Growth of rare earth scintillation crystals with low cost

A scintillation crystal and rare earth technology, which is applied in the growth field of low-cost rare earth scintillation crystals, can solve the problems of high cost, long growth cycle, high labor cost and high investment, and achieve the effect of low cost

Inactive Publication Date: 2017-05-31
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the growth process of rare-earth scintillation crystals, such as the growth of cerium-doped yttrium-lutetium silicate (Ce:LYSO) scintillation crystals, the main problems are: 1) the melting point of rare-earth silicate scintillation crystals is high (2050 ° C), which is relatively The high melting point will cause the medium/high frequency power supply to consume high power during the heating process; 2) The melting point of the rare earth silicate scintillation crystal is close to the melting point of the heating body Ir crucible (2450°C), and the Ir volatilization is serious, and the growth period is long Serious loss of precious metals
3) The seed crystal is easy to fuse. The seed crystal is easy to be blown during the seeding process, resulting in failure of crystal growth. The seed crystal is reinstalled after cooling down and opening the furnace, which seriously wastes electric energy and precious

Method used

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  • Growth of rare earth scintillation crystals with low cost
  • Growth of rare earth scintillation crystals with low cost
  • Growth of rare earth scintillation crystals with low cost

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] According to the above preparation process, the raw materials of rare earth scintillation crystals are first multi-stage cascade crystallized to obtain Lu with a purity higher than 99.995%. 2 o 3 , SiO 2 , CeO 2 Powder, according to Lu 2 o 3 :SiO2 2 :CeO 2 =1.08:1:0.02 Proportion weighing, fully mixed to obtain mixed raw materials (oxide raw materials).

[0158] Then design a three-stage settling tank in series, 1) put the oxide raw material into the first-stage settling tank, wash the oxide with deionized water and then settle; 3) Move the liquid in the secondary settling tank to the tertiary settling tank, then move the liquid in the primary settling tank to the secondary settling tank, and continue to inject it into the primary settling tank Deionized water was subjected to three sedimentation. Repeat the above process 4 times, and take out the cleaned oxide raw material from the bottom of the settling tank.

[0159] Then press it under 50MPa to make a raw m...

Embodiment 2

[0163] According to the above preparation process, the raw materials of rare earth scintillation crystals are first multi-stage cascade crystallized to obtain Lu with a purity higher than 99.995%. 2 o 3 , Y 2 o 3 , SiO 2 , CeO 2 Powder, according to Lu 2 o 3 :Y 2 o 3 :SiO2 2 :CeO 2 =0.83:0.16:1:0.01 Proportional weighing, fully mixed to obtain mixed raw materials (oxide raw materials).

[0164] Then design a three-stage settling tank in series, 1) put the oxide raw material into the first-stage settling tank, wash the oxide with deionized water and then settle; 3) Move the liquid in the secondary settling tank to the tertiary settling tank, then move the liquid in the primary settling tank to the secondary settling tank, and continue to inject it into the primary settling tank Deionized water was subjected to three sedimentation. Repeat the above process 3 times, and take out the cleaned oxide raw material from the bottom of the settling tank.

[0165]Then press i...

Embodiment 3

[0168] According to the above preparation process, the raw materials of rare earth scintillation crystals are first multi-stage cascade crystallized to obtain Lu with a purity higher than 99.995%. 2 o 3 , Y 2 o 3 , SiO 2 , CeO 2 Powder, according to Lu 2 o 3 :Y 2 o 3 :SiO2 2 :CeO 2 =0.83:0.16:1:0.01 Proportional weighing, fully mixed to obtain mixed raw materials (oxide raw materials). Then press it under 50MPa to make a raw material cake, put the raw material cake into a high-purity crucible and sinter at 1050°C under the protection of an inert atmosphere to form a polycrystalline material block. The dominant growth direction [001] was determined by using the chemical bonding theory of crystal growth, and the lutetium silicate single crystal with the crystal direction [001] was used as the seed crystal. Using the crystal growth theory to calculate the Ce:LYSO crystal with a diameter of 35 mm, the pulling growth rate along the [001] direction is 3.8-6.2 mm / h, and th...

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Abstract

The invention provides a calculating method of growing parameters in a rare earth scintillation crystal growing process and a growing process of rare earth scintillation crystals. The growing process comprises the following steps: firstly, mixing an oxide raw material for preparing the rare earth scintillation crystals to obtain a mixed raw material; then in a vacuum atmosphere or a protective atmosphere, sintering the mixed raw material obtained in the step to obtain a polycrystal material block; and finally, in the vacuum atmosphere or the protective atmosphere, after melting the polycrystal material block, performing crystal growth by means of a pulling method according to the growing parameters calculated by the calculating method guided by seeds with specific growing directions to obtain the rare earth scintillation crystals. From the aspect of a crystal growing theory, the growing parameters such as the fastest growth rate, pulling growth rate and crystal rotating rate thermodynamically permitted through special simulating, deducing and calculating methods are obtained. The growing process is low in energy consumption, little in noble metal loss, short in time of growing process and high in crystal rate of finished products and has an obvious low cost advantage.

Description

technical field [0001] The invention relates to the technical field of scintillation crystal materials, in particular to the growth of low-cost rare earth scintillation crystals. 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. Scintillation crystals are an important conversion medium that can convert high-energy rays / particles into fluorescent pulses in the near-ultraviolet / visible range. Therefore, they have excellent ionizing radiation detection functions and are currently widely used in high-energy physics, nuclear physics, nuclear medicine imaging, security Inspection, industrial exploration and other important fields....

Claims

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Application Information

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IPC IPC(8): C30B29/34C30B28/02C30B15/00C30B29/28
CPCC30B29/34C30B15/00C30B28/02C30B29/28
Inventor 薛冬峰孙丛婷
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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