Radioactive gas measuring device

Abstract

The embodiment of the invention relates to a radioactive gas measuring device, comprising: a chamber body, in which a gas chamber for accommodating gas to be measured is formed, and the chamber body is provided with a mounting port communicated with the gas chamber; the detector is arranged at the mounting opening, the detection surface of the detector faces the interior of the air chamber, and the detector blocks the mounting opening to form a sealing boundary of the air chamber; wherein the chamber body or the detector is provided with an air inlet channel and an air outlet channel which are communicated with the air chamber. The PIPS detector directly blocks the mounting port and forms a sealed boundary, so that the direct contact between the detection surface and the detected gas is realized, the attenuation of a window material to alpha particles or low-energy beta particles is eliminated, the measurement sensitivity is improved, and the limitation that the detector in the traditional measurement device needs to be placed in an independent sleeve or measured through a protection window is overcome; meanwhile, the detector serves as the top wall of the cavity body and is matched with the air inlet channel and the air outlet channel which are integrated on the cavity body or the detector, so that the whole device is more compact in structure.

Description

Technical Field

[0001] This application relates to the field of nuclear radiation monitoring technology, and in particular to a radioactive gas measuring device. Background Technology

[0002] In existing measurement systems, passivated ion implanted planar silicon (PIPS) detectors are typically used to capture electrons or β particles in order to improve the detection efficiency of specific decay modes (such as β-γ measurements).

[0003] Traditional radioactive gas measurement chambers typically employ an isolated design, where the gas to be measured is enclosed within a separate container, and the detector is located outside the container or detects the internal gas through a window (such as a beryllium window or a thin-walled stainless steel window). However, for low-energy β particles or converted electrons, even an extremely thin physical isolation window can cause significant energy attenuation, leading to reduced detection efficiency and making it difficult to meet the measurement requirements of extremely low concentration samples. Summary of the Invention

[0004] One object of this application is to provide a radioactive gas measuring device that at least solves the above-mentioned problems.

[0005] To achieve the above objectives, some embodiments of this application provide a radioactive gas measuring device, comprising:

[0006] The chamber body has an internal chamber for containing the gas to be measured, and the chamber body has an installation port that communicates with the gas chamber.

[0007] The detector is installed at the mounting port, with its detection surface facing the inside of the air chamber, and the detector blocks the mounting port to form a sealed boundary of the air chamber.

[0008] The chamber body or detector is equipped with an air inlet channel and an air outlet channel that are connected to the air chamber.

[0009] Compared with related technologies, the solution provided in this application embodiment achieves direct contact between the detection surface and the gas being measured by having the PIPS detector directly seal the installation port and form a sealed boundary. This eliminates the attenuation of alpha particles or low-energy beta particles by the window material, improves measurement sensitivity, and overcomes the limitations of traditional measurement devices where the detector needs to be placed in an independent sleeve or measured through a protective window. At the same time, the detector itself acts as the top wall of the chamber body, and together with the air inlet and outlet channels integrated into the chamber body or the detector, the overall device structure is more compact, significantly reducing the size of the device. Attached Figure Description

[0010] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0011] Figure 1 This is a cross-sectional schematic diagram of the measuring device provided in an embodiment of this disclosure;

[0012] Figure 2 This is a schematic diagram of the measuring device provided in an embodiment of the present disclosure from another perspective;

[0013] Figure 3 This is a schematic diagram of the measuring device provided in an embodiment of the present disclosure from another perspective;

[0014] Figure 4 This is a cross-sectional schematic diagram of the detector provided in an embodiment of this disclosure.

[0015] Figure label:

[0016] 10: Chamber body; 101: Air chamber; 102: Support step; 103: Air inlet channel; 104: Air outlet channel; 105: Flange edge;

[0017] 20: Detector; 201: First housing; 202: Second housing; 203: Third housing; 204: Detection surface; 205: Pressure balancing structure; 206: Internal cavity; 207: First load-bearing step; 208: Second load-bearing step;

[0018] 30: Drainage tube;

[0019] 40: Annular pressure cap; 401: Pressing part; 402: Annular limiting flange;

[0020] 501: First sealing ring; 502: Second sealing ring; 503: Third sealing ring; 504: Fourth sealing ring;

[0021] 60: Pipe joint. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0024] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0025] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0026] Unless otherwise stated, the term "multiple" means two or more.

[0027] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0028] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0030] Combination Figures 1 to 4As shown in the embodiment of this disclosure, a radioactive gas measuring device includes: a chamber body 10, which has a gas chamber 101 formed inside for containing the gas to be measured, and an installation port on the chamber body 10 communicating with the gas chamber 101; a detector 20, which is disposed at the installation port, with the detection surface 204 of the detector 20 facing the inside of the gas chamber 101, and the detector 20 blocking the installation port to form a sealed boundary of the gas chamber 101; wherein, the chamber body 10 or the detector 20 is provided with an inlet channel 103 and an outlet channel 104 communicating with the gas chamber 101.

[0031] The radioactive gas measuring device provided in this embodiment achieves direct contact between the detection surface 204 and the gas being measured by directly sealing the installation port and forming a sealed boundary with the PIPS detector 20. This eliminates the attenuation of alpha particles or low-energy beta particles by the window material, improves the measurement sensitivity, and overcomes the limitations of traditional measuring devices where the detector 20 needs to be placed in an independent sleeve or measured through a protective window. At the same time, the detector 20 itself serves as the top wall of the chamber body 10. Combined with the air inlet channel 103 and air outlet channel 104 integrated on the chamber body 10 or the detector 20, the overall device structure is more compact, significantly reducing the size of the device.

[0032] Optionally, the inner wall of the mounting port is provided with a support step 102 protruding inward, and the detector 20 extends into the mounting port at least partially and abuts against the support step 102 along the axial direction; wherein, a first sealing ring 501 is sandwiched between the mating surfaces of the detector 20 and the support step 102 to form a first-level sealing structure.

[0033] The inner convex support step 102 on the inner wall of the mounting port provides an axial positioning reference for the detector 20, ensuring that the detection surface 204 is always at a predetermined depth within the gas chamber 101, thus guaranteeing the consistency of measurement geometric efficiency. Furthermore, in conjunction with the use of the first sealing ring 501, the pressure generated by axial contact achieves a primary seal, effectively preventing the measured radioactive gas from leaking into the external environment and ensuring the safety of the measurement process.

[0034] In some embodiments, the support step 102 is a ring-shaped structure, which is arranged circumferentially around the inner wall of the mounting opening.

[0035] The ring-shaped support step 102 can provide continuous and uniform support force to the detector 20 in the circumferential direction, avoiding stress concentration or slight deformation of the detector 20 housing that may be caused by point or segmented support; in addition, it helps to ensure that the compression of the first sealing ring 501 in the circumferential direction is consistent, thereby ensuring the reliability of airtightness in long-term use.

[0036] In some embodiments, the detector 20 is recessed inward along the circumferential direction at one end of the detection surface 204 to form a first bearing step 207. The end face of the first bearing step 207 overlaps the support step 102, and the first sealing ring 501 is sandwiched between the first bearing step 207 and the support step 102.

[0037] The recessed structure (first bearing step 207) at the end of the detector 20 forms a shape fit with the support step 102, which not only further defines the radial position of the detector 20, but also forms a specific area for accommodating and pressing the first sealing ring 501. This stepped overlap design optimizes the force transmission path, so that the first sealing ring 501 can be stably constrained between the mating surfaces when subjected to axial pressure, preventing the first sealing ring 501 from shifting due to pressure fluctuations.

[0038] Optionally, the air intake channel 103 and the air outlet channel 104 are formed within the support step 102, or the air intake channel 103 and the air outlet channel 104 are formed on the peripheral sidewall of the detector 20; wherein the air intake channel 103 and the air outlet channel 104 are arranged radially opposite to each other.

[0039] By creating the inlet and outlet air passages 104 on the support step 102 or the side wall of the detector 20 and arranging them radially opposite each other, the gas flow field within the gas chamber 101 can be optimized. This helps the gas being measured to flow quickly across the surface of the detector surface 204, reduces dead zones in the airflow, improves gas replacement efficiency, and thus shortens the measurement response time.

[0040] Optionally, it also includes: a guide tube 30, one end of which is connected to the air outlet channel 104, and the other end of which extends to the bottom region of the air chamber 101.

[0041] The flow guide tube 30 solves the problem of gas short-circuiting that may be caused by a single inlet and outlet. By extending the gas path to the bottom of the gas chamber 101, the gas is forced to form a convection or displacement circulation (e.g., bottom inlet and top outlet or top inlet and bottom outlet) within the chamber, ensuring that the stale gas stagnating at the bottom of the gas chamber 101 can be fully replaced by fresh gas, thus guaranteeing the representativeness of the sampling and the accuracy of the measurement data.

[0042] Optionally, it further includes: an annular cover 40, which is sleeved on the periphery of the detector 20 and detachably connected to the chamber body 10; wherein, the annular cover 40 is pressed on the end face of the detector 20 opposite to the air chamber 101, and a second sealing ring 502 is provided between the annular cover 40 and the detector 20, and a third sealing ring 503 is provided between the annular cover 40 and the chamber body 10, and the second sealing ring 502 and the third sealing ring 503 are coaxially arranged.

[0043] The annular gland 40 mechanically locks the detector 20 to the chamber body 10 via a detachable connection, enabling convenient disassembly and maintenance. The second sealing ring 502 (sealing the detector 20 and the annular gland 40) and the third sealing ring 503 (sealing the annular gland 40 and the chamber body 10), together with the first sealing ring 501, form a multi-layer sealing system. This coaxially arranged double or multiple sealing structure greatly improves the sealing reliability of the device under high pressure or high vacuum conditions, effectively blocking any potential path for ambient air infiltration or internal gas leakage.

[0044] In some embodiments, the outer peripheral wall of the detector 20 is provided with a second bearing step 208 facing away from the detection surface 204, the annular cover 40 has an inwardly extending pressing part 401, the pressing part 401 axially abuts against the second bearing step 208, and the second sealing ring 502 is sandwiched between the pressing part 401 and the second bearing step 208.

[0045] The second bearing step 208 on the outer peripheral wall of the detector 20 provides a force-bearing surface for the annular cover 40. The pressing part 401 of the annular cover 40 abuts against the second bearing step 208, axially transmitting the locking force to the detector 20, thereby pressing the first sealing ring 501 at the bottom. At the same time, the second sealing ring 502 is positioned here to seal the gap between the detector 20 and the annular cover 40, preventing gas from entering the internal structure of the annular cover 40.

[0046] In some embodiments, the chamber body 10 extends radially outward at the port edge of the mounting port to form a flange edge 105, the outer periphery of the annular gland 40 covers the flange edge 105, and the third sealing ring 503 is sandwiched between the flange edge 105 and the annular gland 40.

[0047] The flange edge 105 extending from the port of the chamber body 10 increases the sealing contact area, providing an installation platform for the annular gland 40. The placement of the third sealing ring 503 here can block the communication between the external environment and the internal space of the chamber body 10, forming the outermost protective barrier of the device, ensuring that even if the internal seal fails, the gas will not leak directly into the atmosphere.

[0048] Optionally, both the intake passage 103 and the exhaust passage 104 extend through the annular cover 40; wherein, the intake passage 103 and the exhaust passage 104 are respectively equipped with pipe joints 60 at the ports of the annular cover 40, and the pipe joints 60 are fixed to the annular cover 40 by a threaded connection structure or a compression fitting connection structure.

[0049] The air inlet channel 103, air outlet channel 104, and pipe connector 60 are integrated onto the annular cover 40, so that all air connections are located at the top of the device. This not only simplifies the manufacturing process of the chamber body 10, but also facilitates pipe connections and operations, and avoids spatial interference that may be caused by lateral pipe connections.

[0050] Optionally, an annular gap is formed between the detector 20 located in the mounting port and the inner wall of the mounting port. An annular pressure cap 40 is provided with an annular limiting flange 402 protruding axially on the side facing the air chamber 101. The annular limiting flange 402 is embedded in the annular gap to radially position the detector 20.

[0051] The annular limiting flange 402 on the annular cap 40 is embedded in the annular gap between the detector 20 and the mounting port, which serves to limit and center the detector radially. This ensures that the detector 20 automatically aligns during installation, ensuring that it is coaxial with the chamber body 10. It also fills the original structural gaps, reduces non-measuring areas, and helps to improve the gas replacement rate.

[0052] In some embodiments, the air intake passage 103 and the air outlet passage 104 extend through the annular limiting flange 402 to communicate with the pipe connector 60.

[0053] The air inlet channel 103 and the air outlet channel 104 pass through the annular limiting flange 402, using the solid space of the annular limiting flange 402 as a gas path carrier to achieve gas connection from the external pipeline to the internal air chamber 101. This avoids the need for additional gas path pipes, making the overall structure more compact, while ensuring that the airflow can be accurately guided to the periphery of the detector 20 or a specific area of ​​the air chamber 101.

[0054] Optionally, the detector 20 is configured with a pressure balancing structure 205 to maintain pressure balance on both the inner and outer sides of the detection surface 204 of the detector 20.

[0055] The pressure balancing structure 205 keeps the pressure on both the inside and outside of the thin detection surface 204 (usually an extremely thin silicon wafer) of the detector 20 consistent, preventing the detection surface 204 from mechanically breaking or permanently deforming due to excessive pressure difference when the gas chamber 101 is evacuated or filled with high-pressure gas.

[0056] Optionally, the detector 20 includes a first housing 201, a second housing 202, and a third housing 203 stacked along the axial direction; the first housing 201 and the third housing 203 are connected by a stepped shoulder to form the housing of the detector 20, and the second housing 202 is located in the internal cavity 206 of the housing of the detector 20; wherein, a fourth sealing ring 504 is provided at the mating step of the first housing 201 and the third housing 203.

[0057] The use of multi-layered shell steps facilitates the modular assembly of the detector 20 and the fixation of its internal components. The fourth sealing ring 504 creates an independent airtight barrier inside the detector 20, preventing corrosive components or moisture in the measured gas from entering the electronic component area at the rear of the detector 20, thus improving the stability of the detector 20's electrical performance.

[0058] Optionally, the end of the third housing 203 facing away from the first housing 201 is the detection end, and the detection surface 204 is disposed in the middle of the detection end; wherein, the pressure balancing structure 205 is at least one through hole opened on the end face of the detection end of the third housing 203, the through hole is located on the periphery of the detection surface 204 and penetrates the wall of the third housing 203, so that the internal cavity 206 of the housing of the detector 20 is in pressure communication with the air chamber 101.

[0059] The through-hole located on the periphery of the detection surface 204 creates a low-flow-resistance gas channel, which allows the pressure change of the gas chamber 101 to be instantly transmitted to the internal cavity 206 of the detector 20, ensuring that the detection wafer at the detection end is always in an isobaric environment, thus enabling it to work safely under variable pressure conditions.

[0060] In some embodiments, a conductive connector for transmitting electrical signals is provided between the second housing 202 and the third housing 203. The conductive connector extends axially through the second housing 202 and is electrically connected to an electrode interface disposed at the top of the first housing 201. In this way, the conductive connector solves the problem of signal extraction in a multi-layered sealed housing structure. At the same time, the through-type structure is stable and less prone to poor contact due to vibration or disassembly.

[0061] In some alternative embodiments, a thermoelectric cooling module and a heat-conducting structure are also included; the cold end of the thermoelectric cooling module is thermally coupled to the detector 20, and the hot end is thermally coupled to the annular cover 40; the annular cover 40 is made of a thermally conductive metal material and has a heat dissipation structure; an insulating gasket is also sandwiched at the contact interface between the detector 20 and the chamber body 10 to block the transfer of heat between the detector 20 and the chamber body 10.

[0062] When the PIPS detector 20 operates at room temperature, the thermal noise generated by its leakage current often drowns out the low-energy beta particle signal, limiting the detection limit for extremely low concentrations of radioactive gas. This embodiment integrates a TEC cooling module within a compact annular cap 40, using the cap directly as a heat sink. This achieves localized deep cooling of the detection wafer without requiring a bulky external cooling system. Combined with the thermal insulation design at the interface of the insulating gasket, it effectively prevents heat dissipation to the chamber body 10, reducing energy consumption and avoiding condensation on the outer wall of the chamber. Thus, this embodiment reduces electronic noise and significantly improves the energy resolution and sensitivity of the device.

[0063] In some optional embodiments, the housing of the chamber body 10, the detector 20, and the annular cover 40 are all made of conductive metal; a conductive elastic element is also provided in the mounting groove where the sealing ring is located. The conductive elastic element is pressed between the detector 20 and the chamber body 10, so that a continuous electrical conduction circuit is formed between the chamber body 10, the detector 20, and the annular cover 40 to form a fully enclosed electromagnetic shielding cage.

[0064] In conventional designs, the presence of rubber seals often leads to electrical isolation between metal components, preventing the device from forming a complete Faraday cage. External electromagnetic waves can easily couple in through the gaps, interfering with weak charge signals. This embodiment achieves low-impedance connections between structural components and eliminates shielding gaps by adding conductive elastic elements (such as beryllium copper springs or conductive rubber) to the sealing interface.

[0065] In some alternative embodiments, the outlet port of the air inlet channel 103 is arranged along the tangential direction of the inner wall of the air chamber 101 so that the incoming gas forms a swirling flow in the air chamber 101; the inner wall surface of the air chamber 101 has an inverted conical or streamlined curved surface structure, and the air inlet of the air outlet channel 104 is located at the center of the bottom of the air chamber 101.

[0066] This embodiment utilizes tangential air intake to create a stable swirling flow field within the chamber. The centrifugal force and wall-attaching effect of the airflow rapidly remove stale gas trapped on the inner walls and corners. Simultaneously, the swirling flow prevents high-speed airflow from vertically impacting the fragile PIPS detector surface 204, thus protecting the sensor. Furthermore, combined with the streamlined internal cavity design, this device achieves higher cleaning efficiency with less replacement gas, shortening sample switching time in continuous measurement tasks.

[0067] In some optional embodiments, an anti-detachment limiting pin is provided between the annular cover 40 and the chamber body 10, and a longitudinal pressure relief groove is provided on the connecting thread of the annular cover 40; when the annular cover 40 is loosened and the sealing ring is disengaged from the sealing contact, the anti-detachment limiting pin still restricts the annular cover 40 from separating from the chamber body 10 until the high pressure gas in the gas chamber 101 is completely discharged through the pressure relief groove.

[0068] In practical use, if the operator accidentally disassembles the annular gland 40 under pressure, the traditional threaded connection may cause the annular gland 40 to be ejected like a bullet (gland rupture accident) when the last few turns fail. This embodiment uses a two-stage locking mechanism to force the annular gland 40 to remain mechanically held in place after the seal fails, using a pressure relief groove to release residual pressure in a directional manner. Only when the pressure is completely reduced to zero can the anti-detachment limit pin be released for complete disassembly.

[0069] In this embodiment, the main structure of the radioactive gas measuring device is constructed by a chamber body 10 and a detector 20. The chamber body 10 defines a gas chamber 101 for containing the gas to be measured, and its top has an installation port communicating with the gas chamber 101. To achieve stable installation and precise positioning of the detector 20, a ring-shaped support step 102 is circumferentially protruding inward from the inner wall of the installation port. Correspondingly, the detector 20 has a first bearing step 207 circumferentially recessed at one end near the detection surface 204. During assembly, the detector 20 extends into the installation port and uses its first bearing step 207 to overlap the support step 102 of the chamber body 10, thereby achieving axial positioning. To ensure airtightness, a first sealing ring 501 is sandwiched between the mating surfaces of the first bearing step 207 and the support step 102. When the detector 20 is subjected to downward axial pressure, the first sealing ring 501 is compressed, thus forming the first level of sealing defense for the gas chamber 101.

[0070] To lock the detector 20 and further enhance its sealing performance, the device is equipped with an annular cap 40. This annular cap 40 is fitted around the periphery of the detector 20 and is detachably fixed to the chamber body 10 using threads or bolts. Specifically, the outer peripheral wall of the detector 20 also has a second bearing step 208 facing away from the detection surface 204, while the annular cap 40 has an inwardly extending pressing portion 401. When the annular cap 40 is locked, its pressing portion 401 axially abuts against the second bearing step 208, transmitting the locking force to the detector 20, thereby pressing the first sealing ring 501 at the bottom. Based on this, this embodiment employs a multi-seal design: a second sealing ring 502 is sandwiched between the annular cap 40 and the second bearing step 208 of the detector 20, and a third sealing ring 503 is sandwiched between the flange edge 105 extending outward from the port of the chamber body 10 and the outer periphery of the annular cap 40. These three sealing rings are coaxially arranged, respectively blocking the risk of gas leakage through different paths.

[0071] Furthermore, the outer diameter of the detector 20 is designed to be slightly smaller than the inner diameter of the mounting port, forming an annular gap between them. The annular cap 40 makes full use of this space, with an annular limiting flange 402 extending axially from its side facing the air chamber 101. This annular limiting flange 402 is fitted into the annular gap. In this way, not only is the radial positioning of the detector 20 achieved, preventing it from shifting during installation or transportation, but the air path arrangement problem is also solved. Specifically, the air inlet channel 103 and the air outlet channel 104 are directly arranged through the annular cap 40 and its extended annular limiting flange 402, allowing external pipelines to communicate directly with the air chamber 101 through the ferrule or threaded pipe connector 60 installed at the port of the annular cap 40, via the channel inside the annular limiting flange 402. In addition, to optimize gas replacement efficiency, the gas outlet channel 104 is connected to a guide pipe 30 inside the gas chamber 101. The guide pipe 30 extends all the way to the bottom area of ​​the gas chamber 101 to ensure that the stale gas in the gas chamber 101 can be fully discharged.

[0072] To meet the requirements of vacuum or pressure conditions, the detector 20 itself adopts a pressure-resistant and pressure-balanced design. The housing of the detector 20 is assembled axially by stacking a first housing 201, a second housing 202, and a third housing 203. The first housing 201 and the third housing 203 are fitted together by a stepped shoulder and clamped with a fourth sealing ring 504, forming an outer protective shell. The second housing 202 is encapsulated in the internal cavity 206. The bottom end of the third housing 203 is the detection end, and the detection surface 204 is located in its middle. To prevent pressure changes (such as vacuuming) in the gas chamber 101 from causing deformation and damage to the detection surface 204, at least one through-hole penetrating the wall is opened on the detection end face of the third housing 203. This through-hole is located on the periphery of the detection surface 204. This pressure-balancing structure 205 ensures that the internal cavity 206 of the detector 20 and the gas chamber 101 are always in pressure communication, eliminating the pressure difference between the inside and outside of the detection surface 204. In addition, the internal electrical signal transmission is achieved through a conductive connector that runs through the second housing 202. One end of the connector is connected to the bottom signal source, and the other end is led out to the electrode interface at the top of the first housing 201, ensuring signal integrity under the multi-layer sealed structure.

[0073] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims, and the foregoing embodiments should be considered exemplary and non-limiting.

Claims

1. A radioactive gas measuring device, characterized in that, include: The chamber body has an internal chamber for containing the gas to be measured, and the chamber body has an installation port that communicates with the gas chamber. The detector is installed at the mounting port, with its detection surface facing the inside of the air chamber, and the detector blocks the mounting port to form a sealed boundary of the air chamber. The chamber body or detector is equipped with an air inlet channel and an air outlet channel that are connected to the air chamber.

2. The radioactive gas measuring device according to claim 1, characterized in that, The inner wall of the mounting port is provided with a support step that protrudes inward. The detector extends at least partially into the mounting port and abuts against the support step axially. A first sealing ring is sandwiched between the mating surfaces of the detector and the supporting step to form a first-level sealing structure.

3. The radioactive gas measuring device according to claim 2, characterized in that, The air intake and exhaust channels are located within the supporting steps, or on the peripheral wall of the detector. The intake and exhaust channels are arranged radially opposite each other.

4. The radioactive gas measuring device according to claim 1, characterized in that, Also includes: The guide tube connects to the air outlet channel at one end and extends to the bottom area of ​​the air chamber at the other end.

5. The radioactive gas measuring device according to claim 1, characterized in that, Also includes: An annular pressure cap is fitted around the periphery of the detector and is detachably connected to the chamber body; The annular cover is pressed onto the end face of the detector away from the air chamber, and a second sealing ring is provided between the annular cover and the detector, and a third sealing ring is provided between the annular cover and the chamber body. The second and third sealing rings are coaxially arranged.

6. The radioactive gas measuring device according to claim 5, characterized in that, Both the air intake and exhaust channels extend and pass through the annular pressure cover. The air intake and air outlet channels are respectively equipped with pipe fittings at the ports of the annular cover. The pipe fittings are fixed to the annular cover by a threaded connection structure or a compression fitting structure.

7. The radioactive gas measuring device according to claim 5, characterized in that, An annular gap is formed between the detector located in the mounting port and the inner wall of the mounting port. An annular limiting flange is axially protruding on the side of the annular cover facing the air chamber. The annular limiting flange is embedded in the annular gap to radially position the detector.

8. The radioactive gas measuring device according to claim 1, characterized in that, The detector is constructed with a pressure balancing structure to maintain pressure balance on both the inner and outer sides of the detector's detection surface.

9. The radioactive gas measuring device according to any one of claims 1 to 8, characterized in that, The detector includes a first housing, a second housing, and a third housing stacked along the axial direction; the first housing and the third housing are connected by a stepped shoulder to form the housing of the detector, and the second housing is located in the internal cavity of the housing of the detector. A fourth sealing ring is provided at the mating step between the first and third housings.

10. The radioactive gas measuring device according to claim 9, characterized in that, The end of the third housing that faces away from the first housing is the detection end, and the detection surface is located in the middle of the detection end; The pressure balancing structure consists of at least one through hole on the end face of the detection end of the third housing. The through hole is located on the periphery of the detection surface and penetrates the wall of the third housing, so that the internal cavity of the detector housing is in pressure communication with the air chamber.

Images