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Rapid preparation method of Ce:Cs2LiYCl6 crystal for gamma-ray and neutron dual detection

A technology of crystal and seed crystal, which is applied in the field of optoelectronic materials, can solve the problems of crystal security, wall adhesion, slow crystal growth speed, and difficult device processing, etc., and achieve the effects of avoiding thermal stress, saving time, and shortening the growth cycle

Inactive Publication Date: 2018-03-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems are: 1. The crystal growth rate is slow, generally 0.4-0.8mm / h, and the growth cycle is long
2. The crystal is easy to adhere to the wall of the anvil, and the thermal stress caused by the difference in thermal conductivity and shrinkage of the crystal and the anvil produces twins
Because the crystal is easy to deliquescence, subsequent device processing is difficult

Method used

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  • Rapid preparation method of Ce:Cs2LiYCl6 crystal for gamma-ray and neutron dual detection
  • Rapid preparation method of Ce:Cs2LiYCl6 crystal for gamma-ray and neutron dual detection
  • Rapid preparation method of Ce:Cs2LiYCl6 crystal for gamma-ray and neutron dual detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) CsCl, LiCl and (YCl) with a purity of more than 99.9% 3+ CeCl 3 ) The raw materials are mixed evenly at a molar ratio of 2:1:1; put into a closed quartz crucible and heat up to 750°C, keep the temperature for 4 hours, the material is fully melted and the melt is mixed evenly; then it is cooled to room temperature at a rate of 50°C / hour, Ce:CLYC crystals are obtained by spontaneous nucleation, and the defect-free Ce:CLYC crystal parts are selected as seed crystals;

[0044] (2) Get raw materials CsCl, LiCl and (YCl) with a purity of more than 99.9% 3+ CeCl 3 ), mixed evenly at a molar ratio of 2:1:1 and put into a quartz crucible 1, placing a quartz mold 2 with a circular diameter of 12 mm on the edge and a meniscus-shaped longitudinal section on the raw material in the quartz crucible, and sealing them together in a In the quartz safety tube 3, the air is vacuumed out, and argon gas is filled from the air inlet 6, so that the air pressure in the safety tube is 0....

Embodiment 2

[0048] (1) The growth of seed crystal is as embodiment 1 step (1);

[0049] (2) As described in Example 1, the difference is that the mold used is a graphite mold with a square edge, and the edge size of the square mold is 4 millimeters.

[0050] Fill with argon to make the air pressure in the safety tube 0.01-0.02Pa; raise the temperature to 800°C to overheat the chemical material. Overheat at constant temperature for 3 hours to fully melt and mix the materials evenly. Connect the two capillary channels below in the center of the square graphite mold to transport the molten raw material liquid to the upper surface of the graphite mold and form a melt film on the upper surface; then fix the seed crystal in step (1) to the seed crystal rod Put it on the graphite mold and fully preheat it, then lower it to the melt film that touches the upper surface of the mold, then lower the temperature to 0.5°C above the melting point, with a pulling rate of 7mm / min, and a cooling rate of 2...

Embodiment 3

[0053] (1) The growth of seed crystal is as embodiment 1 step (1);

[0054] (2) Take the raw material CeCl with a purity of more than 99.9% 3 , LiCl and (CsCl+YCl 3 ), mixed evenly at a molar ratio of 2:1:1 and placed in a quartz crucible, and an aluminum nitride mold with a rectangular edge of 15 mm × 2 mm was placed in the quartz crucible. Raw material CeCl 3 , CsCl, LiCl and YCl 3 The above are hermetically sealed in a quartz safety tube, the air is evacuated, and the air is filled with argon so that the pressure in the safety tube is 0.03-0.04Pa; the temperature is raised to 800°C and the chemical material is overheated. Overheat at constant temperature for 3 hours to fully melt and mix the materials evenly. The aluminum nitride mold is evenly distributed with 3 through holes, and there are 3 capillary channels below to transport the molten raw material liquid to the upper surface of the mold and form a melt film on the upper surface; then the seed crystal of step (1) ...

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Abstract

The invention relates to a rapid preparation method of a Ce:Cs2LiYCl6 crystal for gamma-ray and neutron dual detection. The rapid preparation method comprises the following steps of: taking CeCl3, CsCl, LiCl and YCl3 as raw materials, placing a mold on the raw materials, carrying out vacuumizing, introducing argon, and carrying out heating and melting to overheat, wherein at least one capillary channel is arranged below the mold for conveying molten raw material liquid to the upper surface of the mold and forming a solution film on the upper surface; and then putting down a seed crystal, and carrying out pulling growth of the crystal at a rate of 3-8mm / min, wherein the growth period of the crystal is 10-15 hours. The preparation method provided by the invention realizes the rapid growth ofcentimeter-level bulk crystals, and the prepared Ce:Cs2LiYCl6 crystal can be used as a gamma-ray and neutron detection materials and used in the fields of nuclear detection, homeland security and thelike.

Description

technical field [0001] The invention relates to a Ce:Cs double detection material for gamma rays and neutrons 2 LiYCl 6 The invention relates to a rapid preparation method of crystals, which belongs to the technical field of photoelectric materials. Background technique [0002] Inorganic scintillation crystals are a type of energy conversion body that can convert incident high-energy rays (particles) into ultraviolet or visible light. Ce:Cs 2 LiYCl 6 (Ce:CLYC) has good dual detection capability of γ-ray and neutron. For example, the CLYC scintillation crystal detector used in the gamma and neutron dual-ray energy spectrum measurement device proposed by CN106990429A. Ce:CLYC crystals have high energy resolution (3.6%), fast decay (~1ns) and good energy response linearity of γ-rays for γ-ray detection. The crystal has a high light yield (73,000photons / neutron) for thermal neutron detection and a high alpha / beta ratio (~0.73). As the core material of photodetectors, Ce:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B15/34C30B29/12
CPCC30B15/34C30B29/12
Inventor 李静柳林涛姚倩董为民张俊英
Owner SHANDONG UNIV
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