Collecting device and detecting system for carbon-14 and tritium

Abstract

The utility model discloses a collection device and a detection system for carbon-14 and tritium. The carbon-14 and tritium collecting device comprises a connecting pipeline which is communicated with an outlet of a tubular combustion device; the first branch pipeline is communicated with the outlet end of the connecting pipeline; the absorption assembly comprises an absorption bottle and a cooling element, the absorption bottle is connected to the first branch pipeline in series, the cooling element is used for cooling the absorption bottle, and the absorption bottle is filled with 3-methoxypropylamine; the number of the second branch pipeline is at least one, and the second branch pipeline and the first branch pipeline are connected to the outlet end of the connecting pipeline in parallel. Therefore, according to the carbon-14 and tritium collecting device provided by the utility model, the air flow is shunted, the difference value between the air flow in the tubular combustion device and the air flow in the carbon dioxide absorption device is reduced, and the collection safety of carbon-14 and tritium is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas collection devices, in particular to a collection device and a detection system for carbon-14 and tritium. Background Art

[0002] Carbon-14 and tritium are both natural radionuclides and important artificial radionuclides, which are derived from nuclear reactions of cosmic rays, operation of nuclear reactors, and nuclear explosion experiments. They are both pure beta-ray radiators. The half-life of carbon-14 is 5730a, the maximum energy is 156keV, and the half-life of tritium is 12.3a, and the maximum energy is 18.6keV. It is reported that the main radionuclides in the nuclear wastewater discharged by Japan are carbon-14 and tritium. Since carbon and hydrogen are important components of the human body, animals and plants, carbon-14 and tritium can easily enter the human body through natural cycles, and continuously produce internal irradiation to the human body. Its beta radiation effect can not only cause ionization of the cell nucleus and damage the body, but also cause single bond breaks in the cell's DNA to cause gene mutations and cause genetic effects. Monitoring carbon-14 and tritium in biological samples is of great significance for timely detection of radioactive contamination and protection of public health.

[0003] Liquid scintillation counting is the most commonly used method for measuring carbon-14 and tritium. Sample pretreatment can achieve the simultaneous collection of tritium and carbon through the tubular combustion method, and then make the sample to be tested for radioactivity measurement using liquid scintillation. At present, in order to meet the measurement requirements of tritium, a relatively large amount of sample needs to be burned, about 20 to 100g, and a lot of carbon dioxide is generated at this time. The gas flow rate in the tubular combustion device and the gas flow rate in the carbon dioxide absorption device are quite different, which reduces the safety of collecting carbon-14 and tritium.

[0004] Therefore, how to improve the safety of collecting carbon-14 and tritium is a technical problem that technicians in this field currently need to solve. Utility Model Content

[0005] In view of this, an object of the present invention is to provide a device for collecting carbon-14 and tritium to improve the safety of the collection process.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A device for collecting carbon-14 and tritium, comprising:

[0008] A connecting pipeline is connected to the outlet of the tubular combustion device;

[0009] A first branch pipeline is connected to the outlet end of the connecting pipeline;

[0010] An absorption assembly, the absorption assembly comprising an absorption bottle connected in series to the first branch pipeline and a cooling element for cooling the absorption bottle, the absorption bottle being filled with 3-methoxypropylamine;

[0011] The number of the second branch pipeline is at least one, and the second branch pipeline and the first branch pipeline are connected in parallel at the outlet end of the connecting pipeline.

[0012] Optionally, in the above-mentioned carbon-14 and tritium collection device, a flow meter is arranged on the first branch pipeline to detect the gas flow in the first branch pipeline.

[0013] Optionally, in the above-mentioned carbon-14 and tritium collection device, a central controller and a control valve are further included, and the control valve is arranged on the first branch pipeline;

[0014] Wherein, the central controller is capable of receiving and storing the flow threshold value in advance, and the flow meter and the control valve are both connected to the central controller by signal;

[0015] Alternatively, the central controller can receive and store the absorption time in advance, the collection device further comprises a timer, and the control valve and the timer are both connected to the central controller signal.

[0016] Optionally, in the above-mentioned carbon-14 and tritium collection device, a buffer bottle and a filter bottle are connected in series on the connecting pipeline, the filter bottle is filled with a filter medium, and the buffer bottle and the filter bottle are arranged in sequence along the air flow direction.

[0017] Optionally, the above-mentioned carbon-14 and tritium collection device further includes a drying element, and the drying element is connected in series to the first branch pipeline.

[0018] Optionally, in the above-mentioned carbon-14 and tritium collection device, a moisture absorption bottle is connected in series on the connecting pipeline, and the moisture absorption bottle is placed in cold hydrazine.

[0019] Optionally, in the above-mentioned carbon-14 and tritium collection device, a gas washing bottle is connected in series to the second branch pipeline, and the gas washing bottle is filled with water.

[0020] Optionally, in the above-mentioned carbon-14 and tritium collection device, a check valve is provided at the inlet end of the first branch pipeline.

[0021] A carbon-14 and tritium detection system comprises a tubular combustion device and the carbon-14 and tritium collection device as described above.

[0022] When using the carbon-14 and tritium collection device provided by the utility model, since the connecting pipeline is connected to the outlet of the tubular combustion device, the first branch pipeline and the second branch pipeline are connected in parallel to the outlet of the connecting pipeline. Therefore, the airflow flowing out of the tubular combustion device will be diverted by the first branch pipeline and the second branch pipeline. After the airflow flowing through the first branch pipeline flows into the absorption bottle, the carbon dioxide is absorbed by 3-methoxypropylamine, and the heat in the absorption process is absorbed by the cooling element to achieve a cooling effect on the collection process. The airflow flowing through the second branch pipeline is discharged from the second branch pipeline. It can be seen that the carbon-14 and tritium collection device provided by the utility model realizes the diversion of the airflow, reduces the difference between the gas flow in the tubular combustion device and the gas flow in the carbon dioxide absorption device, and is beneficial to improving the collection safety of carbon-14 and tritium. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the structure of a carbon-14 and tritium collection device provided in an embodiment of the utility model.

[0025] Among them, 100 is a connecting pipeline, 101 is a buffer bottle, 102 is a filter bottle, 103 is a moisture absorption bottle, 104 is a cold hydrazine, 200 is a first branch pipeline, 201 is a flow meter, 202 is a drying element, 300 is a second branch pipeline, 301 is a washing bottle, 400 is an absorption component, 401 is an absorption bottle, and 402 is a cooling element. DETAILED DESCRIPTION

[0026] It can be seen from the description of the background technology that in order to meet the measurement requirements of tritium, a relatively large amount of sample needs to be burned, about 20 to 100g. At this time, a lot of carbon dioxide is generated, and a large amount of sodium hydroxide lye is required for absorption, which is not conducive to further conversion measurement. If the carbon content of the sample is determined by an elemental analyzer, it is not necessary to absorb all the carbon dioxide generated, and only part of the carbon dioxide is absorbed to meet the measurement requirements. The suspension method requires the carbon dioxide to be absorbed by alkali solution and then converted into calcium carbonate precipitation; the absorption method requires the acid titration of calcium carbonate according to the requirements of GB / T 37865-2019, and then the carbon dioxide is absorbed by 3-methoxypropylamine. Both sample preparation methods are relatively troublesome. If the carbon dioxide produced by the tubular combustion device is directly absorbed by 3-methoxypropylamine, it will be relatively simple. The problem with direct absorption is that 3-methoxypropylamine is easy to volatilize, and the reaction with carbon dioxide is exothermic. It needs to be placed in an ice water bath and the gas flow rate cannot be too fast (10 to 30 mL / min is appropriate). The gas flow rate of the tubular combustion device is 500 to 700 mL / min, and the difference between the two is too large.

[0027] In view of this, the core of the present invention is to provide a collection device for carbon-14 and tritium to reduce the gas flow difference between the tubular combustion device and the collection device.

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] like Figure 1 As shown, an embodiment of the utility model discloses a device for collecting carbon-14 and tritium, including a connecting pipeline 100 , a first branch pipeline 200 , an absorption component 400 and a second branch pipeline 300 .

[0030] Among them, the connecting pipeline 100 is connected to the outlet of the tubular combustion device; the first branch pipeline 200 is connected to the outlet end of the connecting pipeline 100; the absorption component 400 includes an absorption bottle 401 connected in series to the first branch pipeline 200 and a cooling element 402 for cooling the absorption bottle 401, and the absorption bottle 401 is filled with 3-methoxypropylamine; the number of the second branch pipeline 300 is at least one, and the second branch pipeline 300 is connected in parallel with the first branch pipeline 200 at the outlet end of the connecting pipeline 100.

[0031] When using the carbon-14 and tritium collection device provided by the utility model, since the connecting pipeline 100 is connected to the outlet of the tubular combustion device, the first branch pipeline 200 and the second branch pipeline 300 are connected in parallel to the outlet of the connecting pipeline 100. Therefore, the airflow flowing out of the tubular combustion device will be diverted by the first branch pipeline 200 and the second branch pipeline 300. After the airflow flowing through the first branch pipeline 200 flows into the absorption bottle 401, the carbon dioxide is absorbed by 3-methoxypropylamine, and the heat in the absorption process is absorbed by the cooling element 402 to achieve a cooling effect on the collection process. The airflow flowing through the second branch pipeline 300 is discharged from the second branch pipeline 300. It can be seen that the carbon-14 and tritium collection device provided by the utility model realizes the diversion of the airflow, reduces the difference between the gas flow in the tubular combustion device and the gas flow in the carbon dioxide absorption device, and is beneficial to improving the collection safety of carbon-14 and tritium.

[0032] It should be understood that the number of the second branch pipelines 300 can be one, two or more. In practical applications, the number of the second branch pipelines 300 can be adaptively adjusted according to actual needs. As long as the number can meet the use requirements, it belongs to the protection scope of the utility model. Optionally, Figure 1 As shown, in a specific embodiment of the present invention, the number of the second branch pipeline 300 is one.

[0033] In addition, the above-mentioned cooling element 402 can cool the absorption bottle 401 by water bath or air cooling. As long as the cooling method can meet the use requirements, it belongs to the protection scope of the present utility model; optionally, the cooling element 402 provided in the embodiment of the present utility model cools the absorption bottle 401 by ice water bath, which has a higher cooling effect and a simple structure.

[0034] In addition, a flow meter 201 is provided on the first branch pipeline 200 to detect the gas flow in the first branch pipeline 200 and limit the gas flow of the first branch pipeline 200 to a preset flow range, thereby further improving safety.

[0035] Furthermore, the above-mentioned collection device also includes a central controller and a control valve, and the control valve is arranged on the first branch pipeline 200; wherein, the central controller can pre-receive and store the flow threshold, and the flow meter 201 and the control valve are both connected to the central controller signal, so that when the flow meter 201 detects that the air flow in the first branch pipeline 200 exceeds the flow threshold, the central controller reduces the opening of the control valve, thereby reducing the air flow in the first branch pipeline 200, thereby realizing automatic regulation of the air flow in the first branch pipeline 200.

[0036] Alternatively, the central controller can receive and store the absorption time in advance, and the collection device also includes a timer. The control valve and the timer are both connected to the central controller signal to time the collection time through the timer. The timer converts the collection time information into an electrical signal and transmits the electrical signal to the central controller. After the collection process is completed, the control valve is closed by the central controller to realize the automatic opening and closing function of the first branch pipeline 200, thereby improving the degree of automation.

[0037] The above-mentioned signal connection method can be a wired signal connection, a 5G signal connection or a WIFI signal connection, etc. As long as the signal connection method can be met, it falls within the protection scope of the present utility model.

[0038] The above-mentioned connecting pipeline 100 is connected in series with a buffer bottle 101 and a filter bottle 102, which are arranged in sequence along the airflow direction. The filter bottle 102 is filled with a filter medium to filter black powder or other impurities that may be formed by explosion during the combustion process through the filter medium in the filter bottle 102, and the buffer bottle 101 plays a buffering role on the airflow.

[0039] It should be noted that the above-mentioned filter medium can be water, sponge, ion exchange resin and other types of media. As long as the medium can filter impurities, it belongs to the protection scope of the present utility model; optionally, the filter medium provided in the embodiment of the present utility model is water.

[0040] Furthermore, the collection device provided by the present invention also includes a drying element 202, which is connected in series to the first branch pipeline 200 to dry the gas through the drying element 202 to prevent the gas from bringing moisture in the filter bottle 102 into the absorption component 400 when flowing through the filter bottle 102 mentioned above, thereby affecting the accuracy of the carbon dioxide collection result.

[0041] Specifically, in some specific embodiments of the present invention, the drying element 202 is a silica gel drying tube, which is arranged downstream of the flow meter 201 and upstream of the absorption component 400 to first dry the gas and then collect carbon dioxide to improve the accuracy of the collection result.

[0042] In addition, a moisture absorption bottle 401103 is connected in series on the connecting pipeline 100, and the moisture absorption bottle 401103 is located upstream of the buffer bottle 101 and the filter bottle 102. The moisture absorption bottle 401103 is placed in the cold hydrazine 104 to pre-absorb moisture in the gas through the cold hydrazine 104.

[0043] The second branch pipeline 300 provided by the utility model is connected in series with a washing bottle 301, which is filled with water so that the gas in the second branch pipeline 300 is cleaned by the water in the washing bottle 301 before being discharged, thereby reducing pollution to the environment.

[0044] In some specific embodiments of the present invention, a check valve is provided at the inlet end of the first branch pipeline 200 to prevent the airflow in the first branch pipeline 200 from flowing back into the connecting pipeline or the second branch pipeline 300 to affect the accuracy of the detection result.

[0045] In addition, the utility model also discloses a carbon-14 and tritium detection system, including a tubular combustion device and the carbon-14 and tritium collection device as described above. Therefore, it has all the technical effects of the above-mentioned collection device, which will not be described in detail herein.

[0046] The terms "first" and "second" in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may include steps or units that are not listed.

[0047] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for collecting carbon-14 and tritium, characterized in that: include: A connecting pipeline is connected to the outlet of the tubular combustion device; a first branch pipeline, connected to the outlet end of the connecting pipeline; an absorption assembly, the absorption assembly comprising an absorption bottle connected in series to the first branch pipeline and a cooling element for cooling the absorption bottle, the absorption bottle being filled with 3-methoxypropylamine; The second branch pipeline is at least one in number, and the second branch pipeline and the first branch pipeline are connected in parallel at the outlet end of the connecting pipeline.

2. The carbon-14 and tritium collection device according to claim 1, characterized in that: A flow meter is provided on the first branch pipeline for detecting the gas flow in the first branch pipeline.

3. The carbon-14 and tritium collection device according to claim 2, characterized in that: It also includes a central controller and a control valve, wherein the control valve is arranged on the first branch pipeline; Wherein, the central controller is capable of receiving and storing the flow threshold value in advance, and the flow meter and the control valve are both connected to the central controller by signal; Alternatively, the central controller can receive and store the absorption time in advance, the collection device further comprises a timer, and both the control valve and the timer are connected to the central controller by signal.

4. The carbon-14 and tritium collection device according to claim 1, characterized in that: A buffer bottle and a filter bottle are connected in series on the connecting pipeline. The filter bottle is filled with filter medium. The buffer bottle and the filter bottle are arranged in sequence along the airflow direction.

5. The carbon-14 and tritium collection device according to claim 1, characterized in that: It also includes a drying element, which is connected in series to the first branch pipeline.

6. The carbon-14 and tritium collection device according to claim 1, characterized in that: The connecting pipeline is connected in series with a moisture absorption bottle, which is placed in cold hydrazine.

7. The carbon-14 and tritium collection device according to claim 1, characterized in that: A washing bottle is connected in series to the second branch pipeline, and the washing bottle is filled with water.

8. The carbon-14 and tritium collection device according to claim 1, characterized in that: A check valve is provided at the inlet end of the first branch pipeline.

9. A carbon-14 and tritium detection system, characterized in that: The invention comprises a tubular combustion device and a carbon-14 and tritium collection device according to any one of claims 1 to 8.

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