CN113701812B - Airborne nuclide environment migration simulation test device - Google Patents

Airborne nuclide environment migration simulation test device Download PDF

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Publication number
CN113701812B
CN113701812B CN202110975296.9A CN202110975296A CN113701812B CN 113701812 B CN113701812 B CN 113701812B CN 202110975296 A CN202110975296 A CN 202110975296A CN 113701812 B CN113701812 B CN 113701812B
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airborne
sensor
nuclide
sealed
air
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CN113701812A (en
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王学文
韩宝华
曹俏
张超
李建国
张晟
原寒
吴仁杰
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China Institute for Radiation Protection
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China Institute for Radiation Protection
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00Measuring or testing not otherwise provided for
    • G01D21/02Measuring two or more variables by means not covered by a single other subclass
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

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Abstract

The invention discloses an airborne nuclide environment migration simulation test device which comprises a sealed cabin, an environment condition on-line monitoring system, a gas circulation assembly and a power supply control cabinet, wherein after crops are put in the sealed cabin, airborne nuclides can be put in the sealed cabin through source item release holes, ecological transfer occurs in crops-soil in the sealed cabin, and the nuclides are transferred from air to the crops and transferred to the soil; the environment condition on-line monitoring system can monitor the environment in the sealed bin in real time, and provides a basic guarantee for the smooth implementation of the airborne nuclide ecological transfer test; and the pipeline fan and the fan of the gas circulation assembly are electrically connected with the power supply control cabinet, so that the automatic control of gas circulation is realized, workers do not need to enter the sealed cabin to operate, the radiation dose of the workers is greatly reduced, samples at different parts of crops can be collected for judgment and research after the test is finished, and multidirectional and comprehensive ecological transfer test research of airborne nuclides is carried out.

Description

Airborne nuclide environment migration simulation test device
Technical Field
The invention relates to the technical field of nuclide measurement, in particular to an airborne nuclide environment migration simulation test device.
Background
The transfer parameter of the key airborne nuclides in the key pathway-feeding pathway is the nuclear facility radiation loopAn important component of the assessment of the environmental impact, 14 c and tritium are key nuclides in the gaseous effluent of nuclear facilities, wherein 14 C mainly comprises 14 CO 2 In this form, tritium exists primarily in the form of tritiated water (HTO). During the operation of nuclear facilities, small amounts of radionuclides are released into the environment in the form of gases and deposited onto the surface of crops or soil, which are the main routes of contamination of the human food chain during the growth phase of crops. The ecological transfer of airborne nuclides in crops is an important link of nuclear environment evaluation, and related ecological transfer parameters are key data of radiation dose estimation in public food chains. The current domestic airborne nuclides have the defects of simple pollution mode, short pollution time, low simulation degree and the like in the research process of ecological transfer test of crops, and the research result has great uncertainty.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the airborne nuclide environment migration simulation test device with higher simulation degree.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
in order to solve the technical problems, the invention provides an airborne nuclide environment migration simulation test device, which comprises:
the sealed bin is provided with an active item release hole, a circulating air inlet hole and a circulating air outlet hole;
the environment condition on-line monitoring system is arranged in the sealed bin and comprises a data acquisition measurement and control terminal and a sensor group, and the data acquisition measurement and control terminal is electrically connected with the sensor group;
the gas circulation assembly comprises a pipeline fan and a fan, the pipeline fan is arranged at the bottom of the sealed cabin, and the fan is arranged at the top of the sealed cabin;
the power supply control cabinet is arranged outside the sealed bin and is electrically connected with the environment condition on-line monitoring system and the gas circulation assembly.
Further, the airborne nuclide environmental migration simulation test device further comprises a drip irrigation component, the drip irrigation component comprises a drip irrigation pipe, a waste water collecting pipe and a water pump, the water pump is arranged outside the sealed bin and is electrically connected with the power control cabinet, the water outlet end of the water pump is connected with one end of the drip irrigation pipe, the other end of the drip irrigation pipe is arranged inside the sealed bin, and one end of the waste water collecting pipe is communicated with the inside of the sealed bin.
Further, the airborne nuclide environment migration simulation test device further comprises an air filter, the air filter is arranged outside the sealed bin and is electrically connected with the power control cabinet, and the air filter is communicated with the inside of the sealed bin through a pipeline.
Further, the airborne nuclide environment migration simulation test device further comprises an air dehumidifier, wherein the air dehumidifier is arranged in the sealed bin and is electrically connected with the power supply control cabinet.
Further, the airborne nuclide environment migration simulation test device also comprises CO 2 Reactor, CO 2 The reactor is communicated with the source item release hole through a polyethylene pipe.
Further, the airborne nuclide environment migration simulation test device also comprises a sampler, and the sampler is simultaneously communicated with the circulating air inlet hole and the circulating air outlet hole.
Further, the sampler is a GT-A type air tritium sampler or a GT-A type air carbon-14 sampler.
Further, the sensor group comprises an air/temperature/humidity and pressure four-in-one sensor, a carbon dioxide detection sensor, an illumination intensity sensor and a soil temperature/humidity/soil EC value three-in-one sensor.
Further, the sensor group includes an air sensor, a temperature sensor, a humidity sensor, a pressure sensor, a carbon dioxide detection sensor, an illumination intensity sensor, a soil temperature sensor, a soil humidity sensor, and a soil EC value sensor.
Further, the sealed bin comprises a frame and a bin wall, wherein the frame is made of broken bridge aluminum, the bin wall is made of glass, and rubber, a polyethylene plastic film and anti-seepage paint are paved at the bottom of the sealed bin.
The invention has the beneficial effects that: after the airborne nuclide environmental migration simulation test device provided by the invention is put into crops, the airborne nuclide can be put into the sealed cabin through the source item release hole, ecological transfer of the airborne nuclide occurs in the crops-soil in the sealed cabin, and the nuclide is transferred from the air to leaves and fruits of the crops and is transferred to the soil; the data acquisition measurement and control terminal and the sensor group of the environment condition on-line monitoring system can monitor the environment in the sealed bin in real time, and provide basic guarantee for the smooth proceeding of the airborne nuclide ecological transfer test; and the pipeline fan and the fan of the gas circulation assembly are electrically connected with the power supply control cabinet, so that the automatic control of gas circulation is realized, workers do not need to enter the sealed cabin to operate, the radiation dose of the workers is greatly reduced, samples at different parts of crops can be collected for judgment and research after the test is finished, and multidirectional and comprehensive ecological transfer test research of airborne nuclides is carried out.
Drawings
FIG. 1 is a schematic diagram of an airborne nuclide environment migration simulation test device in an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
Example 1
Referring to fig. 1, the airborne nuclide environmental migration simulation test device of the embodiment comprises a sealed cabin 1, an environmental condition on-line monitoring system 2, a gas circulation assembly 3, a drip irrigation component 4, an air filter 5, an air dehumidifier 6 and a CO 2 A reactor 7, a sampler 8 and a power control cabinet 9.
The sealed bin 1 of the embodiment is provided with an active item release hole 11, a circulating air inlet hole 12 and a circulating air outlet hole 13; source release holes 11 are used for connection of CO 2 Reactor 7, CO 2 The reactor 7 is capable of producing CO with nuclides 2 Thereby delivering the nuclides into the sealed bin 1 and being absorbed by the crops in the sealed bin 1. Notably, CO 2 The reactor 7 is communicated with the source release hole 11 through a polyethylene pipe. Of course, other than the CO of the present embodiment 2 The reactor 7 can also be communicated with the source item release hole 11 through other reactors 7 capable of generating airborne nuclides.
Further, the environmental condition on-line monitoring system 2 of the embodiment is installed in the sealed cabin 1 and comprises a data acquisition and measurement and control terminal 21 and a sensor group 22, and the data acquisition and measurement and control terminal 21 and the sensor group 22 are electrically connected. The sensor group 22 includes an air/temperature/humidity and pressure sensor, a carbon dioxide detection sensor, an illumination intensity sensor, and a soil temperature/humidity/soil EC value sensor. Of course, in other embodiments, separate sensors may be employed for data monitoring, such as sensor group 22 including an air sensor, a temperature sensor, a humidity sensor, a pressure sensor, a carbon dioxide sensor, an illumination intensity sensor, a soil temperature sensor, a soil humidity sensor, and a soil EC value sensor. The environment condition online monitoring system 2 can measure parameters such as air humidity, temperature, CO2 concentration, illumination intensity, air pressure, soil water content, soil humidity, soil temperature and the like in the sealed cabin 1 online in real time.
Further, the gas circulation assembly 3 of the present embodiment includes two duct fans 31 and 32, the two duct fans 31 and 32 are installed at the opposite corners of the bottom of the seal cabin 1, and the two fans 32 are installed at the top of the seal cabin 1; the combined action of the pipeline fan 31 and the fan 32 can mix and seal the gas in the bin 1, so that nuclides are uniformly distributed, and the absorption of crops is facilitated.
Further, the power control cabinet 9 of the embodiment is installed outside the sealed cabin 1, the power control cabinet 9 is electrically connected with the environmental condition on-line monitoring system 2 and the gas circulation assembly 3, and the power control cabinet 9 is used for controlling actions of the environmental condition on-line monitoring system 2 and the gas circulation assembly 3.
Further, the drip irrigation component 4 of the present embodiment includes a drip irrigation pipe 41, a waste water collecting pipe 42 and a water pump 43, the water pump 43 is disposed outside the sealed cabin 1, the water pump 43 is electrically connected with the power control cabinet 9, the water outlet end of the water pump 43 is connected with one end of the drip irrigation pipe 41, the other end of the drip irrigation pipe 41 is disposed inside the sealed cabin 1, and one end of the waste water collecting pipe 42 is communicated with the inside of the sealed cabin 1. In use, the other end of the drip irrigation pipe 41 may be inserted directly into the soil adjacent the crop.
Further, an air filter 5 is installed outside the hermetic container 1, the air filter 5 is electrically connected with the power control cabinet 9, and the air filter 5 is communicated with the inside of the hermetic container 1 through a pipe. In practical use, the airborne nuclide environmental migration simulation test device of the embodiment is placed inside the artificial climate chamber, so that the air filter 5 is communicated with the artificial climate chamber, and the air in the cabin is decontaminated and discharged through the connection of the pipeline inside the artificial climate chamber and the main ventilation pipeline leading to the outside. After the sealing pollution test is finished, the sealing bin 1 is connected with the air filter 5, and air is discharged into a filtering system of the artificial climate chamber after being filtered and discharged after being filtered for the second time.
Further, an air dehumidifier 6 is installed inside the sealed cabin 1, and the air dehumidifier 6 is electrically connected with the power control cabinet 9. The air dehumidifier 6 can control the humidity in the sealed bin 1 in the test process, can also play a role in tritium removal, and the air dehumidifier 6 realizes the timing control of the sealed bin 1, and performs the timing control of the dehumidification amount and the dehumidification time according to the requirement.
Further, the sampler 8 of the present embodiment communicates with both the circulation inlet hole 12 and the circulation outlet hole 13. The sampler 8 is a GT-A type air tritium sampler 8 or a GT-A type air carbon-14 sampler 8.
Further, the sealed bin 1 comprises a frame and a bin wall, wherein the frame is made of broken bridge aluminum, the bin wall is made of glass, and rubber, a polyethylene plastic film and anti-seepage paint are paved at the bottom of the sealed bin 1.
The specific using steps of the airborne nuclide environment migration simulation test device of the embodiment are as follows:
the first step: ventilating the sealed cabin 1; the gas circulation assembly 3 is started to blow the gas in the sealed cabin 1, and the circulation air inlet hole 12 and the circulation air outlet hole 13 on the sealed cabin 1 are opened, so that new air is injected into the sealed cabin 1.
And a second step of: test crops are placed in the sealed bin 1, the sealed bin 1 is numbered a, b, c, d, e, f from east to west, the numbers 1, 2, 3, 4, 5 and 6 are numbered from north to south, the test crops are positioned in the sealed bin 1, and drip irrigation pipes 41 with the same numbers are inserted into corresponding crop pots. And closing a bin door of the sealed bin 1, a circulating air inlet hole 12 and a circulating air outlet hole 13, and entering a sealing test link of the sealed bin 1.
And a third step of: according to the growth requirement and the whole test requirement of crops, the temperature and the illumination intensity of the artificial climate chamber are set, and the temperature and the illumination intensity of the sealed cabin 1 are indirectly controlled. And simultaneously, opening the on-line monitoring system 2 for the environmental conditions of the sealed cabin 1.
Fourth step: in CO 2 Na is added into the reactor 7 2 CO 3 The amount of the radioactive solution to be used, 14 CO 2 is released by Na 2 CO 3 The solution reacts with sulfuric acid to generate CO 2 To ensure that 14 C is released as completely as possible, stabilized Na is present in a certain concentration 2 CO 3 The solution is used for diluting the radioactive source and then is reacted with excessive sulfuric acid to generate 14 CO 2 And CO 2 And (3) introducing the generated gas into a sealed bin 1 for experiment.
Fifth step: and a compressed air atomizer is used as a source item emitter, and the air-borne tritiated water is sprayed into the sealed bin 1 through the source item release hole 11.
Sixth step: the gas circulation assembly 3 in the sealed cabin 1 is started, so that the gas in the sealed cabin 1 is always in a uniform mixing state, and meanwhile, the ecological transfer of the airborne nuclide occurs in the crops-soil in the sealed cabin 1, and the nuclide is transferred from the air to the leaves and fruits of the crops and is transferred to the soil.
Seventh step: and collecting a sample of the radionuclide in the air of the sealed bin 1, and analyzing and measuring the activity concentration change condition of the radionuclide in the air. According to the analysis method of tritium in water (GB 12375-90), a bubbling tritium sampler 8 is used for capturing HTO in air, and distilled water is used as a capturing medium. According to the method for sampling and measuring carbon 14C in air (EJ/T1008-1996), C-14 in air is captured by a bubbling C-14 sampler 8, and 1mol/L NaOH solution is used as a capturing medium.
Eighth step: after the sealing bin 1 is sealed, the interior of the bin is dehumidified, the humidity in the bin is reduced, the air dehumidifier 6 is turned on, and the dehumidification time is 12 hours.
Ninth step: when crops need to be irrigated, the drip irrigation component 4 is turned on, the switch of each drip irrigation pipe 41 is turned on, the water pump 43 is turned on to pump water, and drip irrigation is started.
Tenth step: after the radionuclide concentration in the sealed bin 1 is reduced to the environment level, and the radionuclide in the air is ensured to be lower than the emission limit value, an experimenter enters the sealed bin 1 to sample and analyze the experimented crops. The basis for the determination of 3H and 14C in crops is "determination of radioactive substance hydrogen-3 in food safety national standard food" (GB 14883.2-2016) and "method for sampling and determining carbon 14C in air" (EJ/T1008-1996).
After crops are put into the simulation test device for the environment migration of the airborne nuclide, the airborne nuclide can be put into the sealed cabin 1 through the source item release holes 11, the airborne nuclide is ecologically transferred in the crops-soil in the sealed cabin 1, and the nuclide is transferred from the air to leaves and fruits of the crops and is transferred to the soil; the data acquisition measurement and control terminal 21 and the sensor group 22 of the environment condition online monitoring system 2 can monitor the environment in the sealed cabin 1 in real time, and provide a basic guarantee for the smooth proceeding of the airborne nuclide ecological transfer test; and the pipeline fan 31 and the fan 32 of the gas circulation assembly 3 are electrically connected with the power supply control cabinet 9, so that the automatic control of gas circulation is realized, workers do not need to enter the sealed cabin 1 to operate, the radiation dose of the workers is greatly reduced, after the test is finished, samples at different parts of crops can be collected for judgment research, and multidirectional and comprehensive ecological transfer test research of airborne nuclides is carried out.
The device of the present invention is not limited to the examples in the specific embodiments, and those skilled in the art can obtain other embodiments according to the technical solutions of the present invention, and it is also within the scope of the technical innovation and protection of the present invention.

Claims (8)

1. An airborne nuclide environmental migration simulation test device, which is characterized by comprising:
the sealed bin is provided with an active item release hole, a circulating air inlet hole and a circulating air outlet hole;
the environment condition on-line monitoring system is arranged in the sealed bin and comprises a data acquisition measurement and control terminal and a sensor group, and the data acquisition measurement and control terminal is electrically connected with the sensor group;
the gas circulation assembly comprises a pipeline fan and a fan, wherein the pipeline fan is arranged at the bottom of the sealed bin, and the fan is arranged at the top of the sealed bin;
the power supply control cabinet is arranged outside the sealed bin and is electrically connected with the environment condition on-line monitoring system and the gas circulation assembly;
the CO2 reactor is communicated with the source item release hole through a polyethylene pipe;
the sampler is communicated with the circulating air inlet hole and the circulating air outlet hole at the same time.
2. The airborne nuclide environmental migration simulation test device according to claim 1, further comprising a drip irrigation component, wherein the drip irrigation component comprises a drip irrigation pipe, a waste water collecting pipe and a water pump, the water pump is arranged outside the sealed bin, the water pump is electrically connected with the power control cabinet, the water outlet end of the water pump is connected with one end of the drip irrigation pipe, the other end of the drip irrigation pipe is arranged inside the sealed bin, and one end of the waste water collecting pipe is communicated with the inside of the sealed bin.
3. The airborne nuclide environmental migration simulation test device of claim 1, further comprising an air filter, wherein the air filter is mounted outside the sealed cabin, the air filter is electrically connected with the power control cabinet, and the air filter is communicated with the inside of the sealed cabin through a pipeline.
4. The airborne nuclide environmental migration simulation test device of claim 1, further comprising an air dehumidifier, wherein the air dehumidifier is mounted inside the sealed bin, and wherein the air dehumidifier is electrically connected with the power control cabinet.
5. The airborne nuclide environmental migration simulation test device of claim 1, wherein the sampler is a GT-a type air tritium sampler or a GT-a type air carbon-14 sampler.
6. The airborne nuclide environmental migration simulation test device according to any one of claims 1 to 5, wherein the sensor group comprises an air/temperature/humidity and pressure four-in-one sensor, a carbon dioxide detection sensor, an illumination intensity sensor and a soil temperature/humidity/soil EC value three-in-one sensor.
7. The airborne nuclide environmental migration simulation test device according to any one of claims 1 to 5, wherein the sensor group comprises an air sensor, a temperature sensor, a humidity sensor, a pressure sensor, a carbon dioxide detection sensor, an illumination intensity sensor, a soil temperature sensor, a soil humidity sensor and a soil EC value sensor.
8. The airborne nuclide environmental migration simulation test device according to any one of claims 1-5, wherein the sealed bin comprises a frame and a bin wall, the frame is made of broken bridge aluminum, the bin wall is made of glass, and rubber, a polyethylene plastic film and an anti-seepage coating are paved at the bottom of the sealed bin.
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