CN105628715A - Potassium measuring instrument of sodium iodide crystals of raw material potassium ores - Google Patents
Potassium measuring instrument of sodium iodide crystals of raw material potassium ores Download PDFInfo
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- CN105628715A CN105628715A CN201511027331.5A CN201511027331A CN105628715A CN 105628715 A CN105628715 A CN 105628715A CN 201511027331 A CN201511027331 A CN 201511027331A CN 105628715 A CN105628715 A CN 105628715A
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
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Abstract
The invention discloses a potassium measuring instrument of sodium iodide crystals of raw material potassium ores. The potassium measuring instrument comprises a detector, a signal analysis system and a data processing system, wherein the detector is used for detecting 1.46MeV gamma rays which are radiated when 40K decaying is detected, so as to generate a pulse signal; the signal analysis system is used for analyzing the generated pulse signal to generate energy spectrum information; the data processing system is used for acquiring the energy spectrum information, drawing the energy spectrum information into an energy spectrum curve, comparing the energy spectrum curve with a standard curve in the system and calculating and displaying the content of potassium ions; the detector comprises a scintillating medium, a photomultiplier, a pre-amplifier, an optical component and a photon gathering part; after the scintillating medium and the gamma rays which are emitted into the scintillating medium have a photoelectric effect, photons are generated; the photomultiplier is used for receiving the photons and converting the photons into a pulse signal; the pre-amplifier is used for amplifying the pulse signal; the optical component is used for reflecting the photons; the photon gathering part is used for gathering the photons and transmitting the photons to an optical cathode of the photomultiplier. The potassium measuring instrument of the sodium iodide crystals of the raw material potassium ores has lower detection limit and smaller relative errors.
Description
Technical field
The invention belongs to potassium element field of measuring technique, specifically, it relates to a kind of raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector.
Background technology
In sylvite production process, the task of potassium raw material Kuang Jin sample workshop section by transport tape, potassium raw material ore deposit is transported to workshop process. The content of potassium ion in potassium raw material ore deposit on dynamic monitoring Jin Yang workshop section transport tape real-time, quickly and accurately, and be uploaded to main industrial computer and revise other processing parameter, the recovery ratio of potash fertilizer can be improved, and stablize potash fertilizer grade.
The method of routine measurement potassium content mainly relies on manual site to sample, with weighting method, volumetry or analyze with the instrument such as ion selective electrode, atomic absorption, these method complicated operations are loaded down with trivial details, required time is long, can not on-line continuous, the real time measure, the processing of sylvite cannot be met. Radiometry potassium content is based on potassium three kinds of natural isotopics39K��40K and41In K, only40K has radioactivity, and its transformation period is 1.25 �� 109Year, abundance is 0.012%. Due to40The transformation period of K is very long, therefore can think40The content of K in potassium element is fixing, it is possible to by its radioactive mensuration, and then extrapolates total potassium content or the content of other potassium isotropic substance. ?40In the decay process of K, it is possible to radiate have continuous spectrum, beta maximum energy be the �� ray of 1.33MeV, radiate the gamma-rays that energy is 1.46MeV simultaneously. So can with measuring40�� ray that K radiates or gamma-rays are to measure the content of potassium in testing sample. Gamma-rays energy spectrum analysis is one of the most important task of nuclear radiation measurement, and gamma-rays energy depressive spectroscopy is the most basic instrument of nuclear radiation energy spectrum analysis, and it is the continuous curve of the differentiated pulse amplitude spectrum produced under the various condition of survey record. General is all that the standard model of same known elements and content compares, or with the typical curve matching of known elements and content, it is determined as which kind of element, by the big I of area under peak determine this constituent content number.
At present external main application is online single track energy spectrometer, is arranged on the top of sylvite Jin Yang workshop section belt conveyor, and the bottom of belt conveyor fills a radioactive source (normally137Cs)��137The gamma-rays of Cs is through a potassium raw material ore deposit decay part, the potassium content of the pulse counting that single track energy spectrometer receives in potassium raw material ore deposit is fixed in a smaller scope when substantially stablizing, but the transport tape of above-mentioned testing method needs radioactive source is housed, safeguards to on-the-spot installation and technology and bring hidden danger.
Summary of the invention
For solving above-mentioned prior art Problems existing, the present invention provides a kind of raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector, and the size of described raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector scintillator wherein is bigger so that the relative error of test is less, being no more than 3%, precision is more accurate.
In order to reach foregoing invention object, present invention employs following technical scheme:
A kind of raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector, comprising: detector, and described detector is used for sampling detection online or immediately40The gamma-rays of the 1.46MeV of radiation when K decays, to generate pulse signal; Signal Analysis System, described Signal Analysis System is for analyzing described pulse signal, and produces spectral information; Data handling system, described data handling system gathers described spectral information, is depicted as spectrum curve and is contrasted by typical curve built-in to itself and described data handling system, calculates and shows the content of potassium ion; Described typical curve is the relation curve of the content of potassium ion in the pulsimeter digit rate of described raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector and potassium sample; Described detector comprises: scintillator, described scintillator be used for the gamma-rays generation photovoltaic effect injected in it after produce photon; Photomultiplier, described photomultiplier is for receiving described photon, and is described pulse signal by described photon conversion; Prime amplifier, described prime amplifier is for amplifying described pulse signal; Optical module, described optical module is arranged on the sidewall of described scintillator, to be reflected by described photon until described photon transfer is to described photon gathering member place; And photon gathering member, described photon gathering member is arranged on the surface relative with described photomultiplier of described scintillator, to be undertaken collecting by the described photon that described scintillator emission and described optical module reflects and be passed to the photocathode place of described photomultiplier.
Further, described optical module comprises the reflectance coating and photomask folded into successively on the sidewall being arranged on described scintillator.
Further, the material of described photon gathering member is optics silicone oil.
Further, the material of described scintillator is the NaI:Tl crystal of diameter 130mm, height 130mm.
Further, the diameter of described photomultiplier is 130mm.
Further, described raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector also comprises: shielded cell; Described shielded cell is sheathed on outside described scintillator.
Further, the material of described shielded cell is the stereotype that thickness is no less than 2cm.
Further, described Signal Analysis System comprises linear amplifier and multichannel pulse amplitude analyzer; Described linear amplifier is for amplifying described pulse signal, and described multichannel pulse amplitude analyzer is for screening the pulse signal amplified through described linear amplifier, and produces the spectral information in 1024 roads; Described data handling system comprises data acquisition module, data processing module and data display module; Described data acquisition module is for gathering described spectral information, and described spectral information is transported to described data processing module; Described spectral information is depicted as described spectrum curve by described data processing module, and is contrasted by typical curve built-in to described spectrum curve and described data handling system, calculates the content trying to achieve potassium ion; Described data display module is for showing the content of described potassium ion.
Further, described multichannel pulse amplitude analyzer carries out communication by RS-485 interface and described data handling system.
Further, described typical curve is determined according to the standard model of the content measuring some known potassium ions; The slope calculation formula of described typical curve represents: K=(NT-NB)/C; Wherein, NTRepresent in the sodium iodide crystal Intelligence potassium detector of described raw material potassium ore deposit the pulsimeter digit rate of the standard model between 750 Dao Zhi 850 roads, NBRepresenting in the sodium iodide crystal Intelligence potassium detector of described raw material potassium ore deposit the pulsimeter digit rate of the background sample between 750 Dao Zhi 850 roads, C represents the content of potassium ion in standard model.
The useful effect of the present invention is:
This raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector adopts to be measured40The gamma-rays that K decay produces measures the content of potassium, has good detection efficiency and measuring accuracy, it is possible to remove environmental background preferably so that the take off data arrived is more accurate; Large-sized scintillator of the present invention is material taking sodium iodide crystal, makes that test relative error is less, detection limit is lower.
Accompanying drawing explanation
The following description carried out in conjunction with the drawings, the above-mentioned and other side of embodiments of the invention, feature and advantage will become clearly, in accompanying drawing:
Fig. 1 is the structural representation of raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector according to an embodiment of the invention;
Fig. 2 is the structural representation of detector according to an embodiment of the invention;
Fig. 3 is the partial enlargement figure in A region in Fig. 2;
Fig. 4 is the energy spectrogram of raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector according to an embodiment of the invention.
Embodiment
Hereinafter, come with reference to the accompanying drawings to describe embodiments of the invention in detail. But, it is possible to implement the present invention in many different forms, and the present invention should not be interpreted as limiting in the specific embodiment set forth here. On the contrary, it is provided that these embodiments are the principle in order to explain the present invention and practical application thereof, thus enable others skilled in the art understand the present invention various embodiment and be suitable for certain expected application various amendments. , it is possible to exaggerate the shape and size of element, in the accompanying drawings, for the sake of clarity and identical label will be used to indicate same or similar element all the time.
Fig. 1 is the structural representation of raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector according to an embodiment of the invention.
According to Fig. 1, comprise detector 1, Signal Analysis System 2, data handling system 3 and shielded cell 4 according to the raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector of the present embodiment; Wherein, detector 1 is for sampling detection online or immediately40The gamma-rays of the 1.46MeV of radiation when K decays, to generate pulse signal; Signal Analysis System 2 is analyzed for detector 1 detects the described pulse signal of generation, and produces spectral information; The described spectral information that data handling system 3 acquired signal analytical system 2 produces, is depicted as spectrum curve and is contrasted by typical curve built-in to itself and data handling system 3, calculates and shows the content of potassium ion; Described typical curve is the relation curve of the content of potassium ion in the pulsimeter digit rate of this raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector and potassium sample.
Specifically, with reference to, shown in Fig. 2 and Fig. 3, detector 1 comprises: scintillator 11, photomultiplier 12, prime amplifier 13, optical module 14 and photon gathering member 15; Wherein, scintillator 11 for the gamma-rays generation photovoltaic effect injected in it after produce photon; The photon that photomultiplier 12 is launched for receiving scintillator 11, and be pulse signal by this photon conversion; The pulse signal that prime amplifier 13 generates for amplifying in photomultiplier 12; Optical module 14 is arranged on the sidewall of scintillator 11, reflects until this photon transfer is to photon gathering member 15 place with the photon launched by scintillator 11; Photon gathering member 15 is arranged on the surface relative with photomultiplier 12 of scintillator 11, and the photon reflected with the photon launched by scintillator 11 and optical module 14 carries out collecting and is passed to photocathode 121 place of photomultiplier 12.
Namely shielded cell 4 is sheathed on outside described scintillator 11, the shielded cell 4 of the present embodiment is made up of the stereotype that at least 2cm is thick, the radiation of environment can be played good barrier effect by this shielded cell 4, thus further ensures this raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector test accuracy in use.
More specifically, with reference to Fig. 3, the reflectance coating that optical module 14 is included on the sidewall of scintillator 11 that lamination is arranged successively and photomask. Wherein, the photon that scintillator 11 is launched can be reflected by reflectance coating, until the photon that scintillator 11 is launched all is passed to photon gathering member 15 place; Photomask then can radiation to external world produce block effect, in order to avoid the radiation delivery in the external world is in scintillator 11, thus the photon that scintillator 11 is launched is caused interference; Preferably, the material of reflectance coating can be minute surface tapetum lucidum or the diffusive reflective film being prepared into by materials such as magnesium oxide, and photomask is black, reduces the absorption of radiation to external world with maximum amplitude. In addition, the material of the photon gathering member 15 being arranged between scintillator 11 and photomultiplier 12 is preferably optics silicone oil, it can collect by the photon to the photon that scintillator 11 is launched and through reflectance coating reflection, until these photons pass through this photon gathering member 15 and are passed to photocathode 121 place of photomultiplier 12.
What deserves to be explained is, in the present embodiment, scintillator 11 is for being of a size of the cylindrical NaI:Tl crystal of �� 130mm (diameter) �� �� 130mm (highly), and described NaI:Tl crystal refers to the NaI crystal doped with Tl; And correspondingly, the diameter of photomultiplier 12 is also 130mm, spectral response scope is 300nm��650nm, bigger diameter makes the photomultiplier 12 can be completely relative with scintillator 11, thus ensure that the photon that scintillator 11 is launched arrives in photomultiplier 12 through photon gathering member 15, and without the need to need to again collect because photomultiplier 12 is not corresponding with the size of scintillator 11. Large-sized scintillator 11 of the present embodiment can effectively improve the test precision of this raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector, thus can this raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector of much slower test relative error and test lower limit.
The Signal Analysis System 2 of the present embodiment comprises linear amplifier 21 and multichannel pulse amplitude analyzer 22; Wherein, linear amplifier 21 amplifies for detector 1 detects the pulse signal of generation, and multichannel pulse amplitude analyzer 22 is for screening the signal amplified through linear amplifier 21, and produces the spectral information in 1024 roads.
Specifically, multichannel pulse amplitude analyzer 22 carries out communication by RS-485 interface and data handling system 3.
The data handling system 3 of the present embodiment comprises data acquisition module, data processing module and data display module (not shown); Wherein, data acquisition module is used for the spectral information in 1024 roads that acquired signal analytical system 2 produces, and the described spectral information collected is transported to data processing module; The described spectral information received is depicted as spectrum curve by data processing module, and is contrasted by typical curve built-in to this spectrum curve and data handling system 3, calculates the content trying to achieve potassium ion; The content of the potassium ion that data display module is tried to achieve for showing.
Described typical curve is determined according to the standard model measuring some known potassium contents; The method of calculation of the slope of described typical curve are:
K=(NT-NB)/C
Wherein, NTRepresent the pulsimeter digit rate of the standard model between 750 Dao Zhi 850 roads, NBRepresenting the pulsimeter digit rate of the background sample between 750 Dao Zhi 850 roads, C represents the content of potassium ion in standard model.
The raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector of the present invention is based on the natural radioactive isotope to potassium40The measurement of the Characteristic �� ray of K, realizes the mensuration to potassium content.40K, when decaying, can radiate the gamma-rays that energy is 1.46MeV. gamma-rays enters in scintillator 11, react with scintillator 11, make the atom in scintillator 11 and molecular ionization and excite, produce photon moving back in sharp process, these photons are collected on the photocathode 121 of photomultiplier 12, there is photovoltaic effect, photon turns into photoelectron, these photoelectrons are by the multiplication of photomultiplier 12, the final anode (not shown) in photomultiplier 12 obtains one several millivolts pulse signals to a few volt, again by prime amplifier 13, pulse signal is amplified, then by this pulse signal input signal analytical system 2. linear amplifier 21, multichannel pulse amplitude analyzer 22 etc. it is provided with in Signal Analysis System 2. the pulse signal of input is done further amplification by linear amplifier 21, then is screened by multichannel pulse amplitude analyzer 22, then exports in data handling system 3 by every counting together, treated obtains spectrum curve, as shown in Figure 4.
Main technical indicator and the performance of the raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector of the present invention are as follows:
(1) working temperature :-10 DEG C��50 DEG C, work humidity :��95%;
(2) 4 �� detection efficiencys: �� >=1.7% (137Cs);
(3) energy resolution: 7%��8%;
(4) energy region: 70keV��3MeV is detected;
(5) test specification: 3.7Bq/m3��3.7 �� 106Bq/m3;
(6) measurement sensitivity lower limit: 1% (by KCl mass percentage);
(7) relative error is tested :��3%.
Although illustrate and describing the present invention with reference to specific embodiment, but it should be appreciated by those skilled in the art that: when do not depart from by claim and etc. jljl limit the spirit and scope of the present invention, the various changes in form and details can be carried out at this.
Claims (10)
1. a raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector, comprising:
Detector, described detector is used for sampling detection online or immediately40The gamma-rays of the 1.46MeV of radiation when K decays, to generate pulse signal;
Signal Analysis System, described Signal Analysis System is for analyzing described pulse signal, and produces spectral information;
Data handling system, described data handling system gathers described spectral information, is depicted as spectrum curve and is contrasted by typical curve built-in to itself and described data handling system, calculates and shows the content of potassium ion; Described typical curve is the relation curve of the content of potassium ion in the pulsimeter digit rate of described raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector and potassium sample; It is characterized in that,
Described detector comprises:
Scintillator, described scintillator be used for the gamma-rays generation photovoltaic effect injected in it after produce photon;
Photomultiplier, described photomultiplier is for receiving described photon, and is described pulse signal by described photon conversion;
Prime amplifier, described prime amplifier is for amplifying described pulse signal;
Optical module, described optical module is arranged on the sidewall of described scintillator, to be reflected by described photon until described photon transfer is to described photon gathering member place;
And photon gathering member, described photon gathering member is arranged on the surface relative with described photomultiplier of described scintillator, with by through described scintillator emission and the described photon that reflects through described optical module carry out collecting and be passed to the photocathode place of described photomultiplier.
2. raw material potassium ore deposit according to claim 1 sodium iodide crystal Intelligence potassium detector, it is characterised in that, described optical module comprises the reflectance coating and photomask folded into successively on the sidewall being arranged on described scintillator.
3. raw material potassium ore deposit according to claim 2 sodium iodide crystal Intelligence potassium detector, it is characterised in that, the material of described photon gathering member is optics silicone oil.
4. raw material potassium ore deposit according to claim 1 sodium iodide crystal Intelligence potassium detector, it is characterised in that, the material of described scintillator is the NaI:Tl crystal of diameter 130mm, height 130mm.
5. raw material potassium ore deposit according to claim 4 sodium iodide crystal Intelligence potassium detector, it is characterised in that, the diameter of described photomultiplier is 130mm.
6. according to the arbitrary described raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector of claim 1-5, it is characterised in that, described raw material potassium ore deposit sodium iodide crystal Intelligence potassium detector also comprises: shielded cell; Described shielded cell is sheathed on outside described scintillator.
7. raw material potassium ore deposit according to claim 6 sodium iodide crystal Intelligence potassium detector, it is characterised in that, the material of described shielded cell is the stereotype that thickness is no less than 2cm.
8. raw material potassium ore deposit according to claim 1 sodium iodide crystal Intelligence potassium detector, it is characterised in that, described Signal Analysis System comprises linear amplifier and multichannel pulse amplitude analyzer; Described linear amplifier is for amplifying described pulse signal, and described multichannel pulse amplitude analyzer is for screening the pulse signal amplified through described linear amplifier, and produces the spectral information in 1024 roads;
Described data handling system comprises data acquisition module, data processing module and data display module; Described data acquisition module is for gathering described spectral information, and described spectral information is transported to described data processing module; Described spectral information is depicted as described spectrum curve by described data processing module, and is contrasted by typical curve built-in to described spectrum curve and described data handling system, calculates the content trying to achieve potassium ion; Described data display module is for showing the content of described potassium ion.
9. raw material potassium ore deposit according to claim 8 sodium iodide crystal Intelligence potassium detector, it is characterised in that, described multichannel pulse amplitude analyzer carries out communication by RS-485 interface and described data handling system.
10. raw material potassium ore deposit according to claim 1 sodium iodide crystal Intelligence potassium detector, it is characterised in that, described typical curve is determined according to the standard model of the content measuring some known potassium ions; The slope calculation formula of described typical curve represents:
K=(NT-NB)/C
Wherein, NTRepresent in the sodium iodide crystal Intelligence potassium detector of described raw material potassium ore deposit the pulsimeter digit rate of the standard model between 750 Dao Zhi 850 roads, NBRepresenting in the sodium iodide crystal Intelligence potassium detector of described raw material potassium ore deposit the pulsimeter digit rate of the background sample between 750 Dao Zhi 850 roads, C represents the content of potassium ion in standard model.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108008439A (en) * | 2016-10-28 | 2018-05-08 | 福建宁德核电有限公司 | A kind of nuclear power plant's water body radiation monitoring system |
| CN110780337A (en) * | 2018-07-31 | 2020-02-11 | 丹东东方测控技术股份有限公司 | Integrated star energy spectrum measuring system suitable for neutron activation analysis |
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