CN204302502U - Neutron positional detecting device - Google Patents
Neutron positional detecting device Download PDFInfo
- Publication number
- CN204302502U CN204302502U CN201420854523.8U CN201420854523U CN204302502U CN 204302502 U CN204302502 U CN 204302502U CN 201420854523 U CN201420854523 U CN 201420854523U CN 204302502 U CN204302502 U CN 204302502U
- Authority
- CN
- China
- Prior art keywords
- neutron
- optical fiber
- convert optical
- wavelength convert
- wavelength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model relates to a kind of neutron positional detecting device, this device comprises neutron scintillator screen, wavelength convert optical fiber, electrooptical device, data collecting system, location determination and image display system, wherein: neutron scintillator screen absorbs incident neutron, send the blue light that peak wavelength is 450nm, this blue light is absorbed by wavelength convert optical fiber, being converted into peak wavelength is 492nm, the green glow that the device that is easily photoelectrically converted receives, and by this green light transmission to electrooptical device, electrooptical device receives the optical signal sent from wavelength convert optical fiber, and this optical signal is converted to the signal of telecommunication, flow to data collecting system, after the signal of telecommunication carries out amplifying and process by data collecting system, be converted to digital data transmission to location determination and image display system, thus determine the incoming position of neutron, and generate and show the image of neutron position distribution.Sniffer of the present utility model, measure sensitive, size is little, lightweight, low price; And do not need to work under high voltages, reduce the difficulty of design.
Description
Technical field
The utility model belongs to position sensing technology, is specifically related to a kind of neutron positional detecting device.
Background technology
Being obtained the information of hydrogen atom by neutron spectrometer system, thus on atom and molecular scale, study structure and the microscopic motion rule of material, is widely used technological means in the multidisciplinary fields such as Condensed Matter Physics, chemistry, life science, material science.Neutron position sensitive detector is the key components of neutron spectrometer system.Generally adopt at present based on
3the neutron position sensitive sniffer scale of He gas detector is huger, R&D costs are higher, and along with
3the minimizing of He amount of gas, it applies the restriction being subject to raw material and cost aspect further.Therefore, need research and development new neutron position sensitive detection method and device badly, with substitute based on
3the detection mechanism of He gas detector.
In recent years, just mainly comprise based on painting at the new neutron position sensitive detector of active research in the world
10the GEM gas detector of B, based semiconductor neutron detector array, based on containing
10b or
6the types such as the scintillator of Li.Neutron position sensitive detector based on scintillator, compared with the neutron position sensitive detector based on gas detector, has higher detection efficient, can realize more compact structure design, reduce scale and the cost of detector; Compared with the neutron position sensitive detector of based semiconductor array, then there is lower gamma-rays sensitivity, and can still keep more stable performance after the match in strong neutron irradiation.
At present, the mode combined mainly through neutron scintillator screen and CCD camera or wavelength convert optical fiber (Wavelength Shifting Fiber, WLSF) based on the neutron position sensitive detection of scintillator realizes.Wherein, can realize larger detection area at a lower cost based on neutron scintillator screen and the detection mechanism of WLSF, the adjustment for position resolution is also more flexible.
To utilize with the neutron position sensitive detector of WLSF based on neutron scintillator screen and contain
10b or
6the neutron transition material of Li etc. and ZnS (Ag) scintillator are mixed and made into neutron scintillator and shield, and utilize WLSF to be converted to the blinking light that neutron and scintillation screen effect produce easily by the wave band that light-detecting device responds, and then received by light-detecting device and be converted into the signal of telecommunication that can measure and record.Generally adopt at present photomultiplier as light-detecting device, its cost is higher, and volume and weight is comparatively large, for the detection area that Design and implementation is larger, and reduces the factor that the scale of detector and cost are restrictions.
Utility model content
For the defect existed in prior art, the utility model provides a kind of neutron positional detecting device, and size is little, lightweight, structure simple, has higher detectivity; Without the need to working under high voltages, reduce the difficulty of design.
For reaching above object, the technical solution adopted in the utility model is: provide a kind of neutron positional detecting device, this device comprises neutron scintillator screen, wavelength convert optical fiber, electrooptical device, data collecting system, location determination and image display system, wherein:
Described neutron scintillator screen, for absorbing neutron ray, and sends the passage of scintillation light of certain wavelength;
Described wavelength convert optical fiber, for receiving the passage of scintillation light that scintillation screen sends, and converting this passage of scintillation light the wavelength of the response device that is easily photoelectrically converted to, being transferred to electrooptical device;
Described electrooptical device, for receiving the passage of scintillation light that wavelength convert optical fiber sends, and is converted into the signal of telecommunication that can measure and record and flows to data collecting system by this blinking light;
Described data collecting system, for receiving the signal of telecommunication of electrooptical device transmission, and being undertaken amplifying and processing by this signal of telecommunication, being then converted into digital data transmission to location determination and image display system;
Described location determination and image display system, for receiving the data signal of data collecting system transmission, and according to the position of this data signal determination neutron, generate and the distributed image of display neutron position.
Further, described electrooptical device adopts silicon photomultiplier.
Further, described neutron scintillator screen adopts
10b or
6li and ZnS (Ag) scintillator is mixed.
Further, the employing two pieces of described neutron scintillator screen, and two pieces of described neutron scintillator shield parallel placement.
Further, be provided with multiple wavelength convert optical fiber between two pieces of described neutron scintillator screens, multiple wavelength convert optical fiber is arranged in parallel along two orthogonal directions respectively.
Further, described in every root, the two ends of wavelength convert optical fiber are all connected with silicon photomultiplier array, and wherein, every root or every end of adjacent several light wavelength conversion fibre are connected with a sensing unit of silicon photomultiplier.
Advantageous Effects of the present utility model is: adopt silicon photomultiplier array to substitute conventional photomultiplier as electrooptical device, its size is less, weight is lighter, price is only 1/tens of position sensitive photo-multiplier tube, and do not need to work under high voltages, effectively reduce the volume of detector, weight, design complexities and cost; At aspect of performance, silicon photomultiplier can reach the photocurrent gain suitable with photomultiplier, and the wavelength (492nm) of the peak value of its spectral response curve and the luminescence of wavelength convert optical fiber is more close, corresponding detection efficient can reach 20%, and photomultiplier is about 15% at the photo-quantum efficiency at this wavelength place.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the utility model neutron positional detecting device;
Fig. 2 is the structural representation of the utility model neutron positional detecting device.
In figure:
1-neutron scintillator screen 2-wavelength convert optical fiber 3-electrooptical device unit
Detailed description of the invention
Below in conjunction with accompanying drawing, detailed description of the invention of the present utility model is described in further detail.
As shown in Figure 1, be the utility model neutron position sensitive sniffer, this sniffer comprise ZnS (Ag)/
10b neutron scintillator screen, wavelength convert optical fiber, electrooptical device, data collecting system (DAQ), location determination and image display system.Wherein, neutron incide ZnS (Ag)/
10on B neutron scintillator screen, with
10b occurs
10b (n, α)
7li reacts, and produces
7li and α particle.Above-mentioned secondary charged particle and the effect of ZnS (Ag) scintillator, send the blue-fluorescence that peak wavelength is 450nm.This blue-fluorescence is absorbed by wavelength convert optical fiber, being converted into peak wavelength is 492nm, the green glow that the device that is easily photoelectrically converted receives, and transfer to the corresponding units of electrooptical device array, electrooptical device receives the green glow sent by wavelength convert optical fiber, and outputting analog signal, this analog signal carries out amplifying and processing through data collecting system, thus be converted to digital data transmission to computer, neutron location determination and image display is carried out again by the neutron location determination of computer and image display system, determine the incoming position of neutron, and generate and show the image of neutron position distribution.
Wherein, electrooptical device adopts silicon photomultiplier (SiPM, SiliconPhotomultiplier) array as electrooptical device.Compare position sensitive photo-multiplier tube, the size of silicon photomultiplier array is little, lightweight, structure is simple, price is only the former 1/tens, and does not need to work under high voltages, reduces the difficulty of design.At aspect of performance, silicon photomultiplier array can reach the photocurrent gain suitable with photomultiplier, and the wavelength (492nm) of the peak value of its spectral response curve and the luminescence of wavelength convert optical fiber is more close, corresponding detection efficient can reach 20%, and photomultiplier is about 15% at the photo-quantum efficiency at this wavelength place.Therefore, use silicon photomultiplier array to substitute photomultiplier, while maintenance detection efficient, effectively reduce the volume of detector, weight, design complexities and cost.
As shown in Figure 2, this sniffer adopt the ZnS (Ag) of 2 pieces of parallel placements/
10b neutron scintillator screen 1, is provided with many wavelength convert optical fiber 2 between 2 pieces of neutron scintillator screen 1, and many wavelength convert optical fiber 2 is arranged in parallel respectively along two orthogonal directions and X, Y-direction.The two ends of every root wavelength convert optical fiber 2 are all connected with silicon photomultiplier array, the end of every root or every adjacent several light wavelength conversion fibre 2 accesses 1 electrooptical device unit 3, the connected mode of the utility model wavelength convert optical fiber, be not limited to above-mentioned connected mode, can determine according to the real needs measuring area, collection efficiency etc.
Sputtering ZnS (Ag)/
10b neutron scintillator screen adopts a certain proportion of ZnS (Ag) and H
3 10bO
3be mixed.Neutron scintillator screen sensitive area is of a size of 80mm × 80mm, and the thickness of forward and backward two pieces of neutron scintillator screen is respectively 400 μm and 200 μm.
X-direction (i.e. horizontal direction), Y-direction (being vertical direction) respectively adopt 32 wavelength convert optical fiber, and arrangement pitch is 1.5mm.The cross sectional shape of wavelength convert optical fiber is circular, and diameter is 1mm, and length is 1m.The end face of wavelength convert optical fiber is connected with electrooptical device array by custom-designed joint.
Adopt the electrooptical device unit of 24 × 4 arrays, the sensitive area of its each electrooptical device unit is 3mm × 3mm.
The 32 tunnel analog signals that electrooptical device exports by data collecting system carry out amplification and noise is screened, and are converted into data signal; Again by parallel data acquisition card, by each railway digital Signal transmissions to computer.
May be absorbed by many wavelength convert optical fiber on same direction because neutron scintillator shields the fluorescence sent, adopt method for mode matching to carry out the judgement of neutron position.As shown in the table, for X-direction, if (locus of corresponding wavelength convert optical fiber is designated as x to adjacent 4 road wavelength convert fiber-optic signals respectively
n, x
n+1, x
n+2, x
n+3, every road comprises 2 adjacent wavelength convert optical fiber) output situation with table in arbitrary pattern consistent time, judge that neutron incoming position is as x
n+1place.If the match condition of many group different modes appears in each road wavelength convert fiber-optic signal of X-direction, then the principle reduced in turn according to A, B, C, D quasi-mode priority is selected.
According to the positional information of a large amount of neutrons detected, obtain the position distribution of neutron, and show with image format.
The utility model has built neutron position resolution experiments of measuring system, utilizes the performance of reactor thermal source to neutron positional detecting device to test.
Sniffer is placed on exit, neutron duct, measures the counting rate of sniffer.Utilize ambient neutron dose equivalent meter to measure the Neutron Dose Equivalent Rate of this position, be combined with the counting rate of sniffer, obtain the detection efficient of sniffer.During test, sniffer is positioned over the side of neutron duct outlet, sniffer distance duct export center 2m, becomes 30 ° of angles with duct axis direction, to reduce neutron fluence rate, prevents the too high electronic system that causes of counting rate can not effective resoluting signal.According to measurement result, the detection efficient of this device can reach 18.2%.
At 4 layer thicknesses be 1mm cadmium metal sheet on open single hole or porous, and place it in detector front, with the neutron position resolution of test probes device.Because cadmium metal sheet has neutron absorption capability, the position of being blocked by cadmium metal sheet and position of opening can form neutron fluence rate difference, be reflected on the neutron position distribution image of sniffer acquisition, the image-region corresponding with position of opening can present higher brightness.
When the slot of 1 4mm × 8mm is opened in cadmium metal sheet centre position, the centre position of sniffer acquisition image demonstrates the high-brightness region (position resolution of detector is 5mm) of a 5mm × 10mm.
Cadmium metal sheet is opened multiple 2mm circular hole, and when forming 1 " work " word figure, the relevant position that sniffer obtains image is also shown as high brightness point, forms " work " word figure.
Above-mentioned test result shows, the neutron positional detecting device utilizing electrooptical device SiPM to substitute photomultiplier can effectively realize measuring the position sensitive of neutron.
Neutron positional detecting device of the present utility model is not limited to above-mentioned detailed description of the invention, and those skilled in the art draw other embodiment according to the technical solution of the utility model, belongs to technological innovation scope of the present utility model equally.
Claims (5)
1. a neutron positional detecting device, is characterized in that: this device comprises neutron scintillator screen, wavelength convert optical fiber, electrooptical device, data collecting system, location determination and image display system, wherein:
Described neutron scintillator screen, for absorbing neutron ray, and sends the passage of scintillation light of certain wavelength;
Described wavelength convert optical fiber, for receiving the passage of scintillation light that scintillation screen sends, and converting this passage of scintillation light the wavelength of the response device that is easily photoelectrically converted to, being transferred to electrooptical device;
Described electrooptical device, for receiving the passage of scintillation light that wavelength convert optical fiber sends, and is converted into the signal of telecommunication that can measure and record and flows to data collecting system by this blinking light;
Described data collecting system, for receiving the signal of telecommunication of electrooptical device transmission, and being undertaken amplifying and processing by this signal of telecommunication, being then converted into digital data transmission to location determination and image display system;
Described location determination and image display system, for receiving the data signal of data collecting system transmission, and according to the position of this data signal determination neutron, generate and the distributed image of display neutron position.
2. neutron positional detecting device as claimed in claim 1, is characterized in that: described electrooptical device adopts silicon photomultiplier.
3. neutron positional detecting device as claimed in claim 1, is characterized in that: the employing two pieces of described neutron scintillator screen, and two pieces of described neutron scintillator shield parallel placement.
4. neutron positional detecting device as claimed in claim 3, is characterized in that: be provided with multiple wavelength convert optical fiber between two pieces of described neutron scintillator screens, multiple wavelength convert optical fiber is arranged in parallel along two orthogonal directions respectively.
5. neutron positional detecting device as claimed in claim 4, it is characterized in that: described in every root, the two ends of wavelength convert optical fiber are all connected with silicon photomultiplier array, wherein, every root or every end of adjacent several light wavelength conversion fibre are connected with a sensing unit of silicon photomultiplier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420854523.8U CN204302502U (en) | 2014-12-30 | 2014-12-30 | Neutron positional detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420854523.8U CN204302502U (en) | 2014-12-30 | 2014-12-30 | Neutron positional detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204302502U true CN204302502U (en) | 2015-04-29 |
Family
ID=53108033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420854523.8U Active CN204302502U (en) | 2014-12-30 | 2014-12-30 | Neutron positional detecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204302502U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104597479A (en) * | 2014-12-30 | 2015-05-06 | 中国原子能科学研究院 | Neutron position detection device |
-
2014
- 2014-12-30 CN CN201420854523.8U patent/CN204302502U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104597479A (en) * | 2014-12-30 | 2015-05-06 | 中国原子能科学研究院 | Neutron position detection device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7288771B2 (en) | Fiber optic thermal/fast neutron and gamma ray scintillation detector | |
| CN104597479A (en) | Neutron position detection device | |
| CN105022084B (en) | A kind of digitlization neutron spectrometer | |
| US8637826B2 (en) | Radiation detection system including a scintillating material and an optical fiber and method of using the same | |
| CN103185894B (en) | A kind of fast neutron detector | |
| CN106405625B (en) | Tubular neutron detector and its location detection methods | |
| CN106547017A (en) | A kind of compound scintillator gamma ray spectrometer | |
| CN106997058B (en) | A kind of scintillator performance testing device and its Concordance method | |
| CN103376461A (en) | Neutron position detector, detection system and detection method | |
| Stoykov et al. | A SiPM-based ZnS: 6LiF scintillation neutron detector | |
| CN102539451A (en) | Novel positron annihilation life time spectrometer | |
| Siegmund et al. | High spatial resolution neutron sensing microchannel plate detectors | |
| US10495766B2 (en) | Optoelectronic neutron detector | |
| CN103245680A (en) | Fast neutron imaging method and system based on time-of-flight method | |
| CN113219518A (en) | Radiation detection device and detection method based on perovskite scintillator | |
| CN204302502U (en) | Neutron positional detecting device | |
| CN101629917B (en) | Method and device for measuring effective atomic number of substance | |
| CN204945390U (en) | Neutron detector | |
| CN106291657A (en) | A kind of based on the radiant spectral analysis system closing bundle flash fiber | |
| CN108398710A (en) | A kind of device measured in real time for neutron energy spectrum in reactor | |
| CN201021941Y (en) | Single ion bundle remote counting detector | |
| Spector et al. | Scintillator fiber optic long counter for neutron detection | |
| CN201266183Y (en) | Device for measuring substance effective atomic number | |
| Peters et al. | Prospects of silicon photomultipliers for ground-based cosmic ray experiments | |
| CN202329646U (en) | Dim target ultraviolet star magnitude calibration system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |