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Rare-earth scintillation crystals prepared from low-cost rare-earth raw materials and their low-cost growth process

A technology of scintillation crystal and crystal growth, which is applied in the directions of crystal growth, single crystal growth, single crystal growth, etc., and can solve problems hindering the application in the field of detection

Active Publication Date: 2018-06-01
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the expensive cost of rare earth scintillation crystals has become a shackle in its application field, and has hindered further wider application in the field of detection. How to reduce production costs and obtain low-cost rare earth scintillation crystals and their growth process has become an issue. Problems to be solved urgently by frontier scholars in the field of application

Method used

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  • Rare-earth scintillation crystals prepared from low-cost rare-earth raw materials and their low-cost growth process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] According to the above raw material preparation process, the trivalent cerium ion-doped yttrium lutetium silicate crystal polycrystalline raw material is prepared. The high temperature solid phase reaction is as follows:

[0077] 2xO 2 +yY 2 o 3 +(1-x-y)Lu 2 o 3 +SiO2 2 →(Ce x Lu 1-x-y Y y ) 2 SiO 5 +1 / 2O 2 ↑

[0078] Lu with a purity of 99.9% 2 o 3 , Y 2 o 3 , CeO 2 and SiO 2 , after three-stage series crystallization, Lu with a purity greater than 99.995% was obtained 2 o 3 , Y 2 o 3 , CeO 2 and SiO 2 High-purity raw materials, according to (CeYLu) 2 o 3 :SiO2 2 = 1.1, CeO 2 :( 2 o 3 +Lu 2 o 3 )=0.01, Y 2 o 3 :Lu 2 o 3 =0.18 Proportioning Accurately weigh 2400g, put into the mixer after batching and fully mix for 28 hours, so that the raw materials are evenly mixed. Press the raw material cake under 30MPa, put the raw material cake into the high-purity crucible, and then put it into a part of the reducing atmosphere N 2 +H 2Sinte...

Embodiment 2

[0083] According to the above raw material preparation process, the trivalent cerium ion-doped yttrium lutetium silicate crystal polycrystalline raw material is prepared. The high temperature solid phase reaction is as follows:

[0084] 2xO 2 +yY 2 o 3 +(1-x-y)Lu 2 o 3 +SiO2 2 →(Ce x Lu 1-x-y Y y ) 2 SiO 5 +1 / 2O 2 ↑

[0085] Lu with a purity greater than 99.995% 2 o 3 , Y 2 o 3 , CeO 2 , SiO 2 High-purity raw materials according to (CeYLu) 2 o 3 :SiO2 2 =0.85, CeO 2 :( 2 o 3 +Lu 2 o 3 )=0.008, Y 2 o 3 :Lu 2 o 3 =0.15 Proportioning Accurately weigh 2400g, put into the mixer after batching and fully mix for 28 hours, so that the raw materials are evenly mixed. Press the raw material cake under 30MPa, put the raw material cake into the high-purity crucible, and then put it into a part of the reducing atmosphere N 2 +H 2 Sintering at 1100°C under protection to form a polycrystalline block. The cerium-doped yttrium-lutetium silicate crystal is dire...

Embodiment 3

[0088] According to the above raw material preparation process, the gadolinium lutetium silicate crystal polycrystalline raw material doped with trivalent cerium ions is prepared. The high temperature solid phase reaction is as follows:

[0089] 2xO 2 +yGd 2 o 3 +(1-x-y)Lu 2 o 3 +SiO2 2 →(Ce x Lu 1-x-y Gd y ) 2 SiO 5 +1 / 2O 2 ↑

[0090] Lu with a purity greater than 99.99% 2 o 3 、Gd 2 o 3 , CeO 2 , SiO 2 High-purity raw materials according to (CeGdLu) 2 o 3 :SiO2 2 =1.15, CeO 2 :( 2 o 3 +Lu 2 o 3 )=0.03, Gd 2 o 3 :Lu 2 o 3 =0.15 Proportioning Accurately weigh 5500g, put into a mixer and mix thoroughly for 48 hours after batching, so that the raw materials are evenly mixed. Press the raw material cake under 55MPa, put the raw material cake into the high-purity crucible, and put it into the partial reducing atmosphere N 2 +H 2 Sintering at 1100°C under protection to form a polycrystalline block. Directional pulling and growth of cerium-doped yttr...

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Abstract

The invention provides low-cost rare earth scintillation crystals, which are obtained after crystal growth of RE2O3, silicon dioxide, cerium oxides and lutetium oxides; the sum of the mass of RE2O3, cerium oxides and lutetium oxides is equal to The ratio of the mass of silicon dioxide is (0.75-1.25): 1; the ratio of the mass of the oxide of cerium to the sum of the mass of the oxides of RE2O3 and lutetium is (0.005-0.04): 1; The mass ratio of RE2O3 and lutetium oxide is (0.005-1):1. The present invention determines the ratio of raw materials according to the composition-temperature relationship in the consistent melting zone of crystal growth. The invention adopts a specific raw material ratio to effectively reduce the liquid / solid phase transition temperature point in the scintillation crystal growth process, reduce crystal growth energy consumption, precious metal loss, rapid growth process is conducive to shortening the growth time, high crystal yield, and obvious advantages Low cost advantage.

Description

technical field [0001] The invention relates to the technical field of scintillation crystal materials, in particular to a rare earth scintillation crystal prepared from low-cost rare earth raw materials and a low-cost growth process. Background technique [0002] Scintillation crystals refer to crystals that can convert the kinetic energy of high-energy particles into light energy and emit flashes under the impact of high-energy particles such as X-rays and radiation. Scintillation, on the other hand, refers to a radioluminescent process that converts high-energy rays or particles into pulses of ultraviolet or visible fluorescence. The main application fields of scintillation crystals are high energy physics, nuclear physics, nuclear medicine (such as XCT, PET and g camera), industrial application (industrial CT), geological exploration, oil well logging, etc. Scintillation crystals can emit light waves in the visible light band under the excitation of rays. The maximum sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/34C30B15/36C09K11/79
CPCC09K11/7774C30B15/36C30B29/34
Inventor 薛冬峰孙丛婷
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI