CN204166139U - Neutron two-dimensional position detector - Google Patents
Neutron two-dimensional position detector Download PDFInfo
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- CN204166139U CN204166139U CN201420489372.0U CN201420489372U CN204166139U CN 204166139 U CN204166139 U CN 204166139U CN 201420489372 U CN201420489372 U CN 201420489372U CN 204166139 U CN204166139 U CN 204166139U
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- neutron
- dimensional position
- position detector
- electrooptical device
- shifting fiber
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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 utility model provides a kind of neutron two-dimensional position detector, and described neutron two-dimensional position detector comprises: neutron-sensitive scintillator; Ripple shifting fiber array, is arranged on the below of described neutron-sensitive scintillator, for collecting the passage of scintillation light that described neutron-sensitive scintillator produces; Electrooptical device, one end of described electrooptical device connects described ripple shifting fiber array, other end connection signal output port, the passage of scintillation light described in described electrooptical device receives, and exported by described signal output port after described passage of scintillation light being carried out opto-electronic conversion.Neutron two-dimensional position detector of the present utility model is when realizing large area neutron position sensing, turn in the one end that fiber array can be connected with electrooptical device, to reduce the detection dead band of detector, the mode simultaneously utilizing multiple small size neutron two-dimensional position detector to splice, can realize large area neutron position sensing.
Description
Technical field
The utility model is about neutron detection technology, particularly about a kind of neutron two-dimensional position detector.
Background technology
Neutron and X ray are all effective probes that the mankind explore material microstructure.After English physicist Chadwick (J.Chadwick) found neutron in 1932, the application of neutron and Neutron scattering technology makes people make rapid progress to the understanding of material microstructure.Different from X ray, neutron is not charged, can penetrating electrons layer easily, and with atomic nucleus generation nuclear reaction, its mass attenuation coefficient is relevant with the atomic nucleus cross section of material with incident neutron energy.Therefore, the son that can be right is the desirable probe studying the structure of matter and kinetic property at present.Neutron scattering technology utilizes the wavelength of low energy neutron close with atomic distance, and the feature that simultaneously energy of thermal motion of energy and atom, molecule is about the same, studies the structure of matter and motion state.Neutron after scattering needs to receive, to obtain the shooting angle of scattered neutron, for amalyzing substances structure provides effective information with location-sensitive neutron detector.This requires that neutron detector has some performance following: high count rate, High detect efficiency, large solid angle, high position precision and high n/ γ rejection ratio.
Neutron detector conventional on the market at present, mainly
3he type gas detector, as the hyperbar that GE Energy company of the U.S. produces
3he position sensing proportional counter.In recent years because anti-terrorism situation needs and the whole world
3the scarcity of He, makes
3he big bulge in price, nearly 3 years
3he gas price amount of increase more than 20 times, based on
3the neutron detector of He is also just very expensive.With 1 inch atmospheric pressure
3he position sensing proportional counter is example, current quotation more than 100,000 Renminbi, the 1m of such
2detector array cost is more than 3,000,000.
For meeting various science needs, new neutron detector being is all is being researched and developed to substitute in many laboratories
3he type neutron detector, as semiconductor neutron detector, is coated with boron GEM neutron detector.These detectors are all in development, and the subject matter faced is that neutron detection efficiency is low, and n/ γ rejection ratio is not high, is limited to the problem of technological layer simultaneously, and its critical component involves great expense equally.Scintillator detector developed comparative maturity in recent years, for the New Scintillators of neutron detection.Mainly reach its maturity based on manufacturing process on the market, mix the scintillator of neutron-sensitive material, itself and neutron reaction, produce passage of scintillation light, utilize the detection that electrooptical device realizes neutron.
But based on the detector of neutron-sensitive scintillator, it realizes mainly through rear end electrooptical device at present to the detection of neutron position, as utilized photomultiplier or the CCD camera of band position resolution, these equipment manufacturing cost are expensive, are difficult to realize large-area neutron position sensing simultaneously.
Utility model content
The utility model provides a kind of neutron two-dimensional position detector, with improve positioning precision high, realize large-area manufacturing, reduce costs simultaneously.
To achieve these goals, the utility model provides a kind of neutron two-dimensional position detector, and described neutron two-dimensional position detector comprises:
Neutron-sensitive scintillator, the lower surface of described neutron-sensitive scintillator scribbles aluminium base;
Ripple shifting fiber array, is arranged on the below of described neutron-sensitive scintillator, for collecting the passage of scintillation light that described neutron-sensitive scintillator produces;
Electrooptical device, one end of described electrooptical device connects described ripple shifting fiber array, other end connection signal output port, the passage of scintillation light described in described electrooptical device receives, and exported by described signal output port after described passage of scintillation light being carried out opto-electronic conversion.
In one embodiment, described ripple shifting fiber array is made up of the mutually perpendicular ripple shifting fiber of two-layer arragement direction, and the passage of scintillation light of collecting described neutron-sensitive scintillator is respectively in the distribution of X and Y-direction; One end of every layer of described ripple shifting fiber connects described electrooptical device, and the other end is coated with reflecting material.
In one embodiment, described ripple shifting fiber has sandwich layer and covering, comprises ripple and move material in described sandwich layer.
In one embodiment, described ripple shifting fiber is by light-guide material or the electrooptical device described in Air Coupling.
In one embodiment, one end that described ripple shifting fiber is connected with electrooptical device has a kink.
In one embodiment, the spacing between two-layer described ripple shifting fiber is 0.5-5mm.
In one embodiment, described reflecting material comprises aluminium film or silverskin.
The critical piece of neutron two-dimensional position detector of the present utility model, manufacturing process is ripe on the market, obtains channel extensive.Detector one-piece construction is simple, is easy to realize, and overall cost is well below traditional position resolution type neutron detector.
Neutron two-dimensional position detector of the present utility model, utilize the reconstruction of ripple shifting fiber array realization to incident neutron position on neutron sensitive scintillation body, flexible and changeable on ripple shifting fiber array structure, corresponding construction can be changed according to concrete physical requirement, as optical fiber pitch and optical fiber combination mode etc., to improve position resolution.
Neutron two-dimensional position detector of the present utility model is when realizing large area neutron position sensing, turn in the one end that fiber array can be connected with electrooptical device, to reduce the detection dead band of detector, the mode simultaneously utilizing multiple small size neutron two-dimensional position detector to splice, can realize large area neutron position sensing.
To sum up, it is high and can the advantage such as large-area manufacturing that fiber array reading type neutron position sensor of the present utility model has positioning precision, simultaneously and other neutron detectors current compare, cheap.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the neutron two-dimensional position detector vertical view of the utility model embodiment;
Fig. 2 is the neutron two-dimensional position detector side view of the utility model embodiment;
Fig. 3 is the ripple shifting fiber structural representation of the neutron two-dimensional position detector of the utility model embodiment;
Fig. 4 is the reflection schematic diagram of incident neutron in neutron-sensitive scintillator of the utility model embodiment;
Fig. 5 is the light signal distribution schematic diagram on the ripple shifting fiber array XY direction that obtains on H8500 of the utility model embodiment;
Fig. 6 A and Fig. 6 B is the Gauss curve fitting schematic diagram of the light signal distribution on the ripple shifting fiber array XY direction that obtains on H8500 of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, Figure 2 and Figure 3, the utility model provides a kind of neutron two-dimensional position detector, and this neutron two-dimensional position detector comprises: ripple shifting fiber array 1, neutron-sensitive scintillator 2 and electrooptical device 3.
Scintillator is the photoconduction type luminescent material that a kind of ionization energy by high-energy photon (x-ray, gamma-rays) or particle (hadron, electronics, proton, α particle etc.) changes into ultraviolet/visible light.Realize the effective detection to thermal neutron, scintillator material Medium Culture must be introduced nucleic such as larger 6Li, 10B, 157Gd, the 155Gd of thermal neutron absorption cross section.Neutron-sensitive scintillator, be exactly mainly the nuclear reaction based on neutron-sensitive material, its charged particle produced provides detectable output pulse in scintillator.Up to now, the neutron-sensitive scintillation material that each laboratory and company were studied in the world has a lot, such as: liquid scintillator BC-501A, plastic scintillant ST401, powder body material LiF/ZnS:Ag, crystalline material LiI (Eu), LiBaF3, Cs2LiYCl6:Ce, Li2B 4O7, LiYSiO4:Ce and Li6Gd (BO3) 3:Ce etc.
Current widely used neutron-sensitive scintillator on the market, mainly mixes
6the ZnS scintillator of Li, adulterates in ZnS (Ag) inorganic scintillator
6liF's
6liF/ZnS (Ag), lithium glass, mixes
6li or
10the plastic scintillant etc. of B.The utility model is with neutron-sensitive scintillator
6liF/ZnS (Ag) is described, for neutron-sensitive scintillator for example
6liF/ZnS (Ag), in incident neutron and scintillator
6li nuclear reaction, produces secondary charged particle, and charged particle is flashing in ZnS (Ag), the blue photons of final outgoing some.
Due to
6liF/ZnS (Ag) isotonic sensitive scintillation body is Powdered, needs by being coated in certain thickness aluminium base after adhesive curing to increase its physical strength.In one embodiment, neutron-sensitive scintillator
6the thickness of LiF/ZnS (Ag) is set to 400 μm, area 100 × 100mm
2, aluminium base area and neutron-sensitive scintillator
6liF/ZnS (Ag) is identical, and thickness is 1mm, is not intended to limit.In the utility model, neutron-sensitive scintillator
6the thickness of LiF/ZnS (Ag) and aluminium base can be arranged as the case may be.
Ripple shifting fiber array 1 is arranged on the below of neutron-sensitive scintillator 2, and connects electrooptical device 3, realizes the collection to the passage of scintillation light that neutron sensitive scintillation body 2 produces, and the passage of scintillation light of collection is transferred to electrooptical device 3.As shown in Figure 1, Figure 2 and Figure 3, neutron-sensitive scintillator 2 is in the below of aluminium base, and (ripple shifting fiber array 1 is positioned at the one side of neutron-sensitive scintillator 2 without aluminium base) is placed on the surface that ripple shifting fiber array 1 presses close to neutron-sensitive scintillator 2.
One end of electrooptical device 3 connects ripple shifting fiber array 1, other end connection signal output port.Electrooptical device 3 receives the passage of scintillation light that neutron-sensitive scintillator 2 produces, and passage of scintillation light is carried out opto-electronic conversion, generates electric signal, is then exported by electric signal by signal output port.Signal output port is connected to electronic system and the data-acquisition system of rear end, the electric signal analysis that electronic system and data-acquisition system obtain electrooptical device 3, by the analysis to this electric signal, can judge the ripple shifting fiber being in what position transmits how many photons, thus release corresponding neutron incoming position on neutron-sensitive scintillator 2.The fiber array of single direction arrangement obtains the positional information of neutron in this direction dimension, and two double-deck optical fiber arrangements of vertical direction just can obtain the two-dimensional signal of incident neutron.
It should be noted that: the effect of neutron two-dimensional position detector of the present utility model is for electronic system and data-acquisition system provide electric signal, the data source that the two-dimensional signal as incident neutron is analyzed.In addition, electronic system and data-acquisition system are analyzed electric signal, have been the known technology of this area, not protection category of the present utility model.
As shown in Figure 1, Figure 2 and Figure 3, ripple shifting fiber array 1 is made up of the mutually perpendicular ripple shifting fiber of two-layer arragement direction, and the passage of scintillation light of collecting neutron-sensitive scintillator 2 is respectively in the distribution of X and Y-direction.Every layer of ripple shifting fiber can irregular alignment, the spacing between two-layer ripple shifting fiber can be set to 0.5-5mm, and the utility model is not as limit.
In one embodiment, one end of every layer of ripple shifting fiber connects electrooptical device, and the other end 4 is coated with reflecting material, and this reflecting material can be aluminium film or silverskin.Ripple shifting fiber can pass through light-guide material or Air Coupling electrooptical device 3.
As shown in Figure 4, ripple shifting fiber has sandwich layer 5 and covering 6, comprise ripple in sandwich layer 5 and move material, ripple moves material by the photonic absorption of a certain wavelength incident and changes into the longer photon of wavelength, photon after conversion utilizes covering 6 and Air Interface total emission in ripple shifting fiber, by photon transmission to optical fiber two ends.Covering 6 can have single or multiple lift, and the effect of covering 6 is the light transmissioning efficiencies that can increase ripple shifting fiber.
During concrete enforcement, as shown in Figure 4, when incident neutron with
6liF/ZnS (Ag) reaction produces after blue light, and the ripple shifting fiber close to incident neutron position is absorbed into the blue light that is mapped to fiber core layer and changes into green glow, utilizes total reflection principle by the two ends of green light transmission to ripple shifting fiber.Optical fiber two ends need through polishing, and then one end plates the silverskin (reflectivity >80%) of high reflectance, and one end is coupled with the windowpane of electrooptical device 3.Be transferred to the green glow at ripple shifting fiber two ends, one end directly enters electrooptical device 3 windowpane, and the other end reflects through silverskin, finally also will be transferred to the windowpane of electrooptical device 3.
Conventional electrooptical device has photomultiplier PMT (Photo Multiplier Tube), semiconductor photodetector, Charged Couple original paper CCD (Charge-coupled Device) etc.Due to semiconductor photodetector and CCD expensive, can consider when small size makes to use, in large area situation, the main photomultiplier that adopts is as electrooptical device.
Neutron two-dimensional position detector of the present utility model, when realizing large area neutron position sensing, in order to reduce the detection dead band of detector, one end turning formation one kink 7 that fiber array can be connected with electrooptical device.In order to realize the detection of large area neutron position, the mode that can simultaneously utilize multiple small size neutron two-dimensional position detector to splice, realizes large area neutron position sensing.
In order to better the utility model is described, be described below in conjunction with specific embodiment, in the present embodiment, neutron-sensitive scintillator adopts
6liF/ZnS (Ag), electrooptical device 3 adopts multi-anode photomultiplier MA-PMT.
As mentioned above, neutron-sensitive scintillator
6liF/ZnS (Ag) mainly adulterates in ZnS (Ag) inorganic scintillator
6liF, incident neutron and neutron-sensitive scintillator
6in LiF/ZnS (Ag)
6li nuclear reaction, produces secondary charged particle, and charged particle is flashing in ZnS (Ag), the blue photons of final outgoing some.Due to
6liF/ZnS (Ag) for Powdered, by being coated in certain thickness aluminium base after adhesive curing to increase its physical strength.In one embodiment, neutron-sensitive scintillator
6liF/ZnS (Ag) thickness 400 μm, area 100 × 100mm
2, aluminium base area is identical, and thickness is 1mm.
Ripple shifting fiber array is positioned at the one side of scintillator without aluminium base, when incident neutron with
6after LiF/ZnS (Ag) reaction produces blue light, the ripple shifting fiber close to incident neutron position is absorbed into the blue light being mapped to ripple shifting fiber sandwich layer, changes into green glow, utilizes total reflection principle by green light transmission to ripple shifting fiber two ends.Ripple shifting fiber two ends are after polishing, and one end plates the silverskin (reflectivity >80%) of high reflectance, and one end is coupled with the windowpane of multi-anode photomultiplier MA-PMT.Be transferred to the green glow at ripple shifting fiber two ends, one end directly enters the windowpane of photomultiplier, and the other end reflects through silverskin, is finally also transferred to the windowpane of photomultiplier.
The two-layer ripple shifting fiber of ripple shifting fiber array is close to, with neutron-sensitive scintillator
6the spacing of LiF/ZnS (Ag) is 1mm, and every layer is made up of 50 optical fiber respectively, and optical fiber pitch is 2mm, also can irregular alignment.
Multi-anode photomultiplier MA-PMT is connected to one end of ripple shifting fiber, adopt H8500MA-PMT, its working cell is 8 × 8, two H8500 are needed to receive the light signal of double-deck ripple shifting fiber: a H8500 connects the optical fiber of X-direction arrangement, one end of every root optical fiber is all coupled on a working cell of H8500, and 50 optical fiber of every one deck meet H8500 and correspond to 50 working cells; Another H8500 connects the optical fiber of Y-direction arrangement, and concrete connection is consistent with X-direction optical fiber connection.
Multi-anode photomultiplier MA-PMT is connected to electronic system and the data-acquisition system of rear end, electronic system and data-acquisition system realize carrying out amplification to the photosignal of each working cell and are shaped, and carry out analog-to-digital conversion, the digital signal after conversion stores through obtaining system log (SYSLOG).According to the photosignal on all H8500 working cells, the light signal distribution on two-layer optical fiber can be obtained, by the Gauss curve fitting distributed to two-layer light signal, the center of XY direction optical signal distribution can be obtained, its correspondence be exactly the position of incident neutron on XY direction.The ripple shifting fiber array XY direction optical signal distribution that H8500 obtains is as shown in Fig. 5 and Fig. 6 A and Fig. 6 B.
Apply specific embodiment in the utility model to set forth principle of the present utility model and embodiment, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (7)
1. a neutron two-dimensional position detector, is characterized in that, described neutron two-dimensional position detector comprises:
Neutron-sensitive scintillator, is coated with on aluminum substrates;
Ripple shifting fiber array, is arranged on the below of described neutron-sensitive scintillator, for collecting the passage of scintillation light that described neutron-sensitive scintillator produces;
Electrooptical device, one end of described electrooptical device connects described ripple shifting fiber array, other end connection signal output port, the passage of scintillation light described in described electrooptical device receives, and exported by described signal output port after described passage of scintillation light being carried out opto-electronic conversion.
2. neutron two-dimensional position detector according to claim 1, is characterized in that, described ripple shifting fiber array is made up of the mutually perpendicular ripple shifting fiber of two-layer arragement direction, and the passage of scintillation light of collecting described neutron-sensitive scintillator is respectively in the distribution of X and Y-direction; One end of every layer of described ripple shifting fiber connects described electrooptical device, and the other end is coated with reflecting material.
3. neutron two-dimensional position detector according to claim 2, is characterized in that, described ripple shifting fiber has sandwich layer and covering, comprises ripple and move material in described sandwich layer.
4. neutron two-dimensional position detector according to claim 2, is characterized in that, described ripple shifting fiber is by light-guide material or the electrooptical device described in Air Coupling.
5. the neutron two-dimensional position detector according to claim 2 or 4, is characterized in that, one end that described ripple shifting fiber is connected with electrooptical device has a kink.
6. neutron two-dimensional position detector according to claim 2, is characterized in that, the spacing between two-layer described ripple shifting fiber is 0.5-5mm.
7. neutron two-dimensional position detector according to claim 2, it is characterized in that, described reflecting material comprises aluminium film or silverskin.
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| CN108398709A (en) * | 2017-02-08 | 2018-08-14 | 中国辐射防护研究院 | A kind of optical fiber radiation probe |
| CN111025376A (en) * | 2019-12-26 | 2020-04-17 | 中广核久源（成都）科技有限公司 | Detector for measuring fast neutron and fast response and high detection efficiency |
| CN114460622A (en) * | 2022-02-16 | 2022-05-10 | 中国工程物理研究院材料研究所 | Novel large-area thermal neutron detector |
| CN114942469A (en) * | 2022-05-23 | 2022-08-26 | 西北核技术研究所 | Neutron detection method and device based on flexible gallium nitride two-dimensional electron gas |
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- 2014-08-27 CN CN201420489372.0U patent/CN204166139U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108398709A (en) * | 2017-02-08 | 2018-08-14 | 中国辐射防护研究院 | A kind of optical fiber radiation probe |
| CN107478660A (en) * | 2017-09-14 | 2017-12-15 | 中国石油大学(北京) | A kind of optical fiber quality detecting system and method |
| CN107478660B (en) * | 2017-09-14 | 2023-11-03 | 中国石油大学(北京) | Optical fiber quality detection system and method |
| CN111025376A (en) * | 2019-12-26 | 2020-04-17 | 中广核久源（成都）科技有限公司 | Detector for measuring fast neutron and fast response and high detection efficiency |
| CN114460622A (en) * | 2022-02-16 | 2022-05-10 | 中国工程物理研究院材料研究所 | Novel large-area thermal neutron detector |
| CN114460622B (en) * | 2022-02-16 | 2023-10-31 | 中国工程物理研究院材料研究所 | Novel large-area thermal neutron detector |
| CN114942469A (en) * | 2022-05-23 | 2022-08-26 | 西北核技术研究所 | Neutron detection method and device based on flexible gallium nitride two-dimensional electron gas |
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