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

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

CN104508192AInactive Publication Date: 2015-04-08ZECOTEK PHOTONICS INC
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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

Patent Timeline
08 Apr 2015
Publication
CN104508192A
IPC
C30B29/34; C09K11/77; C30B15/00; C03B17/00; G01T1/164; G06T1/20; G01T1/202
CPC
C30B29/34; C09K11/7792; C30B33/02; C30B15/00; C09K11/7795; C30B17/00; C09K11/7783; C09K11/7774
Inventors
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