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Multi-doped lutetium based oxyorthosilicate scintillators having improved photonic properties

A technology of orthosilicate and scintillation crystals, applied in the field of manufacturing and using the scintillation substances described in this paper, co-doped and multi-co-doped lutetium-based oxyorthosilicate scintillators, which can solve the difference in light yield Obvious problems such as low light yield and no announcement of crystal growth conditions have achieved the effect of improving crystal growth parameters and improving scintillation parameters

Inactive Publication Date: 2015-04-08
ZECOTEK PHOTONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A disadvantage of known scintillation materials is that the important properties of scintillation, namely light yield and energy resolution, have a large distribution among crystals grown from a single ingot
The obvious disadvantage of these large size Ce:LSO ingots is that even within the ingot, the light yield varies significantly - the light yield decreases by 30%-40% from the top to the bottom of the ingot
The main disadvantage of the above-mentioned invention is: due to the use of silicon concentration Si 1.00 and expensive Lu with a chemical purity of 99.99% or 99.998% 2 o 3 Used to grow LSO crystals and LYSO crystals, so oxygen vacancies appear
The second disadvantage is that the two-step manufacturing technique
Crystal growth conditions for the samples studied were not published

Method used

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  • Multi-doped lutetium based oxyorthosilicate scintillators having improved photonic properties
  • Multi-doped lutetium based oxyorthosilicate scintillators having improved photonic properties
  • Multi-doped lutetium based oxyorthosilicate scintillators having improved photonic properties

Examples

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Embodiment 1

[0180] A scintillation material having an emission maximum in the range of about 400 nm to 450 nm and based on a silicate comprising lutetium (Lu) and cerium (Ce), characterized in that the composition of the scintillation material is given by the chemical formula (Lu 2-w-x+2y A w Ce x Si 1-y ) 1-z Me z J j o q means and is characterized in that the scintillation material is crystalline. 99.99% pure oxide chemistry (Lu 2 o 3 , CeO 2 , SiO 2 ) for growth by the Czochralski method (CZ) of the boule. The content of cerium in the top of the boule needs to be about 3 x 10 -4 f. units. Considering that the segregation coefficient of cerium ions between the melt and the growing crystal is equal to about k=0.2, it is necessary to load the crucible with a starting material having a cerium concentration of 0.0015 f.units.

[0181] Under a protective inert atmosphere (100% volume nitrogen), at 1.2mm h -1 CZ growth of crystals was performed from an iridium crucible with a di...

Embodiment 2

[0185] A scintillation material having an emission maximum in the range of about 400 nm to 450 nm and based on a silicate comprising lutetium (Lu) and cerium (Ce), characterized in that the composition of the scintillation material is given by the chemical formula (Lu 2-w-x+2y A w Ce x Si 1-y ) 1-z Me z J j o q means and is characterized in that the scintillation material is crystalline. 99.99% pure oxide chemistry (Lu 2 o 3 , CeO 2 , SiO 2 ) for growth from the Czochralski method (CZ) of the boule.

[0186] CZ growth of crystals was performed from an iridium crucible in a protective nitrogen atmosphere. Polished samples from the top and bottom of the ingot were used to measure parameters and chemical compositions (Table 1). The crystal composition at the top is Ce 0.00053 Lu 2.009 sc 0.0033 Si 0.995 o 5.005 And the component molar ratio (Lu+Ce+Sc) / Si=2.02. The concentration of doping ions is Ce=165ppmw (5×10 -4 f.units) and Sc=315ppmw (3×10 -3 f. units). ...

Embodiment 3

[0191] A scintillation material having an emission maximum in the range of about 400 nm to 450 nm and based on a silicate comprising lutetium (Lu) and cerium (Ce), characterized in that the composition of the scintillation material is given by the chemical formula (Lu 2-w-x+2y A w Ce x Si 1-y ) 1-z Me z J j o q and (Lu 2-w-x-2y A w Ce x Si 1+y ) 1-z Me z J j o q Denotes and is characterized in that the scintillation material is a ceramic, wherein J is at least one element selected from N, F, P, S, Cl and j = 0.03 f.u.

[0192] 99.99% pure chemical substance (Lu 2 o 3 , CeO 2 , SiO 2 , Y 2 o 3 、LuCl 3 、LuPO 4 、LuF 3 、Gd 2 S 3 ) for the synthesis of pellets with a diameter of 8 mm and a length of 15 mm. Ce-doped lutetium yttrium oxyorthosilicate with additive LuCl at 2000 atmospheres 3 、LuPO 4 、LuF 3 、Gd 2 S 3 Pressurize. After 12 hours the pellets were annealed at a temperature of about 1750° C. in a protective inert atmosphere.

[0193] Polished...

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Abstract

The present invention relates to a set of multi-doped cerium-activated scintillation materials of the solid solutions on the basis of the rare earth silicate, comprising lutetium and having compositions represented by the chemical formulas: (Lu2-w-x+2yAwCexSi1-y)1-zMezJjOq and (Lu2-w-x-2yAwCexSi1+y)1-zMezJjOq. The invention is useful for detection of elementary particles and nuclei in high-energy physics, nuclear industry; medicine, Positron Emission Tomography (TOF PET and DOI PET scanners) and Single Photon Emission Computed Tomography (SPECT), Positron Emission Tomography with Magnetic Resonance imaging (PET / MR); X-ray computer fluorography; non-destructive testing of solid state structure, including airport security systems, the Gamma-ray systems for the inspection of trucks and cargo containers.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority of US Provisional Application No. 61 / 624,227, filed April 13, 2012, the entire contents of which application is incorporated herein by reference for all purposes. technical field [0003] The present invention relates generally to scintillation materials, and more particularly to co-doped and multi-co-doped lutetium-based oxyorthosilicate scintillators (crystals and ceramics) with improved optical properties such as, for example, increased radiation hardness. The invention also includes related methods of making and using the scintillation substances described herein. Background technique [0004] where x is in 2×10 -4 to 3×10 -2 Variation between the bounds of cerium-doped lutetium oxyorthosilicate Ce 2x Lu 2(1-x) SiO 5 The scintillating substances / crystals are known (US Patent No. 4,958,080, Sep. 18, 90). Crystals of this composition start from the composition of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/34C09K11/77C30B15/00C03B17/00G01T1/164G06T1/20G01T1/202
CPCC30B29/34C09K11/7792C30B33/02C30B15/00C09K11/7795C30B17/00C09K11/7783C09K11/7774C09K11/77742
Inventor 亚历山大·约瑟福维奇·扎古缅内尤里·德米特里韦凯·扎瓦尔特夫谢尔盖·亚历山德罗维奇·库托沃伊瓦伦丁·阿列克谢耶维奇·科兹洛夫法齐·阿卜杜勒穆奈梅·泽鲁克米哈伊尔·瓦西列维奇·扎韦尔特亚耶夫
Owner ZECOTEK PHOTONICS INC
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