CN213750347U - Test device for trapping radionuclide in aerosol - Google Patents
Test device for trapping radionuclide in aerosol Download PDFInfo
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- CN213750347U CN213750347U CN202021427914.3U CN202021427914U CN213750347U CN 213750347 U CN213750347 U CN 213750347U CN 202021427914 U CN202021427914 U CN 202021427914U CN 213750347 U CN213750347 U CN 213750347U
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Abstract
The utility model provides a test device for trapping radionuclide in aerosol, which comprises a box body, a sampling head, a flowmeter, a timer, an air pump, a power on button, a power off button, a plurality of liquid absorption bottles and a gas pipeline outlet pipe; the radionuclide liquid trapping device in the aerosol can collect radionuclide in micron-sized aerosol particles; the method can provide verification for the collection efficiency of the conventional filter membrane blocking mode on the radionuclide in the aerosol; the gas collecting device has the advantages of convenience and integration, and is suitable for field gas collection.
Description
Technical Field
The utility model relates to a radiation environment monitoring technology field, concretely relates to test device of radionuclide entrapment in aerosol.
Background
The radioactive nuclides in the environmental aerosol mainly come from various aspects such as cosmic ray generation, natural existence, human practical activity production and the like. Pu in the aerosol mainly comes from human nuclear activities such as nuclear tests, nuclear fuel reprocessing plants, waste discharge of nuclear facilities, nuclear accidents, and incineration of satellites carrying nuclear materials. U, Po belong to natural nuclides, some human activities increase their content in environmental aerosols.
During the operation of the nuclear facility, some radionuclides are released into the ambient air along with the gaseous effluent, and some radionuclides have strong radioactive toxicity and biological toxicity, such as Pu,210Po, U isotopes, and the like, in the radionuclide toxicity group,239Pu、210Po、234u is in the extremely toxic group. Some nuclides are easy to enrich in human bodies, have long half-lives, and cause long-term continuous irradiation, for example, Pu is easy to enrich in bone marrow and poses serious threats to human health, so that monitoring of the radioactive nuclides in the aerosol in the environment around the facility is important.
From the perspective of protecting the environment and human health, the monitoring of the radionuclide in the environmental aerosol is a very important monitoring object for relevant units and supervision departments, which is not only related to the estimation of irradiation dose in personnel and the effective implementation of protective measures, but also can promote the virtuous cycle development of nuclear energy industry.
At present, no standard method for collecting plutonium in aerosol is provided in China, nuclide sampling is rarely researched, and the method mainly adopts a filter membrane blocking mode for collection, and the filter membrane blocking mode has few relevant reports on the plutonium collecting effect in aerosol. The currently common aerosol sample collecting device mainly comprises a large-flow aerosol sampler, a portable medium-flow aerosol sampler, a large-flow impact type graded sampler (five-grade or six-grade) and a small-flow impact type aerosol graded sampler (eight-grade).
The method for collecting the aerosol sample by the negative pressure air extraction method is used for collecting plutonium in daily aerosol, and the following results are found in the experimental process: after the filter membrane blocks the aerosol, plutonium can penetrate the filter membrane and is not trapped, so that the subsequent nuclide analysis result is low, and the accuracy of the nuclide content in the aerosol is influenced. On the other hand, from the estimation of the internal irradiation dose, the small-particle size aerosol is easier to deposit in the deep lung of the human body, and the internal irradiation contribution is larger. It is therefore necessary to focus on the effect of radionuclide capture in the aerosol.
The traditional filter membrane blocking mode is incomplete in trapping the radioactive nuclide in the aerosol and directly influences the analysis result of the nuclide to be detected. The reason analyzed is as follows:
(1) the filter membrane material has pores, and the blocking effect on the aerosol with the particle size smaller than the pores is poor.
(2) The sampling efficiency of the glass fiber membrane on the particles with the particle size of more than 0.3 mu m is more than 99 percent, and the glass fiber membrane aims at the particles, but the research is not carried out on the sampling efficiency of the radioactive nuclide.
(3) At present, most of impact type aerosol grading samplers classify aerosol particles below PM10, the minimum particle size of the classified aerosol can be more than 0.4 μm, the particles with smaller particle sizes cannot be collected, and the distribution rule is not clear.
Therefore, it is important to have a test device capable of effectively trapping the radionuclide in the aerosol.
Disclosure of Invention
To the defect that exists among the prior art, the utility model aims to provide a test device of radionuclide entrapment in aerosol, this test device uses conveniently, and is firm reliable, can effectively carry out the entrapment to the radionuclide.
In order to achieve the above object, the utility model adopts the following technical scheme:
a test device for radionuclide trapping in aerosol, the test device comprising,
a box body;
a sampling head;
the flowmeter is fixedly arranged on the box body;
the timer is fixedly arranged on the box body;
the air suction pump is arranged in the inner cavity of the box body;
the power supply starting button is arranged on the box body;
the power supply closing button is arranged on the box body;
a plurality of liquid absorption bottles arranged side by side in the tank inner cavity, wherein the liquid absorption bottle positioned at the rearmost side contains a desiccant therein, and the remaining liquid absorption bottles contain a liquid absorption solution therein;
one end of the gas pipeline is connected with the sampling head, and the other end of the gas pipeline is connected with the flowmeter;
the bottle mouth of each liquid absorption bottle is provided with a pair of gas connecting pipelines, one gas connecting pipeline is a gas inlet connecting pipeline, the other gas connecting pipeline is a gas outlet connecting pipeline, and the gas outlet connecting pipeline is connected with the gas inlet connecting pipeline of the adjacent liquid absorption bottle;
and the gas pipeline gas outlet pipe is used for connecting the liquid absorption bottle positioned at the rearmost side with the air pump through the gas pipeline gas outlet pipe.
In some embodiments, the sampling head is mounted on the periphery of the box body through a sampling head bracket.
In some embodiments, a gas pulverizer is further disposed at the bottom end of each gas outlet connecting pipeline.
In some embodiments, each gas inlet connecting line extends into the bottom end of the cavity of the liquid absorption bottle, and each gas outlet connecting line is located above the liquid absorption solution in the cavity of the liquid absorption bottle.
In some embodiments, the inner wall of the region in the box body for mounting the plurality of liquid absorption bottles is provided with a plastic foam buffer layer.
In some embodiments, a plurality of the liquid absorption bottles are placed in the inner cavity on the right side of the box body, and the right side area of the box body is provided with a cabinet door capable of being opened and closed.
In some embodiments, a plurality of observation windows are arranged on the cabinet body at the side of the box body.
In some embodiments, the pump is a pump configuration with adjustable pumping flow.
The invention has the beneficial effects that:
1. the radionuclide liquid trapping device in the aerosol can collect radionuclide in micron-sized aerosol particles;
2. the method can provide verification for the collection efficiency of the conventional filter membrane blocking mode on the radionuclide in the aerosol;
3. the gas collecting device has the advantages of convenience and integration, and is suitable for field gas collection.
Drawings
FIG. 1 is a schematic diagram of the structural principle of a test device for capturing radionuclide in aerosol according to the present invention;
in the figure:
1-a sampling head, 2-a sampling head bracket, 3-a gas pipeline, 4-a left half part of a box body, 5-an air pump, 6-a flow meter, 7-a timer, 8-a power supply opening button, 9-a power supply closing button, 10-a right half part of the box body, 11-a liquid absorption bottle, 12-a gas crusher, 13-a liquid absorption solution, 14-a drying agent, 15-a gas pipeline gas outlet pipe and 16-a flow regulating valve.
Detailed Description
The present invention will be described in further detail with reference to the drawings and the following detailed description.
Referring to fig. 1, the present embodiment provides a test apparatus for capturing radionuclide in aerosol, which includes a box, a sampling head 1, a flow meter 6, a timer 7, an air pump 5, a power on button 8, a power off button 9, a plurality of liquid absorption bottles 11, a gas pipeline 3, and a gas pipeline gas outlet pipe 15. Sampling head 1 is installed in the periphery of box through the sampling head support 2 that is provided with, and is specific, and main part machine case facade is hugged closely to sampling head support 2 and gas connecting pipe, and sampling head 1 is placed to sampling head support 2 upper end for gather Total Suspended Particles (TSP) in the air. A plurality of liquid absorption bottles 11 are arranged in parallel in the inner cavity of the box body, wherein the liquid absorption bottle 11 positioned at the rearmost side is an empty bottle, and a drying agent 14 is contained in the empty bottle so as to filter damp gas in the liquid absorption bottle 11 at the front end and prevent the air suction pump 5 from being corroded; and the remaining plurality of liquid-absorbing bottles 11 contain a liquid-absorbing solution 13 therein. It will be understood that the number of the liquid absorption bottles 11 is flexibly set as required. One end of the gas pipeline 3 is connected with the sampling head 1, and the other end of the gas pipeline is connected with the flowmeter 6. A pair of gas connecting pipelines is arranged at the bottle mouth of each liquid absorption bottle 11, one gas connecting pipeline is a gas inlet connecting pipeline, the other gas connecting pipeline is a gas outlet connecting pipeline, the gas outlet connecting pipeline and the gas inlet connecting pipeline between the adjacent pair of liquid absorption bottles 11 are connected, namely, the adjacent pair of liquid absorption bottles 11 are connected through the gas connecting pipeline, namely, the gas outlet connecting pipeline in the liquid absorption bottle 11 positioned at the front side is connected with the gas inlet connecting pipeline in the adjacent liquid absorption bottle 11, so that the communication between the adjacent liquid absorption bottles 11 is realized. The liquid absorption bottle 11 at the rearmost side is connected with the air pump 5 through an air outlet pipe 15 of the air pipeline.
In some embodiments, the box is rectangular, divided into left and right sides, and the left half includes: flowmeter 6, time-recorder 7, aspiration pump 5, power on/off button, power plug and power cord, right half includes multistage liquid absorption bottle 11, gas pipeline 3, business turn over gas port.
In some embodiments, the left half part 4 of the box body is divided into two lower layers, the lower layer is open, and an air pump 5 is placed on the lower bottom plate and fixed; the upper layer is provided with a cabinet door with a lock, the interior of the cabinet door is provided with a flowmeter 6, a timer 7, a button for turning on/off a power supply, a power plug and a power line after the cabinet door is opened, and the flowmeter 6 and the timer 7 have a real-time display function. The display screen of the flowmeter 6 is embedded in the outer surface of the main case, the external of the case can be subjected to key operation and volume display, the volume display is divided into an upper line and a lower line, the upper line is an accumulated number of the total sampling volume, and the lower line is a real-time display of the sampling flow. The display screen of the timer 7 is embedded in the outer surface of the main case, the key operation and the display of the sampling time can be carried out outside the case body, the sampling time can be set in two modes, one mode is a countdown method, the total sampling time of the aerosol is set, and once the sampling time is up, the sampling can be automatically stopped; the other method is a sequential timing method, the sampling time is 0, and when the required volume is accumulated, the instrument is manually closed.
In some embodiments, a gas pulverizer 12 is further disposed at the bottom end of each gas outlet connecting pipeline to perform a bubble pulverizing function. Each air inlet connecting pipeline extends into the bottom end of the inner cavity of the liquid absorption bottle 11, and each air outlet connecting pipeline is positioned above the liquid absorption solution 13 in the inner cavity of the liquid absorption bottle 11, namely above the liquid level of the liquid absorption solution 13.
In some embodiments, the right half 10 of the housing has a plurality of observation windows on its outer surface for observing the liquid level and the bubbling state of the gas inside the liquid absorption bottle 11.
In some embodiments, the air pump 5 is an air pump with adjustable air pumping flow, and the size control of the total sampling flow can be realized through flow adjustment.
When the sampling system is used, after the circuit connection work is done, the green power supply starting button 8 is pressed, and the sampling system starts to supply power. The parameters of the flowmeter 6 are set on the operation panel of the flowmeter 6, and the sampling accumulated volume is reset to zero, so that the calculation of the accumulated volume of the current sampling is facilitated. The aerosol collection time length is set on an operation panel of the timer 7, the timer 7 controls the opening and closing functions of the air suction pump 5, and the mode can be a countdown method, wherein the total sampling time length is set, the sampler stops sampling automatically when the ending time is up, and the mode is a sequential timing method, the initial sampling time is set to be 0:00, and the instrument is manually closed when the required volume is accumulated. After the setting is finished, the start button of the timer 7 is pressed, the air pump 5 starts to work, and the gas flow reaches the set requirement of an experimenter by adjusting the flow regulating valve 16 on the air pump 5 and observing the instantaneous flow in the display screen of the flow meter 6. Before sampling is finished, sampling can be stopped in two modes, wherein one mode is that when the timer 7 adopts a countdown method and sets the total sampling duration, the sampler can automatically stop sampling when the end time is up, and the other mode is a sequential timing method and sets the initial sampling time to be 0:00 and when the required volume is accumulated, a stop button of the timer 7 is manually pressed, and the air suction pump 5 stops working. At which time the accumulated volume on the display screen of the flow meter 6 and the accumulated sample time duration on the timer 7 are read. And opening a cabinet door at the top of the right half part 10 of the main body box body, taking out each level of liquid absorption bottle 11 from the right half part 10 of the main body box body, and transferring the absorption solution into a beaker for the nuclear element radiochemical analysis. The empty absorption flask was cleaned and drained for the next sampling. And opening the sampling head 1, taking down the aerosol sampling membrane, folding, putting into a sealing bag, and putting into a laboratory for the radiochemical analysis of the nuclein.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalent technologies, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A test device for the capture of radionuclides in an aerosol, said test device comprising,
a box body;
a sampling head;
the flowmeter is fixedly arranged on the box body;
the timer is fixedly arranged on the box body;
the air suction pump is arranged in the inner cavity of the box body;
the power supply starting button is arranged on the box body;
the power supply closing button is arranged on the box body;
a plurality of liquid absorption bottles arranged side by side in the tank inner cavity, wherein the liquid absorption bottle positioned at the rearmost side contains a desiccant therein, and the remaining liquid absorption bottles contain a liquid absorption solution therein;
one end of the gas pipeline is connected with the sampling head, and the other end of the gas pipeline is connected with the flowmeter;
the bottle mouth of each liquid absorption bottle is provided with a pair of gas connecting pipelines, one gas connecting pipeline is a gas inlet connecting pipeline, the other gas connecting pipeline is a gas outlet connecting pipeline, and the gas outlet connecting pipeline is connected with the gas inlet connecting pipeline of the adjacent liquid absorption bottle;
and the gas pipeline gas outlet pipe is used for connecting the liquid absorption bottle positioned at the rearmost side with the air pump through the gas pipeline gas outlet pipe.
2. The device for testing radionuclide trapping in aerosol according to claim 1, wherein the sampling head is mounted on the periphery of the box body through a sampling head bracket.
3. A test device for radionuclide trapping in aerosol according to claim 1 or 2, characterized in that the bottom end of each gas outlet connecting pipeline is further provided with a gas pulverizer.
4. The device as claimed in claim 3, wherein each of said air inlet connecting lines extends into the bottom of the cavity of said liquid absorption bottle, and each of said air outlet connecting lines is located above the liquid absorption solution in the cavity of said liquid absorption bottle.
5. The device for testing radionuclide trapping in aerosol according to claim 1, wherein the inner wall of the region for installing the plurality of liquid absorption bottles in the box body is provided with a plastic foam buffer layer.
6. A test device for radionuclide trapping in aerosol according to claim 1 or 5, characterized in that a plurality of the liquid absorption bottles are placed in the inner cavity on the right side of the box body, and the top of the right side of the box body is provided with a cabinet door which can be opened and closed.
7. The experimental apparatus for radionuclide trapping in aerosol as claimed in claim 6, wherein the cabinet on the side of the box body is provided with a plurality of observation windows.
8. The experimental apparatus for radionuclide trapping in aerosol according to claim 1, wherein the air pump is an air pump structure with adjustable air pumping flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021427914.3U CN213750347U (en) | 2020-07-20 | 2020-07-20 | Test device for trapping radionuclide in aerosol |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021427914.3U CN213750347U (en) | 2020-07-20 | 2020-07-20 | Test device for trapping radionuclide in aerosol |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432930A (en) * | 2021-05-24 | 2021-09-24 | 中国原子能科学研究院 | Representative sampling system and method for Po-210 in chimney gaseous effluent |
| CN114383899A (en) * | 2021-12-01 | 2022-04-22 | 中国辐射防护研究院 | Liquid absorption method of radionuclide in aerosol |
-
2020
- 2020-07-20 CN CN202021427914.3U patent/CN213750347U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113432930A (en) * | 2021-05-24 | 2021-09-24 | 中国原子能科学研究院 | Representative sampling system and method for Po-210 in chimney gaseous effluent |
| CN114383899A (en) * | 2021-12-01 | 2022-04-22 | 中国辐射防护研究院 | Liquid absorption method of radionuclide in aerosol |
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