CN203849420U - 2 [pi] multi-wire gasflow proportional counter - Google Patents
2 [pi] multi-wire gasflow proportional counter Download PDFInfo
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- CN203849420U CN203849420U CN201420199449.0U CN201420199449U CN203849420U CN 203849420 U CN203849420 U CN 203849420U CN 201420199449 U CN201420199449 U CN 201420199449U CN 203849420 U CN203849420 U CN 203849420U
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- counter
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- drawer
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Abstract
The utility model belongs to the dosage measuring technical field, and discloses a 2 [pi] multi-wire gasflow proportional counter in a flat and drawer type structure; the counter mainly comprises a counter housing and anode wires, an anode wire rack, insulation frames and a source drawer; the counter housing is a square frame formed by an upper cover plate and a housing side wall; the source drawer enters and withdraws from the counter housing through a guide rail; the housing side wall is respectively provided with an air inlet and an air outlet; the anode rack is a square frame and positioned between an upper insulation frame and a lower insulation frame, wherein the lower insulation frame is fixed on the housing side wall, the upper insulation frame is positioned below the upper cover plate, an upper edge of the housing side wall is provided with a sealing ring, and the upper cover plate is fixedly connected with the housing side wall; the anode wires are fixed on the anode wire rack, and are gild tungsten wires parallelly arranged at equal intervals; the counter has effective detection area of 1000 cm2, highly parallelly arranged anode wires, small gas disturbance, and uniform field distribution.
Description
Technical field
The utility model belongs to dosage measurement technical field, is specifically related to a kind of 2 π multifibres flow-gas proportional counters.
Background technology
The useful detection area of the existing surface contamination analyzer for places such as nuclear accident, the eliminations of nuclear facilities is all greater than 150cm
2, have even up to 1000cm
2.For this type of α, β surface contamination analyzer are carried out to scale or periodic calibration, conventionally select 2 π multifibres flow-gas proportional counters to measure the slin emissivity of large area α, β standard source.
2 general π multifibres flow-gas proportional counters have cylindric and plate two kinds both at home and abroad, the anode of its Counter mostly is filament, the design of negative electrode has polytype, as Chinese Academy of Sciences's biophysics in one's power the proportional counter of China Engineering Physics Research Institute design by two proportional counters with cathode and anode respectively, formed, form anticoincidence formula; The negative electrode of the design 8600A of U.S. ORDELA company money proportional counter is wire netting trellis.
Because the useful detection area of 2 π multifibres flow-gas proportional counters is crossed conference and is had between the inconsistent and anodic wire of the stretching tension force of anode metal silk that the not parallel electric field causing is inhomogeneous, poor stability, slin emissivity measure inaccurate problem.Therefore, the useful detection area maximum of existing 2 π multifibres flow-gas proportional counters is about 600～700cm at present
2, can not effectively meet in on-the-spot Radiation monitoring and the elimination of nuclear facilities active area is reached to 1000cm
2large area α, the accurate definite value of β plane source slin emissivity.
Utility model content
(1) utility model object
According to the existing problem of prior art, the utility model provides a kind of useful detection area up to 1000cm
2, the parallel distribution of anodic wire height, gas disturbance is little and the uniform 2 π multifibres flow-gas proportional counters of Electric Field Distribution.
(2) technical scheme
In order to solve the existing problem of prior art, the utility model is achieved through the following technical solutions:
2 π multifibres flow-gas proportional counters, this proportional counter is plate, drawer-type structure, it is mainly comprised of counter shell and the anodic wire, anode guide frame, Insulating frame and the source drawer that are positioned at counter enclosure; Described counter shell is the square framework being comprised of upper cover plate and housing sidewall, and wherein the one side of housing sidewall is placed source drawer, the integral structure that other three faces are comprised of side plate; Source drawer passes in and out counter shell by guide rail; On two side plates of the relative direction of housing sidewall, be respectively equipped with air intake opening and gas outlet, wherein in air intake opening, be provided with draft tube, the surrounding of draft tube is evenly distributed with gas port, and working gas enters by draft tube and is full of enclosure interior; Described anode guide frame is a square framework, they are between upper and lower two Insulating frames, wherein the Insulating frame of below is fixed in housing sidewall, the Insulating frame of top is positioned at the below of upper cover plate, anode guide frame, Insulating frame and upper cover plate be parallel placement all, the upper edge of housing sidewall is along being provided with O-ring seal, and upper cover plate is fixedly connected with housing sidewall; Anodic wire is fixed on anode guide frame, and wherein the arrangement mode of anodic wire is equidistant, parallel arrangement.
Preferably, described anodic wire is gold-plated tungsten wire, and its diameter is 25～30 μ m, and spacing is 10～20mm.
Preferably, the distance of described anodic wire distance sources drawer is 35～40mm, and anodic wire is 10～20mm apart from the distance of upper cover plate.
Preferably, described anodic wire is welded on anode guide frame by the mode of spot welding; During welding, first a point of anodic wire is welded on anodic wire frame, then utilizes the gauge block of a constant weight by another captacula tension, exceptionally straight of anodic wire, then its point is welded on anodic wire frame.
Preferably, in described housing sidewall, be also provided with high voltage standard joint and Signal connector.
Preferably, between described source drawer and counter housing, by O-ring seal, seal.
(3) beneficial effect
The 2 π multifibres flow-gas proportional counters that adopt the utility model to provide, this counter at useful area up to 1000cm
2situation under, can effectively meet that anodic wire height is parallel, plateau characteristic good, gas disturbance is little, electric field evenly and stable, this be mainly due to:
(1) adopting diameter is that the anodic wire of 25～30 μ m is as gold-plated tungsten wire, and the spacing that makes anodic wire is 10～20mm, make counter internal electric field more even, reduced edge effect as far as possible, guaranteed that the sensitive area between every anodic wire can link up and not occur low.
(2) adopted special spot welding cloth silk technology, first a point of anodic wire has been welded on anodic wire frame, then utilized the gauge block of a constant weight by another captacula tension, exceptionally straight of anodic wire, then its point is welded on anodic wire frame.This kind of cloth silk technology makes the anodic wire can be in state exceptionally straight, tension in the situation that reaching 50cm, and the uniform tension in order of every rhizoid, and guaranteeing can be highly parallel between anodic wire, completely in the same plane.
(3) air intake opening indoor design with the draft tube of gas port, make P-10 working gas by the gas port in draft tube, be penetrated into equably in the chamber of whole counter, avoided large strand of flow perturbation anodic wire and the electric field signal that causes is unstable.
Accompanying drawing explanation
Fig. 1 is 2 π multifibres flow-gas proportional counter structural representations;
Wherein 1 is air intake opening; The 2nd, sealing bolt; The 3rd, high pressure connection; The 4th, upper cover plate; The 5th, O-ring seal; The 6th, drawer panel; The 7th, source drawer; The 8th, anodic wire; The 9th, draft tube; The 10th, top Insulating frame; The 11st, anode guide frame; The 12nd, housing sidewall; The 13rd, gas outlet; The 14th, Signal connector;
Fig. 2 is draft tube sectional view;
Wherein 15 is gas ports.
Embodiment
Below in conjunction with embodiment and Figure of description, the utility model is further elaborated.
Embodiment 1
2 π multifibres flow-gas proportional counters, as shown in Figure 1, this proportional counter is plate, drawer-type structure, it is mainly comprised of counter shell and the anodic wire 8, anode guide frame 11, Insulating frame and the source drawer 7 that are positioned at counter enclosure; Described counter shell is the square framework being comprised of upper cover plate 4 and housing sidewall 12, and wherein the one side of housing sidewall 12 is placed source drawer 7, the integral structure that other three faces are comprised of side plate; Source drawer 7 passes in and out counter shell by guide rail; On two side plates of the relative direction of housing sidewall 12, be respectively equipped with air intake opening 1 and gas outlet 13, wherein in air intake opening 1, be provided with draft tube 9, as shown in Figure 2, the surrounding of draft tube 9 is evenly distributed with gas port 15, and working gas enters by draft tube 9 and is full of enclosure interior; Described anode guide frame is a square framework, they are between upper and lower two Insulating frames, wherein the Insulating frame of below is fixed in housing sidewall, the Insulating frame 10 of top is positioned at the below of upper cover plate 4, the all parallel placements of anode guide frame 11, Insulating frame and upper cover plate 4, the upper edge of housing sidewall 12 is along being provided with O-ring seal, and upper cover plate 4 is fixedly connected with housing sidewall 12; Anodic wire 8 is fixed on anode guide frame 11, and wherein anodic wire 8 is gold-plated tungsten wire equidistant, parallel arrangement.Wherein the diameter of gold-plated tungsten wire is 25 μ m, and spacing is 10mm.The distance of anodic wire distance sources drawer is 35mm, and anodic wire is 10mm apart from the distance of upper cover plate.
Anodic wire 8 is welded on anode guide frame 11 by the mode of spot welding; During welding, first a point of anodic wire 8 is welded on anodic wire frame 11, then utilizes the gauge block of a constant weight by another captacula tension, exceptionally straight of anodic wire 8, then its point is welded on anodic wire frame 11.
In housing sidewall, be also provided with high voltage standard joint and Signal connector, between source drawer 7 and counter housing, by O-ring seal, seal.
Measure concrete operations for plane source is positioned on source drawer 7, then pushed counter, shut after source drawer 7 by gas outlet 13 2min that bleeds, by air intake opening 1, be filled with working gas P-10 again, after gas is full of counter cavity, micro-air intake valve that opens, regulates air intake valve to make flowmeter indication at about 60mL/min, then starts to measure.Operating personnel, by electronic system enter counter operating voltage, adopt scaler record through amplifying the counting after screening.
Employing active region diameter is 8mm
241am point source is tested, and these large area 2 π multifibres flow-gas proportional counter measurement mechanisms have been carried out to the metrology performance studies such as field uniformity test, and main measurement parameter is high pressure 900V, 50 times of enlargement factors, threshold value 1V.
Because sample tray is of a size of 485mm * 350mm, for diverse location in counter is accurately placed point source, first on sample tray, the better source of mark placement location is also numbered.Wherein active region area 40cm * 25cm, i.e. 1000cm
2; Anodic wire overlay area 43.5cm * 29cm, area is about 1260cm
2.
Field uniformity test is with pallet center (0,0) position is measured for true origin, each position is measured 5 times, measures 60s at every turn, calculates respectively mean value, standard deviation (SD) and the relative standard deviation (RSD) that provides 5 measurement results.Then with pallet center (0,0) position is reference point, and the mean value that measurement result is located in each position (X, Y) is to reference point (0,0) locate mean value and carry out normalizing, calculate and provide the relative deviation of each position counting mean value to reference point weighted mean value.Then utilize its single measurement relative standard deviation of all mean value calculation, to investigate the unevenness of electric field.Measurement result is in Table 1.
Table 1 field uniformity measurement result
| Position number | Average | SD | RSD | Relative deviation |
| (0,0) | 388352.5 | 391.5 | 0.10％ | 0.0％ |
| (0,+1) | 389068.7 | 416.9 | 0.11％ | 0.2％ |
| (0,+2) | 388813.2 | 567.5 | 0.15％ | 0.1％ |
| (0,+3) | 388388.5 | 635.9 | 0.16％ | 0.0％ |
| (0,+4) | 387415.5 | 616.9 | 0.16％ | -0.2％ |
| (0,+5) | 387434.3 | 412.5 | 0.11％ | -0.2％ |
| (0,+6) | 388106.5 | 658.6 | 0.17％ | 0.0％ |
| (0,+7) | 386166.3 | 468.3 | 0.12％ | -0.5％ |
| (0,+8) | 385474.3 | 343.2 | 0.09％ | -0.7％ |
| (0,-1) | 388977.5 | 669.1 | 0.17％ | 0.2％ |
| (0,-2) | 389589.0 | 404.4 | 0.10％ | 0.3％ |
| (0,-3) | 388983.8 | 538.9 | 0.14％ | 0.2％ |
| (0,-4) | 388887.7 | 664.4 | 0.17％ | 0.2％ |
| (0,-5) | 389245.0 | 140.7 | 0.04％ | 0.2％ |
| (0,-6) | 388647.3 | 469.3 | 0.12％ | 0.1％ |
| (0,-7) | 388293.2 | 304.3 | 0.08％ | 0.0％ |
| (0,-8) | 388385.2 | 479.1 | 0.12％ | 0.0％ |
| (+1,-7) | 391281.2 | 339.3 | 0.09％ | -0.2％ |
| (+2,-7) | 391250.8 | 347.5 | 0.09％ | -0.2％ |
| (+3,-7) | 391360.8 | 387.8 | 0.10％ | -0.1％ |
| (+4,-7) | 391128.0 | 925.2 | 0.24％ | -0.2％ |
| (+5,-7) | 391478.2 | 500.5 | 0.13％ | -0.1％ |
| (+6,-7) | 391328.5 | 797.6 | 0.20％ | -0.2％ |
| (+7,-7) | 391644.2 | 424.4 | 0.11％ | -0.1％ |
| (+8,-7) | 391567.8 | 756.3 | 0.19％ | -0.1％ |
| (+9,-7) | 390892.2 | 506.7 | 0.13％ | -0.3％ |
| (0,-7) | 391619.3 | 523.1 | 0.13％ | -0.1％ |
| (-1,-7) | 391140.0 | 352.5 | 0.09％ | 0.1％ |
| (-2,-7) | 390978.8 | 612.1 | 0.16％ | -0.2％ |
| (-3,-7) | 391728.8 | 432.6 | 0.11％ | -0.2％ |
| (-4,-7) | 391360.8 | 693.7 | 0.18％ | 0.0％ |
| (-5,-7) | 391385.2 | 623.2 | 0.16％ | -0.1％ |
| (-6,-7) | 391531.0 | 373.3 | 0.10％ | -0.1％ |
| (-7,-7) | 391068.0 | 493.3 | 0.13％ | -0.1％ |
| (-8,-7) | 391544.2 | 724.1 | 0.18％ | -0.2％ |
| (-9,-7) | 391658.3 | 507.2 | 0.13％ | -0.1％ |
| (-8,-4) | 391751.0 | 662.4 | 0.17％ | -0.1％ |
| (-8,-2) | 391420.0 | 672.5 | 0.17％ | 0.0％ |
| (-8,0) | 391579.0 | 536.5 | 0.14％ | -0.1％ |
| (-8,+2) | 391470.0 | 815.7 | 0.21％ | -0.1％ |
| (-8,+4) | 391106.0 | 309.1 | 0.08％ | -0.1％ |
| (-8,+7) | 391266.2 | 545.6 | 0.14％ | -0.2％ |
| (0,+7) | 390089.0 | 499.6 | 0.13％ | -0.2％ |
| (+2,+7) | 389870.3 | 719.1 | 0.18％ | -0.3％ |
| (+4,+7) | 390275.2 | 615.7 | 0.16％ | -0.3％ |
| (+6,+7) | 389532.8 | 339.5 | 0.09％ | -0.2％ |
| (+8,+7) | 391144.3 | 379.7 | 0.10％ | -0.4％ |
| (-2,+7) | 389832.5 | 239.5 | 0.06％ | 0.0％ |
| (-4,+7) | 389608.5 | 321.7 | 0.08％ | -0.4％ |
| (-6,+7) | 390707.8 | 420.3 | 0.11％ | -0.4％ |
| (-8,+7) | 391519.5 | 726.5 | 0.19％ | -0.1％ |
| (-6,0) | 391620.3 | 558.7 | 0.14％ | 0.1％ |
| (-4,0) | 390840.2 | 372.4 | 0.10％ | 0.1％ |
| (-2,0) | 391336.2 | 574.7 | 0.15％ | -0.1％ |
| (+2,0) | 391291.3 | 902.0 | 0.23％ | 0.0％ |
| (+4,0) | 391269.3 | 717.0 | 0.18％ | 0.0％ |
| (+6,0) | 391222.5 | 550.6 | 0.14％ | 0.0％ |
| (+8,0) | 391150.0 | 540.4 | 0.14％ | 0.0％ |
| (+8,+2) | 391258.7 | 386.4 | 0.10％ | 0.0％ |
| (+8,+4) | 390471.5 | 847.7 | 0.22％ | 0.0％ |
| (+8,-2) | 391124.7 | 494.9 | 0.13％ | -0.2％ |
| (+8,-4) | 391316.3 | 516.9 | 0.13％ | 0.0％ |
From table, outside the weighted mean value and reference point (0,0) mean deviation-0.7% of (0 ,+8) position, the result of other positions and reference point result all meet in ± 0.5%.In addition, utilizing its single measurement relative standard deviation of all mean value calculation is 0.38%, illustrate that the electric field unevenness of this counter is better than ± and 0.40%, institute's survey scope covers 45cm * 31cm, and useful detection area can reach about 1400cm
2.
Embodiment 2
Identical with embodiment 1 used test method, the anodic wire that different is in 2 π multifibres flow-gas proportional counters used is that the diameter of gold-plated tungsten wire is 30 μ m, and spacing is 15mm.The distance of anodic wire distance sources drawer is 38mm, and anodic wire is 15mm apart from the distance of upper cover plate.
Employing active region diameter is 8mm
241am point source carries out field uniformity test, learns that the unevenness of this counter is better than ± 0.38%.
Embodiment 3
Identical with embodiment 1 used test method, the anodic wire that different is in 2 π multifibres flow-gas proportional counters used is that the diameter of gold-plated tungsten wire is 30 μ m, and spacing is 20mm.The distance of anodic wire distance sources drawer is 40mm, and anodic wire is 20mm apart from the distance of upper cover plate.
Employing active region diameter is 8mm
241am point source carries out field uniformity test, learn that the unevenness of this counter is better than ± and 0.40%.
Claims (6)
1.2 π multifibres flow-gas proportional counters, this proportional counter is plate, drawer-type structure, it is characterized in that, it is mainly comprised of counter shell and the anodic wire, anode guide frame, Insulating frame and the source drawer that are positioned at counter enclosure; Described counter shell is the square framework being comprised of upper cover plate and housing sidewall, and wherein the one side of housing sidewall is placed source drawer, the integral structure that other three faces are comprised of side plate; Source drawer passes in and out counter shell by guide rail; On two side plates of the relative direction of housing sidewall, be respectively equipped with air intake opening and gas outlet, wherein in air intake opening, be provided with draft tube, the surrounding of draft tube is evenly distributed with gas port, and working gas enters by draft tube and is full of enclosure interior; Described anode guide frame is a square framework, they are between upper and lower two Insulating frames, wherein the Insulating frame of below is fixed in housing sidewall, the Insulating frame of top is positioned at the below of upper cover plate, anode guide frame, Insulating frame and upper cover plate be parallel placement all, the upper edge of housing sidewall is along being provided with O-ring seal, and upper cover plate is fixedly connected with housing sidewall; Anodic wire is fixed on anode guide frame, and wherein the arrangement mode of anodic wire is equidistant, parallel arrangement.
2. according to right, ask 2 π multifibres flow-gas proportional counters described in 1, it is characterized in that, described anodic wire is gold-plated tungsten wire, and its diameter is 25～30 μ m, and spacing is 10～20mm.
3. according to right, ask 2 π multifibres flow-gas proportional counters described in 1, it is characterized in that, the distance of described anodic wire distance sources drawer is 35～40mm, and anodic wire is 10～20mm apart from the distance of upper cover plate.
4. according to right, ask 2 π multifibres flow-gas proportional counters described in 1, it is characterized in that, described anodic wire is welded on anode guide frame by the mode of spot welding.
5. according to right, ask 2 π multifibres flow-gas proportional counters described in 1, it is characterized in that, in described housing sidewall, be also provided with high voltage standard joint and Signal connector.
6. according to right, ask 2 π multifibres flow-gas proportional counters described in 1, it is characterized in that, between described source drawer and counter housing, by O-ring seal, seal.
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| CN201420199449.0U CN203849420U (en) | 2014-04-23 | 2014-04-23 | 2 [pi] multi-wire gasflow proportional counter |
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| CN201420199449.0U CN203849420U (en) | 2014-04-23 | 2014-04-23 | 2 [pi] multi-wire gasflow proportional counter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926615A (en) * | 2014-04-23 | 2014-07-16 | 中国原子能科学研究院 | Two-pi multi-wire gas-flow proportional counter |
-
2014
- 2014-04-23 CN CN201420199449.0U patent/CN203849420U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926615A (en) * | 2014-04-23 | 2014-07-16 | 中国原子能科学研究院 | Two-pi multi-wire gas-flow proportional counter |
| CN103926615B (en) * | 2014-04-23 | 2016-05-04 | 中国原子能科学研究院 | 2 π multifibres flow-gas proportional counters |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140924 Effective date of abandoning: 20160504 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |