CN105068569A - Radon concentration control method used for portable radon meter calibrator - Google Patents

Radon concentration control method used for portable radon meter calibrator Download PDF

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CN105068569A
CN105068569A CN201510612829.1A CN201510612829A CN105068569A CN 105068569 A CN105068569 A CN 105068569A CN 201510612829 A CN201510612829 A CN 201510612829A CN 105068569 A CN105068569 A CN 105068569A
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radon
consistence
generator
solid
calibrating device
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CN105068569B (en
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瞿金辉
张雄杰
王仁波
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East China Institute of Technology
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Abstract

The invention relates to a radon concentration control method used for a portable radon meter calibrator. A method of combining gas flow continuous radon supplement and closed circulation accumulation-type radon concentration control is utilized. Firstly, under the gas flow continuous radon supplement mode, high-purity nitrogen is used to eliminate influences of the background value of radon in inlet air of a solid radon generator on the final radon concentration control precision of the radon meter calibrator in the previous radon meter calibrator control method. The advantages of rapidity and stability of a closed circulation accumulation-type radon concentration control scheme are utilized. After a stable radon concentration point is obtained in the gas flow mode, the gas flow is switched to a closed circulation accumulation-type radon concentration control mode. The invention discloses the radon concentration control implementation mode and a parameter calculation method in the whole control flow. Therefore, the method provided by the invention solves the problem that initial environment parameters cannot be set conveniently in the radon concentration of a portable radon meter calibrator, no external radon monitor is required, and a stable radon concentration point required for calibrating a radon meter can be rapidly obtained.

Description

A kind of radon consistence control method for portable emanometer calibrating device
Technical field
The invention belongs to Radiation Dose & Protection field, relate to a kind of radon consistence control method for portable emanometer calibrating device.The method does not need to arrange any and environmental correclation initial concentration parameter, does not adopt external monitoring instrument and Absorbable organic halogens to obtain radon measurement instrument calibration required with stablizing radon consistence point.
Background technology
Portable instrument for measuring radon calibrating device is should some sector application demands and a kind of machine volume of designing is less than 0.5 cubic metre, it is 40 ~ 60L that radon case amasss, total amount is less than 30 kilograms, carry when being convenient to go out operation and transport, do not increase extra radon consistence monitoring instrument simultaneously, do not arrange the radon consistence initial parameter of environmental correclation, can stablize radon concentration point needed for quick obtaining calibration instrument, the scene being applicable to fixedly-mounted emanometer is quickly calibrated.The international and domestic control method used for instrument for measuring radon calibrating device mainly comprises at present: 1) static cost control, after the solid radon generator of different activity is left standstill emanometer calibrating device a period of time, emanometer calibrating device inside reaches radon consistence balance thus obtains calibration radon consistence point; 2) circulative accumulation formula, closes circulation gas circuit and makes solid radon generator airtight, opens circulation gas circuit, supplement radon gas by air pump is continual with fixed flow rate to radon case when the inner radon consistence of solid radon generator is accumulated to a certain degree; 3) airtight accumulating, first solid radon generator arranges radon, and the circulation gas circuit then between solid radon generator and radon case is opened, and realizes mending radon → Natural Attenuation → midway first and mends the process that radon → Natural Attenuation →... is mended in radon → Natural Attenuation → midway; 4) the discrete control method of gas, solid radon generator provides radon gas to enter radon case, and radon case provides gas circuit to lead to the external world simultaneously, forms the circulation communicated with air, discharged by internal gas, then set time, fixing suction performance are mended radon and obtain scale radon consistence.
Said method maybe needs to arrange radon consistence initial parameter (as method 1,2,3) or mend radon speed too slow (as method 4) or automatically cannot control radon consistence (as method 1,2) etc., cannot meet the requirement (in needs extra radon case, radon consistence monitoring instrument, not needs do not input any environmental correclation radon consistence initial parameter etc.) of portable emanometer calibrating device radon consistence control, can reach radon consistence point needed for instrument calibration fast.
Summary of the invention
The invention provides a kind of radon consistence control method for emanometer calibrating device, the radon consistence point that instrument for measuring radon calibration is required stable can be set up fast, and do not need radon consistence monitoring instrument in extra radon case, do not need to input any environmental correclation radon consistence initial parameter etc., be adapted to the automatic control of portable survey radon calibrating device radon consistence.
The present invention realizes by following technical solution, a kind of radon consistence control method for portable emanometer calibrating device, the stable radon consistence needed for instrument for measuring radon calibration can be set up fast, and do not need external radon case radon consistence monitoring instrument, do not need input radon case radon consistence initial parameter, be applicable to the automatic control of portable survey radon calibrating device radon consistence, the method is realized by following control method, comprises step:
1. set up control gas circuit make solid radon generator inlet, outlet all connect air, the row of opening radon pump drain solid radon generator accumulation radon, arrange the radon time be greater than 30 minutes;
2. flow gas mends radon control continuously: set up the outer circulation gas circuit that nitrogen → solid radon generator → radon case → air communicates, by the airshed of the control inputs nitrogen of formula (1) continous-stable, solid radon generator, calibrating device radon case and air, formula (2) controls flow gas and mends the radon time continuously, thus fast in calibrating device radon case, to set up a radon consistence be C stable point.
Q = S C - 2.1 × 10 - 6 V - - - ( 1 )
t > 5 ( ln ( 2 ) / T + 2.1 × 10 - 6 + Q / V ) - - - ( 2 )
3. airtight accumulating radon consistence stability contorting: when being mended after radon mode makes radon case radon consistence reach a preset concentration point continuously by flow gas, the radon gas that solid radon generator produces at any time discharged by the row's of utilization radon pump, and row's radon time is controlled by formula (3).Open the sealing and circulating gas circuit (namely solid radon generator, calibrating device radon case form Inner eycle) between solid radon generator and calibrating device radon case subsequently, opening time is controlled by formula (4), the radon consistence higher limit making radon consistence again rise to design to allow, the process of radon mended by repetition solid radon generator row radon like this, solid radon generator to emanometer calibrating device radon case, emanometer calibrating device can be made to maintain in allowed error range and stablize radon consistence point, namely instrument for measuring radon can be calibrated in this concentration point.
t 0 = 1 2.1 × 10 - 6 + l n ( 2 ) / T ln ( 1 + 2 ϵ 1 - ϵ ) - - - ( 3 )
t 1 = 1 l n ( 2 ) / T + 2.1 × 10 - 6 l n ( 2.1 × 10 - 6 + ln ( 2 ) / T ) ( 1 - ϵ ) C V - S ( 2.1 × 10 - 6 + ln ( 2 ) / T ) ( 1 + ϵ ) C V - S - - - ( 4 )
4. airtight accumulating mends radon: after instrument for measuring radon completes a radon consistence point calibration, needs adjustment radon consistence to next some C n, open the sealing and circulating gas circuit between solid radon generator and emanometer calibrating device radon case, the opening time is controlled by formula (5), can obtain radon consistence C in current emanometer calibrating device radon case n, then perform flow process 3., stablize the concentration point of current radon in emanometer calibrating device casing.4. circulation performs flow process can obtain the calibration for instrument for measuring radon of the different radon consistence points that increase gradually.
t 2 = 1 2.1 × 10 - 6 + ln ( 2 ) / T l n ( 2.1 × 10 - 6 + ln ( 2 ) / T ) C V - S ( 2.1 × 10 - 6 + ln ( 2 ) / T ) ( 1 + ϵ ) C n V - S - - - ( 5 )
In above-mentioned formula, ε: radon consistence departure; T: radon casing makes radon consistence in casing reduce to the time (s) of initial radon consistence half because absorption and body leak; C: control radon consistence (Bq/m 3) point; C n: next radon consistence point (Bq/m3); V: emanometer calibrating device volume (L); S: solid radon generator incidence (Bq/s); Q: gas flow (m 3/ s); t,t 0, t 1, t 2: solid radon generator time control parameter (opening and closing the time of solid radon generator).
Flow gas is mended continuously in radon and is adopted nitrogen through nitrogen buffer zone as the air inlet of radon case, using eliminate adopt air to exist as air inlet Radon background values on the impact of control accuracy, and then radon consistence initial parameter can not be set set up a stable radon consistence point.
A kind of portable emanometer calibrating device control method, controling parameters Q and t needed for it, t 0, t 1, t 2all by the algorithm Obtaining Accurate described by formula (1) ~ (5), therefore this control procedure is a ring opening process, can not rely on the value of feedback of external radon consistence monitoring instrument completely.
The invention has the advantages that: this method solve portable emanometer calibrating device radon consistence and control the problem that inconvenience arranges initial environment parameter, and do not need outside Radon monitor instrument, reach the stable radon consistence point needed for calibration emanometer device fast.
Accompanying drawing illustrates:
Fig. 1 gas circuit of the present invention connects, controls schematic diagram;
Fig. 2 radon consistence control flow chart of the present invention;
Fig. 3 the present invention radon consistence on portable instrument for measuring radon calibrating device controls instance graph.
In figure: 1, nitrogen storer; 2, nitrogen buffer zone; 3, flowmeter; 4 ~ 11, electrovalve; 12, radon pump is arranged; 13, blower fan; 14, flow control pump; 15, solid radon generator; 16, radon case; 17, MCU central control system.
Embodiment:
Below by the drawings and specific embodiments, the present invention is described in more detail.By to the volume of a new production being the portable emanometer calibrating device of 60L, scheme according to this invention, the control structure figure devised as shown in Figure 1 carries out the control of radon concentration, arranging radon consistence departure in radon case 16 is 5 ‰, and it is 3.7 × 10 that test in early stage obtains the slip of radon case 16 -6bq, radon concentration control flow is following as Fig. 2, and concrete steps are:
1. open electronics 4 and 11 simultaneously, close electrovalve 5 ~ 10, open flow control pump 14, get rid of the radon gas constantly produced in 15 solid radon generators, this process operation 40 minutes.
2. open electrovalve (5,7,9) simultaneously, close electrovalve (4,6,8,10,11), utilize nitrogen in 1 nitrogen storer through 2 nitrogen buffer zones, flow control pump 14 flow set is 1.575L, flowmeter 3 is adopted to monitor the flow of solid flow control pump 14, the radon produced in solid radon generator is blown into 16 radon casees (incidence of solid radon generator is 1.26Bq/min), this process operation 3.16 hours, obtains 800Bq/m 3radon consistence point.
3. close electrovalve 5 ~ 10 simultaneously, open electrovalve (4,11), open blower fan 13 to make in 16 radon casees radon consistence evenly, to open in controllable flow rate pump 14 (controllable flow rate pump 14 flow set is 1L/min), row's solid radon generator 15 radon gas 1.12 hours; Close electrovalve (4,5,7,8,10,11) after within 1.12 hours, completing simultaneously, open electrovalve (6,9), controllable flow rate pump 14 continues to run with 1L/min flow, solid radon generator 15 mends radon in radon case 16, this process operation 23 seconds.
4. 3. circulation performs flow process, makes radon concentration be stabilized in 800Bq/m 3, stablize this radon consistence 3 hours.
5. when control radon concentration is from 800Bq/m 3reach 1500Bq/m 3time, close electrovalve (4,5,7,8,10,11) simultaneously, open electrovalve (6,9), controllable flow rate pump 14 runs with 1L/min flow, solid radon generator 15 mends radon in radon case 16, blower fan 13 is opened to make even concentration in radon case, this process operation 34.2 minutes.
6. 3. circulation performs flow process, and other controling parameters and control procedure remain unchanged; It is 43.4 seconds that change solid radon generator 15 mends the radon time in radon case 16, stablizes this radon consistence 3 hours.
7. when control radon concentration is from 1500Bq/m 3reach 3000Bq/m 3time, close electrovalve (4,5,7,8,10,11) simultaneously, open electrovalve (6,9), controllable flow rate pump 14 runs with 1L/min flow, solid radon generator 15 mends radon in radon case 16, blower fan 13 is opened to make even concentration in radon case, this process operation 73.56 minutes.
8. 3. circulation performs flow process, and other controling parameters and control procedure remain unchanged; It is 88.0 seconds that change solid radon generator 15 mends the radon time in radon case 16, stablizes this radon consistence 3 hours.
Process 1. ~ 8. all adopt MCU central control system 17 to control, all control algolithms are realized by software programming in MCU.
Accompanying drawing 3 is the results utilizing method described in way of example of the present invention to control portable survey radon calibrating device radon consistence.

Claims (3)

1. for a radon consistence control method for portable emanometer calibrating device, its step:
1. set up control gas circuit make solid radon generator inlet, outlet all connect air, the row of opening radon pump drain solid radon generator accumulation radon, arrange the radon time be greater than 30 minutes;
2. flow gas mends radon control continuously: set up the outer circulation gas circuit that nitrogen → solid radon generator → radon case → air communicates, by the airshed of the control inputs nitrogen of formula (1) continous-stable, solid radon generator, calibrating device radon case and air, formula (2) controls flow gas and mends the radon time continuously, thus fast in calibrating device radon case, to set up a radon consistence be C stable point;
Q = S C - 2.1 × 10 - 6 V - - - ( 1 )
t > 5 ( ln ( 2 ) / T + 2.1 × 10 - 6 + Q / V ) - - - ( 2 )
3. airtight accumulating radon consistence stability contorting: when being mended after radon mode makes radon case radon consistence reach a preset concentration point continuously by flow gas, the radon gas that solid radon generator produces at any time discharged by the row's of utilization radon pump, and row's radon time is controlled by formula (3); Open the sealing and circulating gas circuit between solid radon generator and calibrating device radon case subsequently, opening time is controlled by formula (4), the radon consistence higher limit making radon consistence again rise to design to allow, the process of radon mended by repetition solid radon generator row radon like this, solid radon generator to emanometer calibrating device radon case, emanometer calibrating device can be made to maintain in allowed error range and stablize radon consistence point, namely instrument for measuring radon can be calibrated in this concentration point;
t 0 = 1 2.1 × 10 - 6 + ln ( 2 ) / T l n ( 1 + 2 ϵ 1 - ϵ ) - - - ( 3 )
t 1 = 1 ln ( 2 ) / T + 2.1 × 10 - 6 ln ( 2.1 × 10 - 6 + ln ( 2 ) / T ) ( 1 - ϵ ) C V - S ( 2.1 × 10 - 6 + ln ( 2 ) / T ) ( 1 + ϵ ) C V - S - - - ( 4 )
4. airtight accumulating mends radon: after instrument for measuring radon completes a radon consistence point calibration, needs adjustment radon consistence to next some C n, open the sealing and circulating gas circuit between solid radon generator and emanometer calibrating device radon case, the opening time is controlled by formula (5), can obtain radon consistence C in current emanometer calibrating device radon case n, then perform flow process 3., stablize the concentration point of current radon in emanometer calibrating device casing; 4. circulation performs flow process can obtain the calibration for instrument for measuring radon of the different radon consistence points that increase gradually;
t 2 = 1 2.1 × 10 - 6 + ln 2 / T ln ( 2.1 × 10 - 6 + ln ( 2 ) / T ) C V - S ( 2.1 × 10 - 6 + ln ( 2 ) / T ) ( 1 + ϵ ) C n V - S - - - ( 5 )
In above-mentioned formula, ε: radon consistence departure; λ 1: radon absorption and the slip of radon case own; C: control radon consistence point; C n: next radon consistence point; V: emanometer calibrating device volume; S: solid radon generator incidence; Q: gas flow; t,t 0, t 1, t 2: solid radon generator time control parameter.
2. according to claim 1 for the radon consistence control method of portable emanometer calibrating device, it is characterized in that: flow gas is mended continuously in radon and adopted nitrogen through nitrogen buffer zone as the air inlet of radon case, using eliminate adopt air to exist as air inlet Radon background values on the impact of control accuracy, and then radon consistence initial parameter can not be set set up a stable radon consistence point.
3. according to claim 1 for the radon consistence control method of portable emanometer calibrating device, it is characterized in that: controling parameters Q and t needed for it, t 0, t 1, t 2all by the algorithm Obtaining Accurate described by formula (1) ~ (5), therefore this control procedure is a ring opening process, can not rely on the value of feedback of external radon consistence monitoring instrument completely;
Wherein ε: radon consistence departure; T: radon casing makes radon consistence in casing reduce to the time of initial radon consistence half because absorption and body leak; C: control radon consistence point; C n: next radon consistence point; V: emanometer calibrating device volume; S: solid radon generator incidence; Q: gas flow; t,t 0, t 1, t 2: solid radon generator time control parameter.
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CN106569253A (en) * 2016-10-28 2017-04-19 核工业北京地质研究院 Method for finely calibrating gamma total amount measurement type activated carbon radon measurement instrument
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CN113466916A (en) * 2021-06-21 2021-10-01 云南省地震局信息中心 Method for calibrating radon measuring instrument by using radon dissolved in water

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CN106569253A (en) * 2016-10-28 2017-04-19 核工业北京地质研究院 Method for finely calibrating gamma total amount measurement type activated carbon radon measurement instrument
CN106569252A (en) * 2016-10-28 2017-04-19 核工业北京地质研究院 Method of correcting consistency of gamma total amount measurement type active carbon emanometer
CN106569253B (en) * 2016-10-28 2019-04-16 核工业北京地质研究院 A kind of method of the total measurement type Activated Carbon Instrument for testing Radon of fine adjustment gamma
CN107607985A (en) * 2017-09-20 2018-01-19 南华大学 The apparatus and method for regulating and controlling radon daughter state parameter can be stablized
CN107607985B (en) * 2017-09-20 2019-05-14 南华大学 The apparatus and method of regulation radon daughter state parameter can be stablized
CN108646286A (en) * 2018-06-01 2018-10-12 衡阳师范学院 A kind of reference unit and method of continuous reliable regulation and control precipitation rate of radon
CN113466916A (en) * 2021-06-21 2021-10-01 云南省地震局信息中心 Method for calibrating radon measuring instrument by using radon dissolved in water

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