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Method for preparing scintillating crystal of orthosilicate with bivalent cerium ions doped

A scintillation crystal, orthosilicate technology, applied in crystal growth, chemical instruments and methods, single crystal growth and other directions, can solve the problem of reducing the scintillation performance of silicate crystals, and achieve the goal of improving the scintillation performance and reducing the quenching effect. Effect

Inactive Publication Date: 2005-01-12
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: since the doping of Ce is through CeO 2 introduced, and Ce 4+ The radius of Ce 3+ Compared with the radius of Y, and Y 3+ , Gd 3+ , Lu 3+ The radius of the element is closer, and the fourth-order ionization energy of Ce element is the lowest among the lanthanide rare earth elements, so the grown crystal must contain a large amount of Ce 4+ ion, for Ce 3+ The luminescence of the silicate crystals produces a severe quenching effect, which reduces the scintillation performance of silicate crystals

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1. With Ce 2 (CO 3 ) 3 As a dopant raw material, yttrium silicate scintillation crystals were grown.

[0027] Under neutral atmosphere conditions, the chemical reaction equation in this example is:

[0028]

[0029]

[0030] Here X=0.1%

[0031] So put Y 2 o 3 , SiO 2 , Ce 2 (CO 3 ) 3 The high-purity raw materials are weighed according to the molar ratio of 1.999:2:0.001, and the total weight is 1Kg. After mechanically mixing evenly, use a press machine at 40kg / cm 2 It is pressed into a cake under a certain pressure and then sintered at 1600°C for 20 hours in a neutral nitrogen atmosphere. The furnace is installed, vacuumed, filled with high-purity nitrogen, and heated and melted to prepare for growth. The pulling speed was 3 mm / h, and the rotation speed was 20 rpm. After the crystal grows, it is slowly lowered to room temperature, and the crystal is taken out.

[0032] The crystal is colorless, transparent, complete and of good qualit...

Embodiment 2

[0033] Embodiment 2. With Ce(OH) 3 As a dopant raw material, yttrium orthosilicate scintillation crystals were grown.

[0034] Under neutral atmosphere conditions, the chemical reaction equation in this example is:

[0035]

[0036]

[0037] Here X=3.0%

[0038] So put Y 2 o 3 , SiO 2 , Ce(OH) 3 The high-purity raw materials are weighed according to the molar ratio of 1.97:2:0.06, and the total weight is 1Kg. After mechanically mixing evenly, use a press machine at 20kg / cm 2 It is pressed into a cake under a certain pressure and then sintered at 1000°C for 10 hours in a neutral nitrogen atmosphere. The furnace is vacuumed and filled with high-purity nitrogen, and the temperature is raised to melt and prepare for growth. The pulling speed was 1 mm / h, and the rotation speed was 10 rpm. After growing the crystal, it was slowly lowered to room temperature, and the crystal was taken out.

[0039] The crystal is colorless, transparent, complete and of good qua...

Embodiment 3

[0040] Example 3. With Ce 2 (C 2 o 4 ) 3 As a dopant raw material, yttrium orthosilicate scintillation crystals were grown.

[0041] Under neutral atmosphere conditions, the chemical reaction equation in this example is:

[0042]

[0043]

[0044] Here X=1.0%

[0045] So put Y 2 o 3 , SiO 2 , Ce 2 (C 2 o 4 ) 3 The high-purity raw materials are weighed according to the molar ratio of 1.99:2:0.01, and the total weight is 1Kg. After mechanically mixing evenly, use a press machine at 30kg / cm 2 It is pressed into cakes under a certain pressure and then sintered at 1400°C for 15 hours in a neutral nitrogen atmosphere. The furnace is vacuumed and filled with high-purity nitrogen, and the temperature is raised to melt and prepare for growth. The pulling speed was 2 mm / h, and the rotation speed was 15 rpm. After growing the crystal, it was slowly lowered to room temperature, and the crystal was taken out.

[0046] The crystal is colorless, transparent, comp...

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PUM

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Abstract

The key of a preparation method for metasilicate scintillation crystals doped with 3-valence Ce ions is that its growing formula is doped with 3-valence Ce compounds which can be any one of the followings : Ce(OH)3, Ce2 ( C2 O4)3, Ce (CH3 Co6)3 and Ce2 (CO3)3. The raw material is sintered and grown in the neutral atmosphere and the crystals can reduce the quenching to Ce3+ illumination and increase its scintillation performance for about 5%-10%.

Description

Technical field: [0001] The invention relates to scintillation crystals, in particular to a method for preparing orthosilicate scintillation crystals doped with trivalent cerium ions, namely cerium-doped yttrium silicate, lutetium silicate, gadolinium silicate, yttrium lutetium silicate, and yttrium silicate Preparation method of gadolinium, lutetium-gadolinium silicate scintillation crystal. Background technique: [0002] Orthosilicate single crystals doped with cerium ions are a class of high-temperature inorganic scintillation materials with excellent performance. They are widely used in imaging nuclear medicine (PET) diagnosis, industrial online non-destructive testing, oil well survey, safety inspection and high-energy particle detection. application background. [0003] Yttrium silicate (Y 2 SiO 5 ) single crystal is a widely used multifunctional material, cerium-doped yttrium silicate single crystal has high luminous efficiency and decay rate, has been applied to p...

Claims

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Application Information

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IPC IPC(8): C30B15/04C30B29/34
Inventor 曾雄辉夏长泰徐军赵广军何晓明张连翰介明印庞辉勇李抒智
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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