurement chamber enhances electromagnetic shielding and anti-interference performance, ultimately ensuring the accuracy of radon concentration measurement.

[0062] In the embodiments of this specification, the chamber housing 1 and the chamber substrate 2 can be detachably connected by snap-fit ​​to form a unified shape structure of the sensor, with an overall size of 60mm×60mm×23mm; the chamber substrate 2 and the detector assembly 3 can be fixed by pins, which has a strong electrical connection characteristic; the signal processing module 4 is soldered to the detector assembly 3.

[0063] In the embodiments described in this specification, in order to further ensure the continuity of the chamber outer shell 1, such as... Figure 2As shown, the connection between the arched dome 101 and the outer shell 1 of the chamber is a circular arc bend 103, thereby further ensuring the continuity and transition of the structure.

[0064] The chamber shell 1 can be injection molded from ABS, and a metal layer can be electroplated on both the inner surface 104 and the outer surface 102 of the chamber shell 1. The metal layer can be a nickel metal layer, and the inner surface 104 and the outer surface 102 are always at the same potential point.

[0065] Preferably, the inner surface 104 is smooth and burr-free, allowing for a uniform distribution of the internal electric field and preventing partial discharge.

[0066] The end of the chamber shell 1 that connects to the chamber substrate 2 is provided with a contact plane. A groove is provided on the contact plane, and a sealing ring 105 is provided in the groove. When the chamber shell 1 and the chamber substrate 2 are connected, the sealing ring 105 contacts the chamber substrate 2.

[0067] This can be understood as follows: the structure of the contact plane and the sealing ring 105 prevents air from entering the measurement chamber from the contact area between the chamber shell 1 and the chamber substrate 2, thereby avoiding turbulence within the measurement chamber and affecting the air diffusion effect. Since the detector is light-sensitive, the sealing ring can also effectively prevent light leakage from the structure, while ensuring that the sampled gas inside the measurement chamber comes from the diffusion pores, effectively filtering out radon progeny from the air.

[0068] Preferably, the bottom of the chamber shell 1 can be gradually widened and extended outward to form the contact plane, ensuring the strength of the connection between the chamber shell 1 and the chamber substrate 2.

[0069] Furthermore, the outer edge of the contact plane is provided with a plurality of positioning buckles 106 having an electroplated metal layer, the positioning buckles 106 being used for engaging the chamber shell 1 and the chamber substrate 2.

[0070] In the embodiments described in this specification, such as Figure 3 As shown, metallized positioning holes 203 can be opened at corresponding positions on the chamber substrate 2, so that the positioning buckle 106 on the chamber shell 1 and the positioning hole 203 on the chamber substrate 2 can fit tightly together and form an electrical connection. The chamber shell 1 and the chamber substrate 2 form a Faraday cage, which has good electromagnetic shielding effect and anti-interference performance.

[0071] In addition, the reaction force of the sealing ring 105 makes the positioning buckle 106 fit more tightly and reliably with the positioning hole 203.

[0072] In the embodiments described in this specification, the chamber substrate 2 is a PCB circuit board designed based on FR-4 board material, with copper layers evenly laid on the top and bottom layers, providing both load-bearing capacity and connectivity. For example... Figure 3As shown, the diffusion holes on the chamber substrate 2 are array-type diffusion holes 201, and the exchange of air in the measurement chamber is carried out through the array-type diffusion holes 201.

[0073] An air filter membrane 202 is also provided on the chamber substrate 2. The air filter membrane 202 covers the diffuser pores and is used to filter out radon protons in the air when the air enters the measuring chamber. Further, a rectangular groove is designed on the bottom layer of the chamber substrate 2, and the air filter membrane 202 is laid flat and pasted in the groove, covering the array of diffuser pores 201.

[0074] The bottom layer design of the chamber substrate 2 uses interface 205 as a unified power supply and communication interface for the sensor.

[0075] The chamber substrate 2 has circular mounting holes 206 at the four corners of its edge, which can meet the needs of fixing and assembling the sensor in various occasions.

[0076] According to one embodiment of this specification, such as Figure 4 As shown, the detector assembly 3 includes a detector connection plate 301, a detector 302, and a gold-plated plate 303.

[0077] The detector connection plate 301 is fixed to the chamber base plate 2 by a number of single-row pins 304;

[0078] The detector 302 is welded to the first surface of the detector connecting plate 301 via welding fixing point 306 and is located at the center of the detector connecting plate 301.

[0079] The gold-plated plate 303 is a disc with a through hole in the center. It is mounted on the first surface of the detector connection plate 301 through the patch pin socket 305 and is on the same plane as the detector 302. The detector 302 is located in the through hole of the gold-plated plate 303. The gold-plated plate 303 and the chamber shell 1 form a sampling cavity. The first surface of the gold-plated plate 303 is covered with a large area of ​​metal conductive layer, which is at the same potential as the chamber shell 1.

[0080] Furthermore, such as Figure 3 As shown, the chamber substrate 2 is also provided with a single row of pin mounting holes 204 that cooperate with the single row of pins 304. The single row of pins 304 are inserted into the corresponding single row of pin mounting holes 204 and soldered.

[0081] It can be understood that, based on the structure of the single row of pins 304, a gap is formed between the detector connection plate 301 and the chamber substrate 2. The narrow channel between the two constitutes a gas exchange pathway, ensuring uniform static diffusion of ambient air while also providing light protection.

[0082] The detector 302 can be a plug-in or surface-mount silicon detector. The detector 302 is installed at the center of the top layer of the detector connection plate 301. The gold-plated plate 303 is kept on the same plane as the detector 302, and together with the chamber shell 1, they form a small air sampling cavity, wherein the gold-plated plate 303 and the chamber shell 1 are at the same potential.

[0083] When the anode of detector 302 is given a negative 40V bias voltage and the outer shell 1 of the chamber is connected to ground potential or a safe voltage not exceeding 36V, a weak electric field with a voltage difference of 40V-76V is formed in the air sampling chamber, which is more conducive to collecting charged particles generated by radon decay.

[0084] In this embodiment, the signal processing module 4 is mounted on the second surface of the detector connection plate 301. The detector connection plate 301 has conductive vias, and the output pin of the detector 302 is electrically connected to the input pin of the signal processing module 4 through the conductive vias. This allows the input signal from the detector 302 to be transmitted to the signal processing module 4.

[0085] According to one embodiment of this specification, in order to further ensure the stability and security of the sensor output signal, such as Figure 4 As shown, a metal shielding shell 307 is also provided on the second surface of the detector connection plate 301, and the signal processing module 4 is located inside the metal shielding shell 307.

[0086] This can be understood as follows: the metal shielding shell 307 tightly covers the signal processing module 4 and welds it to the bottom layer (second surface) of the detector connection plate 301, forming a Faraday cage to effectively magnetically shield the signal processing module, ensuring the stability and safety of the output signal.

[0087] In the embodiments described in this specification, the signal processing module 4 may include a charge-sensitive preamplifier, a shaper, a counter, a controller, a transmission interface module, a low-voltage power supply module, and a bias voltage module. It acquires, converts, filters, and shapes the signal output from the detector 302, transforming it into a valid signal that can be recognized by the counter. The counter outputs the number of alpha particle signals, and the controller outputs the final environmental radon concentration based on the ratio of the number of alpha particle signals to the radon concentration. The entire signal processing module 4 employs a low-power device design to achieve energy efficiency optimization and long standby time.

[0088] Optionally, the controller can be a microcontroller. The counter output pin is connected to a pin of the microcontroller. Each bit of the parallel digital signal output by the counter is a binary logic level, and the combination of output values ​​represents the binary result of the current count. The parallel digital signal is input to the microcontroller, which converts the binary value into ASCII code. Then, based on the ASCII code and a pre-defined ratio between the number of alpha particles and the radon concentration, the corresponding environmental radon concentration is calculated.

[0089] In addition, the controller can also be an analog circuit. The signal output by the counter is passed through a DAC to obtain a voltage V_count. Then, an operational amplifier circuit is used to multiply V_count by the set ratio k of the number of Alpha particle signals to the radon concentration, so that k*V_count=V_percent (for example, 0-5V corresponds to 0-100%), where V_percent is the ambient radon concentration.

[0090] Subsequently, the signal processing module 4 can transmit the ambient radon concentration to the central display area of ​​a computer or smart home system for display. This specification does not limit the embodiments.

[0091] It should be understood that in the various embodiments of this document, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

[0092] It should also be understood that, in the embodiments herein, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.

[0093] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this document.

[0094] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0095] In the embodiments provided herein, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the couplings or direct couplings or communication connections shown or discussed may be indirect couplings or communication connections through some interfaces, devices, or units, or they may be electrical, mechanical, or other forms of connection.

[0096] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the embodiments described herein, depending on actual needs.

[0097] Furthermore, the functional units in the various embodiments of this document can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0098] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this paper, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this paper. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0099] This document uses specific embodiments to illustrate the principles and implementation methods of this document. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of this document. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this document. Therefore, the content of this specification should not be construed as a limitation of this document.

Claims

1. A diffusion radon sensor for environmental radon concentration measurements, characterized in that, The utility model relates to a radon concentration measuring device, including: chamber shell (1), chamber base plate (2), detector assembly (3) and signal processing module (4); The chamber shell (1) is a cylinder, one end of the chamber shell (1) is sealed by an arched dome (101), the other end is connected with the chamber base plate (2), and the chamber shell (1) and the chamber base plate (2) form a measurement chamber in a Faraday cage type; The chamber base plate (2) is provided with a diffusion air hole; The detector assembly (3) is installed on the chamber base plate (2) and located in the measurement chamber for detecting the charged particle signal generated by radon decay in the measurement chamber; The signal processing module (4) is installed on the detector assembly (3) and electrically connected with the detector assembly (3) for converting the charged particle signal detected by the detector assembly (3) into radon concentration.

2. The diffusion-based radon gas sensor for environmental radon concentration measurements according to claim 1, characterized in that, The arched dome (101) is bent in a circular arc shape (103) at the connection with the chamber shell (1).

3. The diffusion-based radon gas sensor for environmental radon concentration measurements according to claim 1, characterized in that, The inner surface (104) and the outer surface (102) of the chamber shell (1) are both plated with a metal layer, and the inner surface (104) and the outer surface (102) are at the same potential point.

4. The diffusion-based radon gas sensor for environmental radon concentration measurements according to claim 1, characterized in that, The end of the chamber shell (1) connected with the chamber base plate (2) is provided with a contact plane, the contact plane is provided with a groove, the groove is provided with a sealing ring (105), and the sealing ring (105) is in contact with the chamber base plate (2) when the chamber shell (1) is connected with the chamber base plate (2).

5. Diffusion radon sensor for environmental radon concentration measurements according to claim 4, characterized in that, The outer edge of the contact plane is provided with a plurality of positioning buckles (106) plated with a metal layer, and the positioning buckles (106) are used for clamping the chamber shell (1) and the chamber base plate (2).

6. The diffusion-based radon gas sensor for environmental radon concentration measurements according to claim 1, characterized in that, The chamber base plate (2) is further provided with an air filter membrane (202), the air filter membrane (202) covers the diffusion air hole, and radon daughter particles in the air are filtered out when the air enters the measurement chamber.

7. The diffusion-based radon gas sensor for environmental radon concentration measurements according to claim 1, characterized in that, The top layer and the bottom layer of the chamber base plate (2) are both paved with a metal layer.

8. The diffusion-based radon gas sensor for environmental radon concentration measurements according to claim 1, characterized in that, The detector assembly (3) includes a detector connecting plate (301), a detector (302) and a gold-plated plate (303); The detector connecting plate (301) is fixed on the chamber base plate (2) through a plurality of single-row plug pins (304); The detector (302) is welded to the first surface of the detector connecting plate (301) through a welding fixing point (306) and located at the center of the detector connecting plate (301); The gold-plated plate (303) is a disc with a through hole in the center, is installed on the first surface of the detector connecting plate (301) through a patch plug pin seat (305) and is in the same plane as the detector (302), the detector (302) is located in the through hole of the gold-plated plate (303), the gold-plated plate (303) forms a sampling cavity with the chamber shell (1), and a large-area metal conductive layer is paved on the first surface of the gold-plated plate (303) to be at the same potential as the chamber shell (1).

9. Diffusion radon sensor for environmental radon concentration measurements according to claim 8, characterized in that, The signal processing module (4) is installed on the second surface of the detector connecting plate (301). The probe connecting plate (301) is provided with conductive through holes, and output pins of the probe (302) are electrically connected with input pins of the signal processing module (4) through the conductive through holes.

10. Diffusion radon sensor for environmental radon concentration measurements according to claim 9, characterized in that, A metal shielding shell (307) is further arranged on the second surface of the probe connecting plate (301), and the signal processing module (4) is located in the metal shielding shell (307).

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