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Multi-ion doped large-size LaBr monocrystal scintillator and preparation method thereof

A single crystal scintillator and lanthanum bromide technology is applied in the field of multi-ion doped large-size lanthanum bromide single crystal scintillator and its preparation, and can solve the problems of multiple cracks and envelopes, low crystal yield and poor crystal quality and other problems, to achieve the effect of reducing crystal growth stress, improving crystal yield, and improving crystal scintillation effect

Active Publication Date: 2015-12-16
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when growing crystals with a size above Φ38*38mm, the crystal yield (yield rate = number of crystals with good appearance / total number of crystals) is low when simply doping a cation, as shown in Table 1 (LaBr doped with cations) 3 The crystal quality, yield and energy resolution of the crystal) show: doping a kind of cation alone, the crystal quality is not good, there are many cracks and envelopes, doping with Sr 2+ and Ca 2+ 、Sr 2+ and Mg 2+ , Ca 2+ and Zr 4+ or Ca 2+ and Hf 4+ , the quality of the grown crystal also has more cracks and envelopes

Method used

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  • Multi-ion doped large-size LaBr monocrystal scintillator and preparation method thereof
  • Multi-ion doped large-size LaBr monocrystal scintillator and preparation method thereof
  • Multi-ion doped large-size LaBr monocrystal scintillator and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0022] X = 0.005, Y = 0.001,

[0023] The raw material of cerium-doped lanthanum bromide crystal is a mixture of anhydrous lanthanum bromide and cerium bromide. Among them, 992.96 grams of lanthanum bromide, 5.04 grams of cerium bromide, 0.64 grams of strontium bromide and 1.32 grams of hafnium bromide, each with a purity of 99%. Mix evenly in a glove box filled with high-purity nitrogen and put it into a quartz crucible, then block the mouth of the quartz crucible with a quartz block, and then seal the mouth of the quartz crucible with epoxy resin, and take out the quartz crucible with the raw materials. Box, using oxyhydrogen flame to melt and seal the nozzle of the quartz crucible. Put the encapsulated quartz tube into the lowering furnace, and lower it to the position where the quartz crucible head is located at the interface between the upper temperature zone and the lower temperature zone, and then increase the furnace temperature in the upper temperature zone to 800°C at ...

Embodiment 2

[0026] X = 0.005 Y = 0.005

[0027] The raw material of cerium-doped lanthanum bromide crystal is a mixture of commercially available anhydrous lanthanum bromide and cerium bromide. Among them, 985 grams of lanthanum bromide, 5.04 grams of cerium bromide, 3.28 grams of strontium bromide and 6.64 grams of hafnium bromide, all with 99% raw material purity. Mix evenly in a glove box filled with high-purity nitrogen, then put it into a quartz tube, then block the mouth of the quartz tube with a quartz block, then seal the mouth of the tube with epoxy resin, take out the glove box, and use a hydrogen-oxygen flame to remove the quartz crucible The nozzle is melted and sealed. Put the encapsulated quartz tube into the lowering furnace and lower it to the position where the quartz crucible head is located at the interface between the upper temperature zone and the lower temperature zone, and then raise the furnace temperature in the upper temperature zone to 800°C at a rate of 100°C / h. ...

Embodiment 3

[0029] X = 0.005 Y = 0.01

[0030] The raw material of cerium-doped lanthanum bromide crystal is a mixture of commercially available anhydrous lanthanum bromide and cerium bromide. Among them, 975.08 grams of lanthanum bromide, 5.04 grams of cerium bromide, 6.6 grams of strontium bromide with 99% raw material purity, and 13.28 grams of hafnium bromide. Mix evenly in a glove box filled with high-purity nitrogen, then put it into a quartz tube, then block the mouth of the quartz tube with a quartz block, then seal the mouth of the tube with epoxy resin, take out the glove box, and use a hydrogen-oxygen flame to remove the quartz crucible The nozzle is melted and sealed. Put the encapsulated quartz tube into the lowering furnace and lower it to the position where the quartz crucible head is located at the interface between the upper temperature zone and the lower temperature zone, and then raise the furnace temperature in the upper temperature zone to 800°C at a rate of 100°C / h. T...

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Abstract

The invention relates to the field of scintillation crystal materials and discloses a multi-ion doped large-size LaBr monocrystal scintillator. The multi-ion doped large-size LaBr monocrystal scintillator is characterized in that a general chemical formula of the monocrystal scintillator is (CexSryHfy)La(1-x-2y)Br3, wherein x is larger than 0.001 and smaller than 0.12, and y is larger than 0.0001 and smaller than 0.05. The multi-ion doped large-size LaBr monocrystal scintillator has the benefits as follows: with the adoption of the method for growth of a large-size LaBr crystal, a seed crystal elimination direction can be optimized, the defects of cracking, enveloping and the like during crystal growth can be effectively overcome, the crystal growth stress is reduced, the finished product ratio of the crystal is increased, the optical property of the crystal can be improved, and the scintillation effect of the crystal is improved.

Description

Technical field [0001] The invention relates to the field of scintillation crystal materials, in particular to a multi-ion doped large-size lanthanum bromide single crystal scintillator and a preparation method thereof. Background technique [0002] Scintillation crystals can be made into detectors and have huge application prospects in the fields of high-energy physics, nuclear physics, imaging nuclear medicine diagnosis, geological prospecting, astronomical space physics, and security inspection. With the rapid development of nuclear science and technology and other related technologies, its application fields are constantly expanding. Different application fields also put forward more and higher requirements on inorganic scintillators. The traditional NaI:TI, BGO and other scintillation crystals can no longer meet the special requirements of new application fields. [0003] People are exploring new and excellent scintillation crystals suitable for different application fields....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C30B11/00
Inventor 方声浩叶宁苏伟平吴少凡洪茂椿郑发鲲
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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