CN106094003A - A kind of photonic crystal with composite structure scintillator - Google Patents
A kind of photonic crystal with composite structure scintillator Download PDFInfo
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- CN106094003A CN106094003A CN201610338660.XA CN201610338660A CN106094003A CN 106094003 A CN106094003 A CN 106094003A CN 201610338660 A CN201610338660 A CN 201610338660A CN 106094003 A CN106094003 A CN 106094003A
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- scintillator
- photonic crystal
- composite structure
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- crystal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/16—Measuring radiation intensity
- G01T1/20—Measuring radiation intensity with scintillation detectors
- G01T1/2008—Measuring radiation intensity with scintillation detectors using a combination of different types of scintillation detectors, e.g. phoswich
Abstract
The present invention relates to a kind of photonic crystal with composite structure scintillator, by bottom scintillator (101), it is arranged in the layer of photonic crystals (102) on bottom scintillator (101) and the top scintillator (103) being arranged on layer of photonic crystals (102) is constituted, bottom scintillator (101) is BGO scintillation crystal or CsI:Tl scintillation crystal, and top scintillator (103) is plastic scintillant.Compared with prior art, the present invention is luminous by the scintillator of photonic crystal two kinds of different wave lengths of regulation and control, realize the luminous separation on space angle of two kinds of scintillators, such that it is able to use two set photodetectors to gather the passage of scintillation light from gamma ray and neutron respectively, thus promote the examination measurement capability of detection system.
Description
Technical field
The invention belongs to nuclear radiation detection field, especially relate to a kind of photonic crystal with composite structure scintillator, by light
The different regulation and control to the light emission direction of the scintillator of two kinds of different emission of the sub-crystal, it is achieved two kinds of scintillators luminous along
Different directions is launched, and plays a role in the application of radioprotective particle discrimination.
Background technology
Scintillation detecter system is at nuclear medicine, nuclear physics experiment, high-energy physics experiment, weapon physical study, sky historical relic
The fields such as reason and cosmic ray detection have important application, are detection high-energy ray and the important method of particle.In this system
Core Feature material be scintillator, the effect of scintillator is to absorb the energy of radioprotective and convert thereof into visible ray or closely purple
Outer light.The performance of scintillator affects the detectivity of detection system strongly.
In actual emanations measures application, it is frequently encountered by the complicated field that particle to be measured is made up of multiple radiating particle, detection
The method of variety classes radiating particle belongs to particle discrimination and measures, and often can cause flicker due to different types of radiating particle
Luminescence, therefore particle discrimination measurement is the difficulties in radiation detection.Such as in the case of a lot, the spoke that radionuclide produces
Penetrating and i.e. comprise gamma ray and also contains neutron, effectively realize gamma/neutron screens that to measure be research nuclear process
Essential condition.Conventional gamma/neutron screen measure can utilize two kinds of scintillators different particle excitated lower die-away times not
With realizing, but two kinds of luminous superpositions spatially of scintillator result in the difficulty in detector layout, the signal collected
Face the serious problems interfered, therefore, it is difficult to improve efficiency and precision that particle discrimination is measured.
Chinese patent CN 105068106A discloses a kind of scintillator photons crystal structure and preparation method thereof, is used for solving
The technical problem that certainly existing scintillator light output efficiency is low.Technical scheme is that scintillator photons crystal structure includes scintillator and light
Sub-crystal two parts, photonic crystal is made up of a series of one-tenth hexangle types or four limit type periodic arrangement photon crystal microstructures.Light
Sub-crystal manufacture method includes force plate making, negative template making, polymer-coated and the step such as solidification, demoulding process.But
Photonic crystal scintillator disclosed in this patent only has a kind of scintillation component, excites at gamma ray and neutron and lower all can produce
Hair growth promoting light, produced luminescence has identical wavelength, spatially undistinguishable, therefore can not realize gamma/neutron and screen
Measure.
Summary of the invention
Defect that the purpose of the present invention is contemplated to overcome above-mentioned prior art to exist and provide a kind of and improve gamma/neutron
Screen the efficiency and the photonic crystal with composite structure scintillator of precision measured, by the sudden strain of a muscle of photonic crystal two kinds of different wave lengths of regulation and control
Bright body is luminous, it is achieved two kinds of luminous separation on space angle of scintillator, such that it is able to use two set photodetectors respectively
Gather from gamma ray and the passage of scintillation light of neutron, thus promote the examination measurement capability of detection system.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of photonic crystal with composite structure scintillator, by bottom scintillator, is arranged in the photonic crystal on the scintillator of bottom
Layer and the top scintillator being arranged on layer of photonic crystals are constituted,
Described bottom scintillator is BGO scintillation crystal (emission wavelength peak 560nm) or (transmitting of CsI:Tl scintillation crystal
Wavelength peak 500nm), thickness is 0.5-5mm.This layer of scintillator is responsible for absorption and the detection of gamma ray, due to gamma ray
There is stronger penetration capacity, it is necessary to take the thickness of millimeter magnitude, and use the mineral crystal of higher density as scintillator.
Described top scintillator is plastic scintillant, uses the method for spin coating to prepare.
The thickness of described bottom scintillator is 0.5-5mm.
Described top scintillator is made up of the plastic matrix of adulterate luminous agent and Wavelength shifter, described luminous agent, moves ripple
Agent, the weight ratio of plastic matrix are a:a:100-2a, and wherein the scope of a is 1-3.
Preferably, luminous agent is p-terphenyl (C18H14) or PBD (C20H14N2O), Wavelength shifter is POPOP (C20H14N2O2)
Or BBO (C24H18NO), plastic matrix is polymethylstyrene, polymethyl methacrylate or polystyrene.
Top scintillator emission wavelength peak value is 380-420nm, and this layer of scintillator is responsible for absorption and the detection of neutron, due to
Comprising a large amount of protium in plastic scintillant, the cross section producing uclear recoil with neutron is big, it is easy to stops neutron and absorbs its energy,
Realize effective detection of neutron.Thickness is 0.5-3 μm.This thickness can effectively absorb neutron, but for the absorption of gamma ray
Almost can ignore.
Bottom layer of photonic crystals control, scintillator and top scintillator are launched along different directions, specifically, and photonic crystal
Bottom layer control, the direction of scintillator is along normal to a surface direction, and controlling top scintillator edge is 40-60 ° of angle with normal
Direction.
The process of photonic crystal regulation and control scintillator luminescence is wavelength dependence, therefore have selected two kinds of emission wavelengths and has aobvious
Write the scintillator of difference, it is possible to so that the different light launching wavelength is launched in different directions, it is achieved spatially
Separate, the beneficially reception of detector.
Layer of photonic crystals is triangle poroid periodic array structure, and its poroid position is filled by top scintillator.Three-legged structure
Having higher symmetry, after having prepared top scintillator, its poroid position is filled by plastic scintillant, the height of photonic crystal
For 200-300nm, its value is near half passage of scintillation light wavelength, has significant regulating effect.
Compared with prior art, the present invention screens measurement to realize effective gamma/neutron, uses in structure designs
Two kinds of scintillators, they will respond gamma ray and neutron respectively, and produce corresponding luminous.What both scintillators produced sends out
Optical wavelength is different, under the effect of photonic crystal, will launch, it is achieved two kinds of luminous separation on different space angles,
Receiving luminous signal respectively in corresponding angle, the examination that can realize gamma ray and neutron is measured, and has the advantage that
(1) there are two kinds of different scintillators to absorb and detect gamma ray and neutron respectively, improve gamma/neutron and screen survey
The efficiency of amount and precision；
(2) scintillator by photonic crystal two kinds of different wave lengths of regulation and control is luminous, and the light of two kinds of scintillators is along different
Direction is launched, and can arrange corresponding detector in a different direction, it is achieved the examination of gamma ray and neutron is measured.
Accompanying drawing explanation
Fig. 1 is the profile of the structural representation of the present invention；
Fig. 2 is the sample dispersion relation of the FDTD simulation of embodiment 1；
Fig. 3 be embodiment 1 excitation of X-rays under the transmitting of sample and angular dependence.
In figure, scintillator bottom 101-, 102-layer of photonic crystals, 103-top scintillator.
Detailed description of the invention
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
A kind of photonic crystal with composite structure scintillator, its structure is as it is shown in figure 1, by bottom scintillator 101, be arranged in bottom
Layer of photonic crystals 102 and the top scintillator 103 being arranged on layer of photonic crystals 102 on scintillator are constituted.
In the present embodiment, the BGO scintillator that bottom scintillator uses thickness to be 0.5mm, emission wavelength peak 560nm, its
Refractive index is 2.15.Top scintillator is doping luminous agent p-terphenyl (C18H14) and the polymethyl-benzene second of Wavelength shifter POPOP
Alkene, its weight ratio is 1:1:98, and thickness is 0.5 micron, and its emission wavelength peak value is 410nm, and its refractive index is 1.58.Photon
Crystalline component is the photoresist PMMA of solidification, and refractive index 1.49, structure is triangular symmetrical periodic structure, and the cycle is 360nm, poroid
A diameter of 200nm, highly 200nm.Prepared by employing nanometer embossing, conformal deposited a layer thickness again after photoresist structure solidification
TiO for 40nm2, its refractive index is 2.9 in order to increase refractive index contrast, additionally TiO2Layer the finest and close, can in case
When only preparing plastic scintillant, organic solvent and photoresist structure generation chemical reaction destroy the structure of photonic crystal.The knot of this example
Structure parameter is the value obtained after FDTD simulates, and its dispersion relation is as shown in Figure 2.It will be seen that BGO emission spectrum pair
Answer 0 ° in the transmitting of normal direction, i.e. dispersion relation, and the emission spectrum of plastic scintillant is corresponding becomes with normal direction
The transmitting of 50 °.
Concrete preparation process is as follows: employing area is 20mmX20mm, and thickness is the monocrystalline BGO scintillator of 0.5mm, two-sided
Polishing.Nanometer embossing is used to prepare photoresist structure on its surface.Require first with commercially available satisfied design
Soft template prepared by dura mater plate, waters a strata dimethyl siloxane on photonic crystal hard template surface, waits polydimethylsiloxane
Naturally, after launching and progressively solidifying, polydimethylsiloxane layer is separated with hard template, obtains that there is silicon photonic crystal corresponding
Transconfiguration soft template.The compacting of photon crystal structure, at scintillator surface spin coating one layer photoetching glue, has photon by soft template
The one side of crystal structure is covered on photoresist and applies pressure, uses ultraviolet to be solidified by photoresist.The demoulding, takes soft template
Under, the photoresist sticking to scintillator surface the most intactly maintains the photon crystal structure of design.Use atomic layer deposition subsequently
Long-pending system prepares the TiO that 40nm is thick2Layer, this layer of conformal deposited is in the photoresist structure surface of the solidification prepared.Plastic scintillation
Prepared by the spin coating of body.It is doping luminous agent p-terphenyl (C in polymethylstyrene by commercially available composition18H14) and move ripple
The plastic scintillant of agent POPOP is dissolved in toluene, and adds suitable adhesive, is configured to colloidal material, by this material
Drip in the body structure surface prepared, utilize spin coater according to the speed spin coating 2 minutes of 2000r/min, certain thickness can be obtained
Plastic scintillation film, in order to allow organic solvent volatilize as soon as possible, by the sample for preparing under infrared lamp at a temperature of about 90 DEG C
Toast 5 minutes, the plastic scintillant layer that thickness is 0.5 micron can be obtained.Owing to the preparation of plastic scintillant uses colloid rotation
The method being coated with, its colloid has certain mobility, therefore can be filled among the hole of photon crystal structure.Final acquisition
The structural sample of design.
Fig. 3 is shown that under excitation of X-rays, electromagnetic radiation spectrum and the relation of angle.Result shows sending out of BGO scintillator
Light is concentrated mainly near normal direction, and plastic scintillant luminescence has significant directivity, test result to reach near 50 °
Design requirement.
Embodiment 2
Disclosed photonic crystal with composite structure scintillator in the present embodiment, its structure is same as in Example 1, and bottom flashes
The CsI:Tl scintillator that body uses thickness to be 5mm, emission wavelength peak 500nm, its refractive index is 1.82.Top scintillator is adopted
With doping luminous agent p-terphenyl PBD and the polymethylstyrene of Wavelength shifter BBO, its weight ratio is 3:3:94, and thickness is 3 micro-
Rice, its emission wavelength peak value is 420nm, and its refractive index is 1.58.Photonic crystal composition SiN, refractive index 1.49, structure is triangle
Symmetric periodic structure, the cycle is 400nm, poroid a diameter of 180nm, highly 200nm.Conditional electronic bundle lithographic method is used to prepare
Photon crystal structure.In CsI:Tl emission spectrum the is corresponding transmitting of normal direction, i.e. dispersion relation 0 °, and plastic scintillant
The corresponding transmitting becoming 60 ° with normal direction of emission spectrum.
Concrete preparation process is as follows: employing area is 5mmX5mm, and thickness is the monocrystalline CsI:Tl scintillator of 5mm, two-sided throwing
Light.Nanometer embossing is used to prepare photoresist structure on its surface.It is brilliant that the method using electron beam lithography prepares corresponding photon
Body structure.It is adulterate in polymethylstyrene luminous agent p-terphenyl PBD and the plastics of Wavelength shifter BBO by commercially available composition
Scintillator is dissolved in toluene, and adds suitable adhesive, is configured to colloidal material, drips this material in the knot prepared
Structure surface, utilizes spin coater according to the speed spin coating 2 minutes of 4000r/min, can obtain certain thickness Plastic scintillation film, for
Allow organic solvent volatilize as soon as possible, the sample prepared is toasted 5 minutes at a temperature of about 90 DEG C under infrared lamp, can obtain
Obtain the plastic scintillant layer that thickness is 3 microns.
Claims (9)
1. a photonic crystal with composite structure scintillator, it is characterised in that by bottom scintillator (101), is arranged in bottom flicker
Layer of photonic crystals (102) and the top scintillator (103) being arranged on layer of photonic crystals (102) on body (101) are constituted,
Described bottom scintillator (101) is BGO scintillation crystal or CsI:Tl scintillation crystal,
Described top scintillator (103) is plastic scintillant.
A kind of photonic crystal with composite structure scintillator the most according to claim 1, it is characterised in that described bottom flicker
The thickness of body (101) is 0.5-5mm.
A kind of photonic crystal with composite structure scintillator the most according to claim 1, it is characterised in that described top flicker
Body (103) is made up of doping luminous agent and the plastic matrix of Wavelength shifter, described luminous agent, Wavelength shifter, the weight of plastic matrix
Ratio is a:a:100-2a, and wherein the scope of a is 1-3.
A kind of photonic crystal with composite structure scintillator the most according to claim 3, it is characterised in that
Described luminous agent is p-terphenyl (C18H14) or PBD (C20H14N2O),
Described Wavelength shifter is POPOP (C20H14N2O2) or BBO (C24H18NO),
Described plastic matrix is polymethylstyrene, polymethyl methacrylate or polystyrene.
A kind of photonic crystal with composite structure scintillator the most according to claim 1, it is characterised in that described photonic crystal
Bottom layer (102) control, scintillator (101) and top scintillator (103) are launched along different directions.
A kind of photonic crystal with composite structure scintillator the most according to claim 5, it is characterised in that described photonic crystal
Bottom layer (102) control, the direction of scintillator (101) is along normal to a surface direction.
A kind of photonic crystal with composite structure scintillator the most according to claim 5, it is characterised in that described photonic crystal
Layer (102) controls top scintillator (103) along the direction with normal being 40-60 ° of angle.
8. according to a kind of photonic crystal with composite structure scintillator according to any one of claim 5-7, it is characterised in that described
Layer of photonic crystals (102) be triangle poroid periodic array structure, its poroid position by top scintillator (103) fill.
A kind of photonic crystal with composite structure scintillator the most according to claim 8, it is characterised in that described photonic crystal
The height of layer (102) is half passage of scintillation light wavelength.
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Cited By (8)
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| CN106842370A (en) * | 2016-12-21 | 2017-06-13 | 兰州空间技术物理研究所 | A kind of method for improving inorganic scintillation crystal light output |
| CN107356954A (en) * | 2017-06-26 | 2017-11-17 | 同济大学 | A kind of photonic crystal scintillation component to be lighted with directionality |
| CN107966727A (en) * | 2017-11-27 | 2018-04-27 | 中核控制系统工程有限公司 | A kind of neutron composite detecting device |
| CN108152851A (en) * | 2017-11-27 | 2018-06-12 | 中核控制系统工程有限公司 | A kind of fast, slow neutron complex detector |
| CN108761517A (en) * | 2018-04-19 | 2018-11-06 | 同济大学 | A kind of internally-arranged type photonic crystal scintillator |
| CN109407139A (en) * | 2018-12-21 | 2019-03-01 | 苏州瑞派宁科技有限公司 | Combine scintillation crystal and radiation detector assembly and system including combining scintillation crystal |
| WO2019085157A1 (en) * | 2017-11-01 | 2019-05-09 | 同济大学 | Micro-structure scintillator device having high light extraction efficiency |
| EP3502750A1 (en) | 2017-12-22 | 2019-06-26 | Commissariat à l'énergie atomique et aux énergies alternatives | Structured plastic scintillator |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106842370A (en) * | 2016-12-21 | 2017-06-13 | 兰州空间技术物理研究所 | A kind of method for improving inorganic scintillation crystal light output |
| CN107356954A (en) * | 2017-06-26 | 2017-11-17 | 同济大学 | A kind of photonic crystal scintillation component to be lighted with directionality |
| WO2019085157A1 (en) * | 2017-11-01 | 2019-05-09 | 同济大学 | Micro-structure scintillator device having high light extraction efficiency |
| CN107966727A (en) * | 2017-11-27 | 2018-04-27 | 中核控制系统工程有限公司 | A kind of neutron composite detecting device |
| CN108152851A (en) * | 2017-11-27 | 2018-06-12 | 中核控制系统工程有限公司 | A kind of fast, slow neutron complex detector |
| EP3502750A1 (en) | 2017-12-22 | 2019-06-26 | Commissariat à l'énergie atomique et aux énergies alternatives | Structured plastic scintillator |
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| CN108761517A (en) * | 2018-04-19 | 2018-11-06 | 同济大学 | A kind of internally-arranged type photonic crystal scintillator |
| CN109407139A (en) * | 2018-12-21 | 2019-03-01 | 苏州瑞派宁科技有限公司 | Combine scintillation crystal and radiation detector assembly and system including combining scintillation crystal |
| CN109407139B (en) * | 2018-12-21 | 2024-03-22 | 苏州瑞派宁科技有限公司 | Combined scintillation crystal and radiation detection device and system comprising same |
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