CN206322481U - A kind of fluorescent screen for X-ray detection - Google Patents
A kind of fluorescent screen for X-ray detection Download PDFInfo
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- CN206322481U CN206322481U CN201621146513.4U CN201621146513U CN206322481U CN 206322481 U CN206322481 U CN 206322481U CN 201621146513 U CN201621146513 U CN 201621146513U CN 206322481 U CN206322481 U CN 206322481U
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- ray
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- fluorescent screen
- fluorescence coating
- gadolinium oxysulfide
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Abstract
The utility model discloses a kind of fluorescent screen for X-ray detection, including supporting layer and the fluorescence coating that is supported on supporting layer, the fluorescence coating includes gadolinium oxysulfide.Above-mentioned fluorescent screen employs gadolinium oxysulfide, and it can launch visible ray after X-ray is absorbed, and the opto-electronic conversion of X-ray can be realized by coordinating with electrooptical device.
Description
Technical field
The utility model is related to X-ray detection field, more particularly to a kind of fluorescent screen for X-ray detection.
Background technology
The detection of X-ray has important application value, is widely used in industrial non-destructive flaw detection, safety inspection, medical science
Image documentation equipment etc..Especially with the development of electrooptical device, digitized detector continues to bring out out so that these should
With more convenient.X-ray detector is divided into two major classes：Direct-type and indirect-type.So-called Direct-type detector can directly be inhaled
X-ray is received, and converts thereof into electric signal；And indirect-type detector is first to be converted into X-ray from one layer of scintillation material
Optical signal, then will be seen that light is converted into electric signal with electrooptical device again.Direct-type detector, mainly amorphous selenium are detected
, there is the shortcomings of poor to the absorbability of X-ray, operating temperature requirements are harsh in device, using not as indirect-type detector it is extensive.Between
Direct type detector is made up of fluorescent screen and electrooptical device.Electrooptical device mainly has：CCD, CMOS and the pole of silicon photoelectricity two
Pipe etc..And fluorescent screen is one layer of scintillation material in fact, X-ray can be absorbed, and launch visible ray.In scintillation material, tool
There are the CsI fluorescent screens of column structure, higher spatial resolution can be obtained, still, its preparation technology is complicated, prepares cost
It is high；The gadolinium oxysulfide of Ce or Pr doping, is prepared into after scintillating ceramic, is commonly used for CT detectors, is characterized in response speed
Hurry up, twilight sunset it is few, still, luminous efficiency is very low.The gadolinium oxysulfide luminous efficiency of Eu doping is high, but emission wavelength is in 620-
630nm is poorer than the gadolinium oxysulfide that Tb adulterates with matching for amorphous silicon photodiodes；In addition, the gadolinium oxysulfide of Tb doping also has
The features such as having high, strong to X-ray absorption ability luminous efficiency, stable chemical nature, low cost, therefore be especially suitable for applying in X
On ray flat panel detector.Im deok Jung (Im Deok Jung, Min Kook Cho, Sang Min Lee, etc.,
Flexible Gd2O2S：Tb scintillators pixelated with polyethylene microstructures
For digital x-ray image sensors, J.Micromech.Microeng.19 (2009) 015014) and Jongyul
Kim (Jongyul Kim, Bo Kyoung Cha, Jun Hyung Bae, etc., Fabrication and
characterization of pixelated Gd2O2S：Tb scintillator screens for digital X-
Ray imaging applications, Nuclear Instruments and Methods in Physics Research
A 633 (2011) S303-S305) report the gadolinium oxysulfide fluorescent screen with pixellated structure, it is possible to achieve higher space
Resolution ratio, but many, the high cost that preparation technology will be complicated.
Utility model content
Main purpose of the present utility model is to provide a kind of fluorescent screen for X-ray detection, by preparing fluorescence
The material and preparation method of screen improved improve by X-ray be converted into visible ray ability so that improve to X-ray
Detection performance.
To achieve the above objectives, the technical solution adopted in the utility model is：A kind of fluorescent screen for X-ray detection,
Including supporting layer and the fluorescence coating being supported on supporting layer, the fluorescence coating includes gadolinium oxysulfide.
Preferably, reflector layer is provided between supporting layer and fluorescence coating, the fluorescence coating is supported on branch by reflector layer
Support on layer.
Preferably, also including protective layer, the protective layer is supported on fluorescence coating.
Preferably, in the fluorescence coating, gadolinium oxysulfide is also doped with Tb ions.
Preferably, in the fluorescence coating, gadolinium oxysulfide is also at least doped with Dy ions.
Compared with prior art, the utility model has the advantages that：
1) fluorescent screen of the present utility model includes gadolinium oxysulfide, and gadolinium oxysulfide launches visible ray after X-ray is absorbed,
Very high resolution ratio can be realized；The side of fluorescence coating is provided with reflector layer simultaneously, can launch gadolinium oxysulfide is visible
Light is as much as possible to be launched from the opposite side of fluorescence coating, and then detector can receive more visible rays, make detection
Device detects the more efficient of X-ray；
2) fluorescent screen of the present utility model, preparation process is simple, and production cost is low, can effectively improve production efficiency.
Brief description of the drawings
The layer structure schematic diagram of Fig. 1 fluorescent screens of the present utility model
Fig. 2 fluorescent screen operation principle schematic diagrams of the present utility model
The SEM patterns of Fig. 3 gadolinium oxysulfide powders
The particle diameter distribution of Fig. 4 gadolinium oxysulfide powders
The spatial resolution test of Fig. 5 fluorescent screens of the present utility model
Embodiment
Describe to be used to disclose the utility model so that those skilled in the art can realize the utility model below.Retouch below
Preferred embodiment in stating is only used as citing, it may occur to persons skilled in the art that other obvious modifications.
The utility model is related to a kind of fluorescent screen for X-ray flat panel detector, as shown in figure 1, the fluorescent screen is one
Individual sandwich construction, at least including supporting layer 1, reflector layer 2, fluorescence coating 3 and protective layer 4.
Supporting layer 1, to be supported to other layers, can use PET film, paper or similar material, the thickness
Degree is between 50-500 μm.Reflector layer 2, the visible ray launched for reflected fluorescent light layer 3 to reflector layer 2, mainly by Teflon,
ESR reflectance coatings, BaSO4, TiO2, the integument or powder coating of the highly reflective material such as MgO+TiO2 composition, the thickness of this layer
Between a few to tens of microns；Fluorescence coating 3, is topmost one layer in fluorescent screen, to be mainly made up of fluorescent material and bonding agent, glimmering
Light powder is gadolinium oxysulfide, and gadolinium oxysulfide can launch visible ray after X-ray is absorbed, and the thickness of this layer is between 100-900 μm；
Protective layer 4, on the one hand plays a part of sealing and protects fluorescence coating, on the other hand to have high transmission to the visible ray of 3 layers of transmitting
Property, it can use the PET film of high transparency, and the thickness of this layer is between a few to tens of microns.
The workflow of the fluorescent screen being made of gadolinium oxysulfide is as shown in Fig. 2 X-ray enters to come in from supporting layer 1, branch
Support the absorption of layer 1 and supporting layer 2 to X-ray very weak, and because fluorescence coating 3 has highdensity gadolinium oxysulfide, therefore it is penetrated to X
Line absorption is very capable；Gadolinium oxysulfide in fluorescence coating 3 is absorbed after X-ray, launches visible ray, due to the presence of reflector layer 2
So that the visible ray that fluorescence coating 3 is launched to reflector layer 2 reflects to the direction of protective layer 4, and then the visible ray for launching fluorescence coating 3
The overwhelming majority is all gone out from protective layer 4, reaches the electrooptical device coupled with protective layer 4, so as to be converted into electric signal, is completed
The opto-electronic conversion of detector, detector with electric signal according to whether judge whether with X-ray or according to the strong of electric signal
The weak power for judging X-ray.
In fluorescence coating 3, except gadolinium oxysulfide in fluorescent material, also doped with Tb ions, using Tb ions as the centre of luminescence,
With luminous efficiency is high, strong to X-ray absorption ability, stable chemical nature, low cost the features such as.While in order to improve Tb ions
Luminous efficiency, Dy ions can also be co-doped with, now, the chemical formula of fluorescent material is：(Gd1-x-yTbxDyy)2O2S, wherein, x exists
Between 0.001 to 0.02, y is between 0.0005 to 0.02.The Zn ions that can also adulterate a small amount of, doping concentration is in 10-
100ppm, the particle diameter of gadolinium oxysulfide powder is at 1-10 μm.
Preparing above-mentioned fluorescent screen can be by following several approach：
Embodiment 1
Above-mentioned fluorescent screen is prepared to first have to prepare reflector layer and fluorescence coating slurry.Fluorescence coating 3 is made using gadolinium oxysulfide powder
For fluorescent material, its chemical formula is：(Gd1-x-yTbxDyy)2O2S, wherein, x=0.005, y=0.005.The shape of gadolinium oxysulfide powder
Looks are as shown in figure 3, the particle diameter of powder is about at 2-10 μm, such as Fig. 4.Measure gadolinium oxysulfide powder 30g, 0.3g herring oil as point
Powder, 25g ethyl acetate is mixed as organic solvent, 1.8g PVB as bonding agent, 1.2gPEG-400 as plasticiser, ball milling
Close, rotational speed of ball-mill is 120r/min, and the time is 6h, obtains preparing the slurry of fluorescence coating 3.TiO2 is chosen as preparing reflector layer 2
Powder, measure 10gTiO2,0.1g herring oils are used as bonding as dispersant, 35g ethyl acetate as solvent, 0.6gPVB
Agent, 0.4gPEG-400 is as plasticiser, and ball milling mixing, rotational speed of ball-mill is 120r/min, and the time is 6h, obtains preparing reflector layer 2
Slurry.
After the slurry for obtaining preparing fluorescence coating and reflector layer, into the step of preparing fluorescent screen：It is 250 μm to select thickness
PET film is used as supporting layer 1；After film surface processing is clean, the slurry for preparing reflector layer 2 is coated in by PET using the tape casting thin
On film, control thickness is in several microns to more than ten micron；Fluorescence coating 3 will be prepared after the drying of reflector layer 2, then with the tape casting
Slurry is coated in the surface of reflector layer 2, and control thickness is at 250 μm；After being dried Deng fluorescence coating 3, adhesive thickness is made for 12 μm of PET film
For protective layer.
Embodiment 2
Used gadolinium oxysulfide powder is same as Example 1.Measure gadolinium oxysulfide powder 30g, 0.3g herring oil conduct
Dispersant, 10g ethyl acetate and 10g ethanol are used as modeling as organic solvent, 1.8g PVB as bonding agent, 1.2gPEG-400
Agent, ball milling mixing, rotational speed of ball-mill is 120r/min, Ball-milling Time 4h, obtains preparing the slurry of fluorescence coating 3.Made from TiO2
To prepare the powder of reflector layer 2.10gTiO2 is measured, 0.1g herring oils are used as dispersant, 12g ethyl acetate and 12g ethanol conducts
Solvent, 0.6g PVB are as bonding agent, and 0.4gPEG-400 is as plasticiser, and ball milling mixing, rotational speed of ball-mill is 120r/min, ball
Consume time as 4h, obtain preparing the slurry of reflector layer 2.
After the slurry for obtaining preparing fluorescence coating and reflector layer, the step of preparing above-mentioned fluorescent screen is same as Example 1.
Embodiment 3
Used gadolinium oxysulfide powder is same as Example 1.Measure gadolinium oxysulfide powder 30g, 0.3g herring oil conduct
Dispersant, 10g ethyl acetate and 10g ethanol as solvent, 1.8g PVB as bonding agent, 1.2gPEG-400 as plasticiser,
Ball milling mixing, 120r/min, 4h obtain preparing the slurry of fluorescence coating 3.The powder for preparing reflector layer 2 is used as from TiO2.Measure
10gTiO2,0.1g herring oil are as dispersant, and 10g ethyl acetate and 10g ethanol are as organic solvent, and 0.6g PVB are as viscous
Agent is connect, 0.4gPEG-400 is as plasticiser, and ball milling mixing, ball milling speed is 120r/min, and Ball-milling Time is 4h, is prepared
The slurry of reflector layer 2.
After the slurry for obtaining preparing fluorescence coating and reflector layer, the step of preparing above-mentioned fluorescent screen is same as Example 1.
Obtained above-mentioned fluorescent screen is tested, in the case where test condition is 70KV, 5mAs, the space of fluorescent screen
Resolution ratio can reach 3.1LP/mm, and test result is as shown in Figure 5.
Further, it is above-mentioned prepare slurry during, rotational speed of ball-mill can be 60-180r/min, and Ball-milling Time can be with
For 2-24h.
Further, obtain needing after slurry carrying out slurry old, then knifing is carried out to corresponding slurry using the tape casting
To obtain reflector layer 2 or fluorescence coating 3, while controlling the thickness of reflector layer 2 or fluorescence coating 3 by controlling the height of scraper
Degree.
When preparing slurry, bonding agent can select ethyl cellulose, polyvinyl butyral resin, cellulose acetate, poly-vinegar
Vinyl acetate etc..In ball milling, it is that organic solvent can in order to which binding agent and powder can be mixed preferably to add organic solvent
To select alcohol, dimethylbenzene, ethyl acetate, ether etc..Addition dispersant and plasticiser can improve reflector layer 2 and fluorescence coating 3
Packed density and intensity, dispersant can select phthalic acid, stearic acid, herring oil etc., and plasticiser can select phosphoric acid
Triphenylmethyl methacrylate, diethyl phthalate etc..
The fluorescent screen absorbs the visible wavelength launched after X-ray in 520-580nm, the wave-length coverage and silicon photoelectricity two
The best effort commensurate in scope of pole pipe is good, therefore photoelectric transformation efficiency is high.The fluorescent screen and silicon photoelectric diode, or it is other
Electrooptical device, such as：CCD, CMOS etc., can be assembled into X-ray flat panel detector, can be applied to X-ray detection field,
Such as：Industrial non-destructive flaw detection, safety inspection and medical imaging device etc..
General principle of the present utility model, principal character and advantage of the present utility model has been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the utility model is not restricted to the described embodiments, described in above-described embodiment and specification
Simply principle of the present utility model, the utility model also has respectively on the premise of the utility model spirit and scope are not departed from
Changes and improvements are planted, these changes and improvements are both fallen within the range of claimed the utility model.The utility model requirement
Protection domain defined by appending claims and its equivalent.
Claims (4)
1. a kind of fluorescent screen for X-ray detection, it is characterised in that at least including supporting layer, reflector layer, fluorescence coating and protection
Layer, protection is placed on above supporting layer, and fluorescence coating and reflector layer are provided between protective layer and supporting layer, and the fluorescence coating leads to
Cross reflector layer to be supported on supporting layer, the fluorescence coating includes gadolinium oxysulfide.
2. a kind of fluorescent screen for X-ray detection according to claim 1, it is characterised in that the fluorescent layer thickness
Between 100-900 μm.
3. a kind of fluorescent screen for X-ray detection according to claim 1, it is characterised in that the protective layer is thickness
The PET film of 12 μm of degree.
4. a kind of fluorescent screen for X-ray detection according to claim 1, it is characterised in that the supporting layer is thickness
The PET film of 250 μm of degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621146513.4U CN206322481U (en) | 2016-10-24 | 2016-10-24 | A kind of fluorescent screen for X-ray detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621146513.4U CN206322481U (en) | 2016-10-24 | 2016-10-24 | A kind of fluorescent screen for X-ray detection |
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| Publication Number | Publication Date |
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| CN206322481U true CN206322481U (en) | 2017-07-11 |
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| CN201621146513.4U Expired - Fee Related CN206322481U (en) | 2016-10-24 | 2016-10-24 | A kind of fluorescent screen for X-ray detection |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373631A (en) * | 2016-10-24 | 2017-02-01 | 上海健康医学院 | Fluorescent screen for X ray detection and preparation method thereof |
| CN110473650A (en) * | 2019-07-11 | 2019-11-19 | 长春理工大学 | Stacked anti-crosstalk x-ray fluorescence screen |
-
2016
- 2016-10-24 CN CN201621146513.4U patent/CN206322481U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373631A (en) * | 2016-10-24 | 2017-02-01 | 上海健康医学院 | Fluorescent screen for X ray detection and preparation method thereof |
| CN106373631B (en) * | 2016-10-24 | 2024-05-10 | 上海健康医学院 | Fluorescent screen for X-ray detection and preparation method thereof |
| CN110473650A (en) * | 2019-07-11 | 2019-11-19 | 长春理工大学 | Stacked anti-crosstalk x-ray fluorescence screen |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170711 Termination date: 20191024 |
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| CF01 | Termination of patent right due to non-payment of annual fee |