Method for growing scintillation crystal seed crystal in multiple crucibles

A scintillator and multi-crucible technology is applied in the field of preparation of scintillation crystal material seed crystals, which can solve the problems of complex scintillator seed crystal process and waste of raw materials, and achieves the effects of excellent seed crystal quality, reduced production cost, and simplified orientation process.

Inactive Publication Date: 2020-06-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem solved by the present invention is: in order to solve the problems such as complex process and waste of raw materials for preparing scintillator seed crystals in the existing method, the present invention provides a method for growing scintillator seed crystals with multiple crucibles

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  • Method for growing scintillation crystal seed crystal in multiple crucibles
  • Method for growing scintillation crystal seed crystal in multiple crucibles

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Embodiment 1

[0030] In the first step, under the argon atmosphere in the glove box, put the 4N pure NaI raw material into a clean and dry special quartz crucible. The inner diameter of the crucible is 5mm, and the quantity is 15 pieces. Vacuum the quartz crucible to a vacuum of 7×10 -5 Seal the tube at Pa.

[0031] The second step is to place the above-mentioned quartz crucibles together in a high-temperature mixing furnace, preferably rapidly raise the temperature to 700°C at a rate of 70°C per hour, then perform rocking and oscillating mixing for 12 hours, turn off the furnace to cool down, and the mixing is completed.

[0032]The third step is to transfer the above-mentioned quartz crucible to the support together, and then place the support in the Bridgman crystal growth furnace. The zone temperature was 560°C and the heating time was 9 hours. After reaching the target temperature, superheat at 30°C above the melting point of sodium iodide for 24 hours. Preferably, the temperature ...

Embodiment 2

[0036] In the first step, under the argon atmosphere in the glove box, put the raw material of lanthanum bromide with a purity of 5N into a clean and dry special quartz crucible. The inner diameter of the crucible is 7mm, and the quantity is 9 pieces. Vacuum the quartz crucible with a vacuum degree of 8×10 -5 Seal the tube at Pa.

[0037] The second step is to place the above-mentioned quartz crucibles together in a high-temperature mixing furnace, preferably rapidly raising the temperature to 810°C at a rate of 100°C per hour, then rocking and oscillating the mixing for 24 hours, turning off the furnace to cool down, and the mixing is completed.

[0038] The third step is to transfer the above-mentioned quartz crucible to the support together, and then place the support in the Bridgman crystal growth furnace. The zone temperature was 700°C and the heating time was 10 hours. After reaching the target temperature, superheat at 50°C above the melting point of lanthanum bromid...

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Abstract

The invention discloses a method for growing a scintillation crystal seed crystal in multiple crucibles. According to the method, raw materials are put into a plurality of specially-made quartz crucibles according to a certain proportion, the crucibles are vacuumized and sealed, the inner diameters of the crucibles are consistent with the size of a required seed crystal, a scintillator crystal cangrow through spontaneous nucleation, the crucibles are put into crystal growth equipment for growth by using a specially-made supporting structure, and finally, a crystal is taken out and cut and polished along the radial direction to obtain the required crystal seed crystal. As the diameter of the grown crystal is the same as that of the required seed crystal, the crystal can be used as the seedcrystal only by cutting the crystal to the required length along the radial direction and simply processing the cutting surface, the process is simple, and the raw material utilization rate is high.The yield of the scintillation crystal seed crystal produced by the method is as high as 80-95%; the seed crystal is excellent in quality, transparent, smooth and clean, free of obvious wrappage and high in energy resolution; and the seed crystal production efficiency is effectively improved and the production cost is reduced through co-growth of multiple crucibles.

Description

technical field [0001] The invention belongs to the field of scintillator materials, in particular to a method for preparing scintillator crystal seed crystals. Background technique [0002] Since the discovery of X-rays, high-energy ray and particle detection technologies, including gas ionization detectors, semiconductor detectors, scintillation detectors, track detectors, etc., have had a profound impact on the development of human society. Among them, the most widely used material is the inorganic scintillation crystal. Due to the excitation of high-energy rays or radioactive particles, the object that emits a fluorescent pulse (scintillation light) is called a scintillator. Since inorganic scintillation crystals have a wide range of types, they can effectively test the characteristics of different types of high-energy rays and particles. There are a wide range of applications. With the rapid development of nuclear science and technology and other related technologies,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B11/14C30B29/12
CPCC30B11/14C30B29/12
Inventor 张香港殷子昂杨帆王涛
Owner NORTHWESTERN POLYTECHNICAL UNIV
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