CN2869885Y - Composite proportional counter-tube detector - Google Patents
Composite proportional counter-tube detector Download PDFInfo
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- CN2869885Y CN2869885Y CN 200520130926 CN200520130926U CN2869885Y CN 2869885 Y CN2869885 Y CN 2869885Y CN 200520130926 CN200520130926 CN 200520130926 CN 200520130926 U CN200520130926 U CN 200520130926U CN 2869885 Y CN2869885 Y CN 2869885Y
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- counter tube
- compound
- proportional counter
- ray
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Abstract
A multiple proportion counter tube detector is characterized in that multiple proportion counter tube is used as the ray detecting part, the shift from pulse charge to pulse amplitude is performed by charge sensitive amplifier and linear amplifier, ray coincidence and anti-coincidence measuring technique is adopted to reduce the background of ray spectrum, data is collected by multi-channel pulse amplitude analyzer and processed by host computer. The purpose of invention is to measure the weak information in the strong background spectrum. The utility model ensures the electric field strength of cylinder type proportion counter tube while the utility model adopts multiple structural counter tube detecting ray, the ray coincidence and anti-coincidence measuring technique and balance filter technique are adopted to reduce the background of ray spectrum and improve the precision and sensitivity of weak signal measurement, and enlarge the application of energy chromatic dispersion analysis method.
Description
(1) technical field:
The utility model relates to radiation detection technology and radiation detector, particularly a kind of radiation detector that contains compound proportional counter tube.
(2) background technology:
In the radiation detector technology, gas detector is to be applied the earliest and one of the type that develops.And in many gas detectors, the proportional counter tube detector has detected ray intensity and the function of differentiating ray energy simultaneously, gives the notion of " direct ratio " and represents that promptly the energy of detector output pulse amplitude and incident ray has good linear relationship.Therefore it is widely used in the ray energy analysis.
Be used for the proportional counter tube detector that ray energy is analyzed, wish that it has best energy resolution.But, because the free electron that existence can't overcome and the randomness of gas molecule ionizing collision, and can manage to eliminate and the influence of the elimination various factors do not accomplished (such as free electron by the capturing of neutral electronegative gas molecule, the fluctuation of high-voltage power supply, the anodic wire thickness is inhomogeneous, smooth finish is not high, sagging and end effect etc.), make proportional counter tube detector energy resolution not satisfactory.Theoretical calculation, its end-point energy resolution to MnK α X ray about 15%.The actual proportional counter tube detector energy resolution of using have up to 20%.
Therefore, even survey the tailored radiation line, its detector output pulse amplitude also can not be lower than the fluctuation of theoretical calculation, this normal fluctuation Gaussian distributed.As seen, when surveying the ray of many group energy, the pulse height of detector output is the stack spectral of some Gaussian distribution.The existence of the scattering spectra of different-energy in addition, the pulse height that finally detects distribute quite complicated, and still to height that can't the spectrum unscrambling analysing energy, even separate analysis of spectrum, its accuracy is also very low.This is the weak point of proportional counter tube detector, can't analyze the radiant rays of the adjacent or multipotency of two energy.
The proportional counter tube detector of cylinder type has best uniform electric field and distributes.Can describe by following formula:
E
r＝V
0/r·ln(b/a)
Wherein, a is an axis anodic wire radius, and b is a cylinder negative electrode inside radius, V
0Be the voltage that counter tube applies, E
rBe the electric field intensity of ordering apart from anodic wire r.At E
rUnder the electric field action, when free electron radially drifted about, more near anode, the energy that the unit distance obtains was many more, and the probability that produces impact ionization is high more, and gas amplifies will concentrate near the formation of anodic wire.If want to make a high resolving power proportional counter tube detector, the structural design of proportional counter tube and process Installation are very important.
When the proportional counter tube detector is applied in x-ray fluorescence analysis, if excite with the X-ray pipe, adopt the energy dispersion analysis (EDA) method, its detector pulse output always has very strong scattering background, influences the analysis precision and the sensitivity of element to be analyzed.How to reduce or eliminate a great problem that scattering background also is the proportional counter tube detector.In a word, the proportional counter tube detector is used for the difficult problem that the ray energy analysis still exists needs to solve.
(3) summary of the invention:
The purpose of this utility model is to design a kind of compound proportional counter tube detector, it adopts double anode common cathode cylinder type proportional counter tube structure, this detector keeps the equally distributed characteristics of cylinder type proportional counter tube electric field intensity, export the ionization electric weight respectively by double anode, be used for to ray meet, anticoincidence measurement or be used in weak signal measurement under the big scattering background, be to have not yet to see the proportional counter tube detector of using.
The technical solution of the utility model: a kind of compound proportional counter tube detector is characterized in that: it is done the sensitive detection parts of radiant rays by compound proportional counter tube; The counter tube high pressure is powered by high pressure distributor; Finish of the conversion of the pulse quantity of electric charge by charge amplifier, linear moulding amplifier to pulse height; Adopt that ray meets, the anticoincidence measurement circuit to be to reduce the background of alpha spectrum to be measured; By the multichannel pulse scope-analyzer image data, and by host computer processing, analysis data.
Above-mentioned said compound proportional counter tube is made up of X-ray detection X pipe and compound coincidence tube, between two pipes by the butt joint of compound window, compound window be the ray outlet of sound-pipe be again the multiple tube incidence window; Two Guan Junyong cylinder type negative electrodes, its anodic wire is parallel, and spacing is got cylinder negative electrode internal diameter or a kind of smaller or equal among the 200 μ m; The ionization electric weight in space under each anode is independently exported.
The compound window of above-mentioned said compound proportional counter tube has the balanced-filter function, will be according to the man-to-man design of the ray energy of being surveyed, making.
Above-mentioned said charge amplifier is made up of 3DJ, 2N4 series structure field effect transistor and TLE series, LM series, LF series, LH series, AD and OP series low noise, high input impedance, wideband patch formula operational amplifier.
Above-mentioned said linear moulding amplifier is made up of LF411-412, TLE2071-2072, LM6165, LF157/257/357 and the SMD operational amplifier of OP-64 class, Gain Automatic adjusting, output pulse width≤2 μ s.
Above-mentioned said meet with anticoincidence measurement by meet, anticoincidence circuit, delay circuit and screen output circuit and finish the screening that meets, conversion is gathered in the pulse that realizes only treating analytical element and produced; The both available wattless component of coincidence circuit realizes that also available meritorious paster is realized.
Above-mentioned said counter tube high pressure is powered by high pressure distributor, and high pressure distributor is controlled by high-voltage control circuit, and the high voltage control data depend on predefined pulse height, makes counter tube be stabilized in work in the proportional region.
The above-mentioned said multichannel pulse scope-analyzer image data of selecting for use, its ADC converter unit are subjected to the control of anticoincidence circuit output.
Above-mentioned said compound proportional counter tube detector both can adopt the inflation mode to work, and also can adopt the gas mode to work, when adopting the gas mode to work, and configuration flow gas proportional counter tube gas density watch-dog.
The principle of work of the present utility model and the course of work: be to utilize ion pair after ray and ionisation of gas effect and the ionization under electric field action, to form the rule of ionization current, choose the direct ratio workspace and make compound proportional counter tube detector.
Above-mentioned radionetric survey technology is by novel compound proportional counter tube detector detected ray; The background value that employing meets, anticoincidence technique reduces useful information; Select the multichannel pulse scope-analyzer image data for use; Handle, analyze data by host computer by means of software, provide transmitted intensity to be analyzed and energy values.
The X-ray detection X device of above-mentioned compound proportional counter tube detector is the compound proportional counter tube of innovative design.Compound proportional counter tube under same cathode environment, installs two parallel anodic wires based on cylinder type proportional counter tube electric-field intensity distribution, and the anodic wire spacing is selected two optimum distances, and the one, cathode cylinder internal diameter, the 2nd ,≤200 μ m.The double anode silk is independently exported the ionization current of ionization space separately.Cylinder negative electrode radius b and anodic wire radius a should satisfy b＞＞condition of a.Size Selection will be by ray type of surveying and energy decision more specifically.
The outgoing window that above-mentioned compound window is a sound-pipe is again the incidence window of coincidence tube, and its physical function is finished specific filter action.When incident ray produces ionization simultaneously in two proportional counter tubes, its anode will produce the pulse of free association simultaneously; If incident ray is absorbed when not entering coincidence tube by compound window, only pulse output is arranged at sound-pipe.
Above-mentioned compound proportional counter tube probe designs have meet, anticoincidence circuit and the examination output circuit that is mated.When sound-pipe and coincidence tube have pulse signal input coincidence circuit, coincidence circuit output meets signal, this signal comprises true coincidence signal (two counter tubes free related pulse) and meets signal (no pulse time correlation meets signal owing to coincidence circuit causes resolving time) they enter anticoincidence circuit simultaneously accidentally.When sound-pipe being exported pulse daley Δ t
1Time is regulated time Δ t when also importing anticoincidence circuit
1, in anticoincidence circuit, the pulse free related with the true coincidence signal will make anticoincidence circuit not have information output; Do not make signal of anticoincidence circuit output and have the pulse meeting of time correlation with the true coincidence signal, this signal is delivered to the ADC converter unit of multichannel analyzer and is opened the ADC conversion.Again the pulse daley Δ t of sound-pipe output
2Time is delivered to ADC, promptly realizes the control change to sound-pipe output pulse.
The resolution of above-mentioned two-way detector should be as far as possible little, otherwise when high count rate, meet accidentally and can fall into oblivion true coincidence.This all has the strict time requirement to each parts of detector system.
Superiority of the present utility model is: 1, this detector is a compound proportional counter tube detector that ray energy, intensity are detected simultaneously, is suitable for surveying X, γ, β ray; 2, the X-ray detection X device of this detector adopts the compound proportional counter tube of innovative design, the compound window of removable filter action is installed between two proportional counter tubes, it be particularly suitable for to ray meet, anticoincidence measurement, its detection system resolving time is between 10
-8-10
-7Second; 3, this probe designs have meet, anticoincidence circuit and delay meet control circuit, the simultaneous events that enters compound proportional counter tube is done meet, anticoincidence handles, and only selects useful incident to write down and analyze; 4, this detector adopts the multichannel pulse scope-analyzer image data, and its ADC transducer is accepted the anticoincidence signal controlling, gathers the alpha spectrum of low background; 5, the pulse height and the ray energy of the output of this detector have good linear relationship; 6, this detector both can be selected the inflatable working method, also can select the flow gas working method, when adopting the flow gas working method, was equipped with by " flow gas proportional counter tube gas density watch-dog ", guaranteed that Gas Amplification Multiple is stable.
(4) description of drawings:
Accompanying drawing is the compound proportional counter tube detector theory diagram of the related a kind of compound proportional counter tube of the utility model.
(5) embodiment:
Embodiment: a kind of compound proportional counter tube detector (seeing accompanying drawing) is characterized in that: it is done the sensitive detection parts of radiant rays by compound proportional counter tube; Finish of the conversion of the pulse quantity of electric charge by charge amplifier, linear moulding amplifier to pulse height; Adopt the meeting of ray, background that the anticoincidence measurement technology reduces alpha spectrum to be measured; By the multichannel pulse scope-analyzer image data, and by host computer processing, analysis data.
Above-mentioned said compound proportional counter tube is made up of X-ray detection X pipe and compound coincidence tube, between two pipes by the butt joint of compound window, compound window be the ray outlet of sound-pipe be again the coincidence tube incidence window; Two Guan Junyong cylinder type negative electrodes, its anodic wire is parallel, and spacing is got cylinder negative electrode internal diameter or a kind of smaller or equal among the 200 μ m; The ionization electric weight in space under each anode is independently exported.
The compound window of above-mentioned said compound proportional counter tube has the balanced-filter function, can be according to the man-to-man design of the ray energy of being surveyed, making.
Above-mentioned said charge amplifier is made up of 3DJ, 2N4 series structure field effect transistor and TLE series, LM series, LF series, LH series, AD and OP series low noise, high input impedance, wideband patch formula operational amplifier.
Above-mentioned said linear moulding amplifier is made up of LF411-412, TLE2071-2072, LM6165, LF157/257/357 and the SMD operational amplifier of OP-64 class, Gain Automatic adjusting, output pulse wide≤2 μ s.
Above-mentioned said by meet, anticoincidence circuit, delay circuit and screen the screening that output circuit is finished true coincidence, conversion is gathered in the pulse that realizes only treating analytical element and produced; The both available wattless component of coincidence circuit realizes that also available meritorious paster is realized.
Above-mentioned said counter tube high-voltage power supply is powered by high pressure distributor, and high pressure distributor is controlled by high-voltage control circuit, and the high voltage control data depend on predefined pulse height, makes counter tube be stabilized in work in the proportional region.
The above-mentioned said multichannel pulse scope-analyzer image data of selecting for use, its ADC converter unit are subjected to the information Control of anticoincidence circuit output.
Above-mentioned said compound proportional counter tube detector both can adopt the inflation mode to work, and also can adopt the gas mode to work, when adopting the gas mode to work, and configuration flow gas proportional counter tube gas density watch-dog.
The X-ray detection X flow process of the compound proportional counter tube detector of utility model following (seeing accompanying drawing):
The sound-pipe that radiographic source ray 4. passes detector 1. window enters sound-pipe, wherein the ray of high-energy part passes through compound window and enters coincidence tube 2., the ray that enters two pipes simultaneously will make two detector outputs free related, but the pulse signal that amplitude is slightly variant, 5. two signals enter coincidence circuit simultaneously, and 5. coincidence circuit is exported and met signal (true coincidence signal with accidental meet signal) and deliver to anticoincidence circuit 6..Because the detector output pulse signal has certain width, coincidence circuit has certain resolving time again, and therefore, two detectors output pulse is even without time correlation, also can produce to meet accidentally to export and deliver to anticoincidence circuit, and chance meets the probability of signal and the counting rate of two detectors is directly proportional.
The delayed Δ t of the pulse signal that 1. sound-pipe is exported
16. time deliver to anticoincidence circuit, and 6. realize anticoincidence with the signal that meets that 5. coincidence circuit is exported at anticoincidence circuit.The 6. no signal output of corresponding free related pulse anticoincidence circuit; 6. the pulse anticoincidence circuit of corresponding no time correlation exports an anticoincidence signal, starts the ADC conversion.3. the counter tube high pressure provides the operating voltage of two proportional counter tubes through divider, 8. the stable of high pressure controlled by high-voltage control circuit.The parameter of control is taken to the peak position of multichannel analyzer FeK α.The data that 7. multichannel analyzer is gathered are served a machine processing.
Design analysis of sulfur content instrument in the socle oil product.Sulfur content need be controlled at tens below the ppm in the product oil.When adopting the energy dispersion method to detect, so the characteristic curve of low content sulphur is placed in the very strong scattering background spectrum.Instrumental sensitivity and precision all difficulty reach requirement.Adopt the compound proportional counter tube detector of utility model of the present invention to detect, eliminate background spectra and disturb, promoted the sensitivity and the precision that adopt energy dispersion method detecting instrument.
The both available emitting isotope Fe-55 of the radiographic source of present embodiment lower energy photon source excitation testing sample also can excite with the X-ray pipe.X ray to be measured is the characteristic X-ray of element sulphur and the scattering spectra of excitaton source.The characteristic X-ray average energy 2.307KeV of sulphur, air is to the desirable 404.2 (cm of its mass attenuation coefficient
2/ g); P
10Gas is to the desirable 384.4 (cm of its mass absorption coefficient
2/ g).
The compound proportional counter tube detector anodic wire spacing 3-4cm of present embodiment, pipe range 10-11cm, the sound-pipe entrance window is by the organic film sealing-in of aluminizing.Compound window is by the polytetrafluoroethylene film press seal.Compound window less than 0.1 ‰, guarantees that coincidence tube does not write down the SK alpha ray to SK alpha ray penetrance.
Be designed for the analyser of adjacent element.In many production runes, need to analyze silicon, aluminium element content.Because proportional counter tube detector energy resolution is not high in the energy dispersion method, the K α characteristic curve of silicon, aluminium element is superposed to a distribution of pulses spectrum.Adopt compound proportional counter tube detector, the filter action that utilizes compound window in conjunction with meet, the anticoincidence measurement technology can obtain characteristic spectrum separately, promptly, can obtain SiK α spectrum with the ADC conversion that information is opened multichannel analyzer that meets of sound-pipe and coincidence tube output; Open the ADC conversion by their anticoincidence information and can obtain AlK α spectrum.
Be used for the compound proportional counter tube detector that adjacent element is analyzed, two anodic wire spacings are controlled at about 200 μ m, and the negative electrode internal diameter is about 2.5cm.Compound window is one group of aluminium-silicon balanced-filter for SiK α characteristic X-ray.Adopt the pulse height of two multichannel pulse scope-analyzer record sound-pipes and complex pipe to distribute.
Analysis of sulfur content instrument or be used for the meeting of analyser, the anticoincidence circuit of adjacent element in the designed petroleum products, delay control circuit all should design according to sound-pipe and multiple tube output pulse amplitude characteristic.
Claims (9)
1, a kind of compound proportional counter tube detector, it is characterized in that: it is done the sensitive detection parts of radiant rays by compound proportional counter tube; The counter tube high pressure is powered by high pressure distributor; Finish of the conversion of the pulse quantity of electric charge by charge amplifier, linear moulding amplifier to pulse height; Adopt that ray meets, the anticoincidence measurement circuit to be to reduce the background of alpha spectrum to be measured; By the multichannel pulse scope-analyzer image data, and by host computer processing, analysis data.
2, compound proportional counter tube detector according to claim 1, it is characterized in that: said compound proportional counter tube is made up of X-ray detection X pipe and compound coincidence tube, between two pipes by the butt joint of compound window, compound window be the ray outlet of sound-pipe be again the multiple tube incidence window; Two Guan Junyong cylinder type negative electrodes, its anodic wire is parallel, and spacing is got cylinder negative electrode internal diameter or a kind of smaller or equal among the 200 μ m; The ionization electric weight in space under each anode is independently exported.
3, compound proportional counter tube detector according to claim 2, it is characterized in that: the compound window of said compound proportional counter tube has the balanced-filter function, will be according to the man-to-man design of the ray energy of being surveyed, making.
4, compound proportional counter tube detector according to claim 1 is characterized in that: said charge amplifier is made up of 3DJ, 2N4 series structure field effect transistor and TLE series, LM series, LF series, LH series, AD and OP series low noise, high input impedance, wideband patch formula operational amplifier.
5, compound proportional counter tube detector according to claim 1, it is characterized in that: said linear moulding amplifier is made up of LF411-412, TLE2071-2072, LM6165, LF157/257/357 and the SMD operational amplifier of OP-64 class, Gain Automatic adjusting, output pulse width≤2 μ s.
6, compound proportional counter tube detector according to claim 1, it is characterized in that: said meet with anticoincidence measurement by meet, anticoincidence circuit, delay circuit and screen output circuit and finish the screening that meets, conversion is gathered in the pulse that realizes only treating analytical element and produced; The both available wattless component of coincidence circuit realizes that also available meritorious paster is realized.
7, compound proportional counter tube detector according to claim 1, it is characterized in that: said counter tube high pressure is powered by high pressure distributor, high pressure distributor is controlled by high-voltage control circuit, the high voltage control data depend on predefined pulse height, make counter tube be stabilized in work in the proportional region.
8, compound proportional counter tube detector according to claim 1 is characterized in that: the said multichannel pulse scope-analyzer image data of selecting for use, its ADC converter unit are subjected to the control of anticoincidence circuit output.
9, compound proportional counter tube detector according to claim 1 is characterized in that: said compound proportional counter tube detector both can be worked for the inflation mode, also can work for the gas mode; When adopting the gas mode to work, configuration flow gas proportional counter tube gas density watch-dog.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520130926 CN2869885Y (en) | 2005-12-27 | 2005-12-27 | Composite proportional counter-tube detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520130926 CN2869885Y (en) | 2005-12-27 | 2005-12-27 | Composite proportional counter-tube detector |
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| CN2869885Y true CN2869885Y (en) | 2007-02-14 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308935A (en) * | 2013-05-16 | 2013-09-18 | 中国原子能科学研究院 | Electronics system of portable low-power-consumption tissue-equivalent proportional counter |
| CN104536031A (en) * | 2014-12-26 | 2015-04-22 | 北京放射性核素实验室 | Trace radioactive gas nuclide activity measuring method and device |
| CN109358358A (en) * | 2018-09-10 | 2019-02-19 | 中国原子能科学研究院 | A kind of cylinder internal gas proportional counter |
| CN109493984A (en) * | 2018-11-09 | 2019-03-19 | 中国核动力研究设计院 | A kind of Nuclear Plant breakage on-line measuring device |
-
2005
- 2005-12-27 CN CN 200520130926 patent/CN2869885Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308935A (en) * | 2013-05-16 | 2013-09-18 | 中国原子能科学研究院 | Electronics system of portable low-power-consumption tissue-equivalent proportional counter |
| CN103308935B (en) * | 2013-05-16 | 2015-12-02 | 中国原子能科学研究院 | The electronic system of portable low power-consumption tissue-equivalent proportional counter |
| CN104536031A (en) * | 2014-12-26 | 2015-04-22 | 北京放射性核素实验室 | Trace radioactive gas nuclide activity measuring method and device |
| CN109358358A (en) * | 2018-09-10 | 2019-02-19 | 中国原子能科学研究院 | A kind of cylinder internal gas proportional counter |
| CN109493984A (en) * | 2018-11-09 | 2019-03-19 | 中国核动力研究设计院 | A kind of Nuclear Plant breakage on-line measuring device |
| CN109493984B (en) * | 2018-11-09 | 2022-03-01 | 中国核动力研究设计院 | Nuclear power station fuel assembly damage on-line measuring device |
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Addressee: Lu Feng Document name: Notification to Pay the Fees |
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Granted publication date: 20070214 Termination date: 20100127 |