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A kind of composite structure transparent scintillation ceramics and preparation method thereof

A technology of scintillation ceramics and composite structure, applied in the field of radiation detection, can solve problems such as being unsuitable for rapid mass production, long period of single crystal preparation, affecting the optical transmission of detection modules, etc.

Active Publication Date: 2020-10-23
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation cycle of single crystal is long, the preparation temperature is high, and the cost is high, which is not suitable for rapid mass production
In addition, since single crystals cannot realize the one-time preparation of two different scintillation material composite structures, different types of single crystals must be prepared first, and then physically stacked together after cutting and polishing.
In addition, there may be light refraction between different single crystal interfaces, which affects the light transmission in the detection module and weakens the performance of depth detection

Method used

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  • A kind of composite structure transparent scintillation ceramics and preparation method thereof
  • A kind of composite structure transparent scintillation ceramics and preparation method thereof
  • A kind of composite structure transparent scintillation ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Using commercial high-purity Lu 2 o 3 (99.99%), Al 2 o 3 (99.99%) and Pr 6 o 11 (99.99%) powder is the initial raw material, according to (Lu 0.997×1.02 PR 0.003 ) 3 Al 5 o 12 The chemical formula of the commercial powder was weighed in proportion, and absolute ethanol was used as the ball milling medium, and ball milled at 200rmp / min for 10h. After the ball-milled slurry is dried and sieved, it is heat-treated at 800° C. to obtain one layer of scintillation ceramic raw material powder. Using commercial high-purity Lu 2 o 3 (99.99%), Al 2 o 3 (99.99%) and CeO 2 (99.99%) powder is the initial raw material, according to (Lu 0.995×1.02 Ce 0.005 ) 3 Al 5 o 12 The chemical formula is weighed, and the same ball milling process is used to obtain another layer of scintillation ceramic raw material powder. Two layers of ceramic raw material powders were dry-pressed to obtain a 2mm green body, and the two layers of ceramic green bodies were superimposed, and c...

Embodiment 2

[0056] Using commercial high-purity Lu 2 o 3 (99.99%), Al 2 o 3 (99.99%) and Pr 6 o 11 (99.99%) powder is the initial raw material, according to (Lu 0.997 PR 0.003 ) 3 Al 5 o 12 The chemical formula of the commercial powder was weighed in proportion, and absolute ethanol was used as the ball milling medium, and ball milled at a speed of 150rmp / min for 10h. After the ball-milled slurry is dried and sieved, it is heat-treated at 800° C. to obtain a layer of scintillation ceramic raw material powder. Using commercial high-purity Lu 2 o 3 (99.99%), Al 2 o 3 (99.99%) and CeO 2 (99.99%) powder is the initial raw material, according to (Lu 0.995×1.02 Ce 0.005 ) 3 Al 5 o 12 Weigh the commercial powder in proportion, use 0.01wt% MgO as a sintering aid, and use the same follow-up process to obtain another layer of scintillation ceramic raw material powder. The two layers of ceramic raw material powders were dry-pressed to obtain biscuits with a thickness of 1mm ((Lu ...

Embodiment 3

[0058] Using commercial high-purity Lu 2 o 3 (99.99%), Al 2 o 3 (99.99%) and Pr 6 o 11 (99.99%) powder is the initial raw material, according to (Lu 0.997 PR 0.003 ) 3 Al 5 o 12 The chemical formula of the commercial powder was weighed in proportion, and absolute ethanol was used as the ball milling medium, and ball milled at 200rmp / min for 10h. After the ball-milled slurry is dried and sieved, it is heat-treated at 800° C. to obtain a layer of scintillation ceramic raw material powder. Using commercial high-purity Lu 2 o 3 (99.99%), Al 2 o 3 (99.99%), Gd 2 o 3 (99.99%) and CeO 2 (99.99%) powder is the initial raw material, according to (Lu 0.5 Gd 0.495 Ce 0.005 ) 3 Al 5 o 12 The chemical formula is weighed, and 0.01wt% MgO is used as a sintering aid, and another layer of scintillation ceramic raw material powder is obtained by the same subsequent process. The two layers of ceramic raw material powders were respectively dry-pressed to obtain biscuits wit...

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Abstract

The invention relates to composite structure transparent scintillation ceramic and a preparation method thereof. The composite structure transparent scintillation ceramic comprises a Pr doped garnet-based scintillation ceramic layer and a Ce doped garnet-based scintillation ceramic layer, wherein the composition general formula of the Pr doped garnet-based scintillation ceramic layer is [LuaYbPrc]3[Al(1-d)Gad]5O12, wherein a is greater than or equal to 0 but smaller than 1.06; b is greater than or equal to 0 but smaller than 1.06; c is greater than 0 but smaller than or equal to 0.08; d is greater than or equal to 0 but smaller than or equal to 1; the sum of a, b and c is greater than or equal to 0.98 but smaller than or equal to 1.06; the composition general formula of the Ce doped garnet-based scintillation ceramic layer is [LuxYyGdzCem]3[Al(1-n)Gan]5O12, wherein x is greater than or equal to 0 but smaller than 1.06; y is greater than or equal to 0 but smaller than 1.06; z is greaterthan or equal to 1 but smaller than 1.06; m is greater than 0 but smaller than or equal to 0.05; n is greater than or equal to 0 but smaller than or equal to 1.0; the sum of x, y, z and m is greaterthan or equal to 0.98 but smaller than or equal to 1.06.

Description

technical field [0001] The invention belongs to the field of radiation detection and provides a composite structure transparent scintillation ceramic and a preparation method thereof. Background technique [0002] Scintillators can effectively absorb high-energy rays or particles (X-rays, gamma photons, accelerated charged particles, neutrons) and convert them into ultraviolet or visible light. Scintillation detectors composed of scintillators as core components are widely used in various ionizing radiation and nuclear radiation detection. [0003] In a positron emission tomography (PET) scanner, the length of the scintillation material in the radial direction will produce a certain depth effect, resulting in poor image resolution around the field of view. Researchers proposed a multi-layer scintillator module with depth information detection function to improve the spatial resolution performance of PET. The multilayer scintillator modules are composed of scintillation mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/202
CPCB32B18/00C04B35/44C04B35/622C04B2235/3206C04B2235/3224C04B2235/3229C04B2235/3286C04B2235/656C04B2235/6581C04B2235/662G01T1/2023
Inventor 李江胡泽望潘裕柏石云寇华敏谢腾飞陈昊鸿曹茂庆陈肖朴吴乐翔杨朝翔
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI