CN104570038B - A kind of method and device of quick measurement radon consistence - Google Patents
A kind of method and device of quick measurement radon consistence Download PDFInfo
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- CN104570038B CN104570038B CN201410838570.8A CN201410838570A CN104570038B CN 104570038 B CN104570038 B CN 104570038B CN 201410838570 A CN201410838570 A CN 201410838570A CN 104570038 B CN104570038 B CN 104570038B
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Abstract
The invention belongs to radioactivity survey technical field, a kind of method and device of quick measurement radon consistence is disclosed.The device includes high efficiency particle air filter, electrostatic trap, decay chamber, flow gas parallel-plate chamber, electrometer, flow control system and vavuum pump, wherein electrostatic trap is connected with high efficiency particle air filter, the rear and front end of decay chamber connects electrostatic trap and ionisation chamber respectively, and vavuum pump and flow control system are connected by pipeline with ionisation chamber.This method is：Radon air will be contained by entering decay chamber after high efficiency particle air filter and electrostatic trap, the α particles that radon decay emission in decay chamber goes out collide with the air in decay chamber and produce electronic and ionic pair, electronic and ionic is collected to being ionized room collector and produces current information, and real-time radon consistence value is obtained according to current information and calibration curve.The method and apparatus that the present invention is provided, to radon consistence change the response time it is small, accuracy of measurement is high and can monitor the change of radon consistence value in real time.
Description
Technical field
The invention belongs to radioactivity survey technical field, and in particular to a kind of method and device of quick measurement radon consistence.
Background technology
Radon is a kind of radgas present in nature, the average natural radiation year of China public caused by radon and its daughter
Effective dose (1.15mSv) accounts for the 47.9% of the total effective dose (2.4mSv) of size selective sampling year.Environmental Protection Agency (EPA) investigates
It was found that, radon gas is only second to smoking row and occupies second, the radiological hazard that recent radon and its daughter are produced in the origin cause of formation of lung cancer morbidity
Lung cancer morbidity rate can be increased to have got the nod.Routine method of radon measurement is divided into active type measure method (Double Filter, balloon method at present
With scintillation chamber method etc.) and passive measurement method (activated carbon box method, track etch method and activated carbon filter paper method etc.), detection used
Device type is semiconductor detector or FT-648 detectors etc., but two kinds of measuring methods and equipment therefor can not be realized to radon
The quick measurement of change in concentration and in real time reflection radon consistence change curve, in the height radon consistence such as uranium mine tunnel and basement place
During air quality monitoring, it is impossible in time reflection radon consistence level to remind related personnel to properly protect with reduce suction cause in
Irradiation harm.
The content of the invention
(1) goal of the invention
According to the problems of prior art, the invention provides it is a kind of the radon consistence change response time is less than 5s,
The measurement result degree of accuracy is high and can monitor the measuring method and device of radon consistence change in real time.
(2) technical scheme
In order to solve the problems of prior art, the present invention is achieved by the following technical solutions：
A kind of device of quick measurement radon consistence, the device includes high efficiency particle air filter and positioned at high efficiency particle air filter
Electrostatic trap, decay chamber, flow gas parallel-plate chamber, electrometer, flow control system and the vavuum pump of rear end, wherein quiet
Electric collecting device is connected with high efficiency particle air filter, and the rear and front end of decay chamber connects electrostatic trap and flow gas parallel-plate respectively
Ionisation chamber, vavuum pump and flow control system are connected by pipeline with flow gas parallel-plate chamber.
Preferably, the height of one end that the decay chamber is connected with electrostatic trap gradually increases, and air-flow is being declined
Become indoor smooth flow.
Preferably, it is provided with the deflector with gas port at the air inlet of the flow gas parallel-plate chamber；Gas
Abreast it is provided with collector, protection pole and high-pressure stage, three electricity in formula parallel-plate chamber successively according to air-flow direction of advance
Pole is equidistantly arranged with 0.5~1cm interval, makes to form uniform electric field in flow gas parallel-plate chamber；The collector, height
Pressure pole and protection pole are metal grid mesh or metal perforated plate.
Preferably, the flow control system includes flow control valve and flowmeter, and the flow velocity for controlling the air containing radon is 30
~60L/min.
Preferably, the electrometer is connected to obtain ionisation chamber collection with the collector of flow gas parallel-plate chamber
Current information.
Preferably, the collector, high-pressure stage and protection pole are metal perforated plate.
Preferably, the material of the collector, high-pressure stage and protection pole is brass.
The method that radon consistence is continuously measured using said apparatus is comprised the following steps：
In the presence of vavuum pump, air containing radon is passed through into high efficiency particle air filter and quiet with 30~60L/min flow velocity
Enter decay chamber after electric collecting device, α particles that radon decay emission in decay chamber goes out and the air in decay chamber collide production
Raw electronic and ionic pair, electronic and ionic is collected to being collected pole in the flow gas parallel-plate chamber through air carrying band to rear end, profit
Obtain collector current information in real time with electrometer, real-time radon consistence value is then obtained according to current information and calibration curve.
The calibration curve is to be decayed to produce with the air containing radon of radon consistence known to above-mentioned measurement device in Standard Radon Chamber
Current information and obtained according to the relation of radon consistence and current information.
(3) beneficial effect
The measuring method and device for the radon consistence that the present invention is provided, accuracy of measurement small to the radon consistence change response time
It is high and the change of radon consistence value can be monitored in real time, be specially：
(1) accuracy of measurement is high.The apparatus and method provide power using vavuum pump, and air containing radon passes through highly effective air mistake
After filter is except dust and radon daughter, then by the electrostatic charge in electrostatic trap removing air, farthest avoid shadow
The unfavorable factor of flow gas parallel-plate chamber measurement is rung, measurement accuracy is improved.
(2) it is small to the radon consistence change response time.Radon is being carried out to the height radon consistence such as uranium mine tunnel and basement place
During measurement of concetration, response time small measuring method and device can reflect radon consistence level in time to remind related personnel to carry out
The interior irradiation caused to reduce suction is protected to endanger, the odds such as reduction lung cancer.The application is using flow gas parallel-plate electricity
From room as detector, continuous air flow rapidly, continuously, in real time can produce radon decay emission α particle ionizations surrounding air
Raw electronic and ionic to carrying parallel-plate chamber collector in time, to realize to the continuity of radon concentration monitoring and to radon
The response promptness of change in concentration measurement, compared to the pattern that conventional radon detector uses pumping-standing-measurement, its is real
Realize radon consistence and continue the continuous measurement without pause.Flow gas parallel-plate chamber directly collects radon decay hair as detector
The electronic and ionic pair of α particle ionizations surrounding air generation is penetrated, it is fast to radon consistence change response, the response time≤5s, and conventional
The radon detector measurement a cycle shortest time is about 5min.
In addition, equidistantly being arranged with 0.5~1cm interval between each electrode that parallel-plate chamber is set, it is ensured that energy
Uniform electric field is enough provided；Electrode is done by using metal perforated plate or screen cloth, the chatter noise of detector is also effectively reduced；Together
When, by setting deflector at the air inlet of ionisation chamber, air flow method can be made more uniform, flow perturbation is avoided as far as possible to electricity
The influence of field signal.
Brief description of the drawings
Fig. 1 is the schematic diagram for the measuring system that the present invention is provided, wherein 1 is high efficiency particle air filter；2 be electrostatic collection
Device；3 be decay chamber；4 be flow gas parallel-plate chamber；5 be flow control valve；6 be flowmeter, and 7 be the first connecting pipeline；8
It is vavuum pump；9 be the second connecting pipeline；10 be electrometer；11 be data handling system.
Embodiment
Below in conjunction with specification drawings and specific embodiments, the present invention is further elaborated.
Embodiment 1
A kind of device of quick measurement radon consistence, as shown in figure 1, the device includes high efficiency particle air filter 1 and positioned at height
The electrostatic trap 2 of effect air cleaner 1 rear end, decay chamber 3, flow gas parallel-plate chamber 4, electrometer 10, flow control
System and vavuum pump 8, wherein electrostatic trap 2 are connected with high efficiency particle air filter 1, and the rear and front end of decay chamber 3 is connected respectively
Electrostatic trap 2 and flow gas parallel-plate chamber 4, vavuum pump 8 and flow control system pass through pipeline and flow gas parallel-plate
Ionisation chamber 4 is connected.The height of one end that the decay chamber 3 is connected with electrostatic trap 2 gradually increases, and air-flow is being declined
Become smooth flow in room 3.The deflector with gas port, gas are provided with the air inlet of the flow gas parallel-plate chamber 4
Abreast it is provided with collector, protection pole and high-pressure stage, three electricity in formula parallel-plate chamber 4 successively according to air-flow direction of advance
Pole is equidistantly arranged with 0.5~1cm interval, makes to form uniform electric field in flow gas parallel-plate chamber 4；The collector,
High-pressure stage and protection pole are brass aperture plate or brass orifice plate.The flow control system includes flow control valve 5 and flowmeter
6.The electrometer 10 is connected with the collector of flow gas parallel-plate chamber 4 to be collected with obtaining flow gas parallel-plate chamber 4
Current information.
The method that radon consistence is continuously measured using said apparatus is comprised the following steps：
In the presence of vavuum pump 8, air containing radon is passed through into high efficiency particle air filter 1 and electrostatic with 30L/min flow velocity
Enter decay chamber 3 after collector 2, the α particles that radon decay emission in decay chamber 3 goes out collide with the air in decay chamber 3
Electronic and ionic pair is produced, electronic and ionic is collected to being collected pole in the flow gas parallel-plate chamber 4 through air carrying band to rear end,
Collector current information is obtained in real time using electrometer 10, and real-time radon consistence is then obtained according to size of current and calibration curve
Value.
Preferably, the calibration curve is to be declined in Standard Radon Chamber with the air containing radon of radon consistence known to above-mentioned measurement device
Become the current information produced and obtained according to the relation of radon consistence and current information.
Embodiment 2
As different from Example 1, air containing radon passes through high efficiency particle air filter and electrostatic collection with 60L/min flow velocity
Enter decay chamber after device.
Claims (6)
1. a kind of device of quick measurement radon consistence, it is characterised in that the device includes high efficiency particle air filter and positioned at efficient
The electrostatic trap of air cleaner rear end, decay chamber, flow gas parallel-plate chamber, electrometer, flow control system and true
Empty pump, wherein electrostatic trap are connected with high efficiency particle air filter, the rear and front end of decay chamber connect respectively electrostatic trap and
Flow gas parallel-plate chamber, vavuum pump and flow control system are connected by pipeline with flow gas parallel-plate chamber；Institute
The height for stating one end that decay chamber is connected with electrostatic trap gradually increases；The air inlet of the flow gas parallel-plate chamber
The deflector with gas port is provided with mouthful；Abreast set successively according to air-flow direction of advance in flow gas parallel-plate chamber
Collector, protection pole and high-pressure stage are equipped with, three electrodes are equidistantly arranged with 0.5~1cm interval, make flow gas parallel-plate electricity
From indoor formation uniform electric field；The collector, high-pressure stage and protection pole are metal grid mesh or metal perforated plate.
2. a kind of device of quick measurement radon consistence according to claim 1, it is characterised in that the flow control system
Including flow control valve and flowmeter.
3. the device of a kind of quick measurement radon consistence according to claim 1, it is characterised in that the electrometer and gas
The collector of formula parallel-plate chamber connects to obtain the current information of flow gas parallel-plate chamber collection.
4. the device of a kind of quick measurement radon consistence according to claim 1, it is characterised in that the collector, high pressure
Pole and protection pole are metal perforated plate.
5. the device of a kind of quick measurement radon consistence according to claim 1, it is characterised in that the collector, high pressure
The material of pole and protection pole is brass.
6. the method for radon consistence is continuously measured using device as claimed in claim 1, it is characterised in that this method includes following
Step：
In the presence of vavuum pump, air containing radon is received with 30~60L/min flow velocity by high efficiency particle air filter and electrostatic
Enter decay chamber after storage, the α particles that radon decay emission in decay chamber goes out collide with the air in decay chamber and produce electricity
Daughter ion pair, electronic and ionic is collected to being collected pole in the flow gas parallel-plate chamber through air carrying band to rear end, using quiet
Electricity meter obtains collector current information in real time, then obtains real-time radon consistence value according to current information and calibration curve.
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| CN201410838570.8A CN104570038B (en) | 2014-12-30 | 2014-12-30 | A kind of method and device of quick measurement radon consistence |
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| CN201410838570.8A CN104570038B (en) | 2014-12-30 | 2014-12-30 | A kind of method and device of quick measurement radon consistence |
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| CN104570038A CN104570038A (en) | 2015-04-29 |
| CN104570038B true CN104570038B (en) | 2017-07-14 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137470B (en) * | 2015-09-11 | 2018-10-12 | 北京市化工职业病防治院 | Portable radon thorium emanation detection device |
| CN105158788B (en) * | 2015-09-30 | 2018-02-27 | 衡阳师范学院 | The method of open loop type synchro measure Effective Decay Constant and precipitation rate of radon |
| CN106814386B (en) * | 2015-12-01 | 2019-09-06 | 中国计量科学研究院 | Condense 2 π solid angle measuring methods of radon need activity |
| CN106842276B (en) * | 2017-03-10 | 2023-06-16 | 山东中测校准质控技术有限公司 | Orifice plate type collector plate diagnosis ionization chamber |
| CN107831524B (en) * | 2017-12-18 | 2023-05-12 | 成都理工大学 | Radon exhalation rate continuous measurement device and measurement method |
| CN109752751B (en) * | 2019-01-23 | 2020-11-24 | 成都理工大学 | In the air131I dynamic balance monitoring device and monitoring method |
| CN109991137A (en) * | 2019-04-02 | 2019-07-09 | 霸州市地海云天环保科技有限公司 | Small ion collection type monitoring device of powder-like waste based on αsource |
| CN112051603A (en) * | 2020-09-28 | 2020-12-08 | 中国科学院大学 | Device and method for detecting radon content |
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| CN201173909Y (en) * | 2008-03-05 | 2008-12-31 | 中国原子能科学研究院 | System of ion-pulse ionization chamber for measuring radon concentration |
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| CN201173909Y (en) * | 2008-03-05 | 2008-12-31 | 中国原子能科学研究院 | System of ion-pulse ionization chamber for measuring radon concentration |
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