CN106950588A - Survey radon system based on semi-conductor dehumidifying technology - Google Patents
Survey radon system based on semi-conductor dehumidifying technology Download PDFInfo
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- CN106950588A CN106950588A CN201611223881.9A CN201611223881A CN106950588A CN 106950588 A CN106950588 A CN 106950588A CN 201611223881 A CN201611223881 A CN 201611223881A CN 106950588 A CN106950588 A CN 106950588A
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- condensation chamber
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- heat dissipation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/24—Measuring radiation intensity with semiconductor detectors
- G01T1/244—Auxiliary details, e.g. casings, cooling, damping or insulation against damage by, e.g. heat, pressure or the like
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Abstract
The invention belongs to emanometer technical field, and in particular to a kind of survey radon system based on semi-conductor dehumidifying technology.Including filter membrane, sampling pump, heat dissipation cavity, the hot face of semiconductor refrigeration sheet, the huyashi-chuuka (cold chinese-style noodles) of semiconductor refrigeration sheet, condensation chamber, thermal insulation layer, water-storage pot, measuring system and radiator；Condensation chamber is mounted on the huyashi-chuuka (cold chinese-style noodles) of semiconductor refrigeration sheet, condensation chamber periphery is enclosed with thermal insulation layer, the one side of heat dissipation cavity is mounted on the hot face of semiconductor refrigeration sheet, the another side of heat dissipation cavity is pasted with radiator, sample gas enters condensation chamber in the presence of sampling pump by filter membrane, water-storage pot is connected with condensation chamber, and heat dissipation cavity is connected with measuring system.The present invention can solve the problems, such as influence of the sample gas humidity to static collection emanometer, and stable, higher collection efficiency is realized without drier.
Description
Technical field
The invention belongs to emanometer technical field, and in particular to a kind of survey radon system based on semi-conductor dehumidifying technology.
Background technology
Static collection is the current method using a kind of measurement radon consistence widely, and this method is by collecting
The first generation daughter Po-218 of radon is measured, it is desirable to which instrument has high and stable collection efficiency.Just decayed generation
Po-218 be free state metallic atom, the probability that there are about 90% is positively charged, and they are collected into the presence of electric field
Detector surface.But during collection, positively charged Po-218 atoms are easy to the water vapour molecule phase with polarizing
Effect becomes neutral particle, and electric field is to its ineffective power, so that collection efficiency is influenceed, so the influence for excluding humidity is to use
The instrument of static collection needs the major issue solved, is also a great problem for perplexing instrument development person for many years.
Influence of the sample gas humidity to static collection emanometer is solved, it is general at present to use desiccant dryness sample gas
The RAD7 electronics emanometers of the method for body, such as the U.S. production, but this method can consume substantial amounts of drier, it is necessary to often more
Drier is changed, uses and carries all inconvenient, can not more realize unattended continuous on-line operation.There is a method in which being exactly
Using temperature and humidity compensation algorithm, but the relation of collection efficiency and humiture is complicated, while also by electric-field intensity, the body of collecting chamber
The influence of the factor such as product and shape, and collection efficiency is very low during measurement high humility gaseous sample, so as to cause the sensitive of instrument
Degree is substantially reduced, and measurement error is still very big after compensation, so in the market almost can not find the shaping instrument made in this way.
The content of the invention
It is wet to solve sample gas it is an object of the invention to provide a kind of survey radon system based on semi-conductor dehumidifying technology
The influence problem to static collection emanometer is spent, stable, higher collection efficiency is realized without drier.
To reach above-mentioned purpose, the technical solution used in the present invention is：
A kind of survey radon system based on semi-conductor dehumidifying technology, including filter membrane, sampling pump, heat dissipation cavity, semiconductor refrigeration sheet
Hot face, the huyashi-chuuka (cold chinese-style noodles) of semiconductor refrigeration sheet, condensation chamber, thermal insulation layer, water-storage pot, measuring system and radiator；Condensation chamber is mounted on
The huyashi-chuuka (cold chinese-style noodles) of semiconductor refrigeration sheet, condensation chamber periphery is enclosed with thermal insulation layer, and the one side of heat dissipation cavity is mounted on the heat of semiconductor refrigeration sheet
Face, the another side of heat dissipation cavity is pasted with radiator, and sample gas enters condensation chamber, water storage in the presence of sampling pump by filter membrane
Bottle is connected with condensation chamber, and heat dissipation cavity is connected with measuring system.
Described sample gas enter condensation chamber after temperature rapidly reduction and it is supersaturated, institute's containing water vapor is in the wall of condensation chamber four
Water is condensed into, moisture in water-storage pot or drainpipe, sample gas is flowed into and substantially reduces；Described sample gas passes through radiating
After chamber, temperature recovery is to 20 DEG C~40 DEG C, and relative humidity drops to 15%, subsequently into the electrostatic collection room of measuring system, collects
The radon daughter that new decay is produced.
Described heat dissipation cavity is processed into aluminium alloy.
Described condensation cavity material is aluminium alloy, and the temperature of condensation chamber is slightly above as low as possible while 0 DEG C.
Described insulating layer material is polyurethane.
Described water-storage pot can be replaced with drainpipe.
Fan is installed on described radiator.
Between described condensation chamber and the huyashi-chuuka (cold chinese-style noodles) of semiconductor refrigeration sheet, between the hot face of semiconductor refrigeration sheet and heat dissipation cavity,
Heat-conducting silicone grease is all smeared between heat dissipation cavity and radiator.
Described measuring system includes electrostatic collection room, silicon semiconductor detector, amplifier and single track or multichannel analyzer,
Analysis calculating is carried out by single-chip microcomputer or microcomputer, the concentration value of radon is obtained.
The Po-218 atoms that radon decay is produced are collected into silicon semiconductor detection in the presence of the electric field of electrostatic collection room
The surface of device, Po-218 continues to decay produces signal on silicon semiconductor detector, by amplifier and multichannel analyzer, obtains
Alpha energy spectrum；Single-chip microcomputer calculates the 6MeV corresponding energy spectral peak of α particles, obtained by calculating peak area by analyzing α spectrums
Po-218 decay is counted, and then calculates the radon consistence of sample gas.
Having the beneficial effect that acquired by the present invention：
The present invention uses conductor refrigeration dehumidifying technology, removes the most of moisture in sample gas, realizes stable
, efficient collection efficiency, so as to solve the problems, such as influence of the sample gas humidity to static collection emanometer.Without using drying
Agent, it is to avoid change the drier of failure, simplify the operation of instrument, it is possible to achieve unattended continuous on-line operation.Without
Substantial amounts of drier is carried, the portability of instrument can be improved.The technology can apply to the electrostatic using semiconductor detector
Collecting method, is also applied for the static collection using scintillator detector.
Brief description of the drawings
Fig. 1 is the survey radon system construction drawing of the present invention based on semi-conductor dehumidifying technology；
In figure：1st, filter membrane；2nd, sampling pump；3rd, heat dissipation cavity；4th, the hot face of semiconductor refrigeration sheet；5th, semiconductor refrigeration sheet is cold
Face；6th, condensation chamber；7th, thermal insulation layer；8th, water-storage pot；9th, measuring system；10th, radiator.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, the survey radon system of the present invention based on semi-conductor dehumidifying technology includes filter membrane 1, sampling pump 2, dissipated
Hot chamber 3, the hot face 4 of semiconductor refrigeration sheet, the huyashi-chuuka (cold chinese-style noodles) 5 of semiconductor refrigeration sheet, condensation chamber 6, thermal insulation layer 7, water-storage pot 8, measurement system
System 9 and radiator 10；Condensation chamber 6 is mounted on the huyashi-chuuka (cold chinese-style noodles) 5 of semiconductor refrigeration sheet, and the periphery of condensation chamber 6 is enclosed with thermal insulation layer 7, radiating
The one side of chamber 3 is mounted on the hot face 4 of semiconductor refrigeration sheet, and the another side of heat dissipation cavity 3 is pasted with radiator 10, and sample gas is being adopted
Condensation chamber 6 is entered by filter membrane 1 in the presence of sample pump 2, water-storage pot 8 is connected with condensation chamber 6, and heat dissipation cavity 3 connects with measuring system 9
Connect.
The condensation chamber 6 can use aluminium alloy or other intermetallic composite coatings, the huyashi-chuuka (cold chinese-style noodles) 5 of semiconductor refrigeration sheet is mounted on, outside it
Enclose and be enclosed with thermal insulation layer 7, the material of thermal insulation layer 7 is polyurethane or other insulation materials.Sample gas is reached after condensation chamber 6, temperature
Rapidly reduction causes vapor supersaturation, and most of water vapor condensation gets off.The system can use water-storage pot 8 to store condensation
Water, can also be expelled directly out with drainpipe.The temperature of condensation chamber 6 be slightly above it is as low as possible while 0 DEG C, such as 1 DEG C ± 0.5 DEG C
Or 2 DEG C ± 1 DEG C etc., not limited to this scope.Sample gas enter condensation chamber 6 after temperature rapidly reduction and it is supersaturated, it is aqueous
Steam condenses into water in the wall of condensation chamber 6 four, flows into water-storage pot 8 or drainpipe.Moisture is substantially reduced in sample gas.
The heat dissipation cavity 3 can use aluminium alloy or the good intermetallic composite coating of other heat conduction, be mounted on semiconductor refrigeration sheet
Hot face 4.The another side of heat dissipation cavity 3 is pasted with radiator 10.If it is necessary, fan, forced heat radiation can be installed on radiator 10.
Between condensation chamber 6 and the huyashi-chuuka (cold chinese-style noodles) of semiconductor refrigeration sheet 5, between the hot face 4 of semiconductor refrigeration sheet and heat dissipation cavity 3, dissipate
Heat-conducting silicone grease is all smeared between hot chamber 3 and radiator 10, to eliminate the air gap of contact surface, thermal resistance is reduced, strengthens its heat
The ability of transmission.
After sample gas is by heat dissipation cavity 3, temperature recovery is to 20 DEG C~40 DEG C, and relative humidity can drop to 15% or so.
Subsequently into the electrostatic collection room of measuring system, the radon daughter that new decay is produced is collected.
Measuring system 9 includes amplifier and single track or multichannel analyzer, carries out analysis calculating by single-chip microcomputer or microcomputer, obtains
To the concentration value of radon.
All pipeline connections should use highdensity plastic flexible pipe, it is to avoid use metal tube.
The semiconductor dehumidifying device of the system has used semiconductor refrigeration sheet.Conductor refrigeration is that a kind of produce bears thermal resistance
Refrigeration Technique：When one piece of N-type semiconductor material and one piece of p-type semiconductor material connect to galvanic couple pair, connect in this circuit
After logical DC current, the transfer with regard to that can produce energy, the joint that electric current flows to p-type element by N-type element absorbs heat, as cold
End, the joint for flowing to N-type element by p-type element discharges heat, as hot junction.Conductor refrigeration advantage is a lot：Refrigeration speed is fast,
Its refrigeration speed can be controlled by adjusting operating current；It is noiseless, without friction, without abrasion, it is reliable, easy to maintenance；Body
Product is small, lightweight；It is free from environmental pollution without using refrigerant；Two kinds of purposes of cooling and heating type can be reached by changing the sense of current,
Accurate temperature control can be realized.
Embodiment one,
Sample gas is by filter membrane 1 in the presence of sampling pump 2, and by condensation chamber 6, radiator 3 reaches measuring system 9
Electrostatic collection room, then emit.Measuring system 9 includes electrostatic collection room, silicon semiconductor detector, amplifying circuit, many
Channel analyzer, SCM system etc..
The temperature control of condensation chamber 6 in the range of 2 DEG C ± 1 DEG C, the rapid drop in temperature of sample gas and it is supersaturated, condensation
Water flows into water-storage pot 8 (manually outwelling water after full).Sample gas enters heat dissipation cavity 3 after condensation chamber 6, and temperature, which rises, to be caused
40 DEG C, relative humidity can be reduced to less than 15%.Radiator 10 installs fan, when the temperature of heat dissipation cavity 3 is too high, is entered using fan
Row forced heat radiation.
The Po-218 atoms that radon decay is produced are collected into silicon semiconductor detection in the presence of the electric field of electrostatic collection room
The surface of device, Po-218 continues to decay produces signal on semiconductor detector, by amplifying circuit and multichannel analyzer, obtains
Alpha energy spectrum.SCM system calculates the 6MeV corresponding energy spectral peak of α particles, by calculating peak area by analyzing α spectrums
The decay for obtaining Po-218 is counted, and then calculates the radon consistence of sample gas.
Sampling pump 2 can always be run in whole measurement process, can also coordinate intermittent duty with semiconductor refrigeration sheet,
When the gas of electrostatic collection room is fully replaced by sample gas, you can stop membrane pump 2 and semiconductor chilling plate
Work, to save electric energy.
Embodiment two,
Sample gas is by filter membrane 1 in the presence of sampling pump 2, and by condensation chamber 6, radiator 3 reaches measuring system 9
Electrostatic collection room, then emit.Measuring system 9 includes electrostatic collection room, silicon semiconductor detector, amplifying circuit, many
Channel analyzer, SCM system etc..
The temperature control of condensation chamber 6 in the range of 1 DEG C ± 0.5 DEG C, the rapid drop in temperature of sample gas and it is supersaturated, it is cold
Solidifying water flows into drainpipe.
Because the effect of sampling pump 2, the gas pressure in condensation chamber 6 is more slightly larger than the emanometer external world, the condensation in drainpipe
Water can discharge emanometer in the presence of pressure differential.
Sample gas enters heat dissipation cavity 3 after condensation chamber 6, and temperature, which rises, causes 40 DEG C, and relative humidity can be reduced to
Less than 15%.Fan is installed on radiator 10, when the temperature of heat dissipation cavity 3 is too high, forced heat radiation is carried out using fan.
The Po-218 atoms that radon decay is produced are collected into silicon semiconductor detection in the presence of the electric field of electrostatic collection room
The surface of device, Po-218 continues to decay produces signal on semiconductor detector, by amplifying circuit and multichannel analyzer, obtains
α is composed.SCM system calculates the 6MeV corresponding energy spectral peak of α particles, obtained by calculating peak area by analyzing α spectrums
Decay to Po-218 is counted, and then calculates the radon consistence of sample gas.
Membrane pump 2 is continuously run, and the gas in electrostatic collection room is continuously updated as newest sample gas, every
Single-chip microcomputer carries out a α analysis of spectrum within 30 minutes, calculates a radon consistence, and measurement result and power spectrum are all stored in into historical data
In.So as to realize the unattended continuous measurement of radon, and measurement result can be sent to numeral in real time by communication interface
Change and information system.
Claims (10)
1. a kind of survey radon system based on semi-conductor dehumidifying technology, it is characterised in that：Including filter membrane (1), sampling pump (2), radiating
Chamber (3), the hot face (4) of semiconductor refrigeration sheet, the huyashi-chuuka (cold chinese-style noodles) (5) of semiconductor refrigeration sheet, condensation chamber (6), thermal insulation layer (7), water-storage pot
(8), measuring system (9) and radiator (10)；Condensation chamber (6) is mounted on the huyashi-chuuka (cold chinese-style noodles) (5) of semiconductor refrigeration sheet, and condensation chamber (6) is outside
Enclose and be enclosed with thermal insulation layer (7), the one side of heat dissipation cavity (3) is mounted on the hot face (4) of semiconductor refrigeration sheet, heat dissipation cavity (3) it is another
Face is pasted with radiator (10), and sample gas enters condensation chamber (6), water-storage pot in the presence of sampling pump (2) by filter membrane (1)
(8) it is connected with condensation chamber (6), heat dissipation cavity (3) is connected with measuring system (9).
2. the survey radon system according to claim 1 based on semi-conductor dehumidifying technology, it is characterised in that：Described sample gas
Body enter condensation chamber (6) afterwards temperature rapidly reduction and it is supersaturated, institute's containing water vapor condenses into water in the wall of condensation chamber (6) four, inflow
Moisture is substantially reduced in water-storage pot (8) or drainpipe, sample gas；After described sample gas is by heat dissipation cavity (3), temperature
Degree goes back up to 20 DEG C~40 DEG C, and relative humidity drops to 15%, and subsequently into the electrostatic collection room of measuring system (9), collection newly declines
Become the radon daughter produced.
3. the survey radon system according to claim 1 based on semi-conductor dehumidifying technology, it is characterised in that：Described heat dissipation cavity
(3) it is processed into aluminium alloy.
4. the survey radon system according to claim 1 based on semi-conductor dehumidifying technology, it is characterised in that：Described condensation chamber
(6) material is aluminium alloy, and the temperature of condensation chamber (6) is slightly above as low as possible while 0 DEG C.
5. the survey radon system according to claim 1 based on semi-conductor dehumidifying technology, it is characterised in that：Described thermal insulation layer
(7) material is polyurethane.
6. the survey radon system according to claim 1 based on semi-conductor dehumidifying technology, it is characterised in that：Described water-storage pot
(8) it can be replaced with drainpipe.
7. the survey radon system according to claim 1 based on semi-conductor dehumidifying technology, it is characterised in that：Described radiator
(10) fan is installed on.
8. the survey radon system according to claim 1 based on semi-conductor dehumidifying technology, it is characterised in that：Described condensation chamber
(6) between the huyashi-chuuka (cold chinese-style noodles) (5) of semiconductor refrigeration sheet, between the hot face (4) of semiconductor refrigeration sheet and heat dissipation cavity (3), heat dissipation cavity (3)
Heat-conducting silicone grease is all smeared between radiator (10).
9. the survey radon system according to claim 1 based on semi-conductor dehumidifying technology, it is characterised in that：Described measurement system
System (9) includes electrostatic collection room, silicon semiconductor detector, amplifier and single track or multichannel analyzer, passes through single-chip microcomputer or microcomputer
Analysis calculating is carried out, the concentration value of radon is obtained.
10. the survey radon system according to claim 9 based on semi-conductor dehumidifying technology, it is characterised in that：Radon decay is produced
Po-218 atoms the surface of silicon semiconductor detector is collected into the presence of the electric field of electrostatic collection room, Po-218 continues
Decay produces signal on silicon semiconductor detector, by amplifier and multichannel analyzer, obtains alpha energy spectrum；Single-chip microcomputer passes through to α
Spectrum is analyzed, and calculates the 6MeV corresponding energy spectral peak of α particles, and the decay that Po-218 is obtained by calculating peak area is counted, so
The radon consistence of sample gas is calculated afterwards.
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| CN201611223881.9A CN106950588B (en) | 2016-12-27 | 2016-12-27 | Survey radon system based on semi-conductor dehumidifying technology |
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Cited By (3)
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| CN110243997A (en) * | 2018-03-07 | 2019-09-17 | 霍尼韦尔国际公司 | The cooling system that draws water in detector |
| CN111337966A (en) * | 2020-03-19 | 2020-06-26 | 衡阳师范学院 | Device and method for measuring soil radon concentration |
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Effective date of registration: 20210425 Address after: 101149 Beijing city Tongzhou District jiukeshu No. 145 Patentee after: BEIJING BRICEM SCIENCE AND TECHNOLOGY Co.,Ltd. Address before: 101149 Beijing city Tongzhou District jiukeshu No. 145 Patentee before: Beijing Institute of chemical metallurgy of nuclear industry |