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A method for improving scintillation performance of cerium-doped yttrium-lutetium silicate crystal grown by crucible drop method

A technology of crucible drop method and yttrium lutetium silicate, which is applied in the field of improving the scintillation performance of cerium-doped yttrium lutetium silicate crystal grown by crucible drop method, can solve the problems of crystal oxygen deficiency, inability to use, poor light output scintillation performance, etc., to achieve Effects that increase light output, reduce color center absorption, and optimize flicker performance

Active Publication Date: 2018-10-26
成都东骏激光股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the crystal is grown in a reducing atmosphere, there is a serious lack of oxygen in the crystal, and the scintillation performance such as light output and energy resolution is very poor, and it is almost unusable.

Method used

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  • A method for improving scintillation performance of cerium-doped yttrium-lutetium silicate crystal grown by crucible drop method
  • A method for improving scintillation performance of cerium-doped yttrium-lutetium silicate crystal grown by crucible drop method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Put the cerium-doped yttrium-lutetium silicate crystal into a high-temperature atmosphere furnace, first evacuate it to below 10KPa, and then slowly fill it with high-purity nitrogen;

[0022] (2) Heating stage: the crystal sample is heated from room temperature at a rate of 80 °C / h to 400 °C, then at a rate of 100 °C / h to 800 °C, and then at a rate of 60 °C / h to 1250 °C;

[0023] (3) Constant temperature stage: the crystal is kept at the highest temperature for 80 hours, and the color changes from beige to colorless and transparent;

[0024] (4) Cooling stage: After the constant temperature process is over, slowly drop to 900°C at a rate of -60°C / h, then drop to 600°C at a rate of -80°C / h, and finally drop to -100°C / h to room temperature.

[0025] The comparison test before and after shows that the number of channels is 159 before the crystal is processed, and the number of channels increases to 578 after high-temperature heat treatment, and the scintillation perf...

Embodiment 2

[0027] (1) Put the cerium-doped yttrium-lutetium silicate crystal into a high-temperature atmosphere furnace, first evacuate to below 10KPa, and then slowly fill in nitrogen and oxygen respectively, wherein the volume percentage of oxygen is 10%;

[0028] (2) Heating stage: the crystal sample is heated from room temperature at a rate of 80 °C / h to 400 °C, then at a rate of 100 °C / h to 800 °C, and then at a rate of 60 °C / h to 1200 °C;

[0029] (3) Constant temperature stage: the crystal is kept at the highest temperature for 100 hours, and the color changes from slightly yellow to colorless and transparent;

[0030] (4) Cooling stage: After the constant temperature process is over, slowly drop to 900°C at a rate of -60°C / h, then drop to 600°C at a rate of -80°C / h, and finally drop to -100°C / h to room temperature.

[0031] The comparison test before and after shows that the number of channels is 163 before the crystal is processed, but it is increased to 594 after high-temperat...

Embodiment 3

[0033] (1) Put the cerium-doped yttrium-lutetium silicate crystal into a high-temperature atmosphere furnace, first evacuate to below 10KPa, and then slowly fill in nitrogen and oxygen respectively, wherein the volume percentage of oxygen is 25%;

[0034] (2) Heating stage: the crystal sample is heated from room temperature at a rate of 80 °C / h to 400 °C, then at a rate of 100 °C / h to 800 °C, and then at a rate of 60 °C / h to 1300 °C;

[0035] (3) Constant temperature stage: the crystal is kept at the highest temperature for 60 hours, and the color changes from light brown to colorless and transparent;

[0036] (4) Cooling stage: After the constant temperature process is over, slowly drop to 900°C at a rate of -60°C / h, then drop to 600°C at a rate of -80°C / h, and finally drop to -100°C / h to room temperature.

[0037] The comparison test before and after shows that the number of channels is 157 before the crystal is processed, and the number of channels increases to 622 after h...

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Abstract

The invention discloses a method for improving the scintillation property of cerium-doped LYSO crystals grown through a Bridgman-Stockbarger method. The crystals are subjected to high-temperature thermal treatment under a neutral or oxidizing atmosphere condition, so that the crystals are transformed into colorless and transparent from a sandy color or other colors, and meanwhile the scintillation property the crystals is obviously improved. It is shown through testing results that the transmittance of the crystals at 420 nm is 83.5%, the optimal light output is 36,000+ / -1,000 photons / MeV, and the fall time is 42.9 ns. The comprehensive performance of the crystals reaches the advanced level at home and abroad.

Description

technical field [0001] The invention relates to the field of crystal materials, in particular to a method for improving the scintillation performance of cerium-doped yttrium-lutetium silicate crystal grown by a crucible descent method. Background technique [0002] Cerium-doped yttrium-lutetium silicate crystal (LYSO:Ce) is a new type of scintillation crystal with excellent comprehensive performance. Its main features include: high light yield, which can reach 75% of NaI(Tl) crystal; short fluorescence decay time, about 40ns; The fluorescence emission peak is within the detection sensitivity range of the photomultiplier tube, and has good detection efficiency for γ-rays; high energy resolution; stable chemical properties, no deliquescence, good mechanical strength, etc. Based on the above characteristics, LYSO:Ce crystal has broad application prospects in high-energy physics, nuclear medicine, industrial CT, safety inspection and other fields, and has been gradually applied ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B33/02C30B29/22
Inventor 周世斌王桂素沈定中
Owner 成都东骏激光股份有限公司
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