CN204537984U - A kind of multilayer fission chamber device being used for (n, xn) section gauge - Google Patents
A kind of multilayer fission chamber device being used for (n, xn) section gauge Download PDFInfo
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- CN204537984U CN204537984U CN201520155299.8U CN201520155299U CN204537984U CN 204537984 U CN204537984 U CN 204537984U CN 201520155299 U CN201520155299 U CN 201520155299U CN 204537984 U CN204537984 U CN 204537984U
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- Prior art keywords
- ionization chamber
- cover plate
- electrode
- chamber cover
- insulated column
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Abstract
A kind of for (n, xn) the multilayer fission chamber device of section gauge, comprise ionization chamber shell, ionization chamber cover plate one, ionization chamber cover plate two, aluminum electrode, negative electrode, passive electrode (anode), insulating sleeve, insulated column and aluminum pillar, ionization chamber shell, ionization chamber cover plate one and ionization chamber cover plate two surround ionization chamber.Be provided with aluminum pillar in insulated column, insulated column two ends are individually fixed on ionization chamber cover plate one and ionization chamber cover plate two.Aluminum electrode and insulating sleeve are alternately enclosed within insulated column, and aluminum electrode two sides is provided with sample coating.Be filled with working gas in ionization chamber, ionization chamber cover plate one and ionization chamber cover plate two are respectively equipped with air inlet and outlet pipe.Aluminum electrode is connected with passive electrode with negative electrode, and negative electrode is connected with ionization chamber shell, ionization chamber cover plate one and ionization chamber cover plate two.The utility model has larger fission event detection efficient, lower neutron background, can effectively reduce measure error, thus improves the accuracy of measurement result.
Description
Technical field
Facility is measured in the fission reaction that the utility model belongs in nuclear physics experiment, is specifically related to a kind of multilayer fission chamber device for (n, xn) section gauge, accurately can deducts fission event.The aluminum that this device adopts neutron reaction (n, xn) cross section little, as shell and electrode, has lower neutron background.Adopt the mode of multiple-channel output, the α that can effectively reduce in high count rate situation piles up, and the fission chamber output pulse signal rise time is fast, can accurate timing.The present invention has the detection efficient of higher fission event, is mainly applicable to the accurate measurement of laboratory and environment center fission event.
Background technology
Fission chamber refers to the ionization chamber detector for measuring nuclear fission event.In the experiment measuring process of particularly cross-section (n, xn), be often attended by fission reaction and produce.When there is fission reaction, often supervene fission neutron, these neutrons can make the measurement of cross-section produce error.In order to deduct the impact of fission neutron on measurement result, improving measuring accuracy, often adopting fission chamber to deduct the neutron (anticoincidence technique) of fission event generation.So in order to reduce the background that fission neutron causes as far as possible, fission chamber will have detection efficient high as far as possible, fission signal has the rise time fast as far as possible.Therefore, the present invention adopts the mode of many targets sheet and multiple-channel output; Secondly, the material that the atomic nucleus that (n, xn) nuclear reaction cross section is less and the threshold of reaction is higher is formed be selected; Again, fission chamber shell and electrode material consumption will lack as much as possible, to reduce the impact of scattered neutron.
The shortcoming of existing technology is embodied in following two aspects: first, the shell that fission chamber adopts and electrode material often have higher cross-section, and neutron background is too high.Secondly, when measuring in (n, xn) reaction cross-section, fission chamber electrode number very little, in order to produce (n, the xn) reaction (improve and measure order of accuarcy) meeting statistical requirements, needs on electrode, plate thicker sample.Like this, in the fission spectrum of sample, the packing ratio of alpha signal is comparatively serious, reduces the detection efficient of fission event.
Utility model content
For above-mentioned problems of the prior art, the utility model aims to provide the multilayer fission chamber device for (n, xn) section gauge of a kind of many targets sheet, high efficiency, low neutron background.To achieve these goals, the utility model takes following technical scheme:
A kind of for (n, xn) the multilayer fission chamber device of section gauge, comprises ionization chamber shell, ionization chamber cover plate one, ionization chamber cover plate two, some aluminum electrodes, negative electrode, passive electrode (anode), insulating sleeve, insulated column, aluminum pillar.The space that described ionization chamber shell, ionization chamber cover plate one, ionization chamber cover plate two surround forms ionization chamber, and ionization chamber shell, ionization chamber cover plate one and ionization chamber cover plate two are all connected with negative electrode.Described aluminum pillar is placed in insulated column, and described insulated column one end is fixed on ionization chamber cover plate one, and the other end is fixed on ionization chamber cover plate two.Be enclosed within insulated column after described aluminum electrode punching, on described insulated column, cover has some insulating sleeves, and aluminum electrode is fixed between insulating sleeve.Aluminum electrode is alternately connected with passive electrode (anode) with negative electrode, and each passive electrode (anode) is drawn by ionization chamber cover plate one.Working gas methane is filled with in ionization chamber, ionization chamber cover plate one is provided with admission line, and ionization chamber cover plate two is provided with outlet pipe, and described admission line and outlet pipe are for the input service gas that circulates, and finely tune the pressure of indoor gas, make ionization chamber be in optimum Working.
Further, described insulated column is two, and insulated column two ends are provided with screw, and insulated column is fixed on ionization chamber cover plate one and ionization chamber cover plate two by described screw.
Further, on described insulated column, cover has 51 insulating sleeves, and described insulating sleeve height is 2mm.
Further, described aluminum electrode is 50, and aluminum electrode spacing is 2mm.
Further, described aluminum electrode diameter is 4.5cm, and aluminum electrode two sides is coated with
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usample, described in
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usample coating diameter is 1.5cm.
Further, described ionization chamber shell is cylindrical aluminium shell.
Further, each aluminum electrode is alternately connected with collector with negative electrode.
Further, described insulating material is polytetrafluoroethylene.
The beneficial effects of the utility model are:
1) device has 50 plate electrode compositions, and every plate electrode both sides are coated with
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usample, has larger sample size, can produce (n, the xn) event meeting statistical requirements, can effectively reduce measure error under the condition that every sheet coating is very thin, improves the order of accuarcy of measurement result.
2) electrode and sheathing material thereof adopt aluminum material, effectively reduce the impact of background (n, xn) nuclear reaction on measurement result, reduce the interference of background neutron for measurement result.
3) monolithic has thinner coating, effectively can reduce the impact of α accumulation on measurement result, improve the resolving power of power spectrum and the detection efficient of experiment.
4) this device has less electrode spacing, effectively reduces the rise time of the pulse signal that collector exports.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation.
Mark in figure: 1-passive electrode (anode), 2-ionization chamber cover plate one, 3-
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ucoating, 4-aluminum electrode, 5-admission line, 6-aluminium shell, 7-insulating sleeve, 8-insulated column, 9-aluminum pillar, 10-fixed screw, 11-outlet pipe, 12-ionization chamber cover plate two, 13-negative electrode, 14-methane gas.
Embodiment
For the ease of understanding, below by embodiment, by reference to the accompanying drawings, the technical solution of the utility model is further described in detail:
As shown in Figure 1, a kind of multilayer fission chamber device being used for (n, xn) section gauge, comprises aluminum electrode 4, passive electrode (anode) 1, negative electrode 13, insulating sleeve 7, insulated column 8, aluminum pillar 9 and aluminium shell 6.Aluminium shell 6 is cylinder blanket, aluminium shell 6 one end is provided with ionization chamber cover plate 1, the other end is provided with ionization chamber cover plate 2 12, and cylindrical aluminium shell 6, ionization chamber cover plate 1 and ionization chamber cover plate 2 12 surround columnar ionization room, are filled with working gas-methane 14 in ionization chamber.Aluminium shell 6, ionization chamber cover plate 1 and ionization chamber cover plate 2 12 are all connected with negative electrode 13.Insulating sleeve 7 and aluminum electrode 4 are alternately placed on insulated column 8, separated by insulating sleeve 7 between each aluminum electrode 4 and fix, insulated column 8 two ends are provided with fixed screw 10, insulated column 8 two ends are individually fixed on ionization chamber cover plate 1 and ionization chamber cover plate 2 12 by fixed screw 10, thus fixing aluminum electrode 4, be provided with aluminum pillar 9 in insulated column 8.Aluminum electrode 4 for diameter be the circular piece of 4.5cm, aluminum electrode 4 two sides is diameter is 1.5cm's
239p
ucoating 3.Passive electrode (anode) 1 and negative electrode 13 are alternately connected to form collection electric field with aluminum electrode 4; Passive electrode (anode) 1 is provided with insulated wire, and ionization chamber cover plate 1 is provided with hole, and the passive electrode (anode) 1 being provided with insulated wire is drawn by the hole on ionization chamber cover plate 1; Ionization chamber cover plate 1 is provided with the admission line 5 that insulating material is formed, ionization chamber cover plate 2 12 is provided with the outlet pipe 11 that insulating material is formed, admission line 5 and outlet pipe 11 are for the input service gas-methane gas 14 that circulates, and finely tune the pressure of indoor gas, make ionization chamber be operated in optimum state.
The measuring process of fission reaction of the present utility model is: fill with methane gas 14 by described admission line 5 to ionization chamber; Give multilayer aluminum electrode 4 alternately in addition high pressure by passive electrode (anode) 1, the electrode 4 and the negative electrode 13 that add high pressure alternately form highfield; Described in neutron bombardment
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ucoating 3, with its generation fission reaction, produces charged fission fragment, and fission fragment causes described methane gas 14 to ionize, excites formation electron-ion pair; Electron-ion in highfield during directed movement in passive electrode 1 output pulse signal.There is a fission reaction, export pulsatile once signal at passive electrode 1.
Above-described embodiment just illustrating or explaining technical solutions of the utility model, and the restriction that should not be construed as technical solutions of the utility model, obviously, those skilled in the art can carry out various modifications and variations to the utility model and not depart from spirit and scope of the present utility model.If these amendments and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model also comprises these amendment and modification.
Claims (8)
1., for the multilayer fission chamber device of (n, xn) section gauge, comprise ionization chamber shell, ionization chamber cover plate one, ionization chamber cover plate two, some aluminum electrodes, negative electrode, passive electrode, some insulating sleeves, insulated column and aluminum pillar, described ionization chamber shell, ionization chamber cover plate one, the space that ionization chamber cover plate two surrounds forms ionization chamber, described insulated column two ends are individually fixed on ionization chamber cover plate one and ionization chamber cover plate two, insulated column inner sleeve has aluminum pillar, outside insulated column, cover has some insulating sleeves, described aluminum electrode is circular, be placed on after punching outside insulated column, aluminum electrode is between insulating sleeve, fixed by insulating sleeve, described aluminum electrode two sides is sample coating, and be filled with working gas methane in described ionization chamber, ionization chamber cover plate one is provided with admission line, ionization chamber cover plate two is provided with outlet pipe, and described aluminum electrode replaces and negative electrode, passive electrode is connected, negative electrode and ionization chamber shell, ionization chamber cover plate one and ionization chamber cover plate two are connected, each passive electrode holding wire is drawn by ionization chamber cover plate one.
2. the multilayer fission chamber device for (n, xn) section gauge according to claim 1, it is characterized in that, described insulated column has two, and insulated column inner sleeve has aluminum pillar, and described insulated column two ends are provided with fixed screw.
3. the multilayer fission chamber device for (n, xn) section gauge according to claim 2, it is characterized in that, described insulated column overcoat has 51 insulating sleeves, and described insulating sleeve height is 2mm.
4. the multilayer fission chamber device for (n, xn) section gauge according to claim 1, it is characterized in that, described aluminum electrode is 50.
5. the multilayer fission chamber device for (n, xn) section gauge according to claim 4, is characterized in that, the circular piece of described aluminum electrode to be diameter be 4.5cm, described sample coating is
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usample coating, described in
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usample coating diameter is 1.5cm.
6. the multilayer fission chamber device for (n, xn) section gauge according to claim 1, it is characterized in that, each aluminum electrode is alternately connected with passive electrode with negative electrode.
7. the multilayer fission chamber device for (n, xn) section gauge according to claim 1, it is characterized in that, described ionization chamber shell is cylindrical aluminium shell.
8. the multilayer fission chamber device for (n, xn) section gauge according to any one of claims 1 to 3, it is characterized in that, described insulating material is polytetrafluoroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520155299.8U CN204537984U (en) | 2015-03-14 | 2015-03-14 | A kind of multilayer fission chamber device being used for (n, xn) section gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520155299.8U CN204537984U (en) | 2015-03-14 | 2015-03-14 | A kind of multilayer fission chamber device being used for (n, xn) section gauge |
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| Publication Number | Publication Date |
|---|---|
| CN204537984U true CN204537984U (en) | 2015-08-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520155299.8U Expired - Fee Related CN204537984U (en) | 2015-03-14 | 2015-03-14 | A kind of multilayer fission chamber device being used for (n, xn) section gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204537984U (en) |
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2015
- 2015-03-14 CN CN201520155299.8U patent/CN204537984U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150805 Termination date: 20170314 |