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
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  • 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 i

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

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

[0027] In a neutral atmosphere, the chemical reaction equation in this example is:

[0028]

[0029]

[0030] Here X = 0.1%

[0031] So will 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 uniformly, use a press machine at 40kg / cm 2 It is pressed into a cake under a pressure of 1500C and then sintered in a neutral nitrogen atmosphere at 1600°C for 20 hours, installed in a furnace, evacuated, filled with high-purity nitrogen, and heated to melt for growth. The pulling speed is 3mm / h, and the rotation speed is 20rpm. After the crystal grows, it is slowly reduced to room temperature, and the crystal is taken out.

[0032] The crystal is colorless, transparent and complete, with good quality. Test its light output flicker performanc...

Example Embodiment

[0033] Example 2. Using Ce(OH) 3 As a dopant raw material, yttrium orthosilicate scintillation crystals are grown.

[0034] In a neutral atmosphere, the chemical reaction equation in this example is:

[0035]

[0036]

[0037] Here X=3.0%

[0038] So will 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 uniformly, use a press machine at 20kg / cm 2 It is pressed into a cake under the pressure of 1500C and then sintered in a neutral nitrogen atmosphere at 1000°C for 10 hours. The furnace is filled with high-purity nitrogen and heated to melt for growth. The pulling speed is 1mm / h, and the rotation speed is 10rpm. After growing the crystal, slowly lower to room temperature and take out the crystal.

[0039] The crystal is colorless, transparent and complete, with good quality. Test its light output flicker performance and found that it is better than CeO 2 ...

Example Embodiment

[0040] Example 3. Using Ce 2 (C 2 O 4 ) 3 As a dopant raw material, yttrium orthosilicate scintillation crystals are grown.

[0041] In a neutral atmosphere, the chemical reaction equation in this example is:

[0042]

[0043]

[0044] Here X = 1.0%

[0045] So will 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 uniformly, use a press machine at 30kg / cm 2 It is pressed into a cake under a pressure of 1500C and then sintered in a neutral nitrogen atmosphere at 1400°C for 15 hours. The furnace is filled with high-purity nitrogen and heated to melt for growth. The pulling speed is 2mm / h, and the rotation speed is 15rpm. After growing the crystal, slowly lower to room temperature and take out the crystal.

[0046] The crystal is colorless, transparent and complete, with good quality. Test its light output flicker performance and found that it is ...

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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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