CN103543462A - Nuclide recognition device of radioactive aerosol - Google Patents
Nuclide recognition device of radioactive aerosol Download PDFInfo
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- CN103543462A CN103543462A CN201310486992.9A CN201310486992A CN103543462A CN 103543462 A CN103543462 A CN 103543462A CN 201310486992 A CN201310486992 A CN 201310486992A CN 103543462 A CN103543462 A CN 103543462A
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- lanthanum bromide
- nuclide
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- radioaerosol
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Abstract
The invention relates to the technical field of radiation detection and provides a nuclide recognition device using lanthanum bromide to measure radioactive aerosol in the air. The nuclide recognition device comprises an aerosol detecting system, an air flow circuit system and an electric system. The aerosol detecting system comprises a gas sampling circuit, a lanthanum bromide detector and an automatic paper feed mechanism. The lanthanum bromide detector is fixed in a cavity formed by the gas sampling circuit. The automatic paper feed mechanism is disposed at the outlet of the gas sampling circuit. The gas sampling circuit comprises a rotary drum and filter paper fixed at two ends. The nuclide recognition device has the advantages that the lanthanum bromide detector is used to detect the gamma ray generated by the radioactive nuclide, nuclide recognition capability of the device is increased greatly, and environmental background can be removed easily.
Description
Technical field
The present invention relates to nuclear radiation detection technical field, be specifically related to utilize in environmental monitoring the nuclide identification device of radioaerosol in lanthanum bromide detector measurement atmosphere.
Background technology
In the day-to-day operation of nuclear power station, the integrality of reactor-loop pressure-bearing boundary and containment is most important, when there is major accident in power station, both are destroyed, various artificial radionuclides can be discharged into rapidly among ambient atmosphere with aerocolloidal form, therefore sampling of aerosol monitoring point can be set in power station around, by the radioaerosol concentration of measuring in atmosphere, determine power station radioactive contamination degree around under accident conditions.
Domestic and international adopted radioaerosol monitoring method is generally launched by detectable radionuclide at present α, β ray are realized, the type photodetector using mostly also is PIPS semiconductor, this measuring method is placed in sampled radioaerosol the place ahead by PIPS semiconductor detector, thereby obtains α, the β spectrum of radioactive nuclide.There is certain shortcoming in this method, because the β spectrum of radioactive nuclide is extended wider, and be distributed in low energy part more, the β spectrum of measuring various nucleic in power spectrum is overlapping serious, be difficult to distinguish, simultaneously due to the aerocolloidal interference of natural radon thorium family, the identification for various nucleic α spectrums in measuring power spectrum is also limited, therefore this measuring method cannot be differentiated measured radioaerosol nucleic kind, is also not easy to deduct the impact of environmental exact details on measurement result.
Summary of the invention
Object of the present invention is exactly the deficiency that cannot differentiate nucleic kind and be difficult to deduct environmental exact details in order to overcome existing measuring method, and a kind of radioaerosol nuclide identification device is provided
,the radioaerosol being mainly used in environmental monitoring is measured, and the gamma-rays that the present invention utilizes lanthanum bromide detector detectable radionuclide to produce has improved the nucleic resolution characteristic of installing greatly, also makes the deduction of environmental exact details be more prone to.
The object of the invention is to be achieved by the following technical measures: a kind of radioaerosol nuclide identification device, comprise aerosol detection system, gas flow loop system and three parts of electrical system, described aerosol detection system comprises gas sample loop, lanthanum bromide detector and mechanism for automatically feeding paper, described lanthanum bromide detector is fixed in the cavity of gas sample loop formation, the exit in gas sample loop is provided with mechanism for automatically feeding paper, and cylinder and filter paper that mechanism for automatically feeding paper is fixed by two ends form.
In technique scheme, described gas flow loop system is comprised of valve, pressure gauge, flowmeter, thermometer, aspiration pump and corresponding pipeline thereof, jointly form complete gas flow loop with gas sample loop, the entrance of described gas flow loop is provided with stop valve, the outlet of gas flow loop is provided with variable valve, aspiration pump and stop valve successively, is provided with pressure gauge, flowmeter and thermometer in described gas flow loop.
In technique scheme, described electrical system comprises signal processing unit and junction box, the input end of described signal processing unit is connected with the output terminal of lanthanum bromide detector, described junction box is connected with the output terminal of pressure gauge, flowmeter, thermometer and signal processing unit and is connected with the power end of aspiration pump, and described junction box is connected with upper layer data analytic system with external power source.
In technique scheme, described aerosol detection system is arranged in lead shield body.
In technique scheme, the lanthanum bromide detector of described aerosol detection system connects active inspection device, and source inspection device is connected with junction box.
The present invention has good energy resolution characteristic and relatively large journey scope, to gamma-ray detection energy range, is 100KeV～3MeV, and the radioaerosol concentration range that can measure is 1.0～1.0 * 10
6bq/m
3, can differentiate natural radionuclide (
214pb and
214bi) and
131i,
134cs,
137cs,
132the artificial radionuclides such as Te, for the monitoring of radioaerosol concentration in environmental monitoring and kind provides a kind of effective measuring method.
Accompanying drawing explanation
Fig. 1 is radioaerosol nuclide identification system structure of device schematic diagram of the present invention.
Fig. 2 is the structural representation of aerosol detection system in the present invention.
Wherein: 1. admission line, cavity that 2. gas sample loop forms, 3. air-flow interlayer, 4. lanthanum bromide detector, 5. lanthanum bromide crystal, 6. fixed sturcture, 7. filter paper, 8. cylinder, 9. mechanism for automatically feeding paper, 10. outlet pipe, 11. lead shield bodies.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1, 2, the present embodiment provides a kind of radioaerosol nuclide identification device, aerosol detection system, gas flow loop system and three parts of electrical system, consists of.Aerosol detection system is arranged among the lead shield body 11 that 5cm is thick, and lanthanum bromide detector 4 is fixed among the cavity 2 that gas sample loop forms by fixed sturcture 6.Lanthanum bromide detector 4 use lanthanum bromide crystal 5 are realized gamma-ray spectral measurement as probing medium, and the use of lanthanum bromide detector 4 makes the present invention can in measurement environment radiation level, differentiate the kind of nucleic.Lanthanum bromide detector 4 is furnished with source inspection device, for checking whether lanthanum bromide detector lost efficacy.The exit in gas sample loop is provided with mechanism for automatically feeding paper, and cylinder 8 and filter paper 7 that mechanism for automatically feeding paper is fixed by two ends form.Gas sample loop has serial sampling function, and gas enters gas sample loop through admission line 1, flows through after air-flow interlayer 3 and filter paper 7, through outlet pipe 10, flows out.The filter paper that mechanism for automatically feeding paper 9 more renews automatically according to the service condition of filter paper 7, extends the maintenance period of apparatus of the present invention.
Described gas flow loop system is comprised of valve, pressure gauge, flowmeter, thermometer, aspiration pump and corresponding pipeline thereof, jointly form complete gas flow loop with gas sample loop, the entrance of described gas flow loop is provided with stop valve, the outlet of gas flow loop is provided with variable valve, aspiration pump and stop valve successively, in described gas flow loop, be provided with pressure gauge, flowmeter and thermometer, whole loop provides free air space for gas, and keeps impermeability.Gas flow is by valve regulated, and outputs to junction box through flowmeter, and pressure gauge externally provides pressure signal, and thermometer is for the temperature variation of gas-monitoring, and aspiration pump provides driving force for gas communication.
Described electrical system comprises signal processing unit and junction box, the input end of described signal processing unit is connected with the output terminal of lanthanum bromide detector, the built-in prime amplifier of lanthanum bromide detector, after the output signal of photomultiplier is amplified, outputs to signal processing unit through cable; Described junction box is connected with the output terminal of pressure gauge, flowmeter, thermometer and signal processing unit and is connected with the power end of aspiration pump, and described junction box is connected with upper layer data analytic system with external power source.Electrical system provides power input for aspiration pump, and the electric signal that receives lanthanum bromide detector and all instrument is exported, wherein signal processing unit has spectral measurement ability, and to obtaining the gamma spectrum of nucleic after input signal sampling, junction box is used for gathering all measuring-signals.
Obtain after gamma spectrum, signal processing unit utilizes peak-seeking and fitting algorithm to identify the position at energy peak, and tell the nucleic kind in power spectrum in conjunction with the information in nuclide library, radioactive background in deduction power spectrum, then nucleic power spectrum and the illiteracy snap gauge plan power spectrum of measuring in advance of take is basic data, power spectrum is decomposed, thereby calculate the content of various nucleic.
Apparatus of the present invention have realized the aerocolloidal monitoring method of a kind of Novel radioactive, and specific implementation method is as follows:
1, device for opening power supply, junction box controls aspiration pump and opens, and makes gas to be measured enter gas flow loop by entrance and circulates, and utilizes variable valve adjusting gas flow to designated value;
2, gas to be measured enters aerosol detection internal system through stop valve and admission line, radioaerosol in gas is got off by Filter paper filtering, gas is flowed out by outlet pipe afterwards, and effluent stream loop after stop valve and aspiration pump, completes the whole process of circulation;
3, lanthanum bromide detector is arranged on filter paper the place ahead, the gamma-rays that detectable radionuclide sends, and the built-in prime amplifier of detector, after the output signal of photomultiplier is amplified, outputs to signal processing unit through cable;
4, signal processing unit acquisition pulse signal obtains power spectrum, according to background rejection algorithm, the environmental exact details in power spectrum is deducted, gamma-spectrometric data is carried out to pre-service, and utilize the spectrum unscrambling Algorithm Analysis gamma-spectrometric data based on nuclide identification, obtain the nucleic kind of radioaerosol;
5, junction box gathers the output signal of all instrument, by bus, to upper strata, exports data, and controls aspiration pump and the operation of source checking device.
Claims (5)
1. a radioaerosol nuclide identification device, comprise aerosol detection system, gas flow loop system and three parts of electrical system, it is characterized in that: described aerosol detection system comprises gas sample loop, lanthanum bromide detector and mechanism for automatically feeding paper, described lanthanum bromide detector is fixed in the cavity of gas sample loop formation, the exit in gas sample loop is provided with mechanism for automatically feeding paper, and cylinder and filter paper that mechanism for automatically feeding paper is fixed by two ends form.
2. radioaerosol nuclide identification device according to claim 1, it is characterized in that: described gas flow loop system is comprised of valve, pressure gauge, flowmeter, thermometer, aspiration pump and corresponding pipeline thereof, jointly form complete gas flow loop with gas sample loop, the entrance of described gas flow loop is provided with stop valve, the outlet of gas flow loop is provided with variable valve, aspiration pump and stop valve successively, is provided with pressure gauge, flowmeter and thermometer in described gas flow loop.
3. radioaerosol nuclide identification device according to claim 1, it is characterized in that: described electrical system comprises signal processing unit and junction box, the input end of described signal processing unit is connected with the output terminal of lanthanum bromide detector, the built-in prime amplifier of lanthanum bromide detector, after the output signal of photomultiplier is amplified, through cable, output to signal processing unit; Described junction box is connected with the output terminal of pressure gauge, flowmeter, thermometer and signal processing unit and is connected with the power end of aspiration pump, and described junction box is connected with upper layer data analytic system with external power source.
4. radioaerosol nuclide identification device according to claim 1, is characterized in that: described aerosol detection system is arranged in lead shield body.
5. radioaerosol nuclide identification device according to claim 1, is characterized in that: the lanthanum bromide detector of described aerosol detection system connects active inspection device, and source inspection device is connected with junction box.
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| CN201310486992.9A CN103543462A (en) | 2013-10-17 | 2013-10-17 | Nuclide recognition device of radioactive aerosol |
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| CN201310486992.9A CN103543462A (en) | 2013-10-17 | 2013-10-17 | Nuclide recognition device of radioactive aerosol |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166154A (en) * | 2014-06-26 | 2014-11-26 | 中国核电工程有限公司 | PIG sampling and monitoring system and method |
| CN105549065A (en) * | 2015-12-09 | 2016-05-04 | 中国船舶重工集团公司第七一九研究所 | Artificial radioactive aerosol source machine |
| CN106125126A (en) * | 2016-07-30 | 2016-11-16 | 清华大学 | The method of the potassium 40 in employing lanthanum bromide detector measurement environment |
| CN106297931A (en) * | 2016-08-20 | 2017-01-04 | 中国船舶重工集团公司第七〇九研究所 | A kind of radioaerosol high-efficient purification retracting device and method of work thereof |
| CN106291655A (en) * | 2016-08-23 | 2017-01-04 | 中国船舶重工集团公司第七〇九研究所 | A kind of airborne radioactivity monitor |
| CN108761515A (en) * | 2018-06-06 | 2018-11-06 | 成都理工大学 | A kind of aerosol on-line water flushing device |
| CN109254316A (en) * | 2018-10-16 | 2019-01-22 | 陕西卫峰核电子有限公司 | A kind of nuclear power station aerosol continuous radiation monitoring device |
| CN111913206A (en) * | 2020-07-22 | 2020-11-10 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Movable airborne radioactivity online monitoring system and method |
| CN112394385A (en) * | 2020-10-22 | 2021-02-23 | 中国原子能科学研究院 | Sampling and monitoring method for radioactive sodium aerosol |
| CN112764081A (en) * | 2020-12-28 | 2021-05-07 | 陕西卫峰核电子有限公司 | Real-time detection device for radioactive aerosol |
| CN112882083A (en) * | 2021-03-01 | 2021-06-01 | 中国人民解放军63653部队 | High-sensitivity multi-path radioactive gas on-line monitor |
| CN113588357A (en) * | 2021-08-04 | 2021-11-02 | 中国科学院上海应用物理研究所 | Automatic paper feeding, sampling and measuring device for radioactive aerosol |
| CN114459835A (en) * | 2022-02-11 | 2022-05-10 | 中国核动力研究设计院 | Portable radioactive aerosol monitor and monitoring method |
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| CN2856982Y (en) * | 2005-12-23 | 2007-01-10 | 中国辐射防护研究院 | Continuous sampling paper feeding integrated device for radiative aerosol |
| CN102422150A (en) * | 2009-05-26 | 2012-04-18 | 克罗梅克有限公司 | Method for the identification of materials in a container |
| CN103091213A (en) * | 2011-10-27 | 2013-05-08 | 中国人民解放军海军核化安全研究所 | Roll type paper feeding and sampling apparatus for radioactive aerosol continuous monitor |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166154A (en) * | 2014-06-26 | 2014-11-26 | 中国核电工程有限公司 | PIG sampling and monitoring system and method |
| CN104166154B (en) * | 2014-06-26 | 2017-02-15 | 中国核电工程有限公司 | PIG sampling and monitoring system and method |
| CN105549065B (en) * | 2015-12-09 | 2018-12-18 | 中国船舶重工集团公司第七一九研究所 | A kind of artificial radioactive aerosol source machine |
| CN105549065A (en) * | 2015-12-09 | 2016-05-04 | 中国船舶重工集团公司第七一九研究所 | Artificial radioactive aerosol source machine |
| CN106125126A (en) * | 2016-07-30 | 2016-11-16 | 清华大学 | The method of the potassium 40 in employing lanthanum bromide detector measurement environment |
| CN106297931A (en) * | 2016-08-20 | 2017-01-04 | 中国船舶重工集团公司第七〇九研究所 | A kind of radioaerosol high-efficient purification retracting device and method of work thereof |
| CN106297931B (en) * | 2016-08-20 | 2018-03-06 | 中国船舶重工集团公司第七一九研究所 | A kind of radioaerosol high-efficient purification retracting device and its method of work |
| CN106291655B (en) * | 2016-08-23 | 2019-12-31 | 中国船舶重工集团公司第七一九研究所 | Airborne radioactivity monitor |
| CN106291655A (en) * | 2016-08-23 | 2017-01-04 | 中国船舶重工集团公司第七〇九研究所 | A kind of airborne radioactivity monitor |
| CN108761515A (en) * | 2018-06-06 | 2018-11-06 | 成都理工大学 | A kind of aerosol on-line water flushing device |
| CN108761515B (en) * | 2018-06-06 | 2022-02-18 | 成都理工大学 | Aerosol on-line detector |
| CN109254316A (en) * | 2018-10-16 | 2019-01-22 | 陕西卫峰核电子有限公司 | A kind of nuclear power station aerosol continuous radiation monitoring device |
| CN109254316B (en) * | 2018-10-16 | 2023-12-29 | 陕西卫峰核电子有限公司 | Nuclear power station aerosol continuous radiation monitoring device |
| CN111913206A (en) * | 2020-07-22 | 2020-11-10 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | Movable airborne radioactivity online monitoring system and method |
| CN112394385B (en) * | 2020-10-22 | 2023-08-18 | 中国原子能科学研究院 | Sampling and monitoring method for radioactive sodium aerosol |
| CN112394385A (en) * | 2020-10-22 | 2021-02-23 | 中国原子能科学研究院 | Sampling and monitoring method for radioactive sodium aerosol |
| CN112764081A (en) * | 2020-12-28 | 2021-05-07 | 陕西卫峰核电子有限公司 | Real-time detection device for radioactive aerosol |
| CN112882083A (en) * | 2021-03-01 | 2021-06-01 | 中国人民解放军63653部队 | High-sensitivity multi-path radioactive gas on-line monitor |
| CN113588357A (en) * | 2021-08-04 | 2021-11-02 | 中国科学院上海应用物理研究所 | Automatic paper feeding, sampling and measuring device for radioactive aerosol |
| CN113588357B (en) * | 2021-08-04 | 2024-05-03 | 上海中科新核智能科技有限公司 | Automatic paper feeding sampling and measuring device for radioactive aerosol |
| CN114459835A (en) * | 2022-02-11 | 2022-05-10 | 中国核动力研究设计院 | Portable radioactive aerosol monitor and monitoring method |
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Application publication date: 20140129 |