CN105629285A - Multifilament proportional counter - Google Patents
Multifilament proportional counter Download PDFInfo
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- CN105629285A CN105629285A CN201610035043.2A CN201610035043A CN105629285A CN 105629285 A CN105629285 A CN 105629285A CN 201610035043 A CN201610035043 A CN 201610035043A CN 105629285 A CN105629285 A CN 105629285A
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- proportional counter
- multiwire proportional
- multiwire
- upper cover
- pallet
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/1606—Measuring radiation intensity with other specified detectors not provided for in the other sub-groups of G01T1/16
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- Health & Medical Sciences (AREA)
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- Measurement Of Radiation (AREA)
Abstract
The invention relates to a multifilament proportional counter. The multifilament proportional counter is characterized in that an upper cover plate is disposed on a pedestal in a covered manner; a tray support is disposed on the upper part of the pedestal, and is combined with the pedestal; a tray is disposed on the upper part of the tray support, and is connected with the tray support; a cathode bottom plate is fixedly disposed on the upper cover plate; a connecting rod is fixedly disposed on the lower part of the cathode bottom plate; an anode filament rack is disposed on the lower part of the cathode bottom plate, and is hung on the connecting rod; and anode filaments are connected with the anode filament rack by springs. The multifilament proportional counter is advantageous in that the influence of the distance between the radioactive source and the anode filaments on the emissivity of the radioactive source surface and the uncertainty evaluation can be researched quantitatively, and the influence of the air pressure working condition on the beta ray detection can be researched quantitatively; the electric field distribution is stable, and can be used to keep the tray used for carrying the large-area source stable and unshaken, and by adopting the roller-type bearing design, the movable operation of the source tray can be realized.
Description
Technical field
The present invention relates to ionization gage measurement technique field, particularly relate to a kind of multiwire proportional counter.
Background technology
Proportional counter is that output pulse amplitude and initial ionization ion pair quantity have the particle detector of proportional relation as working media with gas, it is possible to for count particles number, and the pulse height according to output signal determines the energy that incoming particle deposits. Multiwire proportional counter is the proportional counter with multifilament structure, it is made up of a large amount of parallel filaments, all these filaments are all in two pieces of planes between the cathode plane of several centimetres, and the diameter of anode fine rule is about tens microns, is spaced about one or several millimeters. Every rhizoid all equally can work as proportional coumter, and spatial accuracy can be made to reach one millimeter or less. Every rhizoid can undertake high particle recording rate, may be up to hundreds of thousands per second.
Multiwire proportional counter of the prior art, there is problems in that
(1) cannot the quantitative study " radioactive source-anode wire distance " impact on surface particle emission rate;
(2) cannot the impact on beta-ray detection of the quantitative study pressure work condition;
(3) in life-time service process, owing to anode wire plane is paralleled with horizontal plane, therefore anode wire can change the distribution of chamber internal electric field under the impact of action of gravity, thus accuracy and long-time stability to emissivity realization bring adverse effect;
(4) the pallet instability carrying big surface source is easily rocked, and produces error thus causing measuring.
Summary of the invention
It is an object of the invention to provide a kind of multiwire proportional counter, to solve multiwire proportional counter Problems existing of the prior art.
For achieving the above object, the invention provides a kind of multiwire proportional counter, including: upper cover plate, base, anode wire, anode guide frame, negative electrode base plate, connecting rod, pallet and tray supporter;
Described upper cover plate covers on described base;
Described tray supporter, is positioned at above described base, combines with described base;
Described pallet, is positioned at above tray supporter, is connected with described tray supporter;
Described negative electrode base plate, is fixed on described upper cover plate;
Described connecting rod, is fixed on below described negative electrode base plate;
Described anode guide frame, is positioned at below described negative electrode base plate, and is articulated in described connecting rod;
Described anode wire, is connected with described anode guide frame by spring;
Radioactive source is placed on described pallet, working gas is passed in described multiwire proportional counter, described anode wire is energized, produce electric field, when the ray that described radioactive source discharges is by described working gas, gas molecule ionization produces electronics and cation, under described electric field action, described electronics drifts about to anode wire, described cation drifts about to negative electrode base plate and pallet, cation quality is more than electron mass, the electric field of drift bearing weakens, the direction electric field intensity of electron drift increases, electronics and gas molecule are ionized again, produce new cation and electronics, amplify thus forming electron avalanche, record pulses of radiation signal produced by this electron avalanche.
Further, described multiwire proportional counter also includes gear and gear shaft, is positioned at the groove on described base, described tray supporter and described base and utilizes described gear to combine.
Further, described multiwire proportional counter also includes right baffle-plate and right baffle plate, it is separately fixed at described base both sides, described pallet and the described tray supporter described multiwire proportional counter of spacing entrance by described right baffle-plate and right baffle plate or screws out from described multiwire proportional counter.
Further, described multiwire proportional counter also includes high pressure connection, gos deep into being connected with described anode wire in described multiwire proportional counter from the sidewall of described upper cover plate, and described high pressure connection is connected with external power source, provides high-tension electricity for described anode wire.
Further, described anode wire is multiple, and is equidistantly set in parallel on described anode guide frame.
Further, described pallet is connected by described spring screw with described tray supporter.
Further, described multiwire proportional counter also includes clamp, is arranged on the outer surface of described upper cover plate, described upper cover plate and described base is clamped.
Further, described multiwire proportional counter also includes rotation hand wheel, is connected with described gear shaft, and described pallet and described tray supporter pass in and out described multiwire proportional counter by described rotation hand wheel.
Further, described working gas is specially P10 gas.
Further, described multiwire proportional counter also includes barometer, fixes with described upper cover plate and is connected, monitors described multiwire proportional counter internal gas pressure value during work in real time.
The multiwire proportional counter that the embodiment of the present invention provides, can quantitative study " radioactive source-anode wire distance " on the impact of surface particle emission rate and uncertainty evaluation, can the impact on beta-ray detection of the quantitative study pressure work condition, Electric Field Distribution has stability, can ensure that the pallet of carrying big surface source does not stably rock, and it is equipped with roller type design bearing, it is achieved the movable operation of source pallet.
Accompanying drawing explanation
The profile of the multiwire proportional counter that Fig. 1 provides for the embodiment of the present invention;
The pallet of the multiwire proportional counter that Fig. 2 provides for the embodiment of the present invention and tray supporter profile;
The base plane figure of the multiwire proportional counter that Fig. 3 provides for the embodiment of the present invention.
Detailed description of the invention
Below by drawings and Examples, technical scheme is described in further detail.
The multiwire proportional counter housing that the embodiment of the present application provides is processed by aluminium alloy, the effective search coverage 340mm of chamber �� 150mm �� 50mm, for carrying large area ��, the tray area in �� plane source be 300mm �� 200mm, distance anode wire height adjustable. For detecting ��, the beta-particle number that big surface source is launched comprehensively, chamber adopts and designs without window, and namely measured source directly contacts with working gas P10, thus avoiding the fenestrated membrane absorption to low energy beta rays and alpha-particle.
The profile of the multiwire proportional counter that Fig. 1 provides for the embodiment of the present invention, as it is shown in figure 1, the multiwire proportional counter of the embodiment of the present invention includes: upper cover plate 1, base 8, anode wire 2, anode guide frame 3, negative electrode base plate 4, connecting rod 5, pallet 6 and tray supporter 7;
Upper cover plate 1 covers on base 8; Tray supporter 7, is positioned at above base 8, combines with base 8; Pallet 6, is positioned at above tray supporter 7, is connected with tray supporter 7; Negative electrode base plate 4, is fixed on upper cover plate 1; Connecting rod 5, is fixed on below negative electrode base plate 4; Anode guide frame 3, is positioned at below negative electrode base plate 4, and is articulated in connecting rod 5; Anode wire 2, is connected with anode guide frame 3 by spring.
During work, being placed in by radioactive source on pallet 6, will pass into working gas in multiwire proportional counter, antianode silk 2 is energized, when the ray of radioactive source release is by working gas, gas molecule ionization produces electronics and cation, and under electric field action, electronics drifts about to anode wire, cation drifts about to negative electrode base plate 4 and pallet 6, cation quality is big, and the electric field of drift bearing is by by force to weak, and therefore the acceleration of electric field is not enough so that itself and working gas generation ionizing collision; Electron drift is close to anode, and electric field intensity increases so that it is the energy of acquisition be enough to again with gas molecule generation ionizing collision, produce new cation and electronics. Circulate successively, the cloud,positive ion that cation is formed, owing to quality is too big, slowly to cathodic migration, this process can occur ionization process hardly again. And electron amount is continuously increased constantly, thus forming electron avalanche, record pulses of radiation signal produced by this electron avalanche.
Additionally, multiwire proportional counter also includes gear 13 and gear shaft 14, it is positioned at the groove on base 8, pallet 6 and base 8 and utilizes gear 13 to combine. Being additionally provided with rotation hand wheel 15 on gear shaft 14, pallet 6 rotates in and out multiwire proportional counter by rotation hand wheel 15.
Multiwire proportional counter also includes left baffle 17, is separately fixed at base 8 both sides, pallet 6 and the tray supporter 7 spacing entrance multiwire proportional counter by left baffle 17 or screws out from multiwire proportional counter.
Being additionally provided with high pressure connection 10 on the sidewall of upper cover plate 1, going deep into being connected with anode wire 2 in multiwire proportional counter from sidewall in one end of high pressure connection 10, the other end of high pressure connection 10 is connected with external power source, provides high-tension electricity for anode wire 2. The two side of upper cover plate 1 is also respectively provided with pore 9.
Optionally, upper cover plate 1 is provided above barometer, monitors housing internal gas pressure value during for work in real time.
Wherein, anode wire 2 is multiple, and is equidistantly set in parallel on anode guide frame.
In the present embodiment, the gold-plated tungsten wire that anode wire 2 adopts 10 diameters to be 20 microns, the equidistant parallel arrangement of silk spacing 2.5cm is on anode guide frame.
In the life-time service process of multiwire proportional counter, anode guide frame can produce deformation due to the change of the conditions such as stress, temperature and humidity, can cause time serious that the sagging quantitative change of anode wire is big, change the Electric Field Distribution in multiwire proportional counter, thus accuracy and long-time stability to emissivity realization bring adverse effect. In order to effectively control the distribution of anode wire internal tension, thus realizing stablizing of multiwire proportional counter internal electric field distribution, in the multiwire proportional counter that the embodiment of the present application provides, the termination of every anode wire is fixed on anode guide frame by spring, and thread tension is about 50g.
In addition, upper cover plate 1 is provided with active grab 18, the both sides of base 8 are provided with active grab hook 19, active grab 18 and active grab hook 19 support the use, for clamping upper cover plate 1 and base 8, also there is between upper cover plate 1 and base 8 rubber seal 16, be used for sealing, thus forming airtight cavity.
For Beta-ray measurement, owing to the �� ray ceiling capacity of variety classes �� decay nucleic is different, and power spectrum continuous distribution, its energy deposited in chamber is closely not identical yet. For high energy �� ray, in relatively lean working gas, sedimentary energy is less, if corresponding electric impulse signal amplitude arranges will form counting loss lower than threshold under electronics, so needing to work under of a relatively high air pressure; For low energy beta rays, can there is the scattering effect of stronger ray and working gas, it is necessary to work under relatively low air pressure. For the impact on beta-ray detection of the quantitative study pressure work condition, the multiwire proportional counter that the embodiment of the present application provides adopts clamp-type design at housing corner place, such that it is able to form an airtight cavity. Operating air pressure can be increased to 0.2MPa, i.e. 2 times of normal atmospheres. Meanwhile, by being equipped with vacuum-pumping system, low pressure working environment can be formed in chamber.
The pallet of the multiwire proportional counter that Fig. 2 provides for the embodiment of the present invention and tray supporter profile. As in figure 2 it is shown, be provided with spring screw 20 on pallet 6, pallet 6 is fixed on tray supporter 7 center by the four of corner spring screws, can adjust the height of pallet 6 and the levelness of pallet by regulating the degree of depth of four spring screws. Carrying ��, �� plane source pallet distance anode wire height adjustable, for the quantitative study " radioactive source-anode wire distance " impact on surface particle emission rate and uncertainty evaluation.
Being additionally provided with tooth bar 11 and rolling bearing 12 on tray supporter 7, tooth bar 11 matches with gear 13, and tray supporter 7 is pulled out from enumerator by gear 13 and tooth bar 11. Rolling bearing 12 is installed between tray supporter 7 and base 8, it is ensured that tray supporter 7 static and mobile time tray supporter 7 can be kept steadily not rock, and and be rolling friction between base 8, protection contact surface.
The base plane figure of the multiwire proportional counter that Fig. 3 provides for the embodiment of the present invention. As shown in Figure 3, base is provided with rach slot 21, gear grooved 23 and gear axial trough 22, gear grooved 23 is used for installing gear 13 (such as Fig. 1), and tooth bar 11 (such as Fig. 1) moves in rach slot 21, and gear axial trough 22 is used for installing gear shaft 15 (such as Fig. 1).
The multiwire proportional counter that the embodiment of the present application provides, core sensor as China 2 �� ��, 2 �� beta-particle emissivity radioactivity benchmark, to be used for reappearing large area ��, �� plane source surface particle emissivity value, for the fixed monitor of ��, �� surface contamination analyzer and place radiation protection, environmental pollution, medical and health, the nuclear power energy, Isotope production, reactor factory etc. radioactive pollution monitoring in field magnitude tracing guarantee is provided.
The multiwire proportional counter that the embodiment of the present invention provides, carrying ��, �� plane source pallet distance anode wire height adjustable, can quantitative study " radioactive source-anode wire distance " impact that radioactive source slin emissivity is measured and uncertainty evaluation; The termination of the internal every anode wire of enumerator adopts fixing spring design, and thread tension distribution is controlled and stable, so that the distribution of multiwire proportional counter internal electric field has stability; The corner place of enumerator adopts clamp-type design, form an airtight cavity, operating air pressure can be increased to 2 times of normal atmospheres, simultaneously, by being equipped with vacuum-pumping system, can forming low pressure working environment in chamber, chamber internal gas pressure value is monitored in real time by the barometer of housing upper, thus realizing the impact on beta-ray detection of the quantitative study pressure work condition; It is provided with between tray supporter and base and organizes rolling bearing more, it is possible to ensure that the pallet of carrying big surface source does not stably rock, and realize the rolling friction between tray supporter and base, thus protecting contact surface.
Above-described detailed description of the invention; the purpose of the present invention, technical scheme and beneficial effect have been further described; it is it should be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. a multiwire proportional counter, it is characterised in that described multiwire proportional counter includes: upper cover plate, base, anode wire, anode guide frame, negative electrode base plate, connecting rod, pallet and tray supporter;
Described upper cover plate covers on described base;
Described tray supporter, is positioned at above described base, combines with described base;
Described pallet, is positioned at above tray supporter, is connected with described tray supporter;
Described negative electrode base plate, is fixed on described upper cover plate;
Described connecting rod, is fixed on below described negative electrode base plate;
Described anode guide frame, is positioned at below described negative electrode base plate, and is articulated in described connecting rod;
Described anode wire, is connected with described anode guide frame by spring;
Radioactive source is placed on described pallet, working gas is passed in described multiwire proportional counter, described anode wire is energized, produce electric field, when the ray that described radioactive source discharges is by described working gas, gas molecule ionization produces electronics and cation, under described electric field action, described electronics drifts about to anode wire, described cation drifts about to negative electrode base plate and pallet, cation quality is more than electron mass, the electric field of drift bearing weakens, the direction electric field intensity of electron drift increases, electronics and gas molecule are ionized again, produce new cation and electronics, amplify thus forming electron avalanche, record pulses of radiation signal produced by this electron avalanche.
2. multiwire proportional counter according to claim 1, it is characterised in that described multiwire proportional counter also includes gear and gear shaft, is positioned at the groove on described base, described tray supporter and described base and utilizes described gear to combine.
3. multiwire proportional counter according to claim 1, it is characterized in that, described multiwire proportional counter also includes right baffle-plate and right baffle plate, it is separately fixed at described base both sides, described pallet and the described tray supporter described multiwire proportional counter of spacing entrance by described right baffle-plate and right baffle plate or screws out from described multiwire proportional counter.
4. multiwire proportional counter according to claim 1, it is characterized in that, described multiwire proportional counter also includes high pressure connection, go deep into being connected with described anode wire in described multiwire proportional counter from the sidewall of described upper cover plate, described high pressure connection is connected with external power source, provides high-tension electricity for described anode wire.
5. multiwire proportional counter according to claim 1, it is characterised in that described anode wire is multiple, and be equidistantly set in parallel on described anode guide frame.
6. multiwire proportional counter according to claim 1, it is characterised in that described pallet is connected by described spring screw with described tray supporter.
7. multiwire proportional counter according to claim 1, it is characterised in that described multiwire proportional counter also includes clamp, is arranged on the outer surface of described upper cover plate, described upper cover plate and described base is clamped.
8. multiwire proportional counter according to claim 1, it is characterized in that, described multiwire proportional counter also includes rotation hand wheel, is connected with described gear shaft, and described pallet and described tray supporter pass in and out described multiwire proportional counter by described rotation hand wheel.
9. multiwire proportional counter according to claim 1, it is characterised in that described working gas is specially P10 gas.
10. multiwire proportional counter according to claim 1, it is characterised in that described multiwire proportional counter also includes barometer, fixes with described upper cover plate and is connected, monitor described multiwire proportional counter internal gas pressure value during work in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610035043.2A CN105629285B (en) | 2016-01-19 | 2016-01-19 | A kind of multiwire proportional counter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610035043.2A CN105629285B (en) | 2016-01-19 | 2016-01-19 | A kind of multiwire proportional counter |
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| Publication Number | Publication Date |
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| CN105629285A true CN105629285A (en) | 2016-06-01 |
| CN105629285B CN105629285B (en) | 2018-05-18 |
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| CN201610035043.2A Expired - Fee Related CN105629285B (en) | 2016-01-19 | 2016-01-19 | A kind of multiwire proportional counter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106772536A (en) * | 2017-03-02 | 2017-05-31 | 中国原子能科学研究院 | Wide-range tissue-equivalent proportional counter and its application |
| CN109991137A (en) * | 2019-04-02 | 2019-07-09 | 霸州市地海云天环保科技有限公司 | Small ion collection type monitoring device of powder-like waste based on αsource |
| CN112041703A (en) * | 2018-04-26 | 2020-12-04 | 三菱综合材料株式会社 | Alpha ray measuring apparatus |
| CN112068183A (en) * | 2020-09-15 | 2020-12-11 | 中国核动力研究设计院 | 4 pi multi-filament proportional chamber for 4 pi beta-gamma coincidence measurement |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106772536A (en) * | 2017-03-02 | 2017-05-31 | 中国原子能科学研究院 | Wide-range tissue-equivalent proportional counter and its application |
| CN106772536B (en) * | 2017-03-02 | 2019-03-12 | 中国原子能科学研究院 | Wide-range tissue-equivalent proportional counter and its application |
| CN112041703A (en) * | 2018-04-26 | 2020-12-04 | 三菱综合材料株式会社 | Alpha ray measuring apparatus |
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| CN109991137A (en) * | 2019-04-02 | 2019-07-09 | 霸州市地海云天环保科技有限公司 | Small ion collection type monitoring device of powder-like waste based on αsource |
| CN112068183A (en) * | 2020-09-15 | 2020-12-11 | 中国核动力研究设计院 | 4 pi multi-filament proportional chamber for 4 pi beta-gamma coincidence measurement |
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|---|---|
| CN105629285B (en) | 2018-05-18 |
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