A portable, real-time high-activity-concentration gaseous radon source production device

Abstract

This utility model discloses a portable, real-time high-activity-concentration gaseous radon source production device, which solves the problems of low integration and high cost of existing radon source production devices, and the inability to meet the needs of gaseous radon source preparation and continuous supply. Specifically, it includes a subsurface gas drill pipe sampler, a front-end dust filter, an air compressor, a buffer tank, a water phase separator, and a hollow fiber membrane module connected sequentially from the input end to the output end through a pipeline. The subsurface gas drill pipe sampler is used to obtain a radon-containing gas source from underground. The front-end dust filter is used to filter dust from the gas source obtained by the subsurface gas drill pipe sampler. The air compressor is used to pressurize the gas source in the pipeline. The buffer tank is used to settle dust and moisture in the high-pressure gas source, while ensuring that the high-pressure gas source outputs at a constant pressure, forming a constant-pressure gas source. The water phase separator is used to further separate and remove moisture from the constant-pressure gas source. The hollow fiber membrane module is used to separate impurity gases from the constant-pressure gas source.

Description

Technical Field

[0001] This utility model relates to a radon source production device, specifically a portable, real-time high-activity-concentration gaseous radon source production device. Background Technology

[0002] Radon, a naturally occurring radioactive inert gas, is a key intermediate product in the decay chain of uranium-series radionuclides and has irreplaceable applications in fields such as nuclear radiation detection and calibration, the establishment of radiometric standards, geological exploration, and medicine. Currently, the preparation of commercial radon sources generally uses radium ( 226 Ra) is the parent nuclide, utilizing 226 Ra decays into radon via α decay. 222 Radon is continuously produced through the nuclear decay properties of Rn.

[0003] In the specific preparation process, a dedicated control device is needed to regulate the decay environment and collection efficiency, sealing radon gas to achieve the target activity concentration within a sealed container of a specific volume. This sealed container is commonly referred to as a radon chamber, which is subsequently used to provide a stable radon source. However, existing radon source preparation and storage devices have significant drawbacks: First, the overall equipment has low integration; the core components and protective structures result in a large and heavy device, leading to high purchase costs and extremely poor mobility, making it difficult to adapt to the needs of field operations or multi-point detection scenarios. Second, the device design focuses on static storage, lacking dynamic airflow control and output mechanisms, thus failing to meet the requirements for the preparation and continuous supply of gaseous radon sources. Third... 226 Ra sources are highly radioactive, and the sealing structure and protective design of the device have limitations. During long-term storage, transportation and maintenance, there is a risk of radioactive leakage, which poses a potential threat to the health of operators and the safety of the environment. Utility Model Content

[0004] To address the technical problems of existing radon source production devices having low integration and high cost, failing to meet the requirements for the preparation and continuous supply of gaseous radon sources, and posing potential threats to the health of operators and environmental safety, this utility model provides a portable, real-time, high-activity-concentration gaseous radon source production device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A portable, real-time high-activity-concentration radon gaseous source production device, characterized by:

[0007] It includes a subsurface gas drill pipe sampler, a front-end dust filter, an air compressor, a buffer tank, a water phase separator, and a hollow fiber membrane module, which are connected sequentially from the input end to the output end through pipelines.

[0008] The subsurface gas drill pipe sampler is used to obtain a radon-containing gas source from beneath the surface;

[0009] The front-end dust filter is used to filter dust from the gas source obtained by the underground gas drill pipe sampler.

[0010] The air compressor is used to pressurize the air source in the pipeline, so that the air source after dust filtration becomes a high-pressure air source, which is convenient for subsequent transportation.

[0011] The buffer tank is used to settle dust and moisture in the high-pressure air source, while ensuring that the high-pressure air source outputs at a constant pressure, thus forming a constant-pressure air source.

[0012] The water phase separator is used to further separate and remove moisture from the constant pressure gas source;

[0013] The hollow fiber membrane module is used to separate impurity gases from a constant pressure gas source, and a first valve is provided on its output pipe.

[0014] Furthermore, it also includes duct dust filters;

[0015] The pipeline dust filter is installed on the pipeline between the water phase separator and the hollow fiber membrane module.

[0016] Furthermore, it also includes a first mass flow controller;

[0017] The first mass flow controller is installed on the pipeline between the pipeline dust filter and the hollow fiber membrane module.

[0018] Furthermore, it also includes a second mass flow controller;

[0019] The second mass flow controller is located on the pipeline between the hollow fiber membrane module and the first valve.

[0020] Furthermore, it also includes a first pressure sensor.

[0021] The first pressure sensor is installed on the pipe between the first mass flow controller and the hollow fiber membrane module.

[0022] Furthermore, it also includes a second pressure sensor;

[0023] The second pressure sensor is installed on the pipe between the hollow fiber membrane module and the second mass flow controller.

[0024] Furthermore, it also includes a second valve;

[0025] One end of the second valve is connected to the pipe between the first mass flow controller and the first pressure sensor, and the other end is used for venting.

[0026] The buffer tank is equipped with a drain valve;

[0027] The first valve, the second valve, and the drain valve are all solenoid valves.

[0028] Furthermore, it also includes control mechanisms;

[0029] The air compressor, the first valve, the second valve and the drain valve, the first pressure sensor, the second pressure sensor, the first mass flow controller and the second mass flow controller are all electrically connected to the control mechanism.

[0030] Furthermore, it also includes the outer casing;

[0031] The outer casing has openwork sections on each side wall and is equipped with a fan.

[0032] The front-end dust filter, air compressor, buffer tank, water phase separator, hollow fiber membrane module, pipeline dust filter, first mass flow controller, second mass flow controller, first pressure sensor, second pressure sensor, first valve, second valve, drain valve, and control mechanism are all housed within the outer casing.

[0033] Furthermore, the hollow fiber membrane module includes a plurality of hollow fiber membrane columns connected in series.

[0034] The beneficial effects of this utility model are:

[0035] 1. The present invention provides a portable real-time high activity concentration airflow radon source production device, which achieves real-time enrichment of radon gas by connecting the following components in sequence: underground gas drill rod sampler, front-end dust filter, air compressor, buffer tank, water phase separator and hollow fiber membrane module. It can directly provide a continuous airflow radon source with strong timeliness, and has few modules, simple structure and is easy to carry.

[0036] 2. This utility model provides a portable, real-time high-activity-concentration radon gas source production device. It is equipped with a control mechanism, connecting an air compressor, valves, and a mass flow controller to the control mechanism. It is plug-and-play, easy to operate and maintain, requires no lead container, is lightweight (less than 50kg), and has strong field adaptability. It provides a platform for radon research in the environment and can be used for measuring low radon activity concentrations in the environment, reducing radon in small areas, and calibrating related radioactive measurement equipment. It features low cost, high portability, and high safety performance, meeting the measurement and calibration needs of different locations and devices. It replaces radon chambers that are costly, bulky, and use radioactive radium sources, and has promising market application prospects.

[0037] 3. This utility model provides a portable, real-time high-activity-concentration gaseous radon source production device. Without using other radioactive sources, it separates and removes a large number of other impurity components (O2, N2, CO2, and H2O) in the gas, greatly reducing the volume. The concentration of radon components in the small volume sample is significantly increased, realizing the real-time concentration and enrichment of low-level radioactive radon samples to prepare a high-activity-concentration gaseous radon source. It can provide a radon activity concentration on the order of 10,000 becquerels, providing a radon production scheme for related scientific research. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of an embodiment of a portable, real-time high-activity-concentration radon gas source production device according to the present invention.

[0039] Icon labels:

[0040] 1-Subsurface gas drill pipe sampler, 2-Front-end dust filter, 3-Air compressor, 4-Buffer tank, 5-Water phase separator, 6-Hollow fiber membrane module, 7-Pipeline dust filter, 8-First mass flow controller, 9-Second mass flow controller, 10-First pressure sensor, 11-Second pressure sensor, 12-First valve, 13-Second valve, 14-Drain valve, 15- Detailed Implementation

[0041] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] This utility model provides a portable, real-time high-activity-concentration gaseous radon source production device for producing and providing gaseous radon sources in a laboratory or field.

[0043] like Figure 1 As shown, the device includes a subsurface gas drill pipe sampler 1, a front-end dust filter 2, an air compressor 3, a buffer tank 4, a water phase separator 5, a pipeline dust filter 7, a first mass flow controller 8, a hollow fiber membrane module 6, and a second mass flow controller 9, which are connected sequentially from the input end to the output end through a pipeline; it also includes a control mechanism 15.

[0044] The subsurface gas drill pipe sampler 1 is used to obtain a radon-containing gas source from beneath the surface.

[0045] The front-end dust filter 2 is used to filter dust from the gas source obtained by the underground gas drill pipe sampler 1.

[0046] Air compressor 3 is used to pressurize the air source after dust filtration to form a high-pressure air source, which is convenient for subsequent transportation.

[0047] The buffer tank 4 is used to settle the dust and moisture in the high-pressure air source, and at the same time, it enables the high-pressure air source to output at a constant pressure, forming a constant pressure air source; the buffer tank 4 is equipped with a drain valve 14.

[0048] Water phase separator 5 is used to further separate and remove moisture from the constant pressure gas source.

[0049] The duct dust filter 7 is used for further dust filtration.

[0050] The first mass flow controller 8 is used to control the flow rate of the constant pressure gas so that the hollow fiber membrane module 6 can better absorb impurity gases.

[0051] A first pressure sensor 10 and a second valve 13 are installed on the pipeline between the first mass flow controller 8 and the hollow fiber membrane module 6.

[0052] The hollow fiber membrane module 6 is used to separate impurity gases (O2, N2, CO2 and H2O) in a constant pressure gas source, and a first valve 12 is provided on its output pipe; the hollow fiber membrane module 6 includes multiple hollow fiber membrane columns connected in series, and in this embodiment, four hollow fiber membrane columns are connected in series.

[0053] A second pressure sensor 11 and a second mass flow controller 9 are also provided on the pipeline between the hollow fiber membrane module 6 and the first valve 12; the second pressure sensor 11 is located on the pipeline between the hollow fiber membrane module 6 and the second mass flow controller 9.

[0054] The first valve 12, the second valve 13, and the drain valve 14 are all solenoid valves.

[0055] Air compressor 3, first valve 12, second valve 13 and drain valve 14, first pressure sensor 10, second pressure sensor 11, first mass flow controller 8 and second mass flow controller 9 are all electrically connected to control mechanism 15.

[0056] Except for the 1kW battery, which is a separate module, all other components of the production unit are integrated into a single outer casing.

[0057] The front-end dust filter 2, air compressor 3, buffer tank 4, water phase separator 5, hollow fiber membrane module 6, pipeline dust filter 7, first mass flow controller 8, second mass flow controller 9, first pressure sensor 10, second pressure sensor 11, first valve 12, second valve 13, drain valve 14, and control mechanism 15 are all housed in the outer casing. Each side wall of the outer casing is perforated. A fan is installed on each of the four sides of the outer casing and is also perforated. A monitor and printer can also be installed on the front panel of the outer casing.

[0058] The production method using the aforementioned portable real-time high-activity-concentration radon gas source production device includes the following steps:

[0059] Step 1: Obtain a radon-containing gas source from underground using the underground gas drill pipe sampler 1;

[0060] Step 2: Filter the radon-containing gas source through the front-end dust filter 2;

[0061] Step 3: Pressurize the air source after dust filtration using air compressor 3 to form a high-pressure air source;

[0062] Step 4: The dust and moisture in the high-pressure air source are settled by the buffer tank 4, while the high-pressure air source is output at constant pressure to form a constant pressure air source.

[0063] Step 5: The water in the constant pressure gas source is separated and removed again by the water phase separator 5, and then the constant pressure gas source is filtered for dust by the pipeline dust filter 7, and then the first mass flow controller 8 controls the output at the first preset flow rate; the range of the first preset flow rate is 2.0L / min~3.2L / min, and it is set to 2.5L / min in this embodiment;

[0064] Step 6: The impurity gases (O2, N2, CO2 and H2O) in the constant pressure gas source are separated by the hollow fiber membrane module 6 and discharged from the membrane module as permeate gas. The flow rate and volume of the remaining product gas flow after the membrane are greatly reduced, and the radon component is enriched, that is, a high activity concentration gas radon source is obtained, which is then output for use at a flow rate of 2.0 L / min through the second mass flow controller.

[0065] The core technology in this embodiment is hollow fiber membrane separation technology. The basic principle of hollow fiber membrane separation is that, under pressure, the different components in a mixed gas permeate through the membrane at different rates, achieving component separation. After the gas passes through the hollow fiber membrane, the feed gas flow rate or volume (F...)... F or V F ) equals permeate (F) E or V E ) and product gas (F P or V P The sum of the two is (F) F =F P +F E or V F =V P +V E The ratio of product gas flow rate to feed gas volume is defined as the membrane enrichment factor (E). m The calculation formula is:

[0066]

[0067] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A portable, real-time high-activity-concentration radon gaseous source production device, characterized in that: It includes a subsurface gas drill pipe sampler (1), a front-end dust filter (2), an air compressor (3), a buffer tank (4), a water phase separator (5), and a hollow fiber membrane module (6), which are connected sequentially from the input end to the output end through a pipeline. The subsurface gas drill pipe sampler (1) is used to obtain a gas source containing radon from below the surface; The front-end dust filter (2) is used to filter dust from the gas source obtained by the underground gas drill pipe sampler (1); The air compressor (3) is used to pressurize the air source in the pipeline, so that the air source after filtering dust becomes a high-pressure air source, which is convenient for subsequent transportation. The buffer tank (4) is used to settle the dust and moisture in the high-pressure gas source, and at the same time, the high-pressure gas source outputs at a constant pressure to form a constant pressure gas source. The water phase separator (5) is used to further separate and remove moisture from the constant pressure gas source; The hollow fiber membrane module (6) is used to separate impurity gases in a constant pressure gas source, and a first valve (12) is provided on its output pipe.

2. The production device for a portable, real-time high-activity-concentration radon gas source according to claim 1, characterized in that: It also includes a duct dust filter (7); The pipeline dust filter (7) is installed on the pipeline between the water phase separator (5) and the hollow fiber membrane module (6).

3. The production device for a portable, real-time high-activity-concentration radon gas source according to claim 1 or 2, characterized in that: It also includes a first mass flow controller (8); The first mass flow controller (8) is installed on the pipeline between the pipeline dust filter (7) and the hollow fiber membrane module (6).

4. The production device for a portable, real-time high-activity-concentration radon gas source according to claim 3, characterized in that: It also includes a second mass flow controller (9); The second mass flow controller (9) is located on the pipeline between the hollow fiber membrane module (6) and the first valve (12).

5. The production device for a portable, real-time high-activity-concentration radon gas source according to claim 4, characterized in that: It also includes a first pressure sensor (10). The first pressure sensor (10) is installed on the pipe between the first mass flow controller (8) and the hollow fiber membrane module (6).

6. The production device for a portable, real-time high-activity-concentration radon gas source according to claim 5, characterized in that: It also includes a second pressure sensor (11); The second pressure sensor (11) is installed on the pipe between the hollow fiber membrane module (6) and the second mass flow controller (9).

7. The production device for a portable, real-time high-activity-concentration radon gas source according to claim 6, characterized in that: It also includes a second valve (13); One end of the second valve (13) is connected to the pipe between the first mass flow controller (8) and the first pressure sensor (10), and the other end is used for venting. The buffer tank (4) is equipped with a drain valve (14); The first valve (12), the second valve (13), and the drain valve (14) are all solenoid valves.

8. The production device for a portable, real-time high-activity-concentration radon gas source according to claim 7, characterized in that: It also includes a control mechanism (15); The air compressor (3), the first valve (12), the second valve (13), the drain valve (14), the first pressure sensor (10), the second pressure sensor (11), the first mass flow controller (8), and the second mass flow controller (9) are all electrically connected to the control mechanism (15).

9. The production device for a portable, real-time high-activity-concentration gaseous radon source according to claim 8, characterized in that: It also includes the outer casing; The outer casing has openwork sections on each side wall and is equipped with a fan. The front-end dust filter (2), air compressor (3), buffer tank (4), water phase separator (5), hollow fiber membrane module (6), pipeline dust filter (7), first mass flow controller (8), second mass flow controller (9), first pressure sensor (10), second pressure sensor (11), first valve (12), second valve (13), drain valve (14), and control mechanism (15) are all installed inside the outer casing.

10. The production device for a portable, real-time high-activity-concentration gaseous radon source according to claim 9, characterized in that: The hollow fiber membrane module (6) includes a plurality of hollow fiber membrane columns connected in series.

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