CN108345028B - A kind of shield and its design method applied to neutron scattering chamber - Google Patents
A kind of shield and its design method applied to neutron scattering chamber Download PDFInfo
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- CN108345028B CN108345028B CN201810055760.0A CN201810055760A CN108345028B CN 108345028 B CN108345028 B CN 108345028B CN 201810055760 A CN201810055760 A CN 201810055760A CN 108345028 B CN108345028 B CN 108345028B
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- 238000001956 neutron scattering Methods 0.000 title claims abstract description 34
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- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052793 cadmium Inorganic materials 0.000 description 3
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- 229910052688 Gadolinium Inorganic materials 0.000 description 2
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- 229920001971 elastomer Polymers 0.000 description 2
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Measurement Of Radiation (AREA)
Abstract
The present invention relates to neutron irradiation technique field, espespecially a kind of shield and its design method applied to neutron scattering chamber；The shield is the neutron absorber being fabricated to using neutron absorber material, neutron absorber is assembled by the inner wall shield and several spatial masking bodies of four irregular shapes, upper wall shield, lower wall shield, left wall shield and right wall shield are separately mounted to scatter intracavitary upper wall, lower wall, left wall and right wall, so that adhering to large area neutron absorber material on scattering cavity wall, wherein design has venthole and groove on upper wall shield and lower wall shield；It is intracavitary that spatial masking body by the groove designed on upper wall shield and lower wall shield is mounted on scattering, and scattering chamber is divided into several different spaces；The interference signal that neutron is formed after spuious by the samples environmental unit such as scattering cavity and high temperature, high pressure and high-intensity magnetic field is successfully eliminated, thus reduces spectrometer back end, improves the degree of purity of neutron scattering data.
Description
Technical field
The present invention relates to neutron irradiation technique field, espespecially a kind of shield and its design side applied to neutron scattering chamber
Method.
Background technique
Neutron scattering is research one of material microstructure and dynamic ideal tools, it have it is not charged, containing magnetic moment, energy
Distinguish isotope, it is sensitive, penetrability is strong to light element the advantages that, have in scientific research and industrial circle many important and irreplaceable
Advantage.With the development of domestic neutron source construction and Neutron scattering technology, the scientific research personnel and engineers and technicians in each field are got over
Come more structures and performance for using Neutron scattering technology test substances, but since neutron has very strong penetration capacity,
It is to work as so carrying out the radiation protection work of neutron ray once leakage will constitute a serious threat to environment and life and health
One of the critical issue in preceding Neutron scattering technology field.
In neutron spectrometer, neutron scattering chamber is normally between sample cavity and detector, and neutron ray removes in sample cavity
It is scattered by sample outer, it is also possible to be scattered by other environment such as high temperature, high pressure, high-intensity magnetic field and structural device, generate spuious letter
Number；Since spurious signal and sample scattered signal cannot be distinguished in detector, when detector receives these spurious signals, can incite somebody to action
It is identified as sample scattered signal, reduces the accuracy and confidence level of experimental data, while increasing subsequent experimental data
Processing difficulty.
Summary of the invention
To solve the above problems, the present invention is intended to provide a kind of Neutron shielding body and its design method, can eliminate neutron quilt
The spuious rear interference signal formed of the samples environmental unit such as cavity and high temperature, high pressure and high-intensity magnetic field is scattered, is neutron shielding
There is provided it is a kind of it is structurally reasonable, assembly is simple, weight is light and is applied to neutron scattering chamber with higher neutron shield effectiveness
Shield and its design method.
The technical solution adopted by the present invention is that: a kind of shield applied to neutron scattering chamber, the shield are to adopt
The neutron absorber being fabricated to neutron absorber material, neutron absorber is by the inner wall shield of four irregular shapes and several
A spatial masking body is assembled, and there are four inner wall shields, offers mounting hole, upper wall shield, lower wall shield, a left side
Wall shield and right wall shield are separately mounted to scatter intracavitary upper wall, lower wall, left wall and right wall, so that on scattering cavity wall
Adhere to large area neutron absorber material, wherein design has venthole and groove on upper wall shield and lower wall shield；Space screen
Covering body, by the groove designed on upper wall shield and lower wall shield to be mounted on scattering intracavitary, and scattering chamber is divided into several
Different spaces.
The back side of the inner wall shield can add transition zone between scattering cavity wall and shield.
The transition zone is aluminium flake or radiation resistance glue-line.
The raw material of the neutron absorber mainly uses neutron absorber material and high molecular material, and wherein neutron-absorbing is former
Material is the material having containing boron material, material containing gadolinium or any one containing cadmium material compared with high neutron absorption section, the high score
Sub- material is thermosetting material or thermoplastic material.
The inner wall shield and spatial masking body uses once molding formed, injection molding or extrusion molding mode system
It is standby.
The thickness of each piece of shield is not less than 2mm in the neutron absorber.
The design scheme includes the assembly of structure design, the preparation of shield and the processing and shield of shield；
The structure of shield designs: according to the shape of neutron scattering chamber, space environment and detector type and layout four
Aspect designs shield, i.e. the quantity of inner wall shield and spatial masking body, shape and size, neutron absorber location layout is answered
It is corresponding with detector blind area, the space exploration other than detector blind area must not be stopped, to avoid the loss of neutron flux, simultaneously
So that the shield after installation is covered with the inner wall of scattering chamber as far as possible；
The preparation and processing of shield: the element or chemical combination with larger neutron absorption cross-section are selected according to the result of design
Matrix of the object as neutron absorber material, mix high molecular material, is prepared by modes such as molding, injection molding or extrusion moldings
Sub- absorber, i.e. inner wall shield and spatial masking body can be placed in corresponding column mould or stick mould in molding, while mold logical
Stomata and groove, can also be molded or extrusion molding after reprocess venthole and groove, after finally being formed to neutron absorber
Processing.
The assembly of shield: according to the layout of design, by the inner wall shield of forming and spatial masking body using bonding
Mode or physics, the mechanical mode combined fixed or be mechanically fixed are mounted on inner wall and the inner space of scattering chamber.
When the inner wall shield adopts the mode being screwed and is assembled to scattering cavity wall, need in inner wall shield and
It scatters the corresponding position of cavity wall and reserves hole location.
Spatial masking body is assembled to when scattering intracavitary and should be installed by the way of line contact or face contact, and is being scattered
The groove endface merging solid-state glue or aluminium flake of chamber are stopped, to prevent spatial masking body from the intracavitary landing of scattering.
When the neutron absorber does neutron absorber material using ceramics, splices or need to splice using the fissure of displacement when installing
Mode assembled, to avoid generate neutron penetrate vertical masonry joint.
The beneficial effects of the present invention are: to be mainly used in neutron scattering intracavitary for shield of the invention, successfully eliminate
The interference signal that son is formed after spuious by the samples environmental unit such as scattering cavity and high temperature, high pressure and high-intensity magnetic field, thus reduce
Spectrometer back end improves the degree of purity of neutron scattering data；The configuration of the present invention is simple, it is easy for installation, it can be according to the knot of scattering chamber
Structure and shape are designed, design, prepare and assemble it is all relatively easy flexibly, and shield effectiveness with higher and stabilization
Property.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of neutron scattering chamber.
Fig. 2 is to cooperate the structural schematic diagram that the neutron absorber that chamber uses is scattered in Fig. 1.
Fig. 3 is the assembly structure diagram of shield and scattering chamber.
Fig. 4 is the structural schematic diagram of upper wall shield or lower wall shield in the present invention.
Fig. 5 is the structural schematic diagram of left wall shield or right wall shield in the present invention.
Attached drawing mark explanation: 1- scattering chamber, 11- upper wall, 12- lower wall, 13- left wall, 14- right wall, 2- neutron absorber,
21- spatial masking body, 22- upper wall shield, 23- lower wall shield, 24 left wall shields, 25- right wall shield, 3- installation
Hole, 4- venthole, 5- groove.
Specific embodiment
The specific embodiment of the present embodiment is described in detail below in conjunction with Figure of description:
As shown in Figs. 1-5, a kind of shield applied to neutron scattering chamber 1, the shield are using neutron-absorbing
The neutron absorber 2 that material is fabricated to, neutron absorber 2 by four irregular shapes inner wall shield and several space screens
It covers body 21 to be assembled, there are four inner wall shields, offers mounting hole 3, upper wall shield 22, lower wall shield 23, a left side
Wall shield 24 and right wall shield 25 are separately mounted to upper wall 11, lower wall 12, left wall 13 and right wall 14 in scattering chamber 1, make
Attachment large area neutron absorber material must be scattered on 1 inner wall of chamber, wherein designing on upper wall shield 22 and lower wall shield 23 has
Venthole 4 and groove 5；Spatial masking body 21 is mounted on by the groove 5 designed on upper wall shield 22 and lower wall shield 23
It scatters in chamber 1, scattering chamber 1 is divided into several different spaces；More particularly inner wall shield and spatial masking body 21
Shape, quantity and size are determined according to the shape and demand of scattering chamber 1.
The back side of the inner wall shield can add transition zone between scattering 1 inner wall of chamber and shield, to increase screen
The strength and stability for covering body is equivalent to more one layer of transition zone between wall and shield in the cavity, but must not shield
Any transition zone or fixing layer are added in the upper surface of body, otherwise can introduce more neutron interference signals, the transition zone is
Aluminium flake or radiation resistance glue-line.
The raw material of the neutron absorber 2 mainly uses neutron absorber material and high molecular material, wherein neutron-absorbing
Raw material is containing boron material, material containing gadolinium or containing any material having compared with high neutron absorption section such as cadmium material, to reach
Optimal neutron shield effect, the content of neutron-absorbing element is not less than 60Wt% in shield；The high molecular material is heat
Thermoset material or thermoplastic material；With neutron absorber material doping high molecular material production inner wall shield and spatial masking body
When 21, can use once molding formed or injection molding, can also machine-shaping otherwise, molding simultaneously or molding it is laggard
The processing of row shape, venthole 4, mounting hole 3 and groove 5, including the aftertreatment technologies such as slot, polish.
The thickness of each piece of shield is not less than 2mm in the neutron absorber 2, to reach best neutron shield effect.
A kind of design method of the shield applied to neutron scattering chamber 1, the design scheme include the knot of shield
The assembly of structure design, the preparation of shield and processing and shield.
The structure of shield designs: according to the shape of neutron scattering chamber 1, space environment and detector type and layout four
Aspect designs shield, the i.e. quantity of inner wall shield and spatial masking body 21, shape and size, 2 position cloth of neutron absorber
Office should be corresponding with detector blind area, must not stop the space exploration other than detector blind area, to avoid the loss of neutron flux,
Shield after making installation simultaneously is covered with the inner wall of scattering chamber 1 as far as possible；More specifically, the shield in the present embodiment
Structure design will comprehensively consider four shape of neutron scattering chamber 1, the type of space environment and detector and layout aspects, set
The Neutron shielding body of meter should be covered with the inner wall of scattering chamber 1 as far as possible, and thickness is moderate, must not excessively occupy the interior of scattering chamber 1
Portion space, designed Neutron shielding body should have the ability for adapting to scattering 1 internal environment of chamber, for example, if scattering chamber 1 is high temperature
Environment should then design shield resistant to high temperature；If scattering chamber 1 is vacuum environment, the screen for having vacuum service performance should be designed
Body is covered, while designed Neutron shielding body should be corresponding with detector type, if detector, which does not have, distinguishes gamma rays
Ability, then need to avoid using with the biggish shield of gamma yield secondary after neutron reaction.Designed neutron shield body position
Layout should be corresponding with detector blind area, must not stop the space exploration other than detector blind area, to avoid the damage of neutron flux
It loses.
The preparation and processing of shield: the element or chemical combination with larger neutron absorption cross-section are selected according to the result of design
Matrix of the object as neutron absorber material, mix high molecular material, is prepared by modes such as molding, injection molding or extrusion moldings
Every piece of shield of sub- absorber 2, i.e. inner wall shield and spatial masking body 21, can be in molding while or molding post-processing ventilation
Hole 4 and groove 5, finally carry out molding post-processing to neutron absorber 2；Wherein, the shield can be flexible, can also
To be heat cured, and the content of neutron-absorbing element is not less than 60Wt%；Side of the shield according to molding or injection molding
Formula preparation, then after shield die sinking, shape of product and size should meet the needs of neutron scattering chamber 1, must not carry out secondary add
Work, to avoid new impurity is introduced；The shield is if flexible elastomer, then shield can carry out secondary operation, but institute
It should easily be obtained with machining tool, and new impurity must not be introduced.More specifically, Neutron shielding body described in the present embodiment can
It voluntarily prepares, is processed again after efficient neutron absorber material can also be purchased；If voluntarily preparing, molding, injection molding can be used
Or the modes such as extrusion are processed, the Neutron shielding body in the present embodiment is molding preparation, and neutron shield substance used is to be carbonized
Boron, accounting 91Wt% insert mold with the resin and curing agent of 9 Wt% after mixing, and moulding by casting is opened after the completion of solidification
Mould, and sand paper sharpened edge burr by hand are subsequently placed with for use, and preparation process is simple, low in cost.Except boron carbide-based resin
Outside composite material, rare earth element or its compound, elemental lithium or its compound etc. is also can be selected in the present embodiment substrate, and additive is also
The materials such as aluminium alloy, rubber, silica gel or polyethylene can be selected.
The assembly of shield: according to the layout of design, by the inner wall shield of forming and spatial masking body 21 using viscous
Tie mode or physics fixed or be mechanically fixed, the mechanical mode combined is mounted on the inner wall for scattering chamber 1 and internal sky
Between, but it is not limited to above-described two ways；According to the mode being mechanically fixed, must not be introduced in the upper surface of shield
The metalworks such as more steel bar or aluminum strip are fixed, to avoid new neutron spurious signal, the neutron shield of the present embodiment is introduced
Body with scattering chamber 1 using bonding and be mechanically fixed combine by the way of assembled, first scatter 1 inner wall quadrangle of chamber respectively process
The threaded hole of 1 M4, and corresponding mounting hole 3 is reserved on shield, using aviation-grade structure glue by Neutron shielding body with
Scattering 1 inner wall of chamber is adhesively fixed, and shield and scattering chamber 1 are finally carried out mechanical fasteners with screw；Wherein scattering 1 inner wall of chamber and
Transition zone can be added between inner wall shield, but must not add any transition zone or fixation in the outer surface of inner wall shield
Layer, otherwise can introduce more neutron interference signals.
When inner wall shield, which adopts the mode being screwed, is assembled to scattering 1 inner wall of chamber, in inner wall shield and need to dissipate
It penetrates the corresponding position of 1 inner wall of chamber and reserves hole location；Spatial masking body 21 should be connect when being assembled in scattering chamber 1 using line contact or face
The mode of touching is installed, and is stopped in 5 endface of the groove merging solid-state glue or aluminium flake of scattering chamber 1, to prevent space
Shield 21 slides out of scattering chamber 1.
The neutron absorber 2, especially spatial masking body 21, can be integrated molding, be also possible to pass through muti-piece
The shield of fritter is assembled into an entirety, when doing neutron absorber material using ceramics, splices or needs when installing using wrong
The mode of seam splicing is assembled, to avoid the vertical masonry joint that neutron penetrates is generated.
Heretofore described 1 shield of neutron scattering chamber design can effectively shield the environmental unit in sample cavity
Spurious signal, reduce reach detector stray neutron amount improve the resolution ratio of spectrometer to reduce the back end of spectrometer；Together
When it is of the invention it is reasonable in design, assembly is simple, low in cost, weight is light, and reduces the difficulty of secondary operation, be
Spectrometer provides a kind of shield design method with higher neutron shield effectiveness；Simultaneously in the present invention, neutron absorber material
It is easy to get, can be rare earth element or its compound, can be boron element, elemental lithium or its compound, be also possible to cadmium member
Element or its alloy；The preparation process of Neutron shielding body used in the present invention is simple, flexible and changeable, can be molded or injection molding, can
, can also be with spicing forming type with extrusion molding, and the content of shield element containing neutron-absorbing is high, thickness is most thin to arrive 2mm, saves
The valuable space in 1 inside of neutron scattering chamber.
The above is only presently preferred embodiments of the present invention, is not intended to limit the scope of the present invention, current row
The technical staff of industry can make some deformations and modification, all technologies according to the present invention under the inspiration of the technical program
Essence still falls within the range of technical solution of the present invention to any modification, equivalent variations and modification made by above embodiment
It is interior.
Claims (10)
1. a kind of shield applied to neutron scattering chamber, it is characterised in that: the shield is using neutron absorber material
The neutron absorber being fabricated to, neutron absorber are filled by the inner wall shield of four irregular shapes and several spatial masking bodies
With forming, there are four inner wall shields, offers mounting hole, upper wall shield, lower wall shield, left wall shield and right wall
Shield is separately mounted to scatter intracavitary upper wall, lower wall, left wall and right wall, so that adhering to large area neutron on scattering cavity wall
Absorbing material, wherein design has venthole and groove on upper wall shield and lower wall shield；Spatial masking body passes through upper wall screen
Cover the groove designed on body and lower wall shield be mounted on scattering it is intracavitary, will scattering chamber be divided into several different spaces.
2. a kind of shield applied to neutron scattering chamber according to claim 1, it is characterised in that: the inner wall screen
The back side of body is covered, i.e., adds transition zone between scattering cavity wall and shield.
3. a kind of shield applied to neutron scattering chamber according to claim 2, it is characterised in that: the transition zone
It is aluminium flake or radiation resistance glue-line.
4. a kind of shield applied to neutron scattering chamber according to claim 1, it is characterised in that: the neutron is inhaled
The raw material of acceptor mainly uses neutron absorber material and high molecular material, and wherein neutron-absorbing raw material is with compared with high neutron absorption
The material in section, the high molecular material are thermosetting material or thermoplastic material.
5. a kind of shield applied to neutron scattering chamber according to claim 1 or 4, it is characterised in that: described is interior
Wall shield and spatial masking body are prepared using once molding formed, injection molding or extrusion molding mode.
6. a kind of shield applied to neutron scattering chamber according to claim 1, it is characterised in that: the neutron is inhaled
The thickness of each piece of shield is not less than 2mm in acceptor.
7. a kind of design method of the shield applied to neutron scattering chamber, it is characterised in that: the design scheme includes screen
Cover the assembly of structure design, the preparation of shield and the processing and shield of body；
The structure of shield designs: according to the shape of neutron scattering chamber, space environment and detector type and four aspects of layout
Shield is designed, i.e., the quantity of inner wall shield and spatial masking body, shape and size, neutron absorber location layout should be with spies
It is corresponding to survey device blind area, the space exploration other than detector blind area must not be stopped, to avoid the loss of neutron flux, made simultaneously
Shield after installation is covered with the inner wall of scattering chamber as far as possible；
The preparation and processing of shield: the element with larger neutron absorption cross-section or compound is selected to make according to the result of design
For the matrix of neutron absorber material, high molecular material is mixed, neutron-absorbing is prepared by molding, injection molding or extrusion molding mode
Body, i.e. inner wall shield and spatial masking body, can molding when be placed in corresponding column mould or stick mould, while mold venthole and
Venthole and groove are reprocessed after groove, or injection molding or extrusion molding, and molding post-processing finally is carried out to neutron absorber;
The assembly of shield: according to the layout of design, the inner wall shield of forming and spatial masking body is used and are adhesively fixed
Or mode or physics, the mechanical mode combined being mechanically fixed are mounted on inner wall and the inner space of scattering chamber.
8. a kind of design method of shield applied to neutron scattering chamber according to claim 7, it is characterised in that: institute
The inner wall shield stated adopt the mode being screwed be assembled to scattering cavity wall when, need to inner wall shield and scattering cavity wall
Reserve hole location in corresponding position.
9. a kind of design method of shield applied to neutron scattering chamber according to claim 7, it is characterised in that: empty
Between shield be assembled to scattering it is intracavitary when should using line contact or face contact by the way of be installed, and scatter chamber groove end
Face is disposed to be stopped into solid-state glue or aluminium flake, to prevent spatial masking body from the intracavitary landing of scattering.
10. a kind of design method of shield applied to neutron scattering chamber according to claim 1 or claim 7, feature exist
In: when the neutron absorber does neutron absorber material using ceramics, splice or need when installing the side using fissure of displacement splicing
Formula is assembled, to avoid the vertical masonry joint that neutron penetrates is generated.
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| CN113884520A (en) * | 2021-09-24 | 2022-01-04 | 中国原子能科学研究院 | Storage testing device for neutron scattering test sample |
| CN114199913B (en) * | 2021-12-06 | 2023-10-20 | 散裂中子源科学中心 | Superconducting magnet structure for neutron scattering experiment |
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|---|---|---|---|---|
| US5887042A (en) * | 1996-07-25 | 1999-03-23 | Kabushiki Kaisha Kobe Seiko Sho | Cask for a radioactive material and radiation shield |
| JP2000221296A (en) * | 1999-01-29 | 2000-08-11 | Mitsubishi Heavy Ind Ltd | Radiation shield device |
| CN201655345U (en) * | 2010-04-01 | 2010-11-24 | 北京市射线应用研究中心 | Mobile type neutron source shielding body |
| CN101916602A (en) * | 2010-07-13 | 2010-12-15 | 浙江博凡动力装备有限公司 | Spent fuel storage device |
| CN106782728A (en) * | 2016-12-29 | 2017-05-31 | 中科瑞华原子能源技术有限公司 | A kind of movable box type combines shielding harness |
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