CN110967723A - Scintillator with multistage light intensity adjustment - Google Patents

Scintillator with multistage light intensity adjustment Download PDF

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Publication number
CN110967723A
CN110967723A CN201911380982.0A CN201911380982A CN110967723A CN 110967723 A CN110967723 A CN 110967723A CN 201911380982 A CN201911380982 A CN 201911380982A CN 110967723 A CN110967723 A CN 110967723A
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scintillator
light intensity
metal layer
crosstalk
top surface
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CN201911380982.0A
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江亚林
秦海明
王新佳
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Ningbo Qiandong Kehao Optoelectronics Technology Co ltd
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Ningbo Qiandong Kehao Optoelectronics Technology Co ltd
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Publication of CN110967723A publication Critical patent/CN110967723A/en
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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
    • G01T1/2002—Optical details, e.g. reflecting or diffusing layers

Abstract

The invention discloses a scintillator with multistage light intensity adjustment, which comprises a plurality of scintillator elements arranged in an array structure at intervals, wherein each scintillator element comprises: a top surface and a plurality of side surfaces for receiving radiation, a first reflective layer covering the top surface and a second reflective layer covering the side surfaces; a carbon film is arranged between the top surface and the first reflecting layer, and the first reflecting layer is covered with the sharpening sheet; and an anti-crosstalk metal layer is arranged between adjacent scintillator elements. The anti-crosstalk metal layer is made of one or more metals with atomic number more than or equal to 60; the sharpening sheet is made of one or more metal materials with atomic number less than or equal to 30. According to the invention, the ray is sharpened through the sharpening sheet, so that low-energy ray signals are cut off, and the high-energy ray signals are more uniform; the carbon film with the nanometer-level thickness can generate diffraction enhancement with rays, and the uniformity and the energy intensity of the rays are increased; the crosstalk-proof metal layer reduces mutual crosstalk of rays and guarantees stability of output signals.

Description

Scintillator with multistage light intensity adjustment
Technical Field
The present invention relates generally to apparatus for detecting radiation in CT imaging and other radiation imaging systems, and more particularly to a scintillator with multi-level adjustment of light intensity.
Background
The scintillation detector is a device which converts high-energy rays (such as X/gamma rays) into ultraviolet light or visible light, converts optical signals into electric signals through photon detection equipment such as a photomultiplier tube and the like, and finally presents information of interaction between the high-energy rays and detected substances in the form of digital signals. At present, the scintillation detector is widely applied to the fields of medical treatment, national defense, security inspection and the like. The most central functional component in the scintillation detector is a scintillator array, which is a medium for converting high-energy rays and optical signals. The scintillator array is formed by arranging a plurality of scintillator elements in a two-dimensional array, when light is transmitted in the traditional scintillator array, energy nonuniformity exists due to high-energy rays which enter each scintillator element, crosstalk of the high-energy rays and electrons can be generated between adjacent scintillator elements, nonuniformity of emergent light intensity can be caused, and stability of output signals is further poor.
The emergent uniformity and the emergent rate of light in the scintillator array are improved, so that on one hand, the radiation dose of high-energy rays under the same detection signal output condition is reduced, and a green and safe detection device is created; meanwhile, the difficulty of receiving and processing signals at the rear end of the detector can be reduced, and the manufacturing cost of the detector matching equipment is further reduced.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a scintillator capable of adjusting light intensity in multiple steps, which improves the uniformity and the ratio of emission of X-rays by adjusting the light intensity in multiple steps.
Aiming at the problems, the invention adopts a technical scheme that: the scintillator for multi-level adjustment of light intensity is provided, which comprises a plurality of scintillator elements arranged in an array structure with gaps therebetween, wherein each scintillator element comprises:
a top surface and a plurality of sides for receiving radiation; a reflective layer comprising a first reflective layer covering the top surface and a second reflective layer covering the side surfaces; the method is characterized in that:
a carbon film is disposed between the top surface and the first reflective layer.
Furthermore, the thickness of the carbon film is 0.01-10 nm.
Further, the scintillator element further comprises a sharpening sheet covering the first reflective layer.
Further, a crosstalk-proof metal layer is arranged between the adjacent scintillator elements, and the crosstalk-proof metal layer is arranged between the second reflecting layers of the adjacent scintillator elements.
Further, the scintillator element includes: scintillation crystals, scintillation glass, scintillation ceramics and plastic scintillators; the scintillation crystal comprises thallium-doped sodium iodide (NaI: Tl), thallium-doped cesium iodide (CsI: Tl), and bismuth germanate (Bi)4Ge3O12BGO), cerium-doped lutetium yttrium silicate ((Lu, Y)2SiO5Ce, LYSO), cadmium tungstate (CdWO)4CWO), barium fluoride (BaF)2) Cerium-doped lanthanum chloride (LaCl)3Ce), cerium-doped lanthanum bromide (LaBr)3Ce), cerium-doped yttrium lithium dicesium hexachloride (Cs)2LiYCl6Ce, CLYC), cerium-doped gadolinium-aluminum garnet structure (Gd)3(Al,Ga)5O12Ce, GGAG); the scintillating ceramic is of a garnet structure, and the structural formula can be expressed as follows: (AB)3+xC5-xO12Wherein: a is a luminescent rare earth element which can be Ce, Pr, Nd, Eu, Tb, Er, Dy, Tm, Ho or a combination thereof; b can be Sc, Y, Gd, Yb, Lu or a combination thereof; c may be Al, Ga or a combination of Al and Ga;
the scintillating ceramic can also be (Gd)1-x-yPrxDy)2O2S ceramic, wherein D can be one or two of Ce, Pr, Eu, Nd, Sm, Gd, Ho, Yb and Tm.
Furthermore, the reflecting layer is made of epoxy resin mixed with a reflecting medium; the thickness of the first reflecting layer is 0.1-3 mm; the thickness of the second reflecting layer is 0.1-1.0 mm.
Furthermore, the crosstalk-proof metal layer is composed of one or more metals with atomic number not less than 60.
Furthermore, the thickness of the anti-crosstalk metal layer is 0.1-0.3 mm.
Furthermore, the crosstalk prevention metal layer is composed of one or more of W, Pt, Au and Pb.
Furthermore, the sharpening sheet is made of one or more metal materials with atomic numbers less than or equal to 30.
Furthermore, the sharpening sheet is 0.2-1.0 mm thick.
Furthermore, the sharpening sheet is made of one or more materials of Al and Cu, and the thickness of the sharpening sheet is 0.2-1.0 mm.
The invention has the beneficial effects that: the sharpening sheet can sharpen the ray, cut off the low-energy ray signal and ensure that the high-energy ray signal is more uniform; the carbon film with the nanometer-level thickness has the wavelength matched with the rays, can perform coherent diffraction with the rays, and increases the uniformity and the energy intensity of the rays; the crosstalk prevention metal layer plays a role in reducing mutual crosstalk of rays and guarantees stability of output signals.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of a comparative example of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1, the structure of the embodiment of the present invention is shown as follows: the scintillator capable of adjusting light intensity in multiple stages comprises a plurality of scintillator elements 1, wherein the scintillator elements 1 are arranged in a two-dimensional array structure at intervals, and the width d of a gap between every two adjacent scintillator elements 1 is 0.4 mm.
Each of the scintillator cells 1 includes: a top surface and a plurality of sides for receiving radiation; the top surface is sequentially covered with a carbon film 2, a first reflecting layer 3 and a sharpening sheet 4 from inside to outside, the side surface is covered with a second reflecting layer 5, a crosstalk-proof metal layer 6 is arranged between the adjacent scintillator elements 1, and the crosstalk-proof metal layer 6 is arranged between the second reflecting layers 3 of the adjacent scintillator elements 1. The carbon film 2, the first reflecting layer 3 and the sharpening sheet 4 are matched with the top surface of the scintillator in size; the first reflecting layer 3 and the second reflecting layer 5 are both made of epoxy resin doped with reflecting media; the thickness of the first reflective layer 3 is: the thickness of the second reflective layer 5 is 0.5mm, which is the thickness of the d-crosstalk prevention metal layer 6.
Examples 1 to 12 were formed by changing the thickness of the carbon film 2 in the scintillator, the material and thickness of the sharpening sheet 4, and the material and thickness of the crosstalk preventing metal layer 6, under the condition that the overall size of the scintillator and the size of the single scintillator element 1 were the same.
FIG. 2 is a schematic diagram of a scintillator according to a comparative example of the present invention. The scintillator structure in the comparative example of the present invention includes: a plurality of scintillator elements 1 ', the scintillator elements 1' being arranged in a two-dimensional array structure with a gap therebetween, a gap width d 'between adjacent scintillator elements 1' being 0.4 mm. Each scintillator cell 1' includes: a top table and a plurality of sides for receiving radiation; the top surface is covered with a first reflecting layer 3 ', the side surface is covered with a second reflecting layer 5', and the first reflecting layer 3 'and the second reflecting layer 5' are both made of epoxy resin doped with a reflecting medium; the thickness of the first reflective layer 3' is 0.5 mm: the thickness of the second reflective layer 5' is: 0.4 mm; the overall scintillator size in the comparative example of the present invention was the same as that in the example, and the size of the single scintillator cell 1' in the comparative example of the present invention was the same as that of the scintillator cell 1 in the example. Comparative examples 1 to 5 were formed by changing the material of the scintillator element 1'.
The uniformity and light output intensity of each pixel in each scintillator sample of examples 1 to 12 and comparative examples 1 to 5 were examined and are shown in Table 1.
Figure BDA0002342231660000041
Figure BDA0002342231660000051
As can be seen from the above table: the carbon film is arranged on the radiation surface of the scintillator, so that the uniformity and the light output effect of each pixel of the scintillator can be improved, and the sharpening sheet and the crosstalk metal layer are arranged, so that the effect can be further enhanced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A scintillator for multi-level adjustment of light intensity, comprising a plurality of scintillator cells arranged in an array structure with a gap therebetween, each of the scintillator cells comprising:
a top surface and a plurality of sides for receiving radiation; a reflective layer comprising a first reflective layer covering the top surface and a second reflective layer covering the side surfaces; the method is characterized in that:
a carbon film is disposed between the top surface and the first reflective layer.
2. The scintillator with multi-level adjustable light intensity as claimed in claim 1, wherein the carbon film has a thickness of 0.01 to 10 nm.
3. The scintillator of claim 1 wherein the scintillator element further comprises a sharpened sheet overlying the first reflective layer.
4. The scintillator with multilevel modulated light intensity as claimed in claim 1 or 3, wherein a crosstalk prevention metal layer is disposed between adjacent scintillator elements, and the crosstalk prevention metal layer is disposed between the second reflective layers of the adjacent scintillator elements.
5. The scintillator for multi-level adjustment of light intensity as claimed in claim 1, wherein the scintillator elements comprise: scintillation crystals, scintillation glass, scintillation ceramics and plastic scintillators; the scintillation crystal comprises thallium-doped sodium iodide (NaI: Tl), thallium-doped cesium iodide (CsI: Tl), and bismuth germanate (Bi)4Ge3O12BGO), cerium-doped lutetium yttrium silicate ((Lu, Y)2SiO5Ce, LYSO), cadmium tungstate (CdWO)4CWO), barium fluoride (BaF)2) Cerium-doped lanthanum chloride (LaCl)3Ce), cerium-doped lanthanum bromide (LaBr)3Ce), cerium-doped yttrium lithium dicesium hexachloride (Cs)2LiYCl6Ce, CLYC); the scintillating ceramic is of a garnet structure, and the structural formula can be expressed as follows: (AB)3+xC5-xO12Wherein: a is a luminescent rare earth element which can be Ce, Pr, Nd, Eu, Tb, Er, Dy, Tm, Ho or a combination thereof; b can be Sc, Y, Gd, Yb, Lu or a combination thereof; c may be Al, Ga or a combination of Al and Ga;
the scintillating ceramic can also be (Gd)1-x-yPrxDy)2O2S ceramic, wherein D can be one or two of Ce, Pr, Eu, Nd, Sm, Gd, Ho, Yb and Tm.
6. The scintillator with multi-level adjustable light intensity as claimed in claim 4, wherein the metal layer for preventing crosstalk is made of one or more metals with atomic number greater than or equal to 60.
7. The scintillator with multilevel modulated light intensity as claimed in claim 6, wherein the thickness of the metal layer is 0.1-0.3 mm.
8. The scintillator with multi-level adjustable light intensity as claimed in claim 6, wherein the metal layer for preventing crosstalk is made of one or more of W, Pt, Au, and Pb.
9. The scintillator of claim 3 wherein the sharpening sheet is made of one or more metallic materials having an atomic number less than or equal to 30.
10. The scintillator of claim 9, wherein the sharpening sheet is made of one or more of Al and Cu, and has a thickness of 0.2-1.0 mm.
CN201911380982.0A 2019-12-27 2019-12-27 Scintillator with multistage light intensity adjustment Pending CN110967723A (en)

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