CN105353397A - Radon and thoron continuous measurement device and method based on static collection method - Google Patents
Radon and thoron continuous measurement device and method based on static collection method Download PDFInfo
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- CN105353397A CN105353397A CN201510666644.9A CN201510666644A CN105353397A CN 105353397 A CN105353397 A CN 105353397A CN 201510666644 A CN201510666644 A CN 201510666644A CN 105353397 A CN105353397 A CN 105353397A
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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
- G01T1/167—Measuring radioactive content of objects, e.g. contamination
Abstract
The invention relates to a radon and thoron continuous measurement device and method based on a static collection method, and the device comprises a static collection chamber; a daughter filter which is disposed in an input pipe and is close to an inlet of the input pipe; a sucking pump which is communicated with an output pipe; a detector which is disposed on an inner wall of the static collection chamber and is opposite to the input pipe; a temperature and humidity sensor which is disposed in the static collection chamber; a signal and data processing system which is connected with the detector and the temperature and humidity sensor; and a display system which is connected with the temperature and humidity sensor and the signal and data processing system. The device can complete the quick, direct and continuous measurement of concentration of radon and thoron at a working place and in a working environment under the condition that there is no need of a drying agent for the drying of air.
Description
Technical field
The present invention relates to a kind of radon in workplace and environment and thoron monitoring technology, particularly relate to a kind of radon based on static collection and thoron continuous measuring device and method.
Background technology
Radon (namely
222rn) with thoron (namely
220rn) belong to radioactivity inert gas, be one of main source of natural radiation irradiation, almost just there is thoron in the place that there is radon.But much less is wanted in the concern of people to thoron in environment and daughter harm thereof.Report according to UNSCEAR2000, in natural radiation produces the public year effective dose, the dosage of Radon and its descendants accounts for 50% of total effective dose, and the ratio of the effective dose that thoron and daughter thereof produce and Radon and its descendants dosage brings up to 9% by original 6%.And the research of the hazard assessment of Environmental Radon and thoron and daughter and behavioural characteristic thereof all be unable to do without radon and thoron and daughter is measured.Therefore, continuous, stable, the measurement reliably of radon and thoron are the keys realizing radon and thoron hazard assessment.
Mixing radon conventional at present and thoron method for continuous measuring comprise: Double Filter, scintillation chamber's time expander method, solid state nuclear track horizontal survey method, activated carbon box method, active carbon filter paper method, static collection.And the device volume wherein realizing Double Filter is larger, heavy, and disturb excessive; Although nuclear track method and activated carbon box method accuracy high, Measuring Time is oversize; Static collection is adapted to continuously and transient measurement, and can the change of monitoring of environmental radon and thoron concentration continuously, but its shortcoming is electrostatic field is subject to the impact of air humidity comparatively greatly, needs drying agent to carry out dehumidifying or humidity correction.
Summary of the invention
In order to solve above-mentioned prior art Problems existing, the present invention aims to provide a kind of radon based on static collection and thoron continuous measuring device and method, directly to measure radon and thoron concentration under mixing radon and thoron measurement environment, and do not need drying agent to carry out drying to air, realize the continuous monitoring to workplace and Environmental Radon and thoron concentration level.
A kind of radon based on static collection that one of the present invention is described and thoron continuous measuring device, it comprises:
Electrostatic collection room, it is communicated with an input pipe and an efferent duct;
To be arranged in described input pipe and near the daughter filtrator of its inlet end;
The aspiration pump be communicated with described efferent duct, the air containing mixing radon and thoron from electrostatic collection room described in described input pipe suction, produces to decay at the indoor collection radon of this electrostatic collection by it
218po particle and thoron decay produce
216po particle;
Be arranged on detector in described electrostatic collection chamber interior walls and relative with described input pipe, described in its detection
218po particle decay produce 6.00MeV a α particle and described in
216the 2nd α particle of the 6.78MeV that Po particle decay produces, and export corresponding detectable signal;
Be arranged on the Temperature Humidity Sensor of described electrostatic collection indoor, it is measured the humiture of described electrostatic collection indoor and exports corresponding temperature-humidity signal;
The signal and data processing system be connected with described detector and Temperature Humidity Sensor; And
The display system be connected with described Temperature Humidity Sensor and signal and data processing system;
Wherein, described signal and data processing system comprises:
Signal amplification module, it receives and amplifies described detectable signal;
The analog-to-digital conversion module be connected with described signal amplification module, it carries out analog to digital conversion to the described detectable signal after amplification and exports corresponding switching signal;
The particle counting module be connected with described analog-to-digital conversion module, it is screened a described α particle and the 2nd α particle according to described switching signal, and obtains the count value of a α particle and the count value of the 2nd α particle respectively;
With the overlap of peaks correcting module of described particle counting model calling, its count value of a α particle and count value of the 2nd α particle according to the overlap of peaks factor pair preset carry out overlap of peaks correction;
The iterated revision module be connected with described overlap of peaks correcting module, it adopts iterative amendment act and carries out iterated revision according to the revised count value of a described α particle of iterated revision factor pair overlap of peaks preset and the count value of the 2nd α particle;
With the humiture correcting module of described iterated revision model calling, it carries out humiture correction according to described temperature-humidity signal and default Temperature and humidity to the count value of a described α particle after iterated revision and the count value of the 2nd α particle; And
The concentration calculation module be connected with described humiture correcting module, it calculates according to the count value of the count value of the revised described α particle of humiture and the 2nd α particle the concentration value obtaining radon and thoron, and exports the concentration value of this radon and thoron to described display system for its storage and display.
In the above-mentioned radon based on static collection and thoron continuous measuring device, described display system comprises: the database be connected with described Temperature Humidity Sensor and concentration calculation module, respectively with the data disaply moudle of described DataBase combining, data inquiry module and data removing module, the touch display screen be connected with described data disaply moudle, data inquiry module and data removing module and the parameter setting module be connected with described touch display screen.
In the above-mentioned radon based on static collection and thoron continuous measuring device, described device also comprises the power module for powering to described electrostatic collection room, aspiration pump, detector, Temperature Humidity Sensor, signal and data handling system and display system.
In the above-mentioned radon based on static collection and thoron continuous measuring device, described aspiration pump is also communicated with a gas outlet.
In the above-mentioned radon based on static collection and thoron continuous measuring device, described detector is ion implantation surface passivation detector.
In the above-mentioned radon based on static collection and thoron continuous measuring device, containing glass fiber filter in described daughter filtrator.
In the above-mentioned radon based on static collection and thoron continuous measuring device, described aspiration pump is the electromagnetic masking constant current aspiration pump of flow rate range at 3 ~ 6L/min.
In the above-mentioned radon based on static collection and thoron continuous measuring device, chamber measured by the aluminium alloy of to be volume be in described electrostatic collection room 1.5L.
A kind of radon based on static collection described in two of the present invention and thoron method for continuous measuring, it comprises the following steps:
Step S1, provides as the radon based on static collection in claim 1-8 as described in any one and thoron continuous measuring device;
Step S2, by described aspiration pump by electrostatic collection room described in the air suction containing mixing radon and thoron, adopts static collection to produce in the indoor collection radon decay of this electrostatic collection
218po particle and thoron decay produce
216po particle;
Step S3, is detected by described detector
218po particle decay produce 6.00MeV a α particle and
216the 2nd α particle of the 6.78MeV that Po particle decay produces, and export corresponding detectable signal;
Step S4, is amplified described detectable signal by described signal amplification module;
Step S5, is carried out analog to digital conversion by described analog-to-digital conversion module to the described detectable signal after amplification and exports corresponding switching signal;
Step S6, is screened a described α particle and the 2nd α particle according to described switching signal by described particle counting module, and obtains the count value of a α particle and the count value of the 2nd α particle respectively;
Step S7, carries out overlap of peaks correction by described overlap of peaks the correcting module count value of a α particle and count value of the 2nd α particle according to the overlap of peaks factor pair preset;
Step S8, adopts iterative amendment act by described iterated revision module and carries out iterated revision according to the revised count value of a described α particle of iterated revision factor pair overlap of peaks preset and the count value of the 2nd α particle;
Step S9, measure the humiture of described electrostatic collection indoor by described Temperature Humidity Sensor and export corresponding temperature-humidity signal, and according to described temperature-humidity signal and default Temperature and humidity, humiture correction being carried out to the count value of a described α particle after iterated revision and the count value of the 2nd α particle by described humiture correcting module; And
Step S10, calculate according to the count value of the count value of the revised described α particle of humiture and the 2nd α particle the concentration value obtaining radon and thoron by described concentration calculation module, and export the concentration value of this radon and thoron to described display system for its storage and display.
Owing to have employed above-mentioned technical solution, the present invention by adopting aspiration pump sampling, make containing mixing radon and thoron air with certain flow velocity through daughter filtrator laggard enter electrostatic collection room, thus make the positively charged that radon and thoron decay produce
218po particle and
216po particle is adsorbed onto detector surface under the effect of electrostatic field, then detects its surface by detector
218po particle and
216po particle decay further produce a α particle of 6.00MeV and the 2nd α particle of 6.78MeV, and binding signal and data handling system identify first, second α particle and count respectively, then obtain the concentration value of radon and thoron after overlap of peaks correction, iterated revision and humiture correction being carried out to these count values, thus while completing workplace and Environmental Radon and thoron concentration when not needing drying agent air to be carried out to drying, fast, directly, continuous coverage.
Accompanying drawing explanation
Fig. 1 is a kind of radon based on static collection of one of the present invention and the structural representation of thoron continuous measuring device;
Fig. 2 is the structured flowchart of signal and data processing system in a kind of radon based on static collection of one of the present invention and thoron continuous measuring device;
Fig. 3 is the structured flowchart of display system in a kind of radon based on static collection of one of the present invention and thoron continuous measuring device.
Embodiment
Below in conjunction with accompanying drawing, provide preferred embodiment of the present invention, and be described in detail.
Refer to Fig. 1-3, one of the present invention, i.e. a kind of radon based on static collection and thoron continuous measuring device, comprising:
Electrostatic collection room 1, it is communicated with an input pipe 11 and an efferent duct 12;
To be arranged in input pipe 11 and near the daughter filtrator 2 of its inlet end;
Be communicated with efferent duct 12 and the aspiration pump 3 be communicated with a gas outlet 31, the air containing mixing radon and thoron from input pipe 11 suction electrostatic collection room 1, produces with collection radon decay in this electrostatic collection room 1 by it
218po particle and thoron decay produce
216po particle;
Be arranged on detector 4 on the inwall of electrostatic collection room 1 and relative with input pipe 11, its detection
218po particle decay produce 6.00MeV a α particle and
216the 2nd α particle of the 6.78MeV that Po particle decay produces, and export corresponding detectable signal;
Be arranged on the Temperature Humidity Sensor 5 in electrostatic collection room 1, the humiture in its measurement of electrostatic collecting chamber 1 also exports corresponding temperature-humidity signal;
The signal and data processing system 6 be connected with detector 4 and Temperature Humidity Sensor 5;
The display system 7 be connected with Temperature Humidity Sensor 5 and signal and data processing system 6; And
For to electrostatic collection room 1, aspiration pump 3, detector 4, Temperature Humidity Sensor 5, signal and data handling system 6 and the display system 7 power module (not shown) of powering.
Specifically, signal and data processing system 6 comprises:
The signal amplification module 61 be connected with detector 4, it receives and amplifies detectable signal;
The analog-to-digital conversion module 62 be connected with signal amplification module 61, it carries out analog to digital conversion to the detectable signal after amplification and exports corresponding switching signal;
The particle counting module 63 be connected with analog-to-digital conversion module 62, it is screened a α particle and the 2nd α particle according to switching signal, and obtains the count value of a α particle and the count value of the 2nd α particle respectively;
The overlap of peaks correcting module 64 be connected with particle counting module 63, it carries out overlap of peaks correction according to the count value of overlap of peaks factor pair the one α particle preset and the count value of the 2nd α particle;
The iterated revision module 65 be connected with overlap of peaks correcting module 64, it adopts iterative amendment act and carries out iterated revision according to the count value of the revised α particle of iterated revision factor pair overlap of peaks preset and the count value of the 2nd α particle;
The humiture correcting module 66 be connected with iterated revision module 65, it carries out humiture correction according to the temperature-humidity signal of Temperature Humidity Sensor 5 output and default Temperature and humidity to the count value of the α particle after iterated revision and the count value of the 2nd α particle; And
The concentration calculation module 67 be connected with humiture correcting module 66, it calculates according to the count value of the count value of the revised α particle of humiture and the 2nd α particle the concentration value obtaining radon and thoron, and exports the concentration value of this radon and thoron to display system 7 for its storage and display.
Display system 7 comprises: the database 71 be connected with Temperature Humidity Sensor 5 and concentration calculation module 67, (it is mainly used in display measurement time schedule to the data disaply moudle 72 be connected with database 71 respectively, measuring period value, the concentration value of radon and thoron, displays temperature, humidity and current time etc.), (it is mainly used in Query Dates to data inquiry module 73, time, radon consistence value, thoron concentration value, temperature during measurement, humidity, measuring period etc.) and data removing module 74 (it is mainly used in deleting of that month data and whole divided data etc.), with data disaply moudle 72, (it is mainly used in arranging measuring period for the touch display screen 75 that data inquiry module 73 is connected with data removing module 74 and the parameter setting module 76 that is connected with touch display screen 75, instrument scale factor is arranged, instrument parameter only just can modify and arrange when carrying out scale).
In the present embodiment, chamber measured by the aluminium alloy of to be volume be in electrostatic collection room 1 about 1.5L, and carried out black conductive oxidation technology to it, to reduce the interference of illumination to the probe of detector 4; Containing glass fiber filter in daughter filtrator 2, its filtration efficiency is 99.9%; Aspiration pump 3 is the electromagnetic masking constant current aspiration pump of flow rate range at 3 ~ 6L/min, and it can reduce the interference of aspiration pump 104 to probe particle counting; Detector 4 is ion implantation surface passivation (PIPS) detector; In addition, the design of isolated from power is also adopted (such as to adopt prime amplifier and detector to form probe portion further, to reduce the background noise of circuit generation between detector and prime amplifier to the impact of measuring-signal in the present invention; By aspiration pump away from detector, and material object is set between isolates; The PIPS of low noise detects booster power design) to reduce power initiation and the interference of air pump vibrations to the probe of detector 4; Touch display screen 75 is for having 5 cun of color screen displays of touch function.
Principle of work of the present invention, i.e. a kind of radon based on static collection of the present invention two and thoron method for continuous measuring, comprise the following steps:
Step S1, provides the radon based on static collection and the thoron continuous measuring device of said structure;
Step S2, will containing mixing radon and the air of thoron with certain flow velocity suction electrostatic collection room 1 after efficient daughter filtrator 2 by aspiration pump 3, adopts static collection this electrostatic collection room 1 in, collects radon and to decay generation
218po particle and thoron decay produce
216po particle (above-mentioned air is discharged via aspiration pump 3 and gas outlet 31 subsequently);
Step S3, is detected by detector 4
218po particle decay produce 6.00MeV a α particle and
216the 2nd α particle of the 6.78MeV that Po particle decay produces, and export corresponding detectable signal;
Step S4, is amplified detectable signal by signal amplification module 61;
Step S5, is carried out analog to digital conversion by analog-to-digital conversion module 62 to the detectable signal after amplification and exports corresponding switching signal;
Step S6, is screened a α particle and the 2nd α particle according to switching signal by particle counting module 63, and obtains the count value of a α particle and the count value of the 2nd α particle respectively;
Step S7, carries out overlap of peaks correction by overlap of peaks correcting module 64 according to the count value of overlap of peaks factor pair the one α particle preset and the count value of the 2nd α particle; Specifically, owing to adopting PIPS detector to the first generation daughter of radon
218the α particle of 6.00MeV that Po particle produces and the first generation daughter of thoron
216when the 2nd α particle of the 6.78MeV that Po particle produces detects, the α particle of the latter is due to energy loss, and the hangover reducing direction toward energy appears in its power spectrum summit, namely has part
216the 2nd α particle that Po particle produces enters
218the energy district of the 6.00MeV that Po particle produces, thus cause high-energyα-particle to count reduction, low energy alpha particle counting increases (overlap of peaks of alpha energy spectrum is subject to the impact of many factors, and these factors comprise: aerocolloidal concentration the etc. when self absorption factor of measuring condition, detector charactorizations, filter membrane, sampling); No matter but how radon, thoron concentration separately changes, Progeny of thoron
216the distributed areas of the 2nd α particle of the 6.78MeV that Po particle produces can be thought to determine, corresponding overlap factor is also determined, namely
216the 2nd α particle of the 6.78MeV that Po particle produces falls into
218the population in the energy district of the 6.00MeV that Po particle produces accounts for
216the ratio of total α population of the 6.78MeV that Po particle produces is determined, so can realize by introducing the overlap peak factor
218po particle produce 6.00MeV a α particle counting with
216the overlap of peaks correction of the 2nd α particle counting of the 6.78MeV that Po particle produces, eliminates overlap of peaks to the impact of measurement result;
Step S8, adopt iterative amendment act by iterated revision module 65 and carry out iterated revision according to the count value of the revised α particle of iterated revision factor pair overlap of peaks preset and the count value of the 2nd α particle, thus eliminate to measure several times before in the continuous coverage of radon and thoron residual
218po particle,
216first, second α particle counting that Po particle produces is measured when secondary
218po particle,
216the impact of first, second α particle counting that Po particle produces;
Step S9, export corresponding temperature-humidity signal by the humiture in Temperature Humidity Sensor 5 measurement of electrostatic collecting chamber 1, and according to temperature-humidity signal and default Temperature and humidity (the one article of humiture namely drawn in Standard Radon Chamber is to the fair curve of radon consistence), humiture correction is carried out to the count value of the α particle after iterated revision and the count value of the 2nd α particle by humiture correcting module 66, carry out the dry air entering electrostatic collection indoor without the need to drying agent thus;
Step S10, calculate according to the count value of the count value of the revised α particle of humiture and the 2nd α particle the concentration value obtaining radon and thoron by concentration calculation module 67, and export the concentration value of this radon and thoron to display system 7 for its storage and display.
In sum, the present invention has the following advantages:
1, present invention achieves can simultaneously and measure radon and thoron concentration continuously;
2, the present invention when measuring without the need to carrying out drying to the air extracted, thus the operating cost decreased when radon and thoron are measured and operation;
3, the radon in the present invention and thoron continuous measuring device structure are simple, maintenance cost and difficulty lower.
Above-described, be only preferred embodiment of the present invention, and be not used to limit scope of the present invention, the above embodiment of the present invention can also make a variety of changes.Namely every claims according to the present patent application and description are done simple, equivalence change and modify, and all fall into the claims of patent of the present invention.The not detailed description of the present invention be routine techniques content.
Claims (9)
1., based on radon and the thoron continuous measuring device of static collection, it is characterized in that, described device comprises:
Electrostatic collection room, it is communicated with an input pipe and an efferent duct;
To be arranged in described input pipe and near the daughter filtrator of its inlet end;
The aspiration pump be communicated with described efferent duct, the air containing mixing radon and thoron from electrostatic collection room described in described input pipe suction, produces to decay at the indoor collection radon of this electrostatic collection by it
218po particle and thoron decay produce
216po particle;
Be arranged on detector in described electrostatic collection chamber interior walls and relative with described input pipe, described in its detection
218po particle decay produce 6.00MeV a α particle and described in
216the 2nd α particle of the 6.78MeV that Po particle decay produces, and export corresponding detectable signal;
Be arranged on the Temperature Humidity Sensor of described electrostatic collection indoor, it is measured the humiture of described electrostatic collection indoor and exports corresponding temperature-humidity signal;
The signal and data processing system be connected with described detector and Temperature Humidity Sensor; And
The display system be connected with described Temperature Humidity Sensor and signal and data processing system;
Wherein, described signal and data processing system comprises:
Signal amplification module, it receives and amplifies described detectable signal;
The analog-to-digital conversion module be connected with described signal amplification module, it carries out analog to digital conversion to the described detectable signal after amplification and exports corresponding switching signal;
The particle counting module be connected with described analog-to-digital conversion module, it is screened a described α particle and the 2nd α particle according to described switching signal, and obtains the count value of a α particle and the count value of the 2nd α particle respectively;
With the overlap of peaks correcting module of described particle counting model calling, its count value of a α particle and count value of the 2nd α particle according to the overlap of peaks factor pair preset carry out overlap of peaks correction;
The iterated revision module be connected with described overlap of peaks correcting module, it adopts iterative amendment act and carries out iterated revision according to the revised count value of a described α particle of iterated revision factor pair overlap of peaks preset and the count value of the 2nd α particle;
With the humiture correcting module of described iterated revision model calling, it carries out humiture correction according to described temperature-humidity signal and default Temperature and humidity to the count value of a described α particle after iterated revision and the count value of the 2nd α particle; And
The concentration calculation module be connected with described humiture correcting module, it calculates according to the count value of the count value of the revised described α particle of humiture and the 2nd α particle the concentration value obtaining radon and thoron, and exports the concentration value of this radon and thoron to described display system for its storage and display.
2. the radon based on static collection according to claim 1 and thoron continuous measuring device, it is characterized in that, described display system comprises: the database be connected with described Temperature Humidity Sensor and concentration calculation module, respectively with the data disaply moudle of described DataBase combining, data inquiry module and data removing module, the touch display screen be connected with described data disaply moudle, data inquiry module and data removing module and the parameter setting module be connected with described touch display screen.
3. the radon based on static collection according to claim 1 and thoron continuous measuring device, it is characterized in that, described device also comprises the power module for powering to described electrostatic collection room, aspiration pump, detector, Temperature Humidity Sensor, signal and data handling system and display system.
4. the radon based on static collection according to claim 1 and thoron continuous measuring device, it is characterized in that, described aspiration pump is also communicated with a gas outlet.
5. the radon based on static collection according to claim 1 and thoron continuous measuring device, is characterized in that, described detector is ion implantation surface passivation detector.
6. the radon based on static collection according to claim 1 and thoron continuous measuring device, is characterized in that, containing glass fiber filter in described daughter filtrator.
7. the radon based on static collection according to claim 1 and thoron continuous measuring device, is characterized in that, described aspiration pump is the electromagnetic masking constant current aspiration pump of flow rate range at 3 ~ 6L/min.
8. the radon based on static collection according to claim 1 and thoron continuous measuring device, is characterized in that, chamber measured by the aluminium alloy of to be volume be in described electrostatic collection room 1.5L.
9., based on radon and the thoron method for continuous measuring of static collection, it is characterized in that, said method comprising the steps of:
Step S1, provides as the radon based on static collection in claim 1-8 as described in any one and thoron continuous measuring device;
Step S2, by described aspiration pump by electrostatic collection room described in the air suction containing mixing radon and thoron, adopts static collection to produce in the indoor collection radon decay of this electrostatic collection
218po particle and thoron decay produce
216po particle;
Step S3, is detected by described detector
218po particle decay produce 6.00MeV a α particle and
216the 2nd α particle of the 6.78MeV that Po particle decay produces, and export corresponding detectable signal;
Step S4, is amplified described detectable signal by described signal amplification module;
Step S5, is carried out analog to digital conversion by described analog-to-digital conversion module to the described detectable signal after amplification and exports corresponding switching signal;
Step S6, is screened a described α particle and the 2nd α particle according to described switching signal by described particle counting module, and obtains the count value of a α particle and the count value of the 2nd α particle respectively;
Step S7, carries out overlap of peaks correction by described overlap of peaks the correcting module count value of a α particle and count value of the 2nd α particle according to the overlap of peaks factor pair preset;
Step S8, adopts iterative amendment act by described iterated revision module and carries out iterated revision according to the revised count value of a described α particle of iterated revision factor pair overlap of peaks preset and the count value of the 2nd α particle;
Step S9, measure the humiture of described electrostatic collection indoor by described Temperature Humidity Sensor and export corresponding temperature-humidity signal, and according to described temperature-humidity signal and default Temperature and humidity, humiture correction being carried out to the count value of a described α particle after iterated revision and the count value of the 2nd α particle by described humiture correcting module; And
Step S10, calculate according to the count value of the count value of the revised described α particle of humiture and the 2nd α particle the concentration value obtaining radon and thoron by described concentration calculation module, and export the concentration value of this radon and thoron to described display system for its storage and display.
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