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Multi-ion doped large-size lanthanum bromide single crystal scintillator and preparation method thereof

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

Active Publication Date: 2017-10-24
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 lanthanum bromide single crystal scintillator and preparation method thereof
  • Multi-ion doped large-size lanthanum bromide single crystal scintillator and preparation method thereof
  • Multi-ion doped large-size lanthanum bromide single crystal 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 cerium-doped lanthanum bromide crystal raw material 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 with a raw material purity of 99% are added. Mix evenly in a glove box filled with high-purity nitrogen and put it into a quartz crucible, then block the nozzle of the quartz crucible with a quartz block, then seal the nozzle of the quartz crucible with epoxy resin, and take out the quartz crucible with raw materials Box, using a hydrogen-oxygen flame to melt and seal the nozzle of the quartz crucible. Put the packaged quartz tube into the descending furnace, and lower the quartz crucible head to the interface position between the upper temperature zone and the lower temperature zone, then raise the furnace temperature in the upper temperature zone to 800°C at 50°C / h, and lower the tem...

Embodiment 2

[0026] X=0.005Y=0.005

[0027] The cerium-doped lanthanum bromide crystal raw material 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 with raw material purity of 99% are added. After mixing evenly in a glove box filled with high-purity nitrogen, put it into a quartz tube, then block the quartz tube opening with a quartz block, then seal the tube opening with epoxy resin, take out the glove box, and use a hydrogen-oxygen flame to burn the quartz crucible. The orifice melts and seals. Put the packaged quartz tube into the descending furnace, and lower it to the position where the head of the quartz crucible is located at the interface between the upper temperature zone and the lower temperature zone, then raise the furnace temperature in the upper temperature zone to 800°C at 100°C / h, and lower the te...

Embodiment 3

[0029] X=0.005Y=0.01

[0030] The cerium-doped lanthanum bromide crystal raw material 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 and 13.28 grams of hafnium bromide with a raw material purity of 99% are added. After mixing evenly in a glove box filled with high-purity nitrogen, put it into a quartz tube, then block the quartz tube opening with a quartz block, then seal the tube opening with epoxy resin, take out the glove box, and use a hydrogen-oxygen flame to burn the quartz crucible. The orifice melts and seals. Put the packaged quartz tube into the descending furnace, and lower it to the position where the head of the quartz crucible is located at the interface between the upper temperature zone and the lower temperature zone, then raise the furnace temperature in the upper temperature zone to 800°C at 100°C / h, and lower th...

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Abstract

The invention relates to the field of scintillation crystal materials, a multi-ion doped large-size lanthanum bromide single crystal scintillator, characterized in that: the general chemical formula of the single crystal scintillator is (CexSryHfy)La(1-x-2y )Br3, where 0.001

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 great application prospects in the fields of high-energy physics, nuclear physics, imaging nuclear medicine diagnosis, geological exploration, astrophysics, and safety 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 for inorganic scintillators. 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. These ne...

Claims

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Application Information

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Patent Type & Authority Patents(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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