CN201488977U - Quick air radon concentration measuring device based on air impulse ionization chamber - Google Patents
Quick air radon concentration measuring device based on air impulse ionization chamber Download PDFInfo
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- CN201488977U CN201488977U CN2009200800567U CN200920080056U CN201488977U CN 201488977 U CN201488977 U CN 201488977U CN 2009200800567 U CN2009200800567 U CN 2009200800567U CN 200920080056 U CN200920080056 U CN 200920080056U CN 201488977 U CN201488977 U CN 201488977U
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Abstract
The utility model discloses a quick air radon concentration measuring device based on air impulse ionization chamber. The quick air radon concentration measuring device comprises a radon and daughter collecting device, an air impulse ionization chamber detector, a data collection and processing unit and a computer data analysis management module, wherein the radon and daughter collecting device is arranged in the air impulse ionization chamber detector, the output end of an air impulse ionization chamber is connected with the data collection and processing unit through a blocking capacitor, and the data collection and processing unit is connected with a computer through a USB interface. The quick air radon concentration measuring device can be widely applied in the field of indoor radiation environment radon level monitoring and pollution control in civil building engineering, has the characteristics of high sensitivity, stable stability, simple structure, low cost and the like, and is especially suitable for the application of quick high-sensitivity air radon concentration measurement.
Description
Technical field
The utility model relates to a kind of based on the quick air radon concentration monitoring of air pulse ionization chamber device, be specifically related to a kind of measurement that realizes the alpha emitter of radon in the air and daughter disintegration generation thereof, by realizing the quick measurement of balance radon concentration in the air behind the standard radon chamber scale.
Background technology
Radon is the gaseous state radioactive nuclide in the natural radioactivity decay series, and its decay product is again a kind of nonvolatile radiomaterial, in case be inhaled into human body, will cause damage and increase the possibility of bringing out lung cancer the human lung.Studies show that according to statistics Indoor Niton Pollution is to be only second to the 2nd big inducement that smoking causes lung cancer.For this reason, country has put into effect standard GB 50325-2001 " civil building engineering indoor environmental pollution control standard " and standard GB/T18883-2002 " IAQ (indoor air quality) standard ", has stipulated the requirement that Indoor Niton is detected.Because airborne radon concentration is relatively very faint, existing air emanometer, because himself detection sensitivity, radon daughter pollute and factor affecting such as surrounding air humiture, when carrying out the air radon concentration monitoring, when measurement stability is relatively poor, also often need the long cumulative measurement time.Especially the influence of radon daughter pollution and detection sensitivity makes existing emanometer be difficult to obtain radon concentration information in the air fast, thereby has brought inconvenience to work in a way.A kind of based on the quick air radon concentration monitoring of air pulse ionization chamber device at civil building engineering indoor radiation environment radon level monitoring and pollute the control field, especially survey the radon field and have broad application prospects at air fast.
The utility model content
The purpose of this utility model provides a kind of and based on the air pulse ionization chamber airborne radon concentration is carried out rapid measurement device, this device is at the quick Testing requirement of radon concentration in the present air, select for use the air pulse ionization chamber as detector, have the detection efficiency height, measure highly sensitive characteristics; The radon and the daughter gathering-device thereof that adopt anti-radon daughter to pollute are collected airborne radon and daughter thereof fast, and cooperate the air pulse ionization chamber to carry out radon concentration monitoring in the air, can effectively overcome the pollution of radon daughter, thereby reach quick measurement purpose the ionization chamber detector; Data acquisition and processing unit are introduced the temperature and humidity measurement of surrounding air, can effectively revise the influence of humiture to radon concentration, make the measurement data of air radon concentration more stable.Simultaneously should based on air pulse ionization chamber air radon concentration rapid measurement device also have simple and reasonable, volume is little, advantage such as low in energy consumption, cheap, easy to use.
For reaching the foregoing invention purpose, the technical scheme that is adopted is: a kind of based on the quick air radon concentration monitoring of air pulse ionization chamber device, it is characterized in that: comprise radon and daughter gathering-device thereof, air pulse ionization chamber detector, data acquisition and processing (DAP) unit, computer data analysis management.Described radon and daughter gathering-device thereof are positioned over air pulse ionization chamber detector inside, and described air pulse ionization chamber output terminal is connected with the data acquisition and processing (DAP) unit, and described data acquisition and processing (DAP) unit links to each other with computing machine by USB interface.
According to the utility model provide a kind of based on the quick air radon concentration monitoring of air pulse ionization chamber device, it is characterized in that: radon and daughter gathering-device thereof are column type insulation cavity.
According to the utility model provide a kind of based on the quick air radon concentration monitoring of air pulse ionization chamber device, it is characterized in that: it is inner and replaceable that radon and daughter gathering-device thereof are positioned over air pulse ionization chamber detector.One end of air pulse ionization chamber detector is equipped with anti-electromagnetic screen net (7) and sticks on the anti-electromagnetic screen lid that insulating material (8) is gone up common composition, anti-electromagnetic screen net was connected with ionization chamber high pressure chest wall (5) when anti-electromagnetic screen lid built ionization chamber, and left radon diffusion hole (6).
According to the utility model provide a kind of based on the quick air radon concentration monitoring of air pulse ionization chamber device; it is characterized in that: protection ring connects the signal collection electrode by the low noise metal carbon resister R of big resistance; air pulse ionization chamber detector high pressure chest wall connects negative high voltage, and the signal collection electrode is connected with low noise charge sensitive preamplifier in the data acquisition and processing (DAP) unit by capacitance C.The signal collection electrode links to each other by insulating material with the high pressure chest wall with protection ring and protection ring.
According to the utility model provide a kind of based on the quick air radon concentration monitoring of air pulse ionization chamber device, it is characterized in that: the data acquisition and processing (DAP) unit comprises microprocessor system, temperature humidity observation circuit, real-time clock, low-power dissipation power supply administration module and OLED display interface, keyboard interface, usb communication interface on low noise charge sensitive preamplifier, signal condition shaping circuit, the sheet.
By top narration as can be seen, the utlity model has following advantage: on detector is selected, select the air pulse ionization chamber for use, cost is low, detection efficiency is high, measurement is highly sensitive; On structural design, designed radon and daughter gathering-device thereof that anti-radon daughter pollutes, be used for collecting radon and daughter thereof in the air specially, therefore can reach quick measurement purpose; On system performance, adopt the low-power dissipation power supply design proposal, and adopt up-to-date OLED display technique; This air radon concentration monitoring device leaves USB interface, conveniently is connected with the background data base of computing machine, so that the unified management of data and analysis; On technical indicator, measure sensitivity and be better than 10Bq/m
3/ 1cpm, its measuring accuracy＜10%, stability＜± 15%, Overall Power Consumption＜200mW.
Description of drawings
Fig. 1 for the utility model provide based on air pulse ionization chamber air radon concentration rapid measurement device pie graph.
Fig. 2 for the utility model provide based on air pulse ionization chamber and radon and daughter gathering-device structural drawing thereof in the air pulse ionization chamber air radon concentration rapid measurement device.
Wherein: (1) insulating material; (2) protection is bad; (3) signal collection electrode; (4) radon and daughter gathering-device thereof; (5) ionization chamber high pressure chest wall; (6) radon diffusion hole; (7) anti-electromagnetic screen net; (8) insulating material;
The schematic block circuit diagram that Fig. 3 provides for the utility model based on data acquisition and processing (DAP) unit in the air pulse ionization chamber air radon concentration rapid measurement device.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described:
Fig. 1 for the utility model provide based on air pulse ionization chamber air radon concentration rapid measurement device pie graph.It is characterized in that: comprise radon and daughter gathering-device thereof, air pulse ionization chamber detector, data acquisition and processing (DAP) unit, computer data analysis management.Described radon and daughter gathering-device thereof are positioned over air pulse ionization chamber detector inside, and described air pulse ionization chamber output terminal is connected with the data acquisition and processing (DAP) unit, and described data acquisition and processing (DAP) unit links to each other with computing machine by USB interface.
Be based on its principle of work of air pulse ionization chamber air radon concentration rapid measurement device: in a stable space, radon and daughter thereof are in the radioactivity dynamic balance state.Radon and daughter generation alpha-decay thereof radiate the α particle, and according to the radioactive equilibrium theory, radon concentration is directly proportional with these α populations.The α particle is the positively charged heavy particle, has very strong ionized air ability.When α particle ionized air, can in air, form a large amount of electron-hole pairs, under the effect of high-voltage electric field, these electronics-holes can be on the signal collection electrode (3) accumulation and form pulse signal, after amplifying by subsequent conditioning circuit again in the record unit time quantity of pulse signal determine airborne radon concentration.
Fig. 2 for the utility model provide based on air pulse ionization chamber and radon and daughter gathering-device structural drawing thereof in the air pulse ionization chamber air radon concentration rapid measurement device.The anti-electromagnetic screen lid that it mainly is made up of cylindrical metal cavity (5), protection ring (2), dead ring (1), signal collection electrode (3), anti-electromagnetic screen net (7) and insulating material (8) and the radon and daughter gathering-device (4) the several sections formation thereof of anti-daughter pollution.
The ionization chamber cavity wall is the metallic conduction tube type material; The signal collection electrode is gold-plated on the copper product surface, thereby makes probe have higher conductance.Protection ring is received on the signal passive electrode by the low noise metal carbon resister of big resistance, and protection ring is directly received systematically and gone up.At this moment, the signal collection electrode can be approximately ground level;
Radon and daughter gathering-device thereof at ordinary times not the time spent desirablely go out and be in sealing state, can think that it innerly is no radon space.When measuring, open close mouth, radon and daughter meeting free in the measurement environment air are diffused into its inside very soon, and its inner radon concentration can reach consistent with environment very soon.It is packed in the ionization chamber and with metal net shaped sealing ionization chamber space, airborne radon and daughter thereof still can be diffused into ionization chamber inside by diffusion hole (6) under external force effects such as concentration difference, and can reach balance very soon.Simultaneously, in ionization chamber inside
222Rn and
218Po can start measurement after keeping radioactivity mobile equilibrium.The α particle that the radon daughter that adsorbs on the locular wall of ionization simultaneously radiates is difficult to penetrate radon and daughter collector chamber wall enters the air ionization district, and the α particle counting that at this time records is the radon of radon and daughter collection chamber interior volume thereof and the α particle of daughter disintegration thereof.
When radon and daughter gathering-device thereof are packed air pulse ionization chamber cavity into, will prevent that the electromagnetic screen lid is installed in the ionization chamber opening part, anti-electromagnetic screen lid sticks on the insulating material surface for the net metal material, and diffusion porosity is arranged on the insulating material; The signal collection electrode is received systematically by the low noise metal carbon resister of big resistance and is gone up, because the ionization chamber cavity connects negative high voltage, therefore forms a positive electric field between signal collection electrode and ionization chamber cavity.The α particle ionized air that radon and daughter disintegration thereof in ionization chamber inside produces forms electron-hole pair, because an electron is negatively charged, therefore the signal collection electrode can be collected these electronics and produce a pulse signal (very faint), C is input to low noise charge sensitive preamplifier by capacitance, is amplified so that the subsequent conditioning circuit record by it.
Fig. 3 for the utility model provide based on the data acquisition and processing (DAP) element circuit theory diagram in the air pulse ionization chamber air radon concentration rapid measurement device.Comprise microprocessor system, temperature humidity observation circuit, real-time clock, low-power dissipation power supply administration module and OLED display interface, keyboard interface, usb communication interface on low noise charge sensitive preamplifier, signal condition shaping circuit, the sheet.When the incident of a α particle and when acting on the sensitive volume of ionization chamber inner air, can produce electron-hole pair by ionized air, under the effect of high-voltage electric field, air pulse ionization chamber signal collection electrode is collected the electron-hole pair of these ionization, after low noise charge sensitive preamplifier amplification and signal conditioning circuit processing, by the counting circuit record of microprocessor system, on the OLED display screen, show the count value in the corresponding time simultaneously.When measurement finishes, according to correction factors such as the scale equation of instrument and humitures, just can obtain corresponding radon concentration in the air again.Can pass through USB interface, the data of measuring are sent on the computing machine, carry out unified Analysis and management by computing machine.
Though described embodiment of the present utility model in conjunction with the accompanying drawings, the protection domain that those of ordinary skills do not need various distortion that creativity work just can make or modification still to belong to this patent within the scope of the appended claims.
Claims (5)
1. one kind based on the quick air radon concentration monitoring of air pulse ionization chamber device, it is characterized in that: comprise radon and daughter gathering-device thereof, air pulse ionization chamber detector, data acquisition and processing (DAP) unit, computer data analysis management module, described radon and daughter gathering-device thereof are positioned over air pulse ionization chamber detector inside, described air pulse ionization chamber output terminal is connected with the data acquisition and processing (DAP) unit, and described data acquisition and processing (DAP) unit links to each other with computing machine by USB interface.
2. according to claim 1 a kind of based on the quick air radon concentration monitoring of air pulse ionization chamber device, it is characterized in that: radon and daughter gathering-device (4) thereof are the column type plastic chamber.
3. according to claim 1 a kind of based on the quick air radon concentration monitoring of air pulse ionization chamber device, it is characterized in that: it is inner and replaceable that radon and daughter gathering-device thereof are positioned over air pulse ionization chamber detector, one end of air pulse ionization chamber detector is equipped with anti-electromagnetic screen net (7) and sticks on the anti-electromagnetic screen lid that insulating material (8) is gone up common composition, anti-electromagnetic screen net was connected with ionization chamber high pressure chest wall (5) when anti-electromagnetic screen lid built ionization chamber, and left radon diffusion hole (6).
4. according to claim 1 a kind of based on the quick air radon concentration monitoring of air pulse ionization chamber device; it is characterized in that: protection ring (2) connects signal collection electrode (3) by the low noise metal carbon resister R of big resistance; the ionization chamber high pressure chest wall (5) of air pulse ionization chamber detector connects negative high voltage; the signal collection electrode is connected with low noise charge sensitive preamplifier in the data acquisition and processing (DAP) unit by capacitance C, and the signal collection electrode links to each other by insulating material (1) with the high pressure chest wall with protection ring and protection ring.
5. described a kind of based on the quick air radon concentration monitoring of air pulse ionization chamber device based on claim 1, it is characterized in that: the data acquisition and processing (DAP) unit comprises microprocessor system, temperature humidity observation circuit, real-time clock, low-power dissipation power supply administration module, OLED display interface, keyboard interface and usb communication interface on low noise charge sensitive preamplifier, signal condition shaping circuit, the sheet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200800567U CN201488977U (en) | 2009-04-07 | 2009-04-07 | Quick air radon concentration measuring device based on air impulse ionization chamber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200800567U CN201488977U (en) | 2009-04-07 | 2009-04-07 | Quick air radon concentration measuring device based on air impulse ionization chamber |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102768234A (en) * | 2012-08-15 | 2012-11-07 | 成都理工大学 | Double-ionization-chamber accumulative method for measuring radon gas in soil |
| CN103257356A (en) * | 2013-05-20 | 2013-08-21 | 中国工程物理研究院核物理与化学研究所 | Measuring device and measuring method for tritium concentration in sealed container |
| CN103439398A (en) * | 2013-09-06 | 2013-12-11 | 北华航天工业学院 | Radon detection system and method based on fuzzy logic |
| CN103487824A (en) * | 2013-09-26 | 2014-01-01 | 东华理工大学 | Radon daughter sampling device based on high-voltage corona discharge |
| CN105738937A (en) * | 2016-04-29 | 2016-07-06 | 成都理工大学 | Static alpha-cup multifunctional emanometer |
| US9576776B2 (en) | 2012-10-30 | 2017-02-21 | University Of Sussex | Apparatus for sensing ionic current |
| CN107121488A (en) * | 2017-04-28 | 2017-09-01 | 浙江大学 | Gas phase alkali metal on-line measurement device in a kind of coal-fired flue-gas |
| CN109991645A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | Detection efficient in thorium emanation cumulative measurement method determines method |
| CN113238272A (en) * | 2021-04-27 | 2021-08-10 | 赛睿环仪(北京)科技有限公司 | Radon exhalation rate measuring instrument |
-
2009
- 2009-04-07 CN CN2009200800567U patent/CN201488977U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102768234A (en) * | 2012-08-15 | 2012-11-07 | 成都理工大学 | Double-ionization-chamber accumulative method for measuring radon gas in soil |
| US9576776B2 (en) | 2012-10-30 | 2017-02-21 | University Of Sussex | Apparatus for sensing ionic current |
| CN103257356A (en) * | 2013-05-20 | 2013-08-21 | 中国工程物理研究院核物理与化学研究所 | Measuring device and measuring method for tritium concentration in sealed container |
| CN103439398A (en) * | 2013-09-06 | 2013-12-11 | 北华航天工业学院 | Radon detection system and method based on fuzzy logic |
| CN103487824A (en) * | 2013-09-26 | 2014-01-01 | 东华理工大学 | Radon daughter sampling device based on high-voltage corona discharge |
| CN103487824B (en) * | 2013-09-26 | 2016-07-06 | 东华理工大学 | A kind of radon daughter sampling apparatus based on high-voltage corona discharge |
| CN105738937A (en) * | 2016-04-29 | 2016-07-06 | 成都理工大学 | Static alpha-cup multifunctional emanometer |
| CN107121488A (en) * | 2017-04-28 | 2017-09-01 | 浙江大学 | Gas phase alkali metal on-line measurement device in a kind of coal-fired flue-gas |
| CN107121488B (en) * | 2017-04-28 | 2019-09-03 | 浙江大学 | Gas phase alkali metal on-line measurement device in a kind of coal-fired flue-gas |
| CN109991645A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | Detection efficient in thorium emanation cumulative measurement method determines method |
| CN109991645B (en) * | 2017-12-31 | 2023-02-17 | 中国人民解放军63653部队 | Detection efficiency determination method in thorium emanation accumulation measurement method |
| CN113238272A (en) * | 2021-04-27 | 2021-08-10 | 赛睿环仪(北京)科技有限公司 | Radon exhalation rate measuring instrument |
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Granted publication date: 20100526 Termination date: 20120407 |