CN107219549A - A kind of drop radon system for low Natural Radiation Level measuring chamber - Google Patents

A kind of drop radon system for low Natural Radiation Level measuring chamber Download PDF

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Publication number
CN107219549A
CN107219549A CN201710350050.6A CN201710350050A CN107219549A CN 107219549 A CN107219549 A CN 107219549A CN 201710350050 A CN201710350050 A CN 201710350050A CN 107219549 A CN107219549 A CN 107219549A
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China
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radon
measuring chamber
air
drop
shield
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CN201710350050.6A
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CN107219549B (en
Inventor
王丽姣
肖文慧
陆正
文富平
夏益华
何力华
卢瑛
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China Institute of Atomic of Energy
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China Institute of Atomic of Energy
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01TMEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T7/00Details of radiation-measuring instruments
    • G01T7/02Collecting means for receiving or storing samples to be investigated and possibly directly transporting the samples to the measuring arrangement; particularly for investigating radioactive fluids
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01TMEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T7/00Details of radiation-measuring instruments
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01TMEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T7/00Details of radiation-measuring instruments
    • G01T7/02Collecting means for receiving or storing samples to be investigated and possibly directly transporting the samples to the measuring arrangement; particularly for investigating radioactive fluids
    • G01T7/04Collecting means for receiving or storing samples to be investigated and possibly directly transporting the samples to the measuring arrangement; particularly for investigating radioactive fluids by filtration
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D27/00Simultaneous control of variables covered by two or more of the preceding main groups
    • G05D27/02Simultaneous control of variables covered by two or more of the preceding main groups characterised by the use of electric means

Abstract

The invention belongs to nuclear radiation monitoring technical field, it is related to a kind of drop radon system for low Natural Radiation Level measuring chamber.Described drop radon system includes measuring chamber, shield, shield door, air intake equipment, filtering adsorpting device, ventilation shaft, air inlet, air outlet, it is provided with described shield on four surface side walls, top surface and the ground of described measuring chamber, and described shield door is provided with a surface side wall wherein;Described air intake equipment from extraneous, through described ventilation shaft and its end be connected with described measuring chamber described in air inlet to described measurement room ventilation;Described air outlet is arranged in described measuring chamber, for outwardly air draft;The intake of described air inlet is more than the exhaust air rate of described air outlet;Described filtering adsorpting device is arranged on described ventilation shaft.Using the drop radon system for low Natural Radiation Level measuring chamber of the present invention, measurement indoor radon concentration and radon daughter concentration can be effectively reduced.

Description

A kind of drop radon system for low Natural Radiation Level measuring chamber
Technical field
The invention belongs to nuclear radiation monitoring technical field, it is related to a kind of drop radon for low Natural Radiation Level measuring chamber System.
Background technology
Interior irradiation whole-body counter is used to measure human body intake radionuclide amount, can be estimated and put according to measurement result The Committed effective dose penetrated in sex work personnel's body, therefore in the duty of personal Evaluation of Radiation Dose and guarantee Radial-stricken Workers in Nuclear Industry It is significant in terms of industry health and safety.
Interior irradiation whole-body counter includes two necessary parts:Detector and shield.Detector can be that flicker is brilliant Body, liquid scintillator or plastic scintillant;Shield can be by materials such as quartz sand, concrete, steel, iron, copper, lead, cadmium, mercurys Constitute, the combination of generally several material.Whole-body counter is removed launches body to the artificial radionuclide taken in human body Interior gamma-rays, which is produced, counts outer, also counting can be produced to the gamma-rays of natural radionuclide, so as to influence detection manually to put The sensitivity of penetrating property nucleic.Accordingly, it would be desirable to which shield constructs one low Natural Radiation Level measuring chamber, it can be masked greatly Part cosmic ray and earth natural gamma radiation, make whole-body counter be in one low Natural Radiation Level environment, so that More accurately detect the level of artificial radionuclide.
However, there is a kind of naturally radioactive to be that shield can not be shielded, i.e. radon and its daughter.Radon is present in nature Natural radionuclide, constantly from rock, soil, earth's crust crack, building material separate out, although the α that radon is mainly launched Particle will not make whole-body counter produce counting, but radon constantly decays into a variety of radon daughters, and radon and its daughter are always deposited simultaneously .Most of radon daughters mainly launch gamma-rays, and the energy of γ ray of a variety of radon daughter transmittings mainly has 10.8keV (Pb- 210), 351.9keV (Pb-214), 609.4keV (Bi-214), 46.5keV (Pb-210) etc., they draw in whole-body counter Rise and count.In personnel receive during the measurement of irradiation whole-body counter, the door of measuring chamber is closed, and radon and its daughter exist Built up in confined space, cause concentration to raise;Concentration is higher, the meter that the gamma-rays that radon daughter is launched is caused in measurement spectrum Number is higher, interior irradiation whole-body counter is raised the minimum detectable activity (MDA) of artificial radionuclide, so as to be unfavorable for Judgement to measurement result.
The drop radon method of the existing low Natural Radiation Level measuring chamber of whole-body counter, generally radon ventilation method, example Such as use ventilation fan.Existing radon ventilation mode is air indoor circulation, and the advantage of indoor circulation is to make measurement indoor temperature It is relatively stable, but indoor radon concentration, higher than outdoor, domestic and international result of study generally illustrates if not taking control measure, general room The indoor radon concentration of room building will be higher than outdoor 3 to 10 times.Using radon consistence, higher air is originated as ventilation in itself, unfavorable In the reduction of measurement indoor radon concentration.
The content of the invention
The purpose of the present invention is a kind of drop radon system for low Natural Radiation Level measuring chamber, can effectively reduce Measure indoor radon concentration and radon daughter concentration.
In order to achieve this, in the embodiment on basis, the present invention provides one kind and surveyed for low Natural Radiation Level Measure the drop radon system of room, described drop radon system include measuring chamber, shield, shield door, air intake equipment, filtering adsorpting device, Ventilation shaft, air inlet, air outlet,
Described shield, and wherein one are provided with four surface side walls, top surface and the ground of described measuring chamber Shield door described in being provided with the wall of surface side, described shield is used to shield described measurement outdoor with described shield door Cosmic ray and earth natural gamma radiation enter described measuring chamber;
Described air intake equipment is from the external world, the institute being connected through described ventilation shaft and its end with described measuring chamber The air inlet stated is to described measurement room ventilation;
Described air outlet is arranged in described measuring chamber, for outwardly air draft;
The intake of described air inlet is more than the exhaust air rate of described air outlet;
Described filtering adsorpting device is arranged on described ventilation shaft, for the radon daughter in filtering inlet air, absorption Radon in air intake.
In a preferred embodiment, the present invention provides a kind of drop radon for low Natural Radiation Level measuring chamber System, wherein the material of described shield is the composite plate of steel plate, copper coin, stereotype and polyethylene board.
In a preferred embodiment, the present invention provides a kind of drop radon for low Natural Radiation Level measuring chamber System, wherein the filtering material in described filtering adsorpting device is glass fiber filter, sorbing material is cocoanut active charcoal.
In a kind of more preferred embodiment, the present invention provides a kind of for low Natural Radiation Level measuring chamber Radon system is dropped, wherein described filtering adsorpting device is designed as level Four purification, is respectively:It is big for filtering dust in air impurity The glass fibre primarily efficient filter (play a part of extend high efficiency particulate air filter life-span) of particle, for filtering radon daughter aerosol particle The glass fibre high efficiency filter, active carbon adsorber for adsorbing radon gas, described for preventing active carbon powder to be brought into The post-filter of measuring chamber.
In a preferred embodiment, the present invention provides a kind of drop radon for low Natural Radiation Level measuring chamber System, wherein described drop radon system also includes being arranged on the outdoor shield door side phase simultaneously with described measuring chamber of measurement Even malleation maintain passage room, for remain described measuring chamber in malleation.
In a kind of more preferred embodiment, the present invention provides a kind of for low Natural Radiation Level measuring chamber Radon system drops, wherein described drop radon system also includes the passage room door being arranged in described malleation maintenance passage room, it is described Shield door and described passage room door can not open simultaneously.
In a preferred embodiment, the present invention provides a kind of drop radon for low Natural Radiation Level measuring chamber System, wherein described drop radon system also includes the temperature sensor and/or humidity sensor being arranged in described measuring chamber, And it is arranged on described measurement outdoor temperature controller and/or humidity controller, described temperature controller/or humidity control Device processed is according to the temperature and/or humidity measurement results of described temperature sensor and/or humidity sensor to described measuring chamber Interior temperature and/or humidity is controlled, to keep constant.
In a kind of more preferred embodiment, the present invention provides a kind of for low Natural Radiation Level measuring chamber Radon system drops, wherein described temperature controller and/or humidity controller is arranged on air intake described on described ventilation shaft Before equipment.
In a preferred embodiment, the present invention provides a kind of drop radon for low Natural Radiation Level measuring chamber System, wherein described air intake equipment is high pressure positive blower, the air intake source for providing described ventilation shaft.
In a preferred embodiment, the present invention provides a kind of drop radon for low Natural Radiation Level measuring chamber System, wherein described drop radon system also includes the heat-insulation layer being arranged on outside described ventilation shaft, for described ventilation Air in pipeline is incubated.
The beneficial effects of the present invention are utilize the drop radon system for low Natural Radiation Level measuring chamber of the present invention System, can effectively reduce measurement indoor radon concentration and radon daughter concentration.
The drop radon system of the present invention dehumidifies and purified step by step, create one by from external environment air inducing, carrying out temperature adjustment Individual radon consistence is extremely low, and the stable low Natural Radiation Level measurement room environmental of humiture.
The drop radon system of the present invention by controlling radon to originate, divulge information, filter, adsorbing and method, can effectively reduce survey Measure indoor radon concentration and radon daughter concentration;Passage room ensures that the malleation in measuring chamber is maintained, and when personnel pass in and out measuring chamber, radon is dense Degree will not rise because opening door.In addition, sending into fresh air for measuring chamber, tested personnel's anoxic, unsmooth breath etc. can be also avoided to endanger Dangerous consequence;External temperature and humidity controller can make measurement indoor temperature and humidity not increasing on the premise of radioactive background in measuring chamber Suitably, increase tested personnel's comfort level, and provided for high purity germanium detector and Nal detector and can show superperformance Working environment.
Brief description of the drawings
Fig. 1 is the exemplary structure composition for dropping radon system for low Natural Radiation Level measuring chamber of the invention Figure.
Embodiment
The embodiment of the present invention is further illustrated below in conjunction with accompanying drawing.
The structure of the exemplary drop radon system for being used for low Natural Radiation Level measuring chamber of the invention as shown in figure 1, Passage room 5, Temperature Humidity Sensor 6 are maintained including high pressure positive blower 1, filtering adsorpting device 2, laboratory 3, shield 4, malleation, entered Air port 7, passage room door 8, temperature and humidity controller 9, ventilation shaft 10, heat-insulation layer 11, measuring chamber 12, shield door 13, air outlet 14.
Measuring chamber 12 is located in laboratory 3, and shield 4 is provided with its four surface sides wall, top surface and ground, and wherein A surface side wall on be provided with shield door 13, cosmic ray and ground that shield 4 is used for outside shield EMC measurement room 12 with shield door 13 Ball natural gamma radiation enters measuring chamber 12.The material of shield 4 is the composite plate of steel plate, copper coin, stereotype and polyethylene board, they It is the material for being difficult to separate out radon;And the seam crossing of the sheet material of shield 4 uses seamless welding technology, to avoid radon from being analysed from gap Go out into measuring chamber 12.
High pressure positive blower 1 is from the outer exhausting in laboratory 3, the air inlet being connected through ventilation shaft 10 and its end with measuring chamber 12 7 blow into measuring chamber 12.Ventilation shaft 10 is outer to set heat-insulation layer 11, for being incubated to the air in ventilation shaft 10.
On ventilation shaft 10, high pressure positive blower 1 is provided with filtering adsorpting device 2 below.Filtering adsorpting device 2 be used for adsorb into The radon daughter in radon, filtering inlet air in wind.Filtering material in filtering adsorpting device 2 is glass fiber filter, sorbing material For high-quality cocoanut active charcoal.Filtering adsorpting device 2 is designed as level Four purification, is respectively:For filtering dust in air impurity etc. The glass fibre primarily efficient filter (play a part of extend high efficiency particulate air filter life-span) of bulky grain, for filtering radon daughter aerosol Grain glass fibre high efficiency filter, the active carbon adsorber for adsorbing radon gas, for preventing active carbon powder to be brought into measurement The post-filter of room 12.High pressure positive blower 1 is encapsulated in the casing of 304 stainless steels with filtering adsorpting device 2, is turned into Main frame.In order to reduce the influence of noise produced during main frame exhausting, it need to make main frame as far as possible away from measuring chamber 12, so main frame is installed On the outer roof in laboratory 3.And one pressure difference instrument of installation, high-pressure mouth and low pressure port for monitoring filtering adsorpting device 2, when Pressure difference reaches 3 times of initial differential pressure, it is necessary to change the roughing efficiency air filter and high efficiency particulate air filter in filtering adsorpting device 2;Work as filtering Active carbon adsorber in adsorbent equipment 2 using after certain time, it is necessary to toasted, the radon gas of absorption in discharge activated carbon, Recover its adsorption capacity.
Air outlet 14 is arranged in measuring chamber 12, for outwardly air draft.The intake of air inlet 7 is more than air outlet 14 Exhaust air rate, so that it is malleation that relative measurement room 12 is outer in measuring chamber 12.
Volume, air inlet 7 and the aperture of air outlet 14, required rate of ventilation, filtering with reference to the inner space of measuring chamber 12 are inhaled The wind resistance of adsorption device 2, and the resistance and bend of ventilation shaft 10 are lost, and selection nominal air delivery is 100m3/ h high-pressure blast Machine 1.Empirical tests, use this 100m3/ h high pressure positive blowers 1 are under conditions of volume damper standard-sized sheet, and it is 3m that can make spatial volume3 Measuring chamber 12 in intake reach 64m3/ h, exhaust air rate 10.8m3/ h, rate of ventilation reaches 18 times/h.
Malleation maintains passage room 5 to be arranged in laboratory 3, in the outer shield door 13 1 simultaneously and on shield 4 of measuring chamber 12 Side is connected, for maintaining the malleation in measuring chamber 12.Malleation maintains passage room 5 to be provided with passage room door 8.Passage room door 8 and screen Covering increases linkage between door 13, prevents them from while opening.
Temperature and humidity controller 9 is arranged on the outer roof in laboratory 3, before high pressure positive blower 1.Air first passes through Temperature and Humidity Control Device 9, passes through temperature adjustment, into high pressure positive blower 1 and filtering adsorpting device 2, enters by ventilation shaft 10 again after cooling and dehumidifying Enter measuring chamber 12.Temperature setting scope is 22 DEG C -24 DEG C in measuring chamber 12.The Temperature Humidity Sensor 6 set in measuring chamber 12 is certainly The dynamic humiture that detects is after the scope set, with regard to automatic triggering temperature and humidity controller 9;Set when the humiture of measuring chamber 12 reaches When determining scope, temperature and humidity controller 9 is then automatically stopped work.
In the case of dropping two kinds of radon system by contrasting use/unuse, this hair is verified in the radon consistence change in measuring chamber 12 The drop radon effect of bright drop radon system.Radon consistence, BWLM-PLUS-S radon daughters instrument monitoring radon are monitored using RAD-7 emanometers Bulk concentration.The radon consistence of known nature is by temperature, humidity, atmospheric pressure, the influence of the natural conditions such as air quality, general table It is now that radon consistence is relatively low when fine air quality is good, radon consistence is higher when cloudy air quality is poor.Therefore with 2 kinds of more allusion quotations Publicly price-reduction radon effect for exemplified by Monitoring Data under the weather condition of type.Two kinds of weather conditions are condition 1 respectively:It is fine, Air quality is excellent;Condition 2:Cloudy day, air quality is intermediate pollution.
In weather condition 1, radon consistence is relatively low in natural environment, during without using drop radon system, to the radon in measuring chamber 12 Concentration and radon daughter concentration distinguish 24 hours of continuous monitoring and calculate average value, as a result, the radon consistence in measuring chamber 12 15.30Bq/m3, radon daughter concentration 4.37Bq/m3.It is minimum up to 2.84Bq/m in radon consistence 24 hours after drop radon system3, Average value 3.99Bq/m3, than without using reducing 73.9%;It is minimum up to 0.10Bq/m in radon daughter concentration 24 hours3, it is average Value 0.31Bq/m3, than without using reducing 92.9%.
In weather condition 2, radon consistence is higher in nature, during without using drop radon system, the radon consistence in measuring chamber 12 24 hourly average value 56.80Bq/m3, radon daughter 15.38Bq/m3.After drop radon system, radon consistence is minimum reachable in 24 hours 4.26Bq/m3, average value 8.22Bq/m3, than without using reducing 85.1%;It is minimum reachable in radon daughter concentration 24 hours 0.63Bq/m3, average value 0.83Bq/m3, than without using reducing 94.5%.
The drop radon principle for low Natural Radiation Level measuring chamber of the invention of above-mentioned example is as follows.
The 1st, radon method drops
By controlling radon source, ventilation, filtering, four kinds of methods of absorption to be combined the radon and radon that reach in reduction measuring chamber 12 The purpose of daughter concentration.
Control may make the factor that radon is produced in measuring chamber 12.Radon is main to be separated out by construction material, soil, underground.Therefore, The internal structure of measuring chamber 12 avoids using common buildings material, and uses the shielding for the material construction measuring chamber 12 for being difficult to separate out radon Body 4, and take measures to reduce precipitation of the radon from ground.Ventilation source is from outdoor, rather than radon consistence higher experiment in itself Air in room 3, is also to control one of the means in radon source.
Method of ventilation uses positive pressure method, the outer space pneumatic transmission of laboratory 3 is entered into measuring chamber 12 by high pressure positive blower 1, then air By the exhaust outlet discharge of two, 12 doorway of measuring chamber, to complete the ventilation in measuring chamber 12.Because intake is more than air output, measurement Air pressure is higher than the outer air pressure of measuring chamber 12 in room 12, in barotropic state.Positive draft method, can both prevent that radon and its daughter were poly- Collection, is also prevented from that measuring chamber 12 is outer, the high radon consistence air in laboratory 3 enters measuring chamber 12 by exhaust outlet 14.
Filter method is selection glass fiber filter, and the air for entering measuring chamber 12 is filtered, and can be filtered out absolutely Most of radon daughter aerosol, while playing a part of the larger particles such as dust in filtering external environment, prevents that measuring chamber 12 is dirty Dye.
Adsorption method is to use acticarbon, will filter the air after radon daughter and has once been adsorbed again, can have been inhaled Radon in attached air.
By filtering, absorption, the outer radon in air in laboratory 3 and daughter concentration are further reduced, and measurement is admitted to as fresh air Room 12, the ventilation for completing certain number of times interior per hour, you can radon and daughter concentration effectively in reduction measuring chamber 12.
2nd, malleation maintains passage room
In carrying out during irradiation whole body counting measurement, the screen of measuring chamber 12 is opened in measured personnel's turnover measuring chamber 12 Cover door 13.Open and be difficult in measuring chamber 12 maintain barotropic state after shield door 13, can cause that measuring chamber 12 is outer, radon in laboratory 3 The higher air blow back of concentration enters measuring chamber 12, causes radon and daughter concentration rise in measuring chamber 12, influence next bit personnel's Measurement.Therefore, devise with maintaining the malleation of positive pressure to maintain passage room 5, malleation maintains passage room 5 for before measuring chamber 12 Hold the extension of part.Increase linkage between passage room door 8 and shield door 13, linkage forbids passage room door 8 and shielding Door 13 is opened simultaneously.When personnel enter measuring chamber 12, malleation need to be introduced into and maintain passage room 5, only when passage room door 8 is closed Afterwards, shield door 13 could be opened;When personnel leave measuring chamber 12, also need to maintain passage room 5 by malleation, and shield door 13 is closed Afterwards, passage room door 8 could be opened.Thereby it is ensured that barotropic state can be maintained in measuring chamber 12, prevent the air of laboratory 3 from falling Flow into measuring chamber 12.
3rd, Intelligent external temperature and humidity controller
In the winter time and summer, the too low air temperature or too high introduced in measuring chamber 12, can cause two consequences:1) it is tested Personnel can feel cold, or sultry, or even trigger serious physiological maladies;2) environment temperature is too high will make high purity germanium detector Electric refrigeration low-temperature device operation power it is too high, cause higher noise signal, Nal detector can be because temperature change produces temperature Degree drift, declines detection performance.Especially in summer, because EAT is high, and shield door 13 close after in measuring chamber 12 into Compared with closing space, to add instrument and human-body radiating, quickly, therefore the too high problem of temperature is particularly acute rate of rise in temperature.
If the relative humidity that high pressure positive blower 1 introduces the outdoor air of measuring chamber 12 is big, 2 consequences can be caused:1) survey is made Measuring instrument in amount room 12 is made moist.2) it is used for the activity for adsorbing radon when the air humidity of air intake is big, in filtering adsorpting device 2 Micropore part inside activated carbon in layer of charcoal is taken by moisture content, will cause to inhale the decline of radon rate.
To solve the problems, such as to introduce the temperature and humidity brought of the outer air in laboratory 3, it is necessary to be that measuring chamber 12 increases humiture Adjustment equipment, and due to the particularity of whole-body counter measuring system, it is not possible to air-conditioning equipment is mounted directly in measuring chamber 12, Reason is:1) to require that the radioactive background level of environment reaches as far as possible minimum for whole-body counter measuring system, therefore need to avoid Increase any other articles in addition to the necessary devices such as detector, measurement bed into measuring chamber 12, to prevent from increasing radioactivity sheet Bottom;2) narrow space and more closed in measuring chamber 12, the noise and air quantity of air-conditioning equipment can produce bad shadow to tested personnel Ring.
Therefore the present invention devises the temperature and humidity controller 9 of Intelligent external, by condenser, evaporator, compressor, expansion valve Several major part compositions.Temperature Humidity Sensor 6 is set in measuring chamber 12, is connected with temperature and humidity controller 9.Work as humiture When the humiture that sensor 6 detects measuring chamber 12 exceeds the scope set in advance, with regard to automatic start, by outdoor air first through cold But dehumidify, then temperature adjustment is carried out to the dry air after dehumidifying.The temperature and humidity controller 9 of Intelligent external is in high pressure positive blower 1 Front end, air by temperature and humidity controller 9 carry out dehumidifying and temperature adjustment after enter high pressure positive blower 1 and filtering adsorpting device 2, And enter measuring chamber 12 through ventilation shaft 10.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention God and scope.So, if these modifications and variations to the present invention belong to the model of the claims in the present invention and its equivalent technology Within enclosing, then the present invention is also intended to comprising including these changes and modification.Above-described embodiment or embodiment are simply to the present invention For example, the present invention can also be implemented with other ad hoc fashions or other particular form, without departing from the present invention's Main idea or substantive characteristics.Therefore, it is regarded as from the point of view of the embodiment of description is in terms of any illustrative and non-limiting.This The scope of invention should be illustrated that any change equivalent with the intention and scope of claim should also be included by appended claims Within the scope of the invention.

Claims (10)

1. a kind of drop radon system for low Natural Radiation Level measuring chamber, it is characterised in that described drop radon system includes Measuring chamber, shield, shield door, air intake equipment, filtering adsorpting device, ventilation shaft, air inlet, air outlet,
Described shield, and a surface side wherein are provided with four surface side walls, top surface and the ground of described measuring chamber Described shield door is provided with wall, described shield is used to shield the outdoor universe of described measurement with described shield door Ray and earth natural gamma radiation enter described measuring chamber;
Described in described air intake equipment is connected from extraneous, through described ventilation shaft and its end with described measuring chamber Air inlet is to described measurement room ventilation;
Described air outlet is arranged in described measuring chamber, for outwardly air draft;
The intake of described air inlet is more than the exhaust air rate of described air outlet;
Described filtering adsorpting device is arranged on described ventilation shaft, for the radon daughter in filtering inlet air, absorption air intake In radon.
2. drop radon system according to claim 1, it is characterised in that:The material of described shield is steel plate, copper coin, lead The composite plate of plate and polyethylene board.
3. drop radon system according to claim 1, it is characterised in that:Filtering material in described filtering adsorpting device is Glass fiber filter, sorbing material is cocoanut active charcoal.
4. drop radon system according to claim 3, it is characterised in that:It is net that described filtering adsorpting device is designed as level Four Change, be respectively:For filtering the glass fibre primarily efficient filter of dust in air impurity bulky grain, for filtering radon daughter aerosol The glass fibre high efficiency filter of particle, the active carbon adsorber for adsorbing radon gas, for preventing active carbon powder to be brought into institute The post-filter for the measuring chamber stated.
5. drop radon system according to claim 1, it is characterised in that:Described drop radon system also includes being arranged on the survey Amount is outdoor and the malleation maintenance passage room that is connected with the shield door side of described measuring chamber, for remain described measuring chamber in Malleation.
6. drop radon system according to claim 5, it is characterised in that:Described drop radon system also includes being arranged on described Malleation maintains the passage room door in passage room, and described shield door and described passage room door can not be opened simultaneously.
7. drop radon system according to claim 1, it is characterised in that:Described drop radon system also includes being arranged on described Temperature sensor and/or humidity sensor in measuring chamber, and be arranged on the outdoor temperature controller of described measurement and/or Humidity controller, described temperature controller/or humidity controller are according to described temperature sensor and/or humidity sensor Temperature and/or humidity measurement results are controlled to the temperature and/or humidity in described measuring chamber, to keep constant.
8. drop radon system according to claim 7, it is characterised in that:Described temperature controller and/or humidity controller It is arranged on before air intake equipment described on described ventilation shaft.
9. drop radon system according to claim 1, it is characterised in that:Described air intake equipment is high pressure positive blower.
10. drop radon system according to claim 1, it is characterised in that:Described drop radon system is also described including being arranged on Ventilation shaft outside heat-insulation layer, for being incubated to the air in described ventilation shaft.
CN201710350050.6A 2017-05-17 2017-05-17 A kind of drop radon system for low Natural Radiation Level measuring chamber Active CN107219549B (en)

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CN104006447A (en) * 2014-05-15 2014-08-27 清华大学 Energy-saving air conditioner system capable of actively removing radon gas
CN204115078U (en) * 2014-05-15 2015-01-21 清华大学 The energy-saving air conditioning system of active removal radon gas
CN104215997A (en) * 2014-09-03 2014-12-17 北京市射线应用研究中心 Alpha and gamma dual-channel energy spectrum continuous monitoring method and alpha and gamma dual-channel energy spectrum continuous monitoring system
CN206793599U (en) * 2017-02-08 2017-12-26 杨宪民 A kind of abatement equipment of indoor decoration pollution gas

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