CN103837558A - Device and method for detecting multiple elements and content thereof in water solution based on PGNAA (Prompt Gamma-Ray Neutron Activation Analysis) technology - Google Patents
Device and method for detecting multiple elements and content thereof in water solution based on PGNAA (Prompt Gamma-Ray Neutron Activation Analysis) technology Download PDFInfo
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Abstract
The invention discloses a device and a method for detecting multiple elements and content thereof in water solution based on a PGNAA (Prompt Gamma-Ray Neutron Activation Analysis) technology, and particularly relates to the device for detecting the content of multiple elements in the water solution by the PGNAA technology. The detection device comprises a sample detection system and an energy spectrum analysis system, wherein the sample detection system comprises an isotope neutron source, a polyethylene wrapping layer and a polyethylene bucket, the isotope neutron source is fixed at the center of the polyethylene wrapping layer, which is at the center of the polyethylene bucket, the energy spectrum analysis system comprises a gamma ray detector, a multichannel analyzer and an industrial control computer, the gamma ray detector clings to the middle high position on the outer wall of the polyethylene bucket, and the gamma ray detector is sequentially connected with the multichannel analyzer and the industrial control computer. Without a large increase in complex equipment, the method and the device can conveniently and accurately detect the content of multiple elements in the solution by the PGNAA technology.
Description
Technical field:
The present invention relates to multielement composition and content detection device and detection method in a kind of aqueous solution based on PGNAA technology, it belongs to the detection technique field of constituent content in aqueous solution.
Background technology:
The highly sensitive detection of the content to constituent content in water body especially some toxic heavy metal elements is the emphasis that people pay close attention to for a long time always.Water environment pollution is monitored technology used at present atomic absorption spectroscopy (AAS), inductively coupled plasma atomic emission (ICP/AES), analytical technique of mass spectrum (ICP/MS), electrochemical analysis and biological monitoring etc.
At present, in Measurement and analysis field, nuclear technology has become a routine techniques.The lot of advantages that it has other analytical technology not have, PGNAA technology is utilized the target nucleus of neutron bombardment tested material, by the reaction such as thermal capture, the inelastic scattering release characteristic gamma rays that (is less than 10-13s) within the extremely short time, can identify most of nucleic and analyze its content quantitative and qualitative analysis by recognition feature gamma rays and the intensity of measuring feature gamma rays.Due to its non-destructive, online in site measurement, analysis precision high, be widely used in recent years each fields such as industry, environment, medicine.
At present, there are various deficiencies in above-mentioned these water environment pollution monitoring technology.Some instruments need be from external import price costliness, and operating cost is high, and what have can not carry out multielement analysis simultaneously, the sample pretreatment program too complex of some technology.
Therefore, the necessary deficiency of prior art being improved to solve prior art.
Summary of the invention:
The present invention seeks to a kind of new device for fast detecting of detection design for constituent content in aqueous solution, in this device employing neutron and aqueous solution, element reacts and produces feature gamma ray, by Measurement and analysis gamma spectra, detect elemental composition and content wherein, its device is simple, and easy to operate have a good practicality.
The present invention adopts following technical scheme: multielement composition and content detection device in a kind of aqueous solution based on PGNAA technology, it comprises specimen inspection system and energy spectrum analysis system, described specimen inspection system comprises isotope neutron source, tygon integument and polyethylene drum composition, described isotope neutron source is fixed and is placed on tygon integument center, described tygon integument is positioned at the center of polyethylene drum, described energy spectrum analysis system is by gamma-ray detector, multichannel analyzer and industrial control computer composition, described gamma-ray detector is close to the medium height position of polyethylene drum outer wall, described gamma-ray detector is connected with multichannel analyzer and industrial control computer successively.
Described isotope neutron source is positioned at the center of polyethylene drum, and the inside radius of described polyethylene drum is 4.8cm, and external radius is 15～16cm, is highly 50cm, and described tygon integument thickness is 0.2cm.
Described isotope neutron source is americium beryllium neutro ource.
Described gamma-ray detector is bismuth germanium oxide BGO detector.
The present invention also adopts following technical scheme: the detection method of multielement composition and content detection device in a kind of aqueous solution based on PGNAA technology, it comprises the steps:
1) sampling procedure: first gather in the sample cavity that water body sample is poured into polyethylene drum, afterwards isotope neutron source is fixed on to the center of polyethylene drum;
2) measuring process: isotope neutron source is by the slowing down of water body, be slow neutron by abundant slowing down, the atomic nucleus generation radiation capture reaction of element in itself and water body afterwards, send and send out feature gamma rays wink, described feature gamma rays is corresponding one by one with element, sending out feature gamma rays described wink is accepted by gamma-ray detector through water body and polyethylene drum, these feature gamma signals enter multichannel analyzer collection and store, then send into the data handling system in industrial control computer, obtain gamma rays power spectrum, the positional representation element kind of characteristic peak in power spectrum, the intensity of characteristic peak represents the content of this element,
3) analytical procedure: utilize Mathematical Method to resolve the characteristic peak of different elements, and revise, finally obtain the corresponding relation of characteristic peak counting in essential element composition kind, content and the power spectrum in aqueous solution, thereby realize ultimate analysis and measurement.
Mathematical Method in described step 3) is least square fitting method.
The present invention has following beneficial effect:
(1). method equipment, step and the environmental requirement of detection are simple;
(2). adopting isotope neutron source directly to carry out slowing down by water body does not need other slowing down device;
(3). the present invention is not needing under the equipment of large amount of complex costliness, can, to the convenient content that detects accurately multiple element in water body, have market potential and be worth.
Accompanying drawing explanation:
Fig. 1 is structural representation of the present invention.
Fig. 2 is the gamma spectra figure of embodiment of the present invention NaCl solution.
Fig. 3 is embodiment of the present invention content of Cl element and characteristic peak counting graph of a relation.
Fig. 4 is the gamma spectra figure of embodiment of the present invention cadmium sulfate solution.
Fig. 5 is embodiment of the present invention cadmium element content and characteristic peak counting graph of a relation.
Embodiment:
Please refer to shown in Fig. 1 to Fig. 5, the present invention is based on multielement composition and content detection device in the aqueous solution of PGNAA technology is made up of a specimen inspection system and a set of energy spectrum analysis system, wherein specimen inspection system comprises isotope neutron source, tygon integument and polyethylene drum, isotope neutron source is americium beryllium neutro ource, be fixed and be placed on tygon integument center, integument is positioned at the center of polyethylene drum, be the center that isotope neutron source is positioned at polyethylene drum, additionally do not increase any slow body structure.The space occupying except tygon integument, all see the sample cavity of polyethylene drum as in polyethylene drum.Wherein tygon integument thickness is 0.2cm, and the inside radius of polyethylene drum is 4.8cm, and external radius is 15～16cm, is highly 50cm.The sample cavity in polyethylene drum chamber is used for placing water body sample, can hold 35 premium on currency bodies, and water body is testing sample, is simultaneously also the moderator of neutron, neutron in water body by after slowing down with water body in element react and produce feature gamma ray.Energy spectrum analysis system is made up of gamma-ray detector (as bismuth germanium oxide (BGO) detector), multichannel analyzer and industrial control computer, wherein gamma-ray detector is close to the medium height position of polyethylene drum outer wall, and gamma-ray detector is connected with multichannel analyzer and industrial control computer successively.
When the present invention specifically implements, BGO detector can be bought from detector crystal production firm, as 4 × 4 inches of BGO detectors of Saint Gobain company production.Isotope neutron source also can directly be bought from company, as the 0.3mCi americium beryllium neutro ource of China Isotope Co..Multichannel analyzer can be bought, as the DigiBase multichannel analyzer of ORTEC company.Polyethylene device bucket carries out unique design according to the character of isotope neutron source.
The present invention is based on the detection method of multielement composition and content detection device in the aqueous solution of PGNAA technology comprises the steps:
1) sampling procedure: first gather approximately 35 liters, water body sample, after pouring in polyethylene drum chamber, water sample height need reach 50cm, afterwards isotope neutron source is fixed on to the center of polyethylene drum;
2) measuring process: isotope neutron source is by the slowing down of water body, be slow neutron by abundant slowing down, the atomic nucleus generation radiation capture reaction of essential element in itself and water body afterwards, send and send out feature gamma rays wink, these feature gamma rayss are unique, just as people's fingerprint, be commonly called as core fingerprint, one to one with element, sending out feature gamma rays these winks is accepted by BGO detector through water body and polyethylene drum, these feature gamma signals enter multichannel analyzer collection and store, then send into the data handling system in industrial control computer, obtain gamma rays power spectrum, the positional representation element kind of characteristic peak in power spectrum, the intensity of characteristic peak represents the content of this element,
3) analytical procedure: utilize Mathematical Method the characteristic peak of different elements to be resolved as methods such as least square fittings, and revise, finally obtain the corresponding relation of characteristic peak counting in essential element composition kind, content and the power spectrum in aqueous solution, thereby realize ultimate analysis and measurement.
Embodiment 1
Chlorine unit cellulose solution is measured
This example adopts NaCl solution sample, is 0.1%, 0.2%, 0.3%, 0.4%, 0.5% NaCl solution with distilled water preparation chlorine elemental mass concentration.Adopt prompt fission gammas's ray INAA collection analysis to obtain power spectrum.Fig. 2 has recorded each prompt fission gammas's ray of Cl element of the impact of deduction environmental exact details, can it is evident that the power spectrum of variable concentrations Cl element under identical environment has significant difference.Be respectively from low to high 0.1,0.2,0.3,0.4 and the Cl elemental characteristic gamma ray of 0.5wt%.Fig. 3 is the linear graduation of characteristic peak counting and constituent content, and its linearly dependent coefficient is better than 0.995.
Embodiment 2
This example adopts cadmium sulfate solution sample, is 0.1%, 0.2%, 0.3%, 0.4%, 0.5% cadmium sulfate solution by distilled water preparation cadmium element mass concentration.Adopt prompt fission gammas's ray INAA collection analysis to obtain power spectrum.Fig. 4 has recorded each prompt fission gammas's ray of cadmium element of the impact of deduction environmental exact details, can it is evident that the power spectrum of variable concentrations cadmium element under identical environment has significant difference.Be respectively from low to high 0.1,0.2,0.3,0.4 and the cadmium element feature gamma ray of 0.5wt%.Fig. 5 is the linear graduation of revising rear characteristic peak counting and constituent content, and its linearly dependent coefficient is better than 0.995.
The above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art, can also make under the premise without departing from the principles of the invention some improvement, and these improve and also should be considered as protection scope of the present invention.
Claims (6)
1. multielement composition and content detection device in the aqueous solution based on PGNAA technology, it comprises specimen inspection system and energy spectrum analysis system, it is characterized in that: described specimen inspection system comprises isotope neutron source, tygon integument and polyethylene drum composition, described isotope neutron source is fixed and is placed on tygon integument center, described tygon integument is positioned at the center of polyethylene drum, described energy spectrum analysis system is by gamma-ray detector, multichannel analyzer and industrial control computer composition, described gamma-ray detector is close to the medium height position of polyethylene drum outer wall, described gamma-ray detector is connected with multichannel analyzer and industrial control computer successively.
2. multielement composition and content detection device in the aqueous solution based on PGNAA technology as claimed in claim 1, it is characterized in that: described isotope neutron source is positioned at the center of polyethylene drum, the inside radius of described polyethylene drum is 4.8cm, external radius is 15～16cm, be highly 50cm, described tygon integument thickness is 0.2cm.
3. multielement composition and content detection device in the aqueous solution based on PGNAA technology as claimed in claim 2, is characterized in that: described isotope neutron source is americium beryllium neutro ource.
4. multielement composition and content detection device in the aqueous solution based on PGNAA technology as claimed in claim 3, is characterized in that: described gamma-ray detector is bismuth germanium oxide BGO detector.
5. a detection method for multielement composition and content detection device in the aqueous solution based on PGNAA technology as claimed in claim 1, is characterized in that: comprise the steps
1) sampling procedure: first gather in the sample cavity that water body sample is poured into polyethylene drum, afterwards isotope neutron source is fixed on to the center of polyethylene drum;
2) measuring process: isotope neutron source is by the slowing down of water body, be slow neutron by abundant slowing down, the atomic nucleus generation radiation capture reaction of element in itself and water body afterwards, send and send out feature gamma rays wink, described feature gamma rays is corresponding one by one with element, sending out feature gamma rays described wink is accepted by gamma-ray detector through water body and polyethylene drum, these feature gamma signals enter multichannel analyzer collection and store, then send into the data handling system in industrial control computer, obtain gamma rays power spectrum, the positional representation element kind of characteristic peak in power spectrum, the intensity of characteristic peak represents the content of this element,
3) analytical procedure: utilize Mathematical Method to resolve the characteristic peak of different elements, and revise, finally obtain the corresponding relation of characteristic peak counting in elemental composition kind, content and the power spectrum in aqueous solution, thereby realize ultimate analysis and measurement.
6. the detection method of multielement composition and content detection device in the aqueous solution based on PGNAA technology as claimed in claim 5, is characterized in that: the Mathematical Method in described step 3) is least square fitting method.
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Cited By (20)
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| CN104655664A (en) * | 2015-01-27 | 2015-05-27 | 南京航空航天大学 | Method and device for in-situ detection of multiple elements and contents in water body |
| CN105785418A (en) * | 2016-03-07 | 2016-07-20 | 中国水产科学研究院东海水产研究所 | Method for detecting radioactive nuclear radiation element in body of squid in North Pacific Ocean |
| CN106338531A (en) * | 2016-10-11 | 2017-01-18 | 吉林大学 | Detection structure for analyzing elementary components in flow liquid slurry based on PGNAA technique |
| CN107272048A (en) * | 2017-07-07 | 2017-10-20 | 西南科技大学 | A kind of complicated nuclide identification method based on fuzzy decision-tree |
| CN107290372A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | A kind of online neutron activation alkalinity analyzing device of reflective sintering feed and analysis method |
| CN107290366A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | A kind of application process of online bauxite aluminium-silicon of transmission-type neutron activation than analyzer |
| CN107290365A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | A kind of application process of the online sintering feed alkalinity analyzing instrument of transmission-type neutron activation |
| CN107290354A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | A kind of online neutron activation alkalinity analyzing device of transmission-type sintering feed and analysis method |
| CN107290355A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | The online neutron activation alumina silica ratio analytical equipment of transmission-type bauxite and analysis method |
| CN107290369A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | A kind of application process of the online sintering feed alkalinity analyzing instrument of reflective neutron activation |
| CN107290370A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | A kind of application process of online bauxite aluminium-silicon of reflective neutron activation than analyzer |
| CN107290373A (en) * | 2016-03-31 | 2017-10-24 | 丹东东方测控技术股份有限公司 | The device and analysis method of the reflective online neutron activation analysis alumina silica ratio of bauxite |
| CN107490591A (en) * | 2017-04-19 | 2017-12-19 | 安徽华脉科技发展有限公司 | A kind of heavy metal in soil content detection device |
| CN108535299A (en) * | 2018-03-07 | 2018-09-14 | 南京航空航天大学 | Explosion-proof detection integrated apparatus in high precision |
| CN108535300A (en) * | 2018-05-11 | 2018-09-14 | 南京航空航天大学 | A kind of built-in neutron Atomic Absorption SpectrophotometerICP |
| CN108680943A (en) * | 2018-05-11 | 2018-10-19 | 南京航空航天大学 | A kind of neutron spectrum measurement device and method based on prompt gamma ray neutron activation analysis technique |
| CN108918565A (en) * | 2018-05-11 | 2018-11-30 | 南京航空航天大学 | A kind of sample Elemental redistribution measuring device and method based on prompt gamma ray neutron activation analysis technique |
| CN112444532A (en) * | 2019-08-10 | 2021-03-05 | 丹东东方测控技术股份有限公司 | Method for measuring total iron content in sintered material on line |
| CN114152639A (en) * | 2021-11-19 | 2022-03-08 | 四川大学 | Gamma neutron activation analysis method capable of removing neutron interference |
| CN115616010A (en) * | 2022-12-19 | 2023-01-17 | 合肥金星智控科技股份有限公司 | Material component detection method and detection device based on cross-belt neutron activation analysis |
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