Europium-doped scandium oxide scintillator, preparation method and uses thereof

A scandium oxide and scintillator technology, applied in the field of low afterglow scintillation materials, can solve the problems of high afterglow, dynamic and high-resolution X-imaging applications, and achieve high scintillation efficiency

Active Publication Date: 2018-09-28
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a europium-doped scandium oxide scintillator and its preparation method and application, which are used to solve the problem of high afterglow in the prior art that is not conducive to dynamic high-resolution X-ray imaging. Domain Application Issues

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  • Europium-doped scandium oxide scintillator, preparation method and uses thereof
  • Europium-doped scandium oxide scintillator, preparation method and uses thereof

Examples

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Embodiment 1

[0068] Preparation of Sc 1.98 Eu 0.02 o 3 Scintillation single crystal, in this embodiment x is 0, y is 0.01.

[0069] Sc with a commercially available purity of 4N 2 o 3 、Eu 2 o 3 Powder is the raw material. Accurately weigh a certain mass of Sc according to the stoichiometric ratio of the above elements 2 o 3 and Eu 2 o 3 Raw material, doped Eu 2 o 3 Mix evenly with the matrix raw material, put it into an oil-resistant rubber tube, and bake it in a high-temperature furnace at 1700°C for 3 hours after isostatic pressing at 200 MPa. It is an Xe lamp, the growth atmosphere is air, the crystal growth rate is 5mm / h, and the rod rotation speed is 5rpm. After the crystal growth is completed, the temperature is slowly lowered to room temperature, and the crystal is obtained. The obtained crystal is taken off, cut and processed, and polished on both sides. The sample diameter is about 4.5 mm and the thickness is about 2 mm.

[0070] figure 1 Reflects the difference in...

Embodiment 2

[0073] Preparation of Sc 1.9 Eu 0.1 o 3 Blinking ceramic, x is 0 and y is 0.05.

[0074] Sc with a commercially available purity of 4N 2 o 3 、Eu 2 o 3 Nano as raw material. Accurately weigh a certain mass of Sc according to the above element ratio 2 o 3 and Eu 2 o 3 Raw material, using absolute ethanol as the ball milling medium. According to the mass ratio of ball mill: powder: anhydrous ethanol = 18:9:5, put it into a ball mill pot, and ball mill it on a high-speed planetary ball mill for 10 hours. The slurry obtained after ball milling was air-dried and placed in a thermostat at 50°C for 3 hours. The powder obtained by drying is passed through a 200-mesh sieve, put into a furnace, calcined at a low temperature of 1200°C, ball milled, dried, granulated, and sieved, and the obtained powder is molded under 200 MPa isostatic pressure. Put the sample into the atmosphere sintering furnace, the weak reducing atmosphere is 5% H 2 +95% Ar, sintered at 1600-1700°C for 4...

Embodiment 3

[0076] Preparation of Sc 1.84 Eu 0.16 o 3 Blinking film, x = 0, y = 0.08.

[0077] Accurately weigh Sc according to the above element ratio 2 o 3 and Eu 2 o 3 The raw materials are fully mixed, then molded under isostatic pressure of 200 MPa after mixing evenly, and sintered at a temperature of 1700° C. for 10 hours to make a polycrystalline ingot. Put the ingot into the vacuum chamber, and heat the substrate to 800°C with a vacuum of 10 -3 Pa, with Deposit at a speed of 1 / sec, and stop evaporation after the thickness of the film on the substrate reaches 200 μm; then perform annealing treatment at 600°C for 30 minutes, then cool down to room temperature, and take out the substrate after maintaining the original pressure for 3 hours . The grown film sample is colorless and transparent, and is firmly bonded to the substrate.

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Abstract

The present invention provides an europium-doped scandium oxide scintillator, which has a general formula (Sc1-x-yMxEuy)2O3, wherein M is one or a variety of materials selected from Lu, Y or Gd, x ismore than or equal to 0 and is less than or equal to 0.4, and y is more than 0 and is less than or equal to 0.2. The present invention provides the europium-doped rare earth sesquioxide scintillationmaterial with characteristics of low afterglow and high scintillation efficiency so as to substantially promote the wide application of the materials in the high-resolution dynamic X imaging field.

Description

technical field [0001] The invention relates to a scintillator material, in particular to a low afterglow scintillator material suitable for dynamic X-ray imaging. Background technique [0002] A scintillator is a material that absorbs high-energy rays such as X-rays or particles such as alpha particles or gamma photons and converts them into a large number of low-energy photons (ultraviolet or visible). Based on this characteristic, scintillators are widely used in fields such as security inspection, nuclear detection, and nuclear medical imaging. [0003] Scintillators such as europium-doped rare earth sesquioxides are a class of scintillators with excellent performance. Lu 2 o 3 Take :Eu as an example, its light output is 10 times that of BGO, and the appropriate emission wavelength (611nm) can be effectively coupled with CCD, thereby effectively improving the detection efficiency of the X-ray detection system, making this type of material in nuclear medicine imaging an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C04B35/622C30B29/22C30B13/00C09K11/78
CPCC09K11/7783C30B13/00C30B29/225C04B35/50C04B35/622C04B2235/9646
Inventor 冯鹤庄吕超张志军赵景泰
Owner SHANGHAI UNIV
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