CN101738628A - Method for ensuring counting and measuring stability in long-life alpha aerosol monitoring - Google Patents
Method for ensuring counting and measuring stability in long-life alpha aerosol monitoring Download PDFInfo
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- CN101738628A CN101738628A CN200810226959A CN200810226959A CN101738628A CN 101738628 A CN101738628 A CN 101738628A CN 200810226959 A CN200810226959 A CN 200810226959A CN 200810226959 A CN200810226959 A CN 200810226959A CN 101738628 A CN101738628 A CN 101738628A
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Abstract
The invention belongs to monitoring technology of radioactive aerosol, in particular to a method for ensuring the counting and measuring stability in the long-life alpha aerosol monitoring. The method is realized as follows: the pulse multiplying power is adjusted by using the peak position of a radon-thorium daughter alpha-spectrum obtained by sampling and monitoring in the air as a basic mark for recognizing whether the electronic performance changes or not according to the peak position change of the radon-thorium daughter alpha-spectrum; and the peak position of the radon-thorium daughter alpha-spectrum is stabilized at a setting position of a multi-channel analyzer, thereby ensuring the highest stability of the set counting area. Since the set counting area keeps the highest stability, the invention ensures the highest stability and the stability of the life-service alpha counting measurement on nuclides of aranium and plutonium.
Description
Technical field
The invention belongs to the radioaerosol monitoring technology, be specifically related to the method that ensures counting and measuring stability in a kind of long-life alpha aerosol monitoring.
Background technology
In the nuclear facilities of long-life αHe Sus such as operation uranium, plutonium, usually all to use the method for air sampling and the measurement of α radiation counter, the long-life alpha aerosols that αHe Su produced such as uranium, plutonium are effectively monitored, to determine in the air pollution concentration by the formed long-life alpha aerosol of this class radioactivity αHe Su.To effectively monitor long-life alpha aerosol, its maximum difficult point is to eliminate the influence of radon in the air (and Th) daughter αHe Su, for this reason, in long-life alpha aerosol monitoring method or monitoring instrument, usually utilize the different of long-life alpha nucleic and radon (and Th) daughter αHe Su energy, adopt α energy discrimination method, the α that long-life alpha is counted and radon (and Th) daughter nuclide produces that uranium, plutonium nucleic are produced counts, different count blocks is set distinguishes count measurement, can eliminate the influence of radon (and Th) daughter αHe Su in principle.But the prerequisite of α energy discrimination method is, guarantees the maximum stable of electronics performance (for example pulse enlargement factor), makes set count block keep maximum stable, and this generally is difficult to accomplish.For solving this difficult problem, usually adopt in the world at present and pass through long-run test, determine the compensating factor that can represent its unstable performance feature, characterize the instability of a whole set of monitor with this compensating factor, and the error of bringing to monitoring result that causes therefrom of estimation.But even if rationally determined this compensating factor, this compensating factor also is difficult to permanently effective, particularly can not guarantee under the situation of maximum stable especially true in electronics performance (as the pulse enlargement factor).
Summary of the invention
The objective of the invention is defective, the method that ensures counting and measuring stability in a kind of long-life alpha aerosol monitoring is provided, to realize the dynamic and steady in a long-term of electronics performance at prior art.
Technical scheme of the present invention is as follows: the method that ensures counting and measuring stability in a kind of long-life alpha aerosol monitoring, this method is utilized the peak position of resulting radon thorium daughter α spectrum in the air sampling monitoring, as discerning the basic sign whether the electronics performance changes, change according to the peak position of radon thorium daughter α spectrum and to come the regulating impulse enlargement factor, the peak position of radon thorium daughter α spectrum is stabilized in a desired location of multichannel analyzer, thereby has guaranteed the maximum stable of set count block.
Further, the method that ensures counting and measuring stability in the aforesaid long-life alpha aerosol monitoring, wherein, the daughter of described radon thorium is RaC ' or ThC '.
Further, the method that ensures counting and measuring stability in the aforesaid long-life alpha aerosol monitoring, wherein, changing the method for coming the regulating impulse enlargement factor according to the peak position of radon thorium daughter α spectrum is: when the peak position of the α of radon thorium daughter spectrum when low side drifts about, start the linear resistance of regulating enlargement factor, make it to improve the pulse enlargement factor; When the peak position of the α of radon thorium daughter spectrum during to high-end drift, start the linear resistance of regulating enlargement factor, make it to reduce the pulse enlargement factor.
Further, the method that ensures counting and measuring stability in the aforesaid long-life alpha aerosol monitoring, wherein, the desired location of described multichannel analyzer is 800 roads.
Beneficial effect of the present invention is as follows: utilization of the present invention certainly exists in the air sampling monitoring, and the peak position of the radon thorium daughter α that monitors easily spectrum, as discerning the basic sign whether electronics performance (pulse enlargement factor) changes, method by pulse enlargement factor dynamic adjustable, the peak position of the α of radon thorium daughter spectrum is stabilized in a certain position of multichannel analyzer, can realize the maximum stable of electronics performance (pulse enlargement factor), thereby guarantee that set count block keeps maximum stable, because set count block keeps maximum stable, has also promptly guaranteed uranium, the maximum stable of the long-life alpha count measurement that the plutonium nucleic produces is with reliable.
Embodiment
Below in conjunction with specific embodiment the present invention is described in detail.
This root problem of maximum stable of collateral security electronics performance of the present invention (pulse enlargement factor) is started with, and keeps maximum stable to realize set count block.But whether electronics performance (pulse enlargement factor) changes, and 1～2 specific indexes must be arranged as reference.In the present invention, whether the stablizing of electronics performance (pulse enlargement factor), the peak position of the α spectrum by monitoring radon thorium daughter (RaC ' or ThC ') realizes.Because pulse height is directly proportional with the energy of α, the spectrum peak position difference that the α particle of different-energy produces.Amplifier is subjected to influencing pulse height and can changing of environmental baseline, and instrument is judged when having this situation to occur, and regulates enlargement factor automatically, and its amplitude is remained unchanged, thereby forms the invariant position at spectrum peak, plays the effect of stablizing peak position.The peak position of the α spectrum of monitoring radon thorium daughter (RaC ' or ThC ') is very easy to realize in the prior art, can directly obtain by various radon daughter alpha energy spectrum surveying instruments.The radon daughter monitor generally adopts semiconductor detector, multichannel analyzer and analysis software etc., and the airborne radon of monitoring of environmental is in real time mixed annex and also can be surveyed radon in soil and the water; Instantaneous sampling is measured video data in the 10min, measurement range 0～10MBq/m3, in establish warning system, can set up radon concentration alarming value on their own, by the interior thermometer of establishing, hygrometer, can get rid of humidity and disturb; Sampling interval can be set at 1min～24h, has wide range of applications.
After obtaining the peak position of α spectrum of radon thorium daughter, just this peak position is monitored in real time.Drift about to low side when the peak position of the α of radon thorium daughter spectrum, illustrate that the pulse enlargement factor reduces, start the linear resistance of regulating enlargement factor, make it to improve the pulse enlargement factor; Otherwise the peak position of the α spectrum of radon thorium daughter illustrates that to high-end drift the pulse enlargement factor raises, and starts the linear resistance of regulating enlargement factor, makes it to reduce the pulse enlargement factor.Method by pulse enlargement factor dynamic adjustable, the peak position of the α spectrum of radon thorium daughter (RaC ' or ThC ') is stabilized in a certain position (as 800 roads) of multichannel analyzer, can realize the maximum stable of electronics performance (pulse enlargement factor), thereby guarantee that set count block keeps maximum stable, because set count block keeps maximum stable, the maximum stable that has also promptly guaranteed long-life alpha count measurement that uranium, plutonium nucleic are produced is with reliable.
Concrete implementation step of the present invention is as follows:
(1) peak position that utilization certainly exists in the air sampling monitoring and easy radon daughter (RaC ') α that monitors composes as discerning the basic sign whether electronics performance (pulse enlargement factor) changes, obtains the peak position of α spectrum by apparatus measures;
(2) variation according to the peak position of radon daughter (RaC ') α spectrum comes the regulating impulse enlargement factor, makes the peak position of α spectrum stable, has also promptly guaranteed the maximum stable of set count block;
(3) the electronics performance is implemented dynamically, adjusted frequently, be equivalent to keep the dynamic and steady in a long-term of electronics performance.
Claims (4)
1. the method that ensures counting and measuring stability in the long-life alpha aerosol monitoring, it is characterized in that: this method is utilized the peak position of resulting radon thorium daughter α spectrum in the air sampling monitoring, as discerning the basic sign whether the electronics performance changes, change according to the peak position of radon thorium daughter α spectrum and to come the regulating impulse enlargement factor, the peak position of radon thorium daughter α spectrum is stabilized in a desired location of multichannel analyzer, thereby has guaranteed the maximum stable of set count block.
2. the method that ensures counting and measuring stability in the long-life alpha aerosol monitoring as claimed in claim 1 is characterized in that: the daughter of described radon thorium is RaC ' or ThC '.
3. the method that ensures counting and measuring stability in the long-life alpha aerosol monitoring as claimed in claim 1 or 2, it is characterized in that: changing the method for coming the regulating impulse enlargement factor according to the peak position of radon thorium daughter α spectrum is: when the peak position of the α of radon thorium daughter spectrum when low side drifts about, start the linear resistance of regulating enlargement factor, make it to improve the pulse enlargement factor; When the peak position of the α of radon thorium daughter spectrum during to high-end drift, start the linear resistance of regulating enlargement factor, make it to reduce the pulse enlargement factor.
4. the method that ensures counting and measuring stability in the long-life alpha aerosol monitoring as claimed in claim 3 is characterized in that: the desired location of described multichannel analyzer is 800 roads.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810226959A CN101738628A (en) | 2008-11-21 | 2008-11-21 | Method for ensuring counting and measuring stability in long-life alpha aerosol monitoring |
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| CN200810226959A CN101738628A (en) | 2008-11-21 | 2008-11-21 | Method for ensuring counting and measuring stability in long-life alpha aerosol monitoring |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102455429A (en) * | 2010-10-27 | 2012-05-16 | 核工业北京地质研究院 | Method for measuring uranium in uranium ore |
| CN103424761A (en) * | 2013-07-29 | 2013-12-04 | 中国原子能科学研究院 | Nuclear energy level service life measuring device |
| US9915600B2 (en) | 2016-02-19 | 2018-03-13 | Research Triangle Institute | Devices, systems and methods for detecting particles |
| CN109814144A (en) * | 2019-01-01 | 2019-05-28 | 中国人民解放军63653部队 | A kind of radon and radon daughter synchro measure and dosage rate evaluation method |
| US10345216B2 (en) | 2014-08-20 | 2019-07-09 | Research Triangle Institute | Systems, devices, and methods for flow control and sample monitoring control |
| US11047787B2 (en) | 2019-04-29 | 2021-06-29 | Research Triangle Institute | And method for optical bench for detecting particles |
| CN113310761A (en) * | 2021-05-08 | 2021-08-27 | 中国辐射防护研究院 | Preparation method of standard aerosol sample containing radionuclide |
-
2008
- 2008-11-21 CN CN200810226959A patent/CN101738628A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102455429A (en) * | 2010-10-27 | 2012-05-16 | 核工业北京地质研究院 | Method for measuring uranium in uranium ore |
| CN103424761A (en) * | 2013-07-29 | 2013-12-04 | 中国原子能科学研究院 | Nuclear energy level service life measuring device |
| CN103424761B (en) * | 2013-07-29 | 2015-06-17 | 中国原子能科学研究院 | Nuclear energy level service life measuring device |
| US10018551B2 (en) | 2014-08-20 | 2018-07-10 | Research Triangle Institute | Devices, systems and methods for detecting particles |
| US10345216B2 (en) | 2014-08-20 | 2019-07-09 | Research Triangle Institute | Systems, devices, and methods for flow control and sample monitoring control |
| US10481070B2 (en) | 2014-08-20 | 2019-11-19 | Research Triangle Institute | Systems, devices, and methods for flow control and sample monitoring control |
| US9915600B2 (en) | 2016-02-19 | 2018-03-13 | Research Triangle Institute | Devices, systems and methods for detecting particles |
| CN109814144A (en) * | 2019-01-01 | 2019-05-28 | 中国人民解放军63653部队 | A kind of radon and radon daughter synchro measure and dosage rate evaluation method |
| US11047787B2 (en) | 2019-04-29 | 2021-06-29 | Research Triangle Institute | And method for optical bench for detecting particles |
| CN113310761A (en) * | 2021-05-08 | 2021-08-27 | 中国辐射防护研究院 | Preparation method of standard aerosol sample containing radionuclide |
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Application publication date: 20100616 |