CN105116433A - Portable radon measuring instrument calibrator - Google Patents
Portable radon measuring instrument calibrator Download PDFInfo
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- CN105116433A CN105116433A CN201510616416.0A CN201510616416A CN105116433A CN 105116433 A CN105116433 A CN 105116433A CN 201510616416 A CN201510616416 A CN 201510616416A CN 105116433 A CN105116433 A CN 105116433A
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- radon
- case
- need
- solenoid valve
- calibrating device
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Abstract
The invention relates to a portable radon measuring instrument calibrator. The calibrator is mainly manufactured by light materials such as aluminium alloy, the whole device is in an integrated structure, the size of the whole device is less than 0.5 cubic meters, the total amount is less than 30 kilograms, and the carrying and the transportation during outside operation are facilitated. The portable radon measuring instrument calibrator includes a cabinet, a radon case, a stirring fan, a sampling hole, a solid radon source, a minisize air pump, a drying filter, a plurality of solenoid valves, a plurality of connecting pipelines, a control circuit board, an LCD display screen, a button, and a power supply module. The calibrator is set at three concentration points of 800Bq/m<3>, 1500Bq/m<3>, and 3000Bq/m<3>, the concentration is in opening circular type automatic stabilization control by a microprocessor without the need for an external radon concentration monitoring apparatus. The portable radon measuring instrument calibrator is small in size and light in weight, and is free of complex control devices such as a computer, the calibrator can be carried to a user's site and can be widely applied to the on-site calibration of fixedly installed radon measuring instruments used in the fields of earthquake forecasting and environment monitoring.
Description
Technical field
The present invention relates to emanometer calibrating device, belong to nuclear electronics instrument and ionising radiation metering technical field.The radon consistence expectation value that this device can need according to user, in a less confined space, (40 ~ 60 liters) automatically produce the steady concentration radon gas under this expectation value, measure for instrument for measuring radon to be calibrated, to complete calibration to emanometer or scale.Device is integrated, and machine volume is less than 0.5 cubic metre, and total amount is less than 30 kilograms, carries and transport when being convenient to go out operation, can be applicable to the field calibration of fixedly-mounted emanometer.
Background technology
Radon and short-lived daughter are all in radioactive equilibrium state under physical environment (particularly atmospheric environment), and thus scale instrument for measuring radon also requires that the radon that provides and short-lived daughter are in radioactive equilibrium.Usually, obtain a stable radon consistence, conventional method uranium ore or radon need is positioned in an airtight small container, and the radon natural diffuseness of uranium ore or radon need release out, is in radioactive equilibrium after three hours substantially, now can scaled instrument.But change radon consistence value, then need the amount increasing ore or radon need, automatic control cannot be realized.Realize the automatic control of radon consistence and stablize, just must design the stable radon need that accurately can control radon incidence, optimal mode adopts flow gas solid radon need.Miniature flow gas radon need in this calibrating device is made by radium-bearing (Rn-226) solid chemical compound, and radium wherein have passed through radioactive decay process below:
Suppose nucleic
226ra is the 0th nucleic, and the atomicity that the disintegration constant of this nucleic, arbitrarily t have and activity are designated as λ respectively
0, N
0(t) and Q
0(t); In like manner, from the 1st nucleic
222rn is to the 6th nucleic
210the atomicity that the disintegration constant of Po, arbitrarily t have and activity are designated as λ respectively
i, N
i(t) and Q
i(t) (i=1,2,3,4,5,6), and the 6th nucleic
210po belongs to long-lived daughter, and within the working time of calibrating device, the activity of this nucleic is negligible.Because major part surveys radon method, be all measure alpha ray, namely instrument for measuring radon counting is by the nucleic of the 1st in calibrating device radon case
222rn, the 2nd nucleic
218po and the 5th nucleic
214the alpha ray total activity Q of Po
1(t)+Q
2(t)+Q
5t () causes jointly.Therefore, while adjustment calibrating device radon consistence, the radioactive equilibrium of radon and short-lived daughter in calibrating device radon case must be considered.
When calibrating device brings into operation, first control circuit board sends signal and controls two groups of solenoid valves and radon need gas circuit be communicated with import and export two ends air, enter row's radon pattern that radon need discharges accumulation radon, micro air pump is started working 50 ~ 60 minutes, the radon of enrichment in radon need and daughter is discharged.Control two groups of solenoid valves afterwards radon need gas circuit to be switched to import and export with radon case and to be communicated with, form the closed cycle with radon case, enter and mend radon pattern, start to radon case input radon gas.The radon gas amount now produced in the radon need unit interval is steady state value.Radon consistence subsequently in radon case will rise with certain speed, and after arriving setting value, radon need gas circuit switches back air.Radon is due to factors such as the absorption of natural decay and tank material and casing leakages afterwards, and radon consistence starts to decline.Control circuit board starts interval by certain time interval and mends radon under the control of microprocessor program, and radon consistence is kept relative stability within the specific limits.
Summary of the invention
The invention provides one and can set three kinds of radon consistence values, and stable, the uniform emanometer calibrating device of radon consistence, and this device is integrated, volume is little, lightweight, easy to carry and transport, the calibrated scale that Radon and radon daughters surveying instrument is carried out at user scene can be got at, also can be used for the related experiment studying radon, radon daughter simultaneously.
Technical scheme of the present invention: a kind of portable emanometer calibrating device, this calibrating device comprises cabinet, radon case, agitation fan, thief hole, solid radon need, micro air pump, device for drying and filtering, solenoid valve, connecting line, control circuit board, LCD display, button and power module; Wherein radon case, agitation fan and thief hole are positioned at the top of cabinet; Solid radon need, micro air pump, device for drying and filtering, solenoid valve, control circuit board, LCD display, button and power module are positioned at the bottom of cabinet; This calibrating device inside adopts connecting line to be connected to radon case, solenoid valve, device for drying and filtering, solid radon need, micro air pump and solenoid valve successively, constitutes radon need gas circuit.Adopt connecting line to be connected to radon case, solenoid valve and micro air pump successively, constitute radon case row radon gas road; It is inner that agitation fan is installed on radon case; Radon case is provided with thief hole, is positioned at the center of radon case, is communicated with radon case, and thief hole is made up of 2 ~ 4 normally closed fast joints; Control circuit board, by all solenoid valves of connection and micro air pump, controls the opening and closing of each solenoid valve and micro air pump; LCD display is connected with control circuit board by data are existing with button, and is together installed on the bottom of cabinet with power module; The perforate of cabinet lower panel, exposes LCD display and button, convenient operation; Electric main is converted to direct current by power module, supply control circuit plate.
Radon case adopts airtight construction, and it is controlled radon need by circuit board and arranged radon gas road to switch that its inner radon consistence regulates, and adopts open loop type interval to mend automatic control and the adjustment that radon control algolithm realizes radon consistence.
By the blocked operation of solenoid valve, radon need gas circuit is mutually switched between row's radon pattern of the benefit radon pattern of radon case and radon need being discharged to accumulation radon; Be specially: when solenoid valve is opened, simultaneously during closed electromagnetic valve, for radon need mends radon pattern to radon case; Work as closed electromagnetic valve, when solenoid valve is opened, for radon need discharges the pattern of accumulation radon simultaneously.
Adopt external miniature flow gas solid radon need, activity is 5 ~ 20kBq; In radon case, radon consistence can be set as 800Bq/m
3, 1500Bq/m
3and 3000Bq/m
3three concentration point.
In radon case, the regulation and control algorithm of radon consistence is by the microprocessor programming realization on control circuit board; Button is used for carrying out setting operation to the radon consistence value of radon case, and LCD display is for showing the current radon consistence value of calibrating device and running state information.
Choice for use nitrogen carries out initial evacuation and postrun row's radon purge to radon case and solid radon need, can reduce radon case background values, improves radon consistence control accuracy further.
A kind of portable emanometer calibrating device, this calibrating device cabinet adopts the light materials such as aluminium alloy to be main processing, and be integrated, it is 40 ~ 60 liters that radon casing amasss, and machine volume is less than 0.5 cubic metre, and total amount is less than 30 kilograms, carries and transport when being convenient to go out operation.This calibrating device comprises cabinet, radon case, agitation fan, thief hole, solid radon need, micro air pump, device for drying and filtering, solenoid valve, connecting line, control circuit board, LCD display, button and power module.Wherein radon case, agitation fan and thief hole are positioned at the top of cabinet; Solid radon need, micro air pump, device for drying and filtering, solenoid valve, control circuit board, LCD display, button and power module are positioned at the bottom of cabinet.This calibrating device inside adopts connecting line to be connected to radon case, solenoid valve, device for drying and filtering, solid radon need, micro air pump and solenoid valve successively, constitutes radon need gas circuit.Adopt connecting line to be connected to radon case, solenoid valve, solenoid valve and micro air pump successively, constitute radon case row radon gas road; It is inner that agitation fan is installed on radon case, for being stirred by the radon gas in radon case; Radon case is provided with thief hole, is positioned at the center of radon case, is communicated with radon case, and thief hole is made up of 2 ~ 4 normally closed fast joints; Control circuit board, by all solenoid valves of connection and micro air pump, controls the opening and closing of each solenoid valve and micro air pump; LCD display and button are arranged on control circuit board, are connected with data line with between circuit board.The perforate of cabinet lower side, exposes LCD display and button, is convenient to operate calibrating device; Electric main is converted to direct current by power module, supply control circuit plate.
By the blocked operation of solenoid valve, radon need gas circuit is mutually switched between row's radon pattern of the benefit radon pattern of radon case and radon need being discharged to accumulation radon.Be specially: when solenoid valve 10 and 13 is opened, when solenoid valve 9 and 12 cuts out simultaneously, for radon need mends radon pattern to radon case; When solenoid valve 10 and 13 cuts out, when solenoid valve 9 and 12 is opened, for radon need discharges the pattern of accumulation radon simultaneously.
Adopt external miniature flow gas solid radon need, activity is 5 ~ 20kBq; In radon case, radon consistence can be set as 800Bq/m
3, 1500Bq/m
3and 3000Bq/m
3three concentration point.
In radon case, radon consistence controls and regulates algorithm to be by the microprocessor programming realization on control circuit board; Button is used for carrying out setting operation to the radon consistence value of radon case, and LCD display is for showing the current radon consistence value of calibrating device and running state information.
Use nitrogen to carry out initial evacuation and postrun row's radon purge to radon case and solid radon need, radon case background values can be reduced, improve radon consistence control accuracy further.
Radon case adopts airtight construction, and it is controlled radon need by circuit board and arranged radon gas road to switch that its inner radon consistence regulates, and adopts open loop type interval to mend automatic control and the adjustment that radon control algolithm realizes radon consistence.Therefore outside radon consistence monitoring instrument is not needed.Adopt external miniature flow gas solid radon need, activity is 5 ~ 20kBq; In radon case, radon consistence can be set as 800Bq/m
3, 1500Bq/m
3and 3000Bq/m
3three concentration point.Radon consistence regulation and control algorithm is by the microprocessor programming realization on control circuit board 16; Button is used for carrying out setting operation to radon case radon consistence value, and LCD display is for showing the information such as the current radon consistence value of calibrating device and running status.For improving radon consistence control accuracy further, before calibrating device carries out benefit radon, nitrogen can be used to replace room atmosphere initially to arrange radon to radon case and radon need, and postrun row's radon purge, to reduce the radon background in radon case, improve radon consistence control accuracy further.
Advantage of the present invention: radon consistence adopts microprocessor to realize open loop type autostable and controls, without the need to external radon consistence monitoring instrument.This calibrating device volume is little, lightweight, without the need to complex control devices such as computing machines, calibrating device can be carried into user scene, is widely used in the field calibration of the fixedly-mounted emanometer that the fields such as earthquake prediction, environmental monitoring use.
Accompanying drawing illustrates:
Fig. 1 is a kind of portable emanometer calibrating device structural representation of the present invention;
Fig. 2 is that a kind of portable emanometer calibrating device of the present invention implements outside drawing;
Fig. 3 is a kind of portable emanometer calibrating device example radon consistence control flow chart of the present invention;
Fig. 4 is a kind of portable emanometer calibrating device example test data curve map of the present invention.
In figure: 1, casing; 2, radon case; 3, agitation fan; 4, thief hole; 5, solid radon need; 6, micro air pump 1; 7, micro air pump 2; 8, device for drying and filtering; 9 ~ 14, solenoid valve 1 ~ 6; 15, connecting line; 16, control circuit board; 17, LCD display; 18, button; 19, power module.
Embodiment
Following case study on implementation for illustration of the present invention, but is not used for limiting the scope of the invention.
The implementation case devises a complete portable emanometer calibrating device.This calibrating device cabinet appearance profile is a box-shaped being about 54 (height) × 42 (wide) × 42 (thick) cm.Radon case is positioned at calibrating device top, and inner cavity size is about 44 (height) × 38 (wide) × 38 (thick) cm, and volume is about 63.5 liters.Radon case is airtight construction, guarantees radon case and extraneous No leakage.Calibrating device cabinet bottom is that drawer type controls cabinet, and cabinet includes the parts such as solid radon need, device for drying and filtering, solenoid valve, micro air pump, control circuit board, power module.It is inner that agitation fan is installed on radon case, for being stirred by radon gas in radon case; Thief hole is communicated with radon case, is made up of 4 normally closed fast joints, for being taken out radon gas by test examination instrument from radon case, and after measurement completes, sends radon case back to, forms airtight gas circuit circulation; Control circuit board is arranged on drawer type and controls cabinet panel back, by all solenoid valves of connection and micro air pump, controls the opening and closing of each solenoid valve and micro air pump; LCD display, button and power switch are installed on control circuit board top, and expose at cabinet panel uplifting window and punching, and personnel easy to use arrange calibrating device and operate; Electric main is converted to direct current by power module, supply control circuit plate.This calibrating device example as shown in Figure 2.
In control cabinet, adopt connecting line to be connected to radon case, solenoid valve, device for drying and filtering, solid radon need, micro air pump etc. successively, constitute radon need gas circuit, can benefit radon be carried out to radon case or carry out emptying to solid radon need; Adopt connecting line to be connected to radon case, solenoid valve and micro air pump successively, constitute radon case row radon gas road, the radon gas in radon case can be discharged after end of run.
This calibrating device case technology index is as follows:
A. radon case volume: 63.5L;
B. radon consistence range of control: 800Bq/m
3, 1500Bq/m
3and 3000Bq/m
3three concentration point;
C. radon consistence accuracy :≤10%;
D. radon consistence stability: ± 3% ~ ± 10%;
E. radon case leak rate :≤0.5%.
This calibrating device example is mending the link of radon to radon case, employing be the mode that batch (-type) mends radon.Calibrating device has three optional radon consistence, is 800Bq/m
3, 1500Bq/m
3, 3000Bq/m
3three kinds of concentration values.Each concentration point is identical flow process to the calibration operation of emanometer.With 800Bq/m
3for example, before benefit radon starts, with standard emanometer, the radon consistence background values of arranging in the radon case of radon is measured, average as the radon concentration of radon case after measuring 10 values, just can open calibrating device afterwards and run.Open calibrating device power switch, select concentration point 800Bq/m by button
3, then input the radon concentration just now recorded, start to mend radon by after confirmation.If adopt nitrogen to replace room atmosphere to carry out the operation of row's radon to radon case before, then can skip sample-out count operation.
The flow process of mending radon is divided into three steps.The first step is that solid radon need is emptying, to get rid of radon need accumulation radon gas.Now the solenoid valve of solid radon need two ends connection air and air pump can be opened by control circuit board, are discharged by the radon of accumulation before in radon need.Must do this step is because solid radon need continuous accumulation radon of meeting in airtight situation, the radon of accumulation is drained the accuracy ensureing follow-up benefit radon.Second step is then continue to carry out benefit radon to radon case, and the solenoid valve that radon need two ends are connected with radon case is opened (simultaneously another two closed electromagnetic valves be connected with air), and carry out benefit radon to radon case, after certain time, in radon case, radon consistence reaches 800Bq/m
3.3rd step is then that interval mends radon process, stops mending radon according to calculated with mathematical model when radon consistence reaches error higher limit, and gas circuit is switched to row's radon need accumulation radon pattern.And when radon case radon consistence reaches error floor value, be then again converted to the radon pattern of mending, when the 3rd step run reach 3 hours T.T. after, then in radon case, radon consistence reaches steady state (SS) in a basic balance, after this just can calibrate emanometer.Reach higher radon consistence value and then complete next complete benefit radon flow process in the direct basis from low concentration.This calibrating device example radon consistence control flow as shown in Figure 3.
This calibrating device example has carried out the experimental test of all technical in the completed.For radon consistence accuracy test in radon case, this test is from 19:40 to 8:30 next day, and use standard emanometer concentration value in monitoring in a 20 minutes radon case, radon consistence target is 1500Bq/m
3test data curve under pattern as shown in Figure 4.
This test data shows, at aimed concn 1500Bq/m
3under pattern, in radon case, average radon concentration is 1533.3Bq/m
3(mean concentration get time be second day 7:40 ~ 8:30).Error amount U2=(average-C standard of C)/C standard, can obtain 1500Bq/m
3under pattern, error is U2=2.2%.
Claims (6)
1. a portable emanometer calibrating device, is characterized in that: this calibrating device comprises cabinet (1), radon case (2), agitation fan (3), thief hole (4), solid radon need (5), micro air pump (6,7), device for drying and filtering (8), solenoid valve (9 ~ 14), connecting line (15), control circuit board (16), LCD display (17), button (18) and power module (19); Wherein radon case (2), agitation fan (3) and thief hole position (4) are in the top of cabinet (1); Solid radon need (5), micro air pump (6,7), device for drying and filtering (8), solenoid valve (9 ~ 14), control circuit board (16), LCD display (17), button (18) and power module (19) are positioned at the bottom of cabinet (1); This calibrating device inside adopts connecting line (15) to be connected to radon case (2), solenoid valve (9,10), device for drying and filtering (8), solid radon need (5), micro air pump (6) and solenoid valve (12,13) successively, constitutes radon need gas circuit; Adopt connecting line (15) to be connected to radon case (2), solenoid valve (11,14) and micro air pump (7) successively, constitute radon case (2) row radon gas road; It is inner that agitation fan (3) is installed on radon case (2); Radon case (2) is provided with thief hole (4), is positioned at the center of radon case (2), is communicated with radon case (2), and thief hole (4) is made up of 2 ~ 4 normally closed fast joints; Control circuit board (16), by all solenoid valves of connection and micro air pump, controls the opening and closing of each solenoid valve and micro air pump; LCD display (17) is connected with control circuit board (16) by data are existing with button (18), and is together installed on the bottom of cabinet (1) with power module (19); Cabinet (1) lower panel perforate, exposes LCD display (17) and button (18), convenient operation; Electric main is converted to direct current by power module (19), supply control circuit plate (16).
2. portable emanometer calibrating device according to claim 1, it is characterized in that: radon case (2) adopts airtight construction, it is controlled radon need by circuit board (16) and arranged radon gas road to switch that its inner radon consistence regulates, and adopts open loop type interval to mend automatic control and the adjustment that radon control algolithm realizes radon consistence.
3. portable emanometer calibrating device according to claim 1, it is characterized in that: by the blocked operation of solenoid valve (9,10,12,13), radon need gas circuit is mutually switched between row's radon pattern of the benefit radon pattern of radon case and radon need being discharged to accumulation radon; Be specially: when solenoid valve (10,13) is opened, when solenoid valve (9,12) cuts out simultaneously, for radon need mends radon pattern to radon case; When solenoid valve (10,13) cuts out, when solenoid valve (9,12) is opened, for radon need discharges the pattern of accumulation radon simultaneously.
4. portable emanometer calibrating device according to claim 1, is characterized in that: adopt external miniature flow gas solid radon need (5), activity is 5 ~ 20kBq; In radon case, radon consistence can be set as 800Bq/m
3, 1500Bq/m
3and 3000Bq/m
3three concentration point.
5. portable emanometer calibrating device according to claim 1, is characterized in that: the regulation and control algorithm of radon case (2) interior radon consistence is by the microprocessor programming realization on control circuit board (16); Button (18) is for carrying out setting operation to the radon consistence value of radon case (2), and LCD display (17) is for showing the current radon consistence value of calibrating device and running state information.
6. portable emanometer calibrating device according to claim 1, it is characterized in that: choice for use nitrogen carries out initial evacuation and postrun row's radon purge to radon case (2) and solid radon need (5), radon case background values can be reduced, improve radon consistence control accuracy further.
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|---|---|---|---|
| CN201510616416.0A CN105116433A (en) | 2015-09-24 | 2015-09-24 | Portable radon measuring instrument calibrator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510616416.0A CN105116433A (en) | 2015-09-24 | 2015-09-24 | Portable radon measuring instrument calibrator |
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Family
ID=54664465
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| CN201510616416.0A Pending CN105116433A (en) | 2015-09-24 | 2015-09-24 | Portable radon measuring instrument calibrator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108827859A (en) * | 2018-09-11 | 2018-11-16 | 东华理工大学 | A kind of radon gas diffusion type rock effecive porosity measuring device and method |
| CN109557009A (en) * | 2019-01-22 | 2019-04-02 | 深圳市无眼界科技有限公司 | A kind of wide range particulate matter detection means |
| CN113376683A (en) * | 2021-06-21 | 2021-09-10 | 云南省地震局信息中心 | Method for calibrating DDL-1 type gas radon meter by using AlphaGUARD P2000F radon meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108827859A (en) * | 2018-09-11 | 2018-11-16 | 东华理工大学 | A kind of radon gas diffusion type rock effecive porosity measuring device and method |
| CN108827859B (en) * | 2018-09-11 | 2024-04-02 | 东华理工大学 | Radon gas diffusion type rock effective porosity measuring device and method |
| CN109557009A (en) * | 2019-01-22 | 2019-04-02 | 深圳市无眼界科技有限公司 | A kind of wide range particulate matter detection means |
| CN109557009B (en) * | 2019-01-22 | 2024-03-29 | 深圳市无眼界科技有限公司 | Wide-range particulate matter detection device |
| CN113376683A (en) * | 2021-06-21 | 2021-09-10 | 云南省地震局信息中心 | Method for calibrating DDL-1 type gas radon meter by using AlphaGUARD P2000F radon meter |
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Application publication date: 20151202 |