Device for measuring radon blocking efficiency of radon-proof coating

Abstract

A device for measuring radon resistance efficiency of an anti-radon coating relates to the technical field of radioactive contamination protection material testing and comprises a source item side chamber and a protection side chamber which are isolated from each other, a clamping structure used for fixing the anti-radon coating is arranged between the source item side chamber and the protection side chamber, the bottom of the source item side chamber is communicated with a box body, a static radon source is arranged in the box body, and the static radon source is communicated with the protection side chamber. The box body is further connected with a radon source supply system used for dynamically inputting a flow gas type radon source, a valve used for blocking the radon source is arranged in the source item side cavity, a top cover is arranged at the top of the protection side cavity, and the protection side cavity is provided with an air inlet and an air outlet which are used for being communicated with a radon measuring instrument. According to the utility model, the problems of slow concentration establishment and difficult decay compensation caused by dependence on a single radon source in a traditional testing device are solved, the testing efficiency can be greatly improved, radon natural decay and cavity micro-leakage loss can be compensated in real time, the concentration fluctuation of a source item side in a single measurement period is ensured to be in a relatively low range, and the measurement accuracy is improved. And the radon blocking efficiency calculation result is more reliable.

Description

Technical Field

[0001] This utility model relates to the field of testing technology for radioactive pollution protection materials, and in particular to a device for measuring the radon blocking efficiency of radon-resistant coatings. Background Technology

[0002] As a key material for blocking radon gas penetration in building walls, the accurate measurement of radon-blocking efficiency of radon-blocking coatings directly affects the evaluation of their protective performance. Currently, the industry generally designs testing devices based on international standards (such as ISO 11665-7). This involves placing the coating sample between a separated "source side" (high-concentration radon gas zone) and a "protective side" (low-concentration monitoring zone), and calculating the coating's radon-blocking efficiency using the concentration difference between the two sides. Such devices typically use a static solid radon source (such as radium-226) to naturally release radon gas, and measurements are taken after the concentration has reached equilibrium.

[0003] However, existing testing devices have significant drawbacks: 1. Low concentration establishment efficiency: Relying on the natural release mechanism of static radon sources, it takes too long to reach the target concentration at the source term (usually several days to several weeks), which severely restricts the testing efficiency of multiple batches of samples; 2. Poor concentration stability: Radon has a short half-life (only 3.8 days), and during the measurement process, due to natural decay, micro-leakage in the cavity, and fluctuations in ambient temperature and humidity, it is difficult to maintain a stable initial concentration, resulting in distorted radon blocking efficiency calculation results; 3. Weak anti-interference ability: Changes in temperature and humidity may affect radon diffusion behavior and coating microstructure, but existing devices lack a dynamic compensation mechanism and cannot effectively isolate environmental factors from interfering with measurement accuracy.

[0004] The aforementioned problems make it difficult for traditional devices to meet the requirements of high-precision and high-efficiency radon blocking efficiency testing, especially restricting the rapid screening and performance comparison studies of new materials. Therefore, there is an urgent need for a measurement device that can quickly establish a stable radon concentration and is resistant to environmental interference, in order to improve the reliability and timeliness of radon blocking efficiency testing. Utility Model Content

[0005] The purpose of this invention is to provide a device for measuring the radon blocking efficiency of an anti-radon coating, addressing the problems mentioned in the background section.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a radon-blocking efficiency measuring device for an anti-radon coating, comprising a source-side chamber and a protective-side chamber isolated from each other, wherein a clamping structure for fixing the anti-radon coating is provided between the source-side chamber and the protective-side chamber, a box body is connected to the bottom of the source-side chamber, a static radon source is provided inside the box body, and the box body is also connected to a radon source supply system for dynamically inputting a flow-type radon source, a valve for blocking the radon source is provided inside the source-side chamber, a top cover is provided on the top of the protective-side chamber, and an air inlet and an air outlet for connecting to a radon meter are provided in the protective-side chamber.

[0007] Preferably, the radon source supply system includes an external radon source device, a vacuum pump connected to the external radon source device, and a gas-flow radon source inlet and a gas-flow radon source outlet respectively disposed on both sides of the housing and connected to the vacuum pump.

[0008] More preferably, the housing is provided with multiple test units consisting of source term side chambers and protection side chambers, and the housing is connected to the source term side chambers of each test unit.

[0009] More preferably, the top cover is connected to a cylinder, and a bracket for fixing the cylinder is installed on the outside of the protective side chamber.

[0010] More preferably, a hanging beam is also connected to the middle of the box body.

[0011] More preferably, the clamping structure includes annular support plates respectively disposed on the inner periphery of the top of the source side chamber and the inner periphery of the bottom of the protective side chamber, the radon-proof coating being clamped between the upper and lower annular support plates, and flanges correspondingly disposed on the outer periphery of the source side chamber and the protective side chamber, with fastening bolts passing through the upper and lower flanges.

[0012] More preferably, a placement hole is provided in the middle of the box, and a sealing cover is installed in the placement hole. A static radon source is connected to the inner top surface of the sealing cover through a hanging rail. When the sealing cover is sealed in the placement hole, the hanging rail can be extended into the box so that the static radon source is in a suspended state.

[0013] More preferably, the enclosure is also connected to a thermometer and a differential pressure gauge.

[0014] More preferably, a handle is also provided on one side of the box.

[0015] More preferably, it also includes a constant temperature and humidity chamber for maintaining a preset temperature and humidity in the protective side chamber when the top cover is open.

[0016] Compared with existing technologies, this invention solves the problems of slow concentration build-up and difficult decay compensation caused by traditional testing devices relying on a single radon source by using a dual configuration of a static radon source housing and a gas-flow radon source supply system. The static radon source provides basic radon gas release, while the gas-flow radon source can dynamically input high-concentration radon gas. This not only allows the source-side chamber to quickly reach the target concentration at the beginning of the test, greatly improving testing efficiency, but also compensates for radon natural decay and chamber micro-leakage losses in real time, ensuring that the source-side concentration fluctuation is within a low range within a single measurement cycle, making the radon blocking efficiency calculation results more reliable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure in the embodiment;

[0018] Figure 2for Figure 1 Schematic diagram of the CC-direction cross-section structure in the middle;

[0019] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the diagram;

[0020] Figure 4 This is a top view of the overall structure in the embodiment;

[0021] Figure 5 for Figure 4 A schematic diagram of a partial cross-sectional structure along the BB direction.

[0022] In the picture:

[0023] 1 – Source side chamber; 2 – Protective side chamber; 3 – Radon-resistant coating

[0024] 4—Box body; 5—Static radon source; 6—Valve

[0025] 7 – Top cover; 8 – Flow-type radon source inlet; 9 – Flow-type radon source outlet.

[0026] 10 - Cylinder 11 - Bracket 12 - Suspension Beam

[0027] 13 – Annular support plate 14 – Fastening bolt 15 – Placement hole

[0028] 16 - Sealing cap 17 - Hanging rail 18 - Handle Detailed Implementation

[0029] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0030] It should be noted in advance that, in this utility model, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, in this utility model, unless otherwise explicitly specified and limited, "on" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features not in direct contact but through another feature between them.

[0031] like Figure 1 and Figure 2 as well as Figure 4As shown, the radon-blocking efficiency measuring device for the radon-blocking coating includes a source-side chamber 1 and a protective-side chamber 2 that are isolated from each other. A clamping structure for fixing the radon-blocking coating 3 is provided between the source-side chamber 1 and the protective-side chamber 2. The bottom of the source-side chamber 1 is connected to a housing 4, and a static radon source 5 is provided inside the housing 4. The housing 4 is also connected to a radon source supply system for dynamically inputting a flow-type radon source. A valve 6 for blocking the radon source is provided inside the source-side chamber 1. A top cover 7 is provided on the top of the protective-side chamber 2. The protective-side chamber 2 is provided with an air inlet and an air outlet for connecting to the radon meter.

[0032] In the above structure, the radon source supply system includes an external radon source device, a vacuum pump connected to the external radon source device, and a gas-flow radon source inlet 8 and a gas-flow radon source outlet 9 respectively located on both sides of the housing 4 and connected to the vacuum pump.

[0033] In this embodiment, the housing 4 is equipped with multiple test units consisting of source-side chambers 1 and protection-side chambers 2. The housing 4 connects the source-side chambers 1 of each test unit, achieving high efficiency in parallel testing of multiple samples and consistency in radon source supply. The housing 4 serves as a centralized containment space for the static radon source 5, while also providing a radon diffusion basis for multiple test units, avoiding the need for a separate radon source chamber for each unit and significantly reducing the overall size of the device. This allows multiple sets of coating samples to be tested simultaneously in a single experiment, significantly improving the data output efficiency of radon blocking efficiency testing.

[0034] In addition, the top cover 7 is connected to the cylinder 10, and the outside of the protective side chamber 2 is equipped with a bracket 11 for fixing the cylinder 10.

[0035] Preferably, a hanging beam 12 is also connected to the middle of the box body 4 to facilitate carrying the device and moving it.

[0036] like Figure 3 As shown, the clamping structure includes annular support plates 13 respectively disposed on the inner periphery of the top of the source-side chamber 1 and the inner periphery of the bottom of the protective-side chamber 2. The radon-proof coating 3 is clamped between the upper and lower annular support plates 13. Flanges are respectively provided on the outer periphery of the source-side chamber 1 and the protective-side chamber 2, and fastening bolts 14 pass through the upper and lower flanges. The annular support plates 13 precisely support the edge of the coating, and with the uniform pressure applied by the flange bolts, a continuous annular sealing surface is formed, completely blocking the path of radon gas leakage from the clamping gap. In addition, those skilled in the art should know that the radon-proof coating 3 is actually a film-like structure, and therefore can be clamped. Loosening the fastening bolts 14 allows the chamber to be separated for coating replacement without the need for complete disassembly of the device.

[0037] In this embodiment, a placement hole 15 is provided in the middle of the housing 4, and a sealing cover 16 is installed in the placement hole 15. The inner top surface of the sealing cover 16 is connected to a static radon source 5 through a hanging rail 17. When the sealing cover 16 is sealed in the placement hole 15, the hanging rail 17 can extend into the housing 4 so that the static radon source 5 is in a suspended state (e.g., Figure 5 (As shown). This structural design prevents the static radon source 5 from contacting the bottom of the chamber, thus preventing radon source corrosion or pollution diffusion. By opening the sealing cover 16, the lifting rail 17 and the entire radon source can be lifted out of the chamber 4, resulting in a short source replacement operation time and a significantly reduced risk of radiation exposure.

[0038] In addition, the box 4 is also connected to a thermometer and a differential pressure gauge. A handle 18 is also provided on one side of the box 4.

[0039] This implementation also includes a constant temperature and humidity chamber. During the testing phase, the chamber 4, which is equipped with four testing units, can be placed in the constant temperature and humidity chamber. When the top cover 7 is opened, the protective side chamber 2 can maintain the preset temperature and humidity.

[0040] The testing procedure using the radon-blocking efficiency measuring device for the radon-blocking coating provided in the above embodiments is roughly as follows:

[0041] Step 1: Unfasten the bolts 14 between the source side chamber 1 and the protection side chamber 2, separate the upper and lower flanges, place the radon-resistant coating 3 to be tested between the annular support plates 13, ensuring that the edge of the coating completely covers the sealing surface, and retighten the bolts 14 to make the coating evenly compressed and sealed. Install the static radon source 5 through the placement hole 15: Open the sealing cover 16, suspend the radon source connected to the hanging rail 17 in the center of the box 4, and close the sealing cover 16 to ensure airtightness.

[0042] Step 2: Close all valves 6, place the entire chamber 4 into the constant temperature and humidity chamber, and connect the corresponding pipes. Turn on the vacuum pump and inject high-concentration radon gas into the chamber 4 through the gas flow radon source inlet 8. The gas is circulated out from the gas flow radon source outlet 9 to dynamically maintain the radon concentration inside the chamber 4. Monitor the thermometer and differential pressure gauge connected to the chamber 4. Once the radon concentration in the source-side chamber 1 stabilizes to the preset value, open valve 6 to allow the radon gas to diffuse into the source-side chamber 1.

[0043] Step 3: Control the top cover 7 to open using cylinder 10, so that the protective side chamber 2 is exposed to the preset temperature and humidity environment, and close the constant temperature and humidity chamber door.

[0044] Step 4: After a period of time, close the top cover 7 and let it stand for 24 hours to allow the radon concentration on the protective side to equalize. Connect the radon meter to the inlet and outlet of the protective side chamber 2, turn on the radon meter (such as RAD7), and directly measure the radon concentration C on the protective side. p Based on the preset concentration C on the source term side s Calculate radon blocking efficiency:

[0045]

[0046] This invention achieves rapid establishment and short-term high-precision maintenance of radon concentration in the source-side chamber 1 by combining the basic release of static radon source 5 within the chamber 4 with the dynamic injection of radon gas through the gas-flow radon source supply system 2. This effectively overcomes the interference of natural radon decay on single tests. The chamber 4 integrates multiple parallel testing units, sharing the radon source supply system 2 and the temperature and humidity monitoring module 8. Combined with the flange sealing structure of the annular support plate 3, it achieves simultaneous radon blocking efficiency measurement for multiple samples while completely blocking lateral radon leakage, significantly improving test throughput and material screening efficiency.

[0047] To facilitate understanding by those skilled in the art of the improvements of this utility model compared to the prior art, some of the accompanying drawings and descriptions of this utility model have been simplified. The above embodiments are preferred implementations of this utility model. In addition, this utility model can be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A device for measuring the radon blocking efficiency of an anti-radon coating, comprising a source-side chamber (1) and a protective-side chamber (2) isolated from each other, wherein a clamping structure for fixing an anti-radon coating (3) is provided between the source-side chamber (1) and the protective-side chamber (2), characterized in that: The bottom of the source-side chamber (1) is connected to a box (4), a static radon source (5) is provided inside the box (4), and the box (4) is also connected to a radon source supply system for dynamically inputting a flow-type radon source. A valve (6) for blocking the radon source is provided inside the source-side chamber (1). A top cover (7) is provided on the top of the protective side chamber (2). The protective side chamber (2) is provided with an air inlet and an air outlet for connecting the radon meter.

2. The radon barrier efficiency measurement apparatus of claim 1, wherein: The radon source supply system includes an external radon source device, a vacuum pump connected to the external radon source device, and a gas-flow radon source inlet (8) and a gas-flow radon source outlet (9) respectively located on both sides of the housing (4) and connected to the vacuum pump.

3. The radon barrier efficiency measurement apparatus of claim 1, wherein: The housing (4) is provided with multiple test units consisting of a source term side chamber (1) and a protection side chamber (2), and the housing (4) is connected to the source term side chamber (1) of each test unit.

4. The radon barrier efficiency measurement apparatus of claim 1, wherein: The top cover (7) is connected to a cylinder (10), and a bracket (11) for fixing the cylinder (10) is installed on the outside of the protective side chamber (2).

5. The radon barrier efficiency measurement apparatus of claim 1, wherein: The middle part of the box (4) is also connected to a hanging beam (12).

6. The radon barrier efficiency measurement apparatus of claim 1, wherein: The clamping structure includes annular support plates (13) respectively disposed on the inner periphery of the top of the source side chamber (1) and the inner periphery of the bottom of the protective side chamber (2). The radon-proof coating (3) is clamped between the upper and lower annular support plates (13). The outer periphery of the source side chamber (1) and the protective side chamber (2) are respectively provided with corresponding flanges, and fastening bolts (14) are passed through the upper and lower flanges.

7. The radon barrier efficiency measurement apparatus of claim 1, wherein: The box (4) is provided with a placement hole (15) in the middle. A sealing cover (16) is installed in the placement hole (15). The inner top surface of the sealing cover (16) is connected to a static radon source (5) through a hanging rail (17). When the sealing cover (16) is sealed in the placement hole (15), the hanging rail (17) can be extended into the box (4) so ​​that the static radon source (5) is in a suspended state.

8. The radon barrier efficiency measurement apparatus of claim 1, wherein: The box (4) is also connected to a thermometer and a differential pressure gauge.

9. The radon barrier efficiency measurement apparatus of claim 1, wherein: A handle (18) is also provided on one side of the box (4).

10. The radon barrier efficiency measurement apparatus of claim 1, wherein: It also includes a constant temperature and humidity chamber for maintaining a preset temperature and humidity in the protective side chamber (2) when the top cover (7) is open.

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