CN205450297U - Slow neutron conversion body and slow neutron detector - Google Patents
Slow neutron conversion body and slow neutron detector Download PDFInfo
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- CN205450297U CN205450297U CN201521127191.4U CN201521127191U CN205450297U CN 205450297 U CN205450297 U CN 205450297U CN 201521127191 U CN201521127191 U CN 201521127191U CN 205450297 U CN205450297 U CN 205450297U
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- slow neutron
- conversion body
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Abstract
The utility model relates to a slow neutron conversion body and slow neutron detector belongs to the slow neutron and surveys the field. A slow neutron conversion body is including the base member, the base member include a plurality of holes of extending along the first direction with insulation wall between a plurality of holes, a plurality of holes are for running through the hole. The slow neutron conversion body is still including covering at least a plurality of holes expose the surface the boron layer. It to keep higher slow neutron detection efficiency to change physically and have this slow neutron conversion slow neutron detector physically according to the slow neutron of this application. In addition, can reduce the complexity of detector preparation and the cost of preparation to realize effective, convenient, low -cost slow neutron and survey the mesh.
Description
Technical field
It relates to slow neutron detection, in particular to slow neutron conversion body and the slow neutron detector with this slow neutron transformational structure.
Background technology
Along with slow neutron detection, imaging technique gradually increase in multiple directions application such as Homeland Security, material monitoring, the measurements of scattering of slow neutrons source, the demand for slow neutron detector is also gradually increased.But, widely used3He gas can not meet the use demand of sustainable growth, and different types of novel slow neutron detector is developed for substituting3He, including gas slow neutron detector, scintillator slow neutron detector, quasiconductor slow neutron detector etc..
For a slow neutron detector, slow neutron conversion body is one of them important feature.The neutral of slow neutron own, except a few slow neutron sensitivity nucleic such as6Li、10B, Gd etc., slow neutron is smaller with the reaction cross-section of other materials, and visual effect is exactly that slow neutron is difficult to be arrived by direct detection.Rich in more slow neutron sensitivity nucleic inside slow neutron conversion body, it is possible to by nuclear reaction, slow neutron is converted to charged particle.Detector can measure the energy of these charged particles, positional information more conveniently, and then can obtain the related physical information of incident slow neutron.
In gas slow neutron detector designs, difference according to the basic detector used, can there be polytype slow neutron conversion body and slow neutron detector, such as based on cylindrical proportional detector array gas slow neutron detector, the gas slow neutron detector stacked based on plate ionization chamber.
In gas slow neutron detector based on cylindrical proportional detector array, most basic slow neutron probe unit is a cylindrical proportional detector, each unit has independent anode wire and signal collection processing system, Typical Representative such as " Caulis et Folium Oryzae pipe " slow neutron detector array.But, the slow neutron sensitive area of detector and slow neutron detection efficient substantially quadratic power to cylindrical proportional detector number is directly proportional, in whole system, the installation, maintenance of a large amount of anode wires has the biggest workload, and the difference of each slow neutron probe unit detection efficient also can affect the performance that system is overall.
In the gas slow neutron detector stacked based on plate ionization chamber, most basic slow neutron probe unit is a plate ionization chamber, and each ionization chamber has independent 2D signal read-out system, Typical Representative such as Gd-GEM slow neutron detector.But, the slow neutron detection efficient ratio of monolayer plane ionization chamber is relatively low, need to use the method such as multiple stacking, slow neutron glancing incidence to improve overall slow neutron detection efficient, but this brings the biggest pressure can to overall signal readout process, it has not been convenient to realize the detection of large area slow neutron.
Accordingly, it would be desirable to a kind of new slow neutron conversion body and slow neutron detector.
Being only used for strengthening the understanding of background of this disclosure in information above-mentioned disclosed in described background section, therefore it can include not constituting the information to prior art known to persons of ordinary skill in the art.
Utility model content
Disclosure one slow neutron conversion body and slow neutron detector, it is possible to keep higher slow neutron detection efficient.
Other characteristics of the disclosure and advantage will be apparent from by detailed description below, or partially by the practice of the disclosure and acquistion.
One side according to the disclosure, it is provided that a kind of slow neutron conversion body, including: matrix, described matrix includes the insulation wall between multiple holes and the plurality of hole extended in a first direction；Boron layer, at least covers the exposed surface of the plurality of hole.The plurality of hole is perforated holes.
According to some embodiments, each hole has circle or polygonal cross-section.
According to some embodiments, each hole has equilateral polygon section.
According to some embodiments, each hole has regular hexagonal section and the plurality of hole is uniformly arranged, thus described slow neutron conversion body has alveolate texture.
According to some embodiments, each hole has the inscribed circle diameter in the range of 0.1mm to 20mm.
According to some embodiments, each hole has the inscribed circle diameter in the range of 3mm to 10mm.
According to some embodiments, described matrix along described first direction, there is 1cm to 30cm in the range of height.
According to some embodiments, described matrix along described first direction, there is 10cm to 15cm in the range of height.
According to some embodiments, described boron layer includesnatB。
According to some embodiments, described boron layer has 0.232-0.694mg/cm2Mass thickness.
According to some embodiments, described boron layer has 0.3-0.4mg/cm2Mass thickness.
According to some embodiments, described boron layer has 0.37mg/cm2Mass thickness.
According to some embodiments, described matrix has cube or rectangular shape.
According to some embodiments, described insulation wall has 1 micron to the thickness in 50 micrometer ranges.
According to some embodiments, described insulation wall has 5 microns to the thickness in 20 micrometer ranges.
According to some embodiments, described insulation wall includes aramid paper.
According to another aspect of the present disclosure, it is provided that a kind of slow neutron detector, including: foregoing arbitrary slow neutron conversion body, wherein said multiple holes are filled ionization working gas；Cathode plate, is arranged on one end of described slow neutron conversion body；Electron multiplier, is arranged on the other end of described slow neutron conversion body；Plate, is oppositely arranged with described electron multiplier, and described cathode plate and described plate are for forming electric field between.
According to some embodiments, described electron multiplier includes gas electron multiplier, microgrid flat gas detector.
According to some embodiments, slow neutron detector also includes the field cage with cylindrical-shaped structure, and described field cage is around described slow neutron conversion body.
According to some embodiments, described field cage includes multiple coaxial copper band, and the plurality of coaxial copper band is for respectively plus gradient voltage.
According to some embodiments, slow neutron detector also includes the protection ring being arranged on cage both sides, described field.
Slow neutron conversion body according to the disclosure and slow neutron detector, it is possible to keep higher slow neutron detection efficient.It addition, according to the scheme of the disclosure, complexity and the cost of making that detector makes can be reduced, thus realizes effective, convenient, the slow neutron detection purpose of low cost.
Accompanying drawing explanation
Describing its example embodiment in detail by referring to accompanying drawing, above and other feature of the disclosure and advantage will be apparent from.
Fig. 1 illustrates the axonometric chart of the slow neutron conversion body according to the disclosure one example embodiment；
Fig. 2 illustrates the sectional view of the slow neutron conversion body shown in Fig. 1；
Fig. 3 illustrates the slow neutron detection efficient of the slow neutron conversion body according to the disclosure and the graph of a relation of boron layer mass thickness；
Fig. 4 illustrates the structure chart of the slow neutron detector according to the disclosure one example embodiment；
Fig. 5 illustrates the fundamental diagram of the slow neutron detector according to the disclosure.
Detailed description of the invention
It is described more fully with example embodiment referring now to accompanying drawing.But, example embodiment can be implemented in a variety of forms, and is not understood as limited to embodiment set forth herein；On the contrary, it is provided that these embodiments make the disclosure will fully and completely, and the design of example embodiment is conveyed to those skilled in the art all sidedly.The most identical reference represents same or similar part, thus will omit repetition thereof.
Additionally, described feature, structure or characteristic can be combined in one or more embodiment in any suitable manner.In the following description, it is provided that many details thus provide fully understanding of embodiment of this disclosure.It will be appreciated, however, by one skilled in the art that the technical scheme of the disclosure can be put into practice and do not have in described specific detail one or more, or other method, constituent element, material, device, step etc. can be used.In other cases, known features, method, device, realization, material or operation are not shown in detail or describe to avoid each side of the fuzzy disclosure.
The disclosure proposes a kind of new detector, utilizes boron layer structure fabrication slow neutron conversion body, and it completes the functions such as slow neutron absorption, charged particle ionization and electronics drift, and recycling electron multiplication device realizes the amplification of signal.
Fig. 1 illustrates the axonometric chart of the slow neutron conversion body according to the disclosure one example embodiment.Fig. 2 illustrates the sectional view of the slow neutron conversion body shown in Fig. 1.Should be understood that the structure that Fig. 1-2 schematically shows is only a kind of example of the slow neutron conversion body according to the disclosure, the disclosure is not limited to this.
As shown in Figure 1-2, matrix 120 can be included according to the slow neutron conversion body 100 of the disclosure.
Matrix 120 can include the insulation wall 122 running through between multiple holes 124 of described matrix and the plurality of hole in the first direction.
Each hole 124 can have circle or polygonal cross-section.According to some embodiments, each hole has equilateral polygon section.According to other embodiments, individual hole has regular hexagonal section and the plurality of hole is uniformly arranged, thus described slow neutron conversion body has alveolate texture, and as shown in Figure 1-2, but the disclosure is not limited to this.Hole 124 can be used for filling ionization working gas, as described in detail by below.
As in figure 2 it is shown, slow neutron conversion body 100 also includes the boron layer 126 at least covering the exposed surface of the plurality of hole 124.According to some embodiments, boron layer 126 can be formed by dip-coating or other suitable modes.
Hole 124 can have smooth exposed surface, so that the boron layer covering matrix 122 has preferable uniformity and surface roughness (such as, the flatness less than 0.1 micron).
According to the disclosure, can usenatB (natural boron) or10B (purification boron) is as slow neutron transition material.
According to some embodiments, matrix 120 has cube or rectangular shape, but the disclosure is not limited to this.
According to some embodiments, insulation wall 122 can have 1 micron to the thickness in 50 micrometer ranges.Such as, insulation wall can have 5 microns to the thickness in 20 micrometer ranges.
According to some embodiments, insulation wall 122 includes aramid paper.
Fig. 3 illustrates the curve chart of the slow neutron conversion body slow neutron detection efficient according to the disclosure and boron layer mass thickness relation.
If as it is shown on figure 3, usednatB as slow neutron transition material, (density 2.35g/cm when the mass thickness of boron layer is maintained in the range of 0.232-0.694mg/cm23Time, corresponding thickness 1-3 μm), it is possible to achieve higher slow neutron detection efficient.
According to some embodiments, boron layer has 0.232-0.694mg/cm2Mass thickness.Further according to some embodiments, described boron layer has 0.3-0.4mg/cm2Mass thickness.Further according to some embodiments, boron layer has 0.37mg/cm2Mass thickness.
Inventor finds, the thinnest meeting of boron layer causes the probability reacted with slow neutron to reduce, and the heavy charged particle that the thickest meeting of boron layer causes reaction to produce is difficult to enter cellular hole in the coating of conversion body, and this all can be substantially reduced the slow neutron Effect on Detecting of entirety.
It addition, the aperture of slow neutron conversion body wants suitable.According to some embodiments, hole 124 can have the inscribed circle diameter in the range of 0.1mm to 20mm.According to other embodiments, hole can have the inscribed circle diameter in the range of 3mm to 10mm.When using in this application, inscribed circle refers to can be with the most polygon tangent circle of hole.
Additionally, the height of slow neutron conversion body also wants suitable, to take into account higher slow neutron detection efficient and preferable electronics derivation effect.According to some embodiments, matrix 120 has the height in the range of 1cm to 30cm.Such as, the height in the range of matrix 120 can have 10cm to 15cm.
According to some embodiments, can by nanoscale boron powder uniform deposition is made alveolate texture on aramid paper base material, then aperture can be made through cutting and cutting, length, boron layer thickness are satisfied by the slow neutron conversion body that requires.
Fig. 4 schematically shows the structure chart of the slow neutron detector according to the disclosure one example embodiment.
As shown in Figure 4, slow neutron detector 500 can include slow neutron conversion body 520.Slow neutron conversion body 520 can be foregoing slow neutron conversion body.Slow neutron detector 500 also includes being arranged on the cathode plate 510 of described slow neutron conversion body one end, the electron multiplier 530 being arranged on the other end of described slow neutron conversion body 520 and the plate 540 being oppositely arranged with described electron multiplier 530.Electric field is formed to drive electronics to drift about to electron multiplier one end, as will be described in detail later between described cathode plate 510 and described plate 520.
As it was previously stated, slow neutron conversion body 520 can include matrix 120 and boron layer 126.Multiple holes 124 of matrix 120 are filled ionization working gas, for producing electronics, as will be described in detail later.The working gas that electronics transverse diffusion coeficient is little can be used, make electronics horizontal proliferation during drift is derived the least.According to some embodiments, ionization working gas can be argon and the mixed gas of carbon dioxide of 5% of 95%, but the disclosure is not limited to this, it is also possible to the working gas that gas is suitable.
According to some embodiments, electron multiplier 530 can include gas electron multiplier, microgrid flat gas detector etc..Electron multiplier can double the quantity by electronics, it is ensured that the effectively formation of the signal of telecommunication.
According to some embodiments, as it is shown in figure 5, slow neutron detector 500 may also include the field cage 550 with cylindrical-shaped structure, described field cage 550 is around described slow neutron conversion body.Field cage 550 can include multiple coaxial copper band, and the plurality of coaxial copper band is for respectively plus gradient voltage.Cage 550 can play the effect of Isolated Shield, and can retrain the equipotential surface of internal gas environment at major part region keeping parallelism, i.e. forms the uniform electric field of approximation.
Additionally, according to some embodiments, slow neutron detector 500 may also include protection ring (not shown).Protection ring may be provided at a cage both sides, and for providing the current potential of end flat, the realization to uniform electric field helps out.
Fig. 5 illustrates the operation principle of the slow neutron detector according to the disclosure.The operation principle of the slow neutron detector 500 according to the disclosure is described referring to Fig. 4 and Fig. 5.
As illustrated in figures 4-5, three parts can be divided into according to the slow neutron detection process of the disclosure: slow neutron absorb electronically form, electronics drift, electron multiplication and signal collection.
Slow neutron absorbs the physical process in the stage of electronically forming and occurs inside slow neutron conversion body.Incident slow neutron 501 occurs in boron layer 12610B (n, α)7Li react, produce heavy charged particle alpha-particle with7Li, their direction of motion on the contrary and is equally distributed in 4 π solid angles.Therefore, during every secondary response most only one of which particle enters the gaseous environment of cellular hole 124.When alpha-particle or7In Li gaseous environment in hole during motion, ionization sedimentary energy can be passed through, produce electronics.If these electronics are detected by detector, it becomes possible to form the corresponding signal of telecommunication.
In this link, slow neutron occurs through during boron layer 12610B (n, α)7Probability and the alpha-particle of Li reaction,7Li enters the average probability of hole 124 and determines the slow neutron detection efficient that whole detector is possible.As described previously with reference to described in Fig. 3, when the mass thickness of boron layer is maintained at 0.232-0.694mg/cm2In the range of time (density 2.35g/cm3Time, corresponding thickness 1-3 μm), it is possible to achieve higher slow neutron detection efficient.
Due to the ionisation effect of heavy charged particle, the initial position that electronics produces is distributed in the inside of each cellular hole of whole slow neutron conversion body.For making these electronically form the signal of telecommunication of output, the scheme of the disclosure makes electronics drift about out in hole.As it was previously stated, electronics drifts about to one end of slow neutron conversion body under electric field driven, i.e. drift about to electron multiplier 530.
Electron multiplier 530 can double the quantity by electronics, it is ensured that the effectively formation of the signal of telecommunication.The electron multiplication devices such as gas electron multiplier (GEM), microgrid flat gas detector (micromegas) all can coordinate boron layer slow neutron conversion body normally to work.
Electronics is collected by plate 540 and forms the signal of telecommunication further, and here is omitted.
By above detailed description, those skilled in the art is it can be readily appreciated that have one or more of the following advantages according to the system and method for this utility model embodiment.
Utilize the novel boron layer slow neutron conversion body of the disclosure, the gas slow neutron detector of better performances can be made.
On the basis of keeping higher slow neutron detection efficient, reduce complexity and the cost of making that detector makes.
More than it is particularly shown and described the exemplary embodiment of the disclosure.It should be understood that the disclosure is not limited to the disclosed embodiments, on the contrary, the disclosure is intended to contain the various amendments and equivalent arrangements comprised in the spirit and scope of the appended claims.
Claims (21)
1. a slow neutron conversion body, it is characterised in that including:
Matrix, including the insulation wall between the multiple holes extended in a first direction and the plurality of hole；
Boron layer, at least covers the exposed surface of the plurality of hole,
The plurality of hole is perforated holes.
2. slow neutron conversion body as claimed in claim 1, it is characterised in that each hole has circle or polygonal cross-section.
3. slow neutron conversion body as claimed in claim 2, it is characterised in that each hole has equilateral polygon section.
4. slow neutron conversion body as claimed in claim 3, it is characterised in that each hole has regular hexagonal section and the plurality of hole is uniformly arranged, thus described slow neutron conversion body has alveolate texture.
5. slow neutron conversion body as claimed in claim 1, it is characterised in that each hole has the inscribed circle diameter in the range of 0.1mm to 20mm.
6. slow neutron conversion body as claimed in claim 5, it is characterised in that each hole has the inscribed circle diameter in the range of 3mm to 10mm.
7. slow neutron conversion body as claimed in claim 1, it is characterised in that described matrix along described first direction, there is 1cm to 30cm in the range of height.
8. slow neutron conversion body as claimed in claim 7, it is characterised in that described matrix along described first direction, there is 10cm to 15cm in the range of height.
9. slow neutron conversion body as claimed in claim 1, it is characterised in that described boron layer isnatB layer.
10. slow neutron conversion body as claimed in claim 9, it is characterised in that described boron layer has 0.232-0.694mg/cm2Mass thickness.
11. slow neutron conversion bodies as claimed in claim 9, it is characterised in that described boron layer has 0.3-0.4mg/cm2Mass thickness.
12. slow neutron conversion bodies as claimed in claim 9, it is characterised in that described boron layer has 0.37mg/cm2Mass thickness.
13. slow neutron conversion bodies as claimed in claim 1, it is characterised in that described matrix has cube or rectangular shape.
14. slow neutron conversion bodies as claimed in claim 1, it is characterised in that described insulation wall has 1 micron to the thickness in 50 micrometer ranges.
15. slow neutron conversion bodies as claimed in claim 1, it is characterised in that described insulation wall has 5 microns to the thickness in 20 micrometer ranges.
16. slow neutron conversion bodies as claimed in claim 1, it is characterised in that described insulation wall includes aramid paper insulation wall.
17. 1 kinds of slow neutron detectors, it is characterised in that including:
Slow neutron conversion body as according to any one of claim 1-16, fills ionization working gas in wherein said multiple holes；
Cathode plate, is arranged on one end of described slow neutron conversion body；
Electron multiplier, is arranged on the other end of described slow neutron conversion body；
Plate, is oppositely arranged with described electron multiplier, and described cathode plate and described plate are for forming electric field between.
18. slow neutron detectors as claimed in claim 17, it is characterised in that described electron multiplier includes gas electron multiplier, microgrid flat gas detector.
19. slow neutron detectors as claimed in claim 17, it is characterised in that also including the field cage with cylindrical-shaped structure, described field cage is around described slow neutron conversion body.
20. slow neutron detectors as claimed in claim 19, it is characterised in that described field cage includes multiple coaxial copper band, the plurality of coaxial copper band is for respectively plus gradient voltage.
21. slow neutron detectors as claimed in claim 19, it is characterised in that also include the protection ring being arranged on cage both sides, described field.
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| CN201521127191.4U CN205450297U (en) | 2015-12-29 | 2015-12-29 | Slow neutron conversion body and slow neutron detector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445779A (en) * | 2015-12-29 | 2016-03-30 | 清华大学 | Slow neutron conversion body and slow neutron detector |
| CN106199680A (en) * | 2016-09-13 | 2016-12-07 | 清华大学 | Slow neutron detection device |
| CN107831525A (en) * | 2017-12-11 | 2018-03-23 | 清华大学 | High purity germanium detector |
| CN112114350A (en) * | 2020-09-04 | 2020-12-22 | 南华大学 | Micromegas-based fission chamber |
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2015
- 2015-12-29 CN CN201521127191.4U patent/CN205450297U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105445779A (en) * | 2015-12-29 | 2016-03-30 | 清华大学 | Slow neutron conversion body and slow neutron detector |
| US10126440B2 (en) | 2015-12-29 | 2018-11-13 | Tsinghua University | Slow neutron conversion body and slow neutron detector |
| CN105445779B (en) * | 2015-12-29 | 2019-01-25 | 清华大学 | Slow neutron conversion body and slow neutron detector |
| CN106199680A (en) * | 2016-09-13 | 2016-12-07 | 清华大学 | Slow neutron detection device |
| US10732306B2 (en) | 2016-09-13 | 2020-08-04 | Nuctech Company Limited | Slow neutron detection device |
| CN107831525A (en) * | 2017-12-11 | 2018-03-23 | 清华大学 | High purity germanium detector |
| CN112114350A (en) * | 2020-09-04 | 2020-12-22 | 南华大学 | Micromegas-based fission chamber |
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