CN106199681A - A kind of nuclear reaction radiation conversion target and preparation method thereof and a kind of offset-type neutron detector - Google Patents
A kind of nuclear reaction radiation conversion target and preparation method thereof and a kind of offset-type neutron detector Download PDFInfo
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- CN106199681A CN106199681A CN201610478698.7A CN201610478698A CN106199681A CN 106199681 A CN106199681 A CN 106199681A CN 201610478698 A CN201610478698 A CN 201610478698A CN 106199681 A CN106199681 A CN 106199681A
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- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T3/00—Measuring neutron radiation
- G01T3/06—Measuring neutron radiation with scintillation detectors
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Abstract
The invention provides the preparation method of a kind of nuclear reaction radiation conversion target, the preparation method that the present invention provides is workable, can prepare good and stable performance the nuclear reaction of uniformity by shirtsleeve operation step and radiate conversion target.The invention provides a kind of nuclear reaction radiation conversion target, the nuclear reaction radiation conversion target that the present invention provides can realize energy response at fast-neutron range and compensate, it is applied in offset-type neutron detector, be conducive to keeping flatter energy response, higher neutron response and n/ γ resolution capability during neutron inventory is measured, lay a good foundation for accurately measuring the neutron inventory of low intensity pulse neutron source.Theoretical Calculation and test result indicate that, including the offset-type neutron detector of the nuclear reaction radiation conversion target that the present invention provides, neutron energy is when 1～15MeV interval, and its energy response is in the range of 1.01～1.44, and neutron response is 10‑15C cm, n/ γ >=5.
Description
Technical field
The present invention relates to neutron detection technical field, particularly to a kind of nuclear reaction radiation conversion target and preparation method thereof and
A kind of offset-type neutron detector.
Background technology
Neutron inventory measurement is an important content of low intensity pulse radiation detection, during low intensity pulse neutron source has
Sub-intensity is low, neutron energy wide ranges, pulse duration are short, neutron mixes the features such as serious with gamma ray.Therefore essence is wanted
Really measure the neutron inventory of low intensity pulse neutron source, need neutron detector to have higher neutron response, flatter
Energy response, higher n/ γ resolution capability and the performance such as time response faster.In low intensity pulse neutron detection, use
The detector measured in neutron inventory mainly has scintillating-film neutron detector, scintillating fiber array neutron detector, slit
Fission neutron detector and penalty method neutron detector.
Scintillating-film neutron detector be utilize photomultiplier tube detection neutron produce in organic film scintillator anti-
Rush proton excitation scintillator luminescence and realize the measurement to neutron, have that time response is fast, neutron-sensitive relatively advantages of higher.So
And, owing to organic scintillator is high to the luminous efficiency comparison proton of electronics, this makes organic scintillator to gamma-ray sensitivity
The highest, thus its n/ γ resolution capability is the highest.Scintillating fiber array neutron detector is to utilize photomultiplier tube to detect neutron
The recoil proton produced at fibre scintillator excites scintillator luminescence to realize the measurement to neutron, and neutron response is higher, but
It is that its Direction response is the most smooth, causes n/ γ resolution capability the best.Slit fission neutron detector is to utilize PIN to detect
The fission fragment that the fission of neutron fission target produces measures neutron, has the advantage that energy response is smooth.But in order to drop
Low n, γ, directly according to the impact of signal, need that PIN detector deviates radiation channel and arrange, cause detecting a little part
Fission fragment, therefore its neutron response is relatively low, and about 10-17～10-20C cm, it is impossible to meet low intensity pulse neutron irradiation
The measurement requirement of field.
Penalty method neutron detector be the resultant signal electric current utilizing PIN to measure deduct another PIN measure n, γ directly shine
Signal code measures neutron, and what this measuring method was taked is the mode of conversion target+PIN+PIN, and conversion target is generally uranium target
Or polyethylene converter: select uranium target to make conversion target, then there is PIN and the straight of neutron is significantly larger than asking of fission sensitivity according to sensitivity
Topic；Select polyethylene converter to make conversion target, then there is the problem that Direction response is the most smooth.Therefore, in present in prior art
Sub-detector actually can not accurately measure the neutron inventory of low intensity pulse neutron source.
Summary of the invention
It is an object of the invention to provide a kind of nuclear reaction radiation conversion target and preparation method thereof and a kind of offset-type neutron
Detector, offset-type neutron detector prepared by the nuclear reaction radiation conversion target using the present invention to provide has flatter energy
Response, higher neutron response and n/ γ resolution capability, establish for accurately measuring the neutron inventory of low intensity pulse neutron source
Determine basis.
The invention provides the preparation method of a kind of nuclear reaction radiation conversion target, comprise the following steps:
(1) surface of substrate is carried out pretreatment；
(2) coating is coated in described step (1) pretreated substrate surface, described coating include firming agent, resin,
Diluent and boron powder；
(3) substrate after described step (2) coating coating is carried out baking and curing, obtain nuclear reaction radiation conversion target.
Preferably, in step (2) described coating, the mass ratio of firming agent, resin, diluent and boron powder is 1:(2～3): (5
～7): (3～4).
Preferably, described boron powder is amorphous10B powder.
Preferably, described boron powder carries out pretreatment before use, and described pretreatment includes grinding, toasting and secondary grinding.
Preferably, after described pretreatment, the granularity of boron powder is less than 1.0 μm.
Preferably, baking and curing described in step (3) includes that dried and baking process.
Preferably, described baking processes and uses gradient increased temperature mode, and initial temperature is 140～160 DEG C, and outlet temperature is
440～460 DEG C, each increasing extent of temperature is 40～60 DEG C, and after heating up, temperature retention time is 8～12min every time.
The invention provides a kind of nuclear reaction radiation conversion target, including substrate with in the solidification coating of described substrate surface,
The raw material forming described solidification coating includes firming agent, resin, diluent and boron powder.
Preferably, the thickness of described solidification coating is 8～10 μm.
The invention provides a kind of offset-type neutron detector, including4He scintillator, pressure vessel, photomultiplier tube, height
Voltage source and record transmission signalling arrangement, also include the polyethylene core recoil radiation conversion being positioned at outside described pressure vessel entrance window
Target and the nuclear reaction radiation conversion target being positioned at described pressure vessel entrance window, described nuclear reaction radiation conversion target is above-mentioned technology
Nuclear reaction radiation conversion target described in scheme.
The invention provides the preparation method of a kind of nuclear reaction radiation conversion target, first the surface of substrate is carried out pre-place
Reason；Then coating be coated in pretreated substrate surface, and described coating includes firming agent, resin, diluent and boron powder；?
After the substrate after described coating coating is carried out baking and curing, obtain nuclear reaction radiation conversion target.The preparation side that the present invention provides
Method is workable, can prepare good and stable performance the nuclear reaction radiation of uniformity by shirtsleeve operation step and change
Target.
The invention provides a kind of nuclear reaction radiation conversion target and include the solidification coating of substrate and described substrate surface, formed
The raw material of described solidification coating includes firming agent, resin, diluent and boron powder.The nuclear reaction radiation conversion target energy that the present invention provides
Enough realize energy response at fast-neutron range to compensate, be applied in offset-type neutron detector, be conducive to measuring in neutron inventory
During keep flatter energy response, higher neutron response and n/ γ resolution capability, for accurately measuring low-intensity
The neutron inventory of pulsed neutron source is laid a good foundation.Theoretical Calculation and test result indicate that, the nuclear reaction provided including the present invention
The offset-type neutron detector of radiation conversion target, neutron energy is when 1～15MeV interval, and its energy response is 1.01～1.44
In the range of, neutron response is 10-15C cm, n/ γ >=5.
Accompanying drawing explanation
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings.
The structural representation of the offset-type neutron detector that Fig. 1 provides for the embodiment of the present invention 4.
Detailed description of the invention
The invention provides the preparation method of a kind of nuclear reaction radiation conversion target, comprise the following steps:
(1) surface of substrate is carried out pretreatment；
(2) coating is coated in described step (1) pretreated substrate surface, described coating include firming agent, resin,
Diluent and boron powder；
(3) substrate after described step (2) coating coating is carried out baking and curing, obtain nuclear reaction radiation conversion target.
The invention provides the preparation method of a kind of nuclear reaction radiation conversion target, first the surface of substrate is carried out pre-place
Reason；Then coating be coated in pretreated substrate surface, and described coating includes firming agent, resin, diluent and boron powder；?
After the substrate after described coating coating is carried out baking and curing, obtain nuclear reaction radiation conversion target.Use the system that the present invention provides
Preparation Method is obtained in that the preferable nuclear reaction of uniformity radiates conversion target, and the nuclear reaction provided including the present invention radiates conversion target
Offset-type neutron detector has flatter energy response, higher neutron response and n/ γ resolution capability, for accurately
The neutron inventory measuring low intensity pulse neutron source is laid a good foundation.
The present invention carries out pretreatment to the surface of substrate.In the present invention, the thickness of described substrate be preferably 0.8～
1.2mm.The present invention does not has special restriction for the material of described substrate, use well known to those skilled in the art can conduct
The material of the substrate that nuclear reaction radiation conversion target uses.Present invention preferably employs metal substrate.At embodiments of the invention
In, concrete employing aluminium flake is as substrate.The present invention does not has special requirement for the shape of described substrate, adopts according to actual needs
Shape with substrate well known to those skilled in the art.In an embodiment of the present invention, circular substrate is specifically used.At this
In invention, the described surface to substrate carries out pretreatment and preferably includes the surface to substrate and carry out sanding and polishing, clean and dry.
The present invention does not has special restriction for described sanding and polishing, uses sanding and polishing well known to those skilled in the art
Technical scheme.In an embodiment of the present invention, concrete employing 1200 mesh sand paper carry out sanding and polishing to the surface of substrate,
Until smooth surface, impulse-free robustness.
Substrate after sanding and polishing is preferably carried out by the present invention.The present invention does not has special limit for described cleaning
Fixed, use the technical scheme of cleaning well known to those skilled in the art.Present invention preferably employs ethanol to sanding and polishing after
Substrate be carried out, to remove the dust of substrate surface, spot.
Substrate after cleaning preferably is dried by the present invention.The present invention does not has special restriction for described drying, adopts
Technical scheme with drying well known to those skilled in the art.Present invention preferably employs heat gun the substrate after cleaning is entered
Row is dried, until ethanol volatilization is completely.
After completing the pretreatment to substrate, coating is coated in described pretreated substrate surface, described painting by the present invention
Material includes firming agent, resin, diluent and boron powder.In the present invention, firming agent, resin, diluent and boron powder in described coating
Mass ratio be preferably 1:(2～3): (5～7): (3～4), more preferably 1:2:6:3,1:2:6:4,1:3:6:3 or 1:3:6:
4。
In the present invention, described coating includes firming agent, resin, diluent and boron powder.In the present invention, described boron powder is excellent
Elect as amorphous10B powder.Natural boron by10B and11Two kinds of stable isotope compositions of B, natural abundance is respectively 19.3% He
80.7%.10The thermal neutron absorption cross section of B is approximately1180,000 times of B, the absorption cross-section of thermal neutron is only by the boron of natural abundance
750b.In the present invention, for improve thermal neutron with10The reaction cross-section of B, it is preferred to use amorphous10B powder prepares nuclear reaction spoke
Penetrate conversion target.In the present invention, described amorphous10The purity of B powder preferably 95.0%.
In the present invention, described boron powder the most preferably carries out pretreatment, and described pretreatment includes grinding, baking and two
Secondary grinding.The present invention does not has special restriction for described grinding, uses the technical side of grinding well known to those skilled in the art
Case.Present invention preferably employs ball mill described boron powder is ground.In the present invention, described milling time is preferably 20
～30h, more preferably 24～28h.In the present invention, after described grinding, the granularity of boron powder is preferably smaller than 1.0 μm.The present invention is preferred
The granularity of boron powder after using sweep electron microscopic measure to grind, it is ensured that obtain the granularity boron powder less than 1.0 μm.
Boron powder after grinding preferably is toasted by the present invention.In the present invention, the temperature of described baking be preferably 110～
150 DEG C, more preferably 120～135 DEG C；The time of described baking is preferably 0.5～2h, more preferably 1～1.5h.The present invention couple
The equipment used in described baking does not has special restriction, uses the equipment for baking well known to those skilled in the art i.e.
Can.Present invention preferably employs Muffle furnace the boron powder after grinding is toasted.
The present invention preferably carries out secondary grinding to the boron powder after baking.It is special that the present invention does not has for the grinding of described secondary
Limit, use the technical scheme of grinding well known to those skilled in the art.Present invention preferably employs ball mill to described boron
Powder carries out secondary grinding.In the present invention, described secondary milling time is preferably 10～18h, more preferably 12～15h.At this
In invention, after the grinding of described secondary, the granularity of boron powder is preferably smaller than 1.0 μm.Present invention preferably employs sweep electron microscopic measure secondary to grind
The granularity of boron powder after mill, it is ensured that obtain the granularity boron powder less than 1.0 μm.
After described boron powder is carried out pretreatment, the present invention is preferably by pretreated boron powder and firming agent, resin, diluent
Mixing, obtains coating.
The present invention does not has special restriction for described firming agent, uses firming agent well known to those skilled in the art i.e.
Can.In the present invention, described firming agent is preferably amine curing agent, more preferably ethylenediamine or diethylenetriamine.
The present invention does not has special restriction for described resin, uses resin well known to those skilled in the art.?
In the present invention, described resin is preferably epoxy resin, more preferably #601 epoxy resin, #604 epoxy resin or #607 asphalt mixtures modified by epoxy resin
Fat.
The present invention does not has special restriction for described diluent, uses diluent well known to those skilled in the art i.e.
Can.In the present invention, described diluent preferably includes iso-octyl ether, epoxy ethylbenzene or butyl glycidyl ether.
The present invention for described by the most special with the mode that firming agent, resin, diluent mix for pretreated boron powder
Restriction, use the technical scheme of mixing well known to those skilled in the art.The present invention preferably will be pre-under ultrasound condition
Boron powder after process mixes with firming agent, resin, diluent.In the present invention, the described ultrasonic time is preferably 8～12min；
Described ultrasonic power is preferably 18～22kHz.
After obtaining coating, coating is coated in described pretreated substrate surface by the present invention.The present invention is for described painting
The mode covered does not has special restriction, uses the technical scheme of coating well known to those skilled in the art.In the present invention,
The mode of described coating is preferably spraying, specifically can put in spray gun by coating, along clockwise direction, keep injection direction simultaneously
It is 28～32 degree with the plane included angle at described pretreated substrate surface place, carries out to described pretreated substrate surface
Spraying, rotates described pretreated substrate or spray gun in spraying process, so that spraying is uniformly, it is to avoid cause piling and
Subsequent treatment is split.
After completing described coating, the substrate after described coating coating is carried out baking and curing by the present invention, obtains nuclear reaction spoke
Penetrate conversion target.In the present invention, described baking and curing preferably includes dried and baking processes.
The present invention does not has special restriction for described dried, uses and well known to those skilled in the art can will be coated with
Cover the technical scheme that the substrate surface after coating is dried.Present invention preferably employs heat gun and carry out described dry place
Reason, is specifically set as 100～250 DEG C by the temperature of heat gun, the substrate surface distance after hot air gun nozzle and coating coating
It is 5～10cm, carries out the dried of 1～3min.In the present invention, the temperature of described heat gun is preferably 120～210 DEG C,
More preferably 150～180 DEG C.In the present invention, described hot air gun nozzle with coating coating after substrate surface distance preferably 6
～8cm.
After completing described dried, the substrate being coated with coating after described dried is preferably dried by the present invention
Roasting process.In the present invention, described baking processes and preferably employs gradient increased temperature mode, prevents temperature from raising suddenly, causes substrate
The coating of surface-coated splits.In the present invention, in described gradient increased temperature mode, initial temperature is preferably 140～160 DEG C, more excellent
Elect 145～155 DEG C as；Outlet temperature is preferably 440～460 DEG C, more preferably 445～455 DEG C；The amplitude every time heated up is preferred
It is 40～60 DEG C, more preferably 45～55 DEG C；Heat up every time after temperature retention time be preferably 8～12min, more preferably 9～
11min.The present invention processes, for described baking, the equipment used does not has special restriction, uses those skilled in the art to know
For carrying out the equipment of baking process.Present invention preferably employs Muffle furnace and carry out described baking process.
In actual applications, as required the nuclear reaction containing monolayer immobilization coating can be radiated conversion target and proceed many
Layer coating, coats each layer and need to be coated successively and baking and curing step, obtain the nuclear reaction spoke containing multiple layers of cured coating
Penetrate conversion target.
After preparing nuclear reaction radiation conversion target, nuclear reaction is preferably radiated conversion target and is packaged stand-by by the present invention,
In order to not damage the solidification coating of nuclear reaction radiation conversion target, specifically can be by the solidification coat side of two pieces of nuclear reaction radiation conversion targets
Staggered relatively, centre plastic hoop separates, and then wraps with preservative film, and blend compounds band is wound around and is packaged；Described plastic hoop is thick
Degree is preferably 8～12mm, and external diameter is suitable with nuclear reaction radiation conversion target size, and it is 6～10mm that internal-and external diameter preferably differs.
The invention provides a kind of nuclear reaction radiation conversion target, including the solidification coating of substrate and described substrate surface, shape
The raw material becoming described solidification coating includes firming agent, resin, diluent and boron powder.In the present invention, the thickness of described solidification coating
Degree is preferably 8～10 μm.In the present invention, in described solidification coating, boron powder content is preferably 68%～78%.In the present invention,
Described nuclear reaction radiation conversion target preferably employs preparation method described in technique scheme and prepares.
In the present invention, described nuclear reaction radiates the solidification coating layer thickness of conversion target and solidifies the equal energy of boron powder content in coating
Enough realization accurately controls, and in described solidification coating layer thickness and solidification coating, the method for testing of boron powder content specifically includes following step
Rapid:
A firming agent, resin and diluent in coating are carried out baking process by () respectively, calculate firming agent, resin in coating
With the mass excess rate of diluent, described mass excess rate is quality difference and baking matter before treatment before and after described baking processes
Amount ratio；
B () is b by the mass ratio of firming agent, resin, diluent and boron powder in coating1: b2: b3: b4Meter, prepares core
Reaction radiation conversion target；
C () formula as shown in Formulas I calculates, obtain solidifying coating layer thickness；As shown in Formula II, formula calculates, and obtains solidifying coating
Middle boron powder content；
Wherein, h is the solidification coating layer thickness of nuclear reaction radiation conversion target,
M is the quality of nuclear reaction radiation conversion target,
M is pretreated substrate quality,
a1、a2And a3It is respectively firming agent, resin and the mass excess rate of diluent in coating,
ρ is the density of boron powder in coating,
S is pretreated chip area,
X be nuclear reaction radiation conversion target solidification coating in boron powder content.
In the present invention, firming agent, resin and diluent in coating are carried out baking process by step (a) respectively, calculate
The mass excess rate of firming agent, resin and diluent in coating, described mass excess rate is of poor quality before and after described baking processes
Value and baking mass ratio before treatment.In the present invention, described baking processes preferably by firming agent, resin and diluent in coating
Respectively 230～250 DEG C be incubated 10～15min, 380～400 DEG C be incubated 10～15min, 430～450 DEG C insulation 10～
15min。
The invention provides a kind of offset-type neutron detector, including4He scintillator, pressure vessel, photomultiplier tube, height
Voltage source and record transmission signalling arrangement, also include the polyethylene core recoil radiation conversion being positioned at outside described pressure vessel entrance window
Target and the nuclear reaction radiation conversion target being positioned at described pressure vessel entrance window, described nuclear reaction radiation conversion target is above-mentioned technology
Nuclear reaction radiation conversion target described in scheme.
The offset-type neutron detector that the present invention provides includes pressure vessel.The present invention is for the material of described pressure vessel
There is no special restriction, use the material that can be used in preparing pressure vessel well known to those skilled in the art.The present invention
Preferably employ stainless steel material and prepare pressure vessel, to ensure that the pressure in pressure vessel is able to maintain that stable.The present invention for
The shape of described pressure vessel does not has special requirement, uses the shape of pressure vessel well known to those skilled in the art.
Present invention preferably employs cylindrical pressure vessel, to realize optimal resistance to compression effect.
The offset-type neutron detector that the present invention provides includes being placed in pressure vessel4He scintillator.In the present invention,
Described4The purity of He is preferably >=99.99%.Helium (4He) it is the gas scintillator that a kind of luminous efficiency is higher, and gas density
Little, have little with gamma-rays action section, the features such as gamma-ray sensitivity is relatively low, and time response is fast are serious in n/ γ mixing
Low intensity pulse fission neutron measure in, select4He, as scintillator, is conducive to making offset-type neutron detector have higher
Sensitivity and preferable n/ γ resolution capability.
The offset-type neutron detector that the present invention provides is included in outside pressure vessel entrance window the polyethylene core recoil placed
Radiation conversion target.Present invention preferably employs pure polyethylene and prepare described polyethylene core recoil radiation conversion target.
The nuclear reaction radiation that the offset-type neutron detector that the present invention provides is placed in being included in pressure vessel entrance window turns
Change target.In the present invention, described nuclear reaction radiation conversion target preferably employs the nuclear reaction spoke that technique scheme of the present invention provides
Penetrate conversion target.
The offset-type neutron detector that the present invention provides includes the photomultiplier tube connected outside pressure vessel exit window.At this
In invention, described photomultiplier tube preferably employs ET company of Britain and produces, and model is the photomultiplier tube of 9215SB, spectral region
Being 290～630nm, gain is 106。
The offset-type neutron detector that the present invention provides includes the record transmission signalling arrangement being connected with photomultiplier tube.This
Invent and special requirement is not had for described record transmission signalling arrangement, use record transmission letter well known to those skilled in the art
Number equipment.Present invention preferably employs galvanometer or oscillograph recording transmission signal.
The offset-type neutron detector that the present invention provides includes high voltage power supply.The present invention does not has spy for described high voltage power supply
Different requirement, uses high voltage power supply well known to those skilled in the art.In the present invention, the output electricity of described high voltage power supply
Pressure is preferably ± 5～± 50kV；The maximum current of described high voltage power supply is preferably 5mA.The present invention is for described high voltage power supply
Connected mode does not has special requirement, uses the connected mode of high voltage power supply well known to those skilled in the art.The present invention
Preferably described high voltage power supply is connected with described photomultiplier tube.
The principle of the neutron inventory that low intensity pulse neutron source measured by the offset-type neutron detector that the present invention provides is:
In low intensity pulse Neutron Radiation Field, in the offset-type neutron detector that the neutron streaming incidence present invention provides, neutron and poly-second
Alkene uclear recoil radiation conversion target in proton and4Helion generation elastic scattering in He scintillator produces recoil proton and recoil helium
Core, transfers to the part energy of incident neutron recoil on proton and recoil helion；Neutron radiates in conversion target with nuclear reaction
's10B occurs nuclear reaction to generate4He and7Li, transfers to product by the part energy of incident neutron4He and7On Li；Core is anti-
With the charged particle that uclear recoil produces, energy deposition should be arrived4In He scintillator, excite4He is luminous, then receives with photomultiplier tube
Collection optical signal, and by galvanometer or the output signal of oscillograph recording photomultiplier tube, thus realize the measurement to neutron.This
The offset-type neutron detector of bright offer, 1～15MeV energy response is in the range of 1.01～1.44, and neutron response is 10- 15C cm, n/ γ >=5, illustrate to include that the offset-type neutron detector of the nuclear reaction radiation conversion target that the present invention provides has more flat
Smooth energy response, higher neutron response and n/ γ resolution capability, for accurately measuring in low intensity pulse neutron source
Sub-sum is laid a good foundation.
Below in conjunction with the embodiment in the present invention, the technical scheme in the present invention is clearly and completely described.Aobvious
So, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the reality in the present invention
Execute example, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, all belong to
In the scope of protection of the invention.
Embodiment 1:
(1) with thickness as 1mm, the circular aluminium flake of a diameter of 50mm as substrate, use the 1200 mesh sand paper table to aluminium substrate
Face carries out sanding and polishing, until smooth surface, impulse-free robustness；Then use ethanol that the aluminium substrate after sanding and polishing is carried out,
To remove the dust on surface, spot；Then use heat gun that the substrate after cleaning is dried, until ethanol volatilization is completely.
(2) use ball mill by amorphous10B powder mull 20h, the granularity of boron powder after using sweep electron microscopic measure to grind,
Ensure the boron powder obtaining granularity less than 1.0 μm, gained granularity toasted 2h in 110 DEG C less than the boron powder of 1.0 μm in Muffle furnace,
Then the boron powder secondary after using ball mill baking to be processed grinds 18h, boron powder after using sweep electron microscopic measure secondary to grind
Granularity, it is ensured that obtain the granularity boron powder less than 1.0 μm, is less than boron powder and ethylenediamine, the #601 asphalt mixtures modified by epoxy resin of 1.0 μm by gained granularity
Fat, iso-octyl ether mix, and obtain coating；Described in coating amorphous10B powder and ethylenediamine, #601 epoxy resin, iso-octyl ether
Mass ratio be 3:1:2:5, described in be blended in ultrasonic 8min under 20kHz ultrasonic power.
(3) coating that step (2) obtains is put in spray gun, along clockwise direction, keep injection direction and step simultaneously
(1) plane included angle at place, pretreated aluminium substrate surface is 30 degree, sprays to described pretreated aluminium substrate surface
It is coated with.
(4) aluminium substrate after described step (3) coating coating is carried out baking and curing, obtain nuclear reaction radiation conversion target；
The aluminium substrate specifically using heat gun to be coated with coating is dried process, and the temperature of described heat gun is set as 100 DEG C,
Substrate surface distance after hot air gun nozzle and coating coating is 5cm, and the dried time is 3min；Use gradient increased temperature mode
The aluminium substrate being coated with coating after dried is placed in Muffle furnace and carries out baking process, described gradient increased temperature mode rises
Beginning temperature is 150 DEG C, and outlet temperature is 450 DEG C, and each increasing extent of temperature is 50 DEG C, and after heating up, temperature retention time is 10min every time.
Embodiment 2:
(1) with thickness as 0.8mm, the circular aluminium flake of a diameter of 50mm as substrate, use 1200 mesh sand paper to aluminium substrate
Surface carries out sanding and polishing, until smooth surface, impulse-free robustness；Then use ethanol that the aluminium substrate after sanding and polishing is carried out clearly
Wash, to remove the dust on surface, spot；Then heat gun is used to dry, the substrate after cleaning until ethanol is evaporated completely
Entirely.
(2) use ball mill by amorphous10B powder mull 30h, the granularity of boron powder after using sweep electron microscopic measure to grind,
Ensure the boron powder obtaining granularity less than 1.0 μm, gained granularity is less than the boron powder of 1.0 μm in Muffle furnace in 150 DEG C of bakings
0.5h, the boron powder secondary after then using ball mill baking to be processed grinds 10h, boron after using sweep electron microscopic measure secondary to grind
The granularity of powder, it is ensured that obtain the granularity boron powder less than 1.0 μm, is less than boron powder and diethylenetriamine, the # of 1.0 μm by gained granularity
604 epoxy resin, epoxy ethylbenzene mix, and obtain coating；Described in coating amorphous10B powder and diethylenetriamine, #604 ring
Epoxy resins, the mass ratio of epoxy ethylbenzene are 4:1:3:7, described in be blended in ultrasonic 10min under 22kHz ultrasonic power.
(3) coating that step (2) obtains is put in spray gun, along clockwise direction, keep injection direction and step simultaneously
(1) plane included angle at place, pretreated aluminium substrate surface is 30 degree, sprays to described pretreated aluminium substrate surface
It is coated with.
(4) aluminium substrate after described step (3) coating coating is carried out baking and curing, obtain nuclear reaction radiation conversion target；
The aluminium substrate specifically using heat gun to be coated with coating is dried process, and the temperature of described heat gun is set as 250 DEG C,
Substrate surface distance after hot air gun nozzle and coating coating is 10cm, and the dried time is 1min；Use gradient increased temperature side
The aluminium substrate being coated with coating after dried is placed in Muffle furnace and carries out baking process, in described gradient increased temperature mode by formula
Initial temperature is 150 DEG C, and outlet temperature is 450 DEG C, and each increasing extent of temperature is 50 DEG C, and after heating up, temperature retention time is 8min every time.
Embodiment 3:
(1) with thickness as 1.2mm, the circular aluminium flake of a diameter of 50mm as substrate, use 1200 mesh sand paper to aluminium substrate
Surface carries out sanding and polishing, until smooth surface, impulse-free robustness；Then use ethanol that the aluminium substrate after sanding and polishing is carried out clearly
Wash, to remove the dust on surface, spot；Then heat gun is used to dry, the substrate after cleaning until ethanol is evaporated completely
Entirely.
(2) use ball mill by amorphous10B powder mull 25h, the granularity of boron powder after using sweep electron microscopic measure to grind,
Ensure the boron powder obtaining granularity less than 1.0 μm, gained granularity is less than the boron powder of 1.0 μm in Muffle furnace in 120 DEG C of bakings
1.5h, the boron powder secondary after then using ball mill baking to be processed grinds 14h, boron after using sweep electron microscopic measure secondary to grind
The granularity of powder, it is ensured that obtain the granularity boron powder less than 1.0 μm, is less than boron powder and diethylenetriamine, the # of 1.0 μm by gained granularity
607 epoxy resin, butyl glycidyl ether mix, and obtain coating；Described in coating amorphous10B powder and diethylenetriamine, #
607 epoxy resin, the mass ratio of butyl glycidyl ether are 4:1:2:6, described in be blended under 18kHz ultrasonic power ultrasonic
12min。
(3) coating that step (2) obtains is put in spray gun, along clockwise direction, keep injection direction and step simultaneously
(1) plane included angle at place, pretreated aluminium substrate surface is 30 degree, sprays to described pretreated aluminium substrate surface
It is coated with.
(4) aluminium substrate after described step (3) coating coating is carried out baking and curing, obtain nuclear reaction radiation conversion target；
The aluminium substrate specifically using heat gun to be coated with coating is dried process, and the temperature of described heat gun is set as 160 DEG C,
Substrate surface distance after hot air gun nozzle and coating coating is 8cm, and the dried time is 2min；Use gradient increased temperature mode
The aluminium substrate being coated with coating after dried is placed in Muffle furnace and carries out baking process, described gradient increased temperature mode rises
Beginning temperature is 150 DEG C, and outlet temperature is 450 DEG C, and each increasing extent of temperature is 50 DEG C, and after heating up, temperature retention time is 12min every time.
Embodiment 4
The nuclear reaction radiation conversion target using embodiment 1 to prepare prepares offset-type neutron detector, described offset-type
Neutron detector includes4He scintillator, pressure vessel, polyethylene core recoil radiation conversion target, nuclear reaction radiation conversion target, photoelectricity
Multiplier tube, high voltage power supply and record transmission signalling arrangement, structure is as shown in Figure 1.
Use and cover card program MCNPX and theorize calculating mould based on the offset-type neutron detector structure that the present invention provides
Type, the neutron for different-energy carries out energy response simulation calculating.Result of calculation shows, the offset-type neutron that the present invention provides
Detector is when neutron energy is 1～15MeV, and energy response is in the range of 1.01～1.44.
The pulsed reactor offset-type neutron detector that radially present invention is provided by duct and plume duct in Xi'an is utilized to enter
Row neutron response test experiments, under conditions of reactor steady state power 2MW, the offset-type neutron detector that the present invention provides
Neutron response be 10-15C·cm。
Utilizing the γ sensitivity of the offset-type neutron detector of cobalt source, caesium source test present invention offer, result shows this
N/ γ >=5 of the offset-type neutron detector of bright offer.
As can be seen from the above embodiments, the preparation method using the present invention to provide is obtained in that the preferable core of uniformity is anti-
Should radiate conversion target, the offset-type neutron detector of the nuclear reaction radiation conversion target provided including the present invention has flatter energy
Amount response, higher neutron response and n/ γ resolution capability, for accurately measuring the neutron inventory of low intensity pulse neutron source
Lay a good foundation.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a preparation method for nuclear reaction radiation conversion target, comprises the following steps:
(1) surface of substrate is carried out pretreatment；
(2) coating being coated in described step (1) pretreated substrate surface, described coating includes firming agent, resin, dilution
Agent and boron powder；
(3) substrate after described step (2) coating coating is carried out baking and curing, obtain nuclear reaction radiation conversion target.
Preparation method the most according to claim 1, it is characterised in that firming agent in step (2) described coating, resin, dilute
The mass ratio releasing agent and boron powder is 1:(2～3): (5～7): (3～4).
Preparation method the most according to claim 1 and 2, it is characterised in that described boron powder is amorphous10B powder.
Preparation method the most according to claim 3, it is characterised in that described boron powder carries out pretreatment before use, described
Pretreatment includes grinding, toasting and secondary grinding.
Preparation method the most according to claim 4, it is characterised in that after described pretreatment, the granularity of boron powder is less than 1.0 μm.
Preparation method the most according to claim 1, it is characterised in that baking and curing described in step (3) includes being dried place
Reason and baking process.
Preparation method the most according to claim 6, it is characterised in that described baking processes and uses gradient increased temperature mode, rises
Beginning temperature is 140～160 DEG C, and outlet temperature is 440～460 DEG C, and each increasing extent of temperature is 40～60 DEG C, is incubated after heating up every time
Time is 8～12min.
8. a nuclear reaction radiation conversion target, it is characterised in that include the solidification coating of substrate and described substrate surface, form institute
The raw material stating solidification coating includes firming agent, resin, diluent and boron powder.
Nuclear reaction the most according to claim 8 radiation conversion target, it is characterised in that the thickness of described solidification coating be 8～
10μm。
10. an offset-type neutron detector, including4He scintillator, pressure vessel, photomultiplier tube, high voltage power supply and record pass
Defeated signalling arrangement, it is characterised in that also include the polyethylene core recoil radiation conversion target being positioned at outside described pressure vessel entrance window
Radiating conversion target with the nuclear reaction being positioned at described pressure vessel entrance window, described nuclear reaction radiation conversion target is claim 8
Or the nuclear reaction radiation conversion target described in 9.
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| CN110467865A (en) * | 2018-05-09 | 2019-11-19 | 同方威视技术股份有限公司 | A kind of painting boron method |
| CN114236600A (en) * | 2021-11-25 | 2022-03-25 | 西北核技术研究所 | Neutron beam monitoring system based on silicon carbide detector |
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