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Cerium vanadate crystal material of scintillating crystal

A technology of scintillation crystals and crystal materials, applied in the growth of polycrystalline materials, crystal growth, single crystal growth, etc.

Inactive Publication Date: 2009-06-17
FUJIAN CASTECH CRYSTALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no relevant reports on cerium-doped vanadate crystals as scintillation crystals at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Embodiment one: liquid phase raw material synthesis method synthetic raw material

[0009] Assuming the synthesis of Ce doped with a concentration of 2% Ce 0.02 : Re 0.98 VO 4 Crystal raw material, that is, select x=0.02, according to the reaction formula:

[0010] 0.02Ce(NO 3 ) 3 +0.98Y(NO 3 ) 3 +NH 4 VO 3 = Ce 0.02 :Y 0.9 8VO 4

[0011] According to the molar ratio of 0.02:0.98:1, respectively weigh Ce with a purity of 99.99% 2 o 3 , Y 2 o 3 and NH 4 VO 3 Raw materials 6.6 grams, 221.3 grams, 116.9 grams. Then Ce 2 o 3 , Y 2 o 3 Dissolve in dilute acid solution together, and dissolve ammonium metavanadate in dilute ammonia solution. Slowly add both solutions simultaneously to a large plastic bucket. Stir continuously during this process to make the solution mix evenly and complete the reaction; at the same time, according to the pH value of the mixed solution, add an appropriate amount of dilute ammonia or dilute acid solution to ensure that th...

Embodiment 2

[0012] Embodiment two: crystal growth

[0013] Adopt domestic DJL-400 type lead-up method single crystal growth furnace, 25KW thyristor intermediate frequency induction power supply heating, double platinum rhodium (Pt / Rh30-Pt / Rh10) thermocouple, British Continental 818 temperature regulator, temperature control accuracy up to ±0.1 ℃.

[0014] Typical crystal growth parameters are:

[0015] Table 1 Technical parameters of vanadate crystal growth by pulling method

[0016] seed orientation or axial

Growth atmosphere and pressure N 2 +0.5~2% O 2 , 50KPa pull rate 1.5~2.5mm / h Rotation rate 5~10rpm Annealing rate

15~25K / h(>1200)℃,

30~50K / h(<1200℃)

Segregation Coefficient of Ce in Crystal 0.6～0.8

[0017] Step 1 Preparations before crystal growth

[0018] Including furnace cleaning, chemicals, seed alignment and filling the furnace with a protective atmosphere.

[0019] Step 2 Seeding, Neck Neck and Shoulder Release...

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PUM

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Abstract

A new type of crystalline material produced by mixing scintillation crystal into cerium vanadates crystal.Its molecular formula is Cex:Ln(1-x)VO4 in which the letter Ln represents any of the four elements, Lu, Y, Gd, La while the letter x means mol ratio of Ln replaced by Ce which variates in the range of 0.001-1. This material can be used as part of scintillation probe and be used in many fields such as high-energy physics, geologic survey and so on.

Description

technical field [0001] The invention relates to a novel scintillation crystal-doped cerium vanadate crystal, and relates to the raw material synthesis and crystal growth process of this series of crystals. technical background [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 (XCT, PET), geological exploration, astronomy and space physics, 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 scintillation crystals such as NaI(Tl) and BGO cannot meet the special requirements of new application fields. [0003] People are exploring new and excellent scintillation crystals suitable for different application fields. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/30C30B15/00
Inventor 吴少凡
Owner FUJIAN CASTECH CRYSTALS