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Single crystal scintillator material, method for producing same, radiation detector and PET system

一种放射线检测器、单晶闪烁体的技术，应用在单晶闪烁体材料及其制造领域，能够解决劣化、发光量减少、添加元素产生密度降低等问题

Inactive Publication Date: 2011-08-24
PROTERIAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single crystals of lutetium borates formed by the method described in Patent Document 4 have characteristics such as a decrease in density and a decrease in the amount of light emitted due to the addition of elements.

Method used

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  • Single crystal scintillator material, method for producing same, radiation detector and PET system
  • Single crystal scintillator material, method for producing same, radiation detector and PET system
  • Single crystal scintillator material, method for producing same, radiation detector and PET system

Examples

Experimental program
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Effect test

Embodiment 1

[0101] In this example, crystals were grown by the flux method (slow cooling method). Prepare a platinum crucible with a diameter of 50 mm and a depth of 60 mm, and weigh Na 2 CO 3 : 15.30g, Li 2 CO 3 : 5.80g, WO 3 : 33.50g, B 2 o 3 : 6.20g, Lu 2 o 3 : 4.20g, CeO 2 : 0.02g. After that, they were mixed in a mortar and filled in the above-mentioned crucible. Place the platinum crucible into an aluminum crucible with a diameter of 60 mm and a depth of 70 mm and cover it with a lid to image 3 The indicated heating curves cultivate crystallization. image 3 The vertical axis is temperature, and the horizontal axis is time. The description during the cooling process is omitted.

[0102] In this example, from image 3 It can be seen that firstly the temperature is raised to 800°C at 200°C / Hr, then the temperature is raised to 1000°C at 100°C / Hr, and then the temperature is raised to 1200°C at 50°C / Hr. After keeping at 1200°C for 8 hours, the temperature was lowered to...

Embodiment 2

[0110] In this example, use figure 2 In the shown apparatus, crystals are grown by the TSSG method. Prepare a platinum crucible 1 with a diameter of 50 mm and a depth of 50 mm, and weigh Na 2 CO 3 : 25.50g, Li 2 CO 3 : 9.60g, WO 3 : 55.90g, B 2 o 3 : 10.30g, Lu 2 o 3 : 7.10g, CeO 2 : After 0.03 g, it was mixed in a mortar and filled in the above-mentioned crucible. This crucible 1 carries out temperature control by arranging heater 2 around it, with Figure 6 The indicated heating curves cultivate crystallization. Figure 6 The vertical axis is temperature, and the horizontal axis is time. The description during the cooling process is omitted.

[0111] In this example, from Figure 6 It can be seen that firstly, the temperature is raised to 1200° C. at 150° C. / Hr and maintained for 2 hours, and the seed crystal material 6 (a lutetium borate crystal with a width of 3 mm and a thickness of 2 mm) installed at the front end of the pulling shaft 5 is lowered from the...

Embodiment 3

[0119] In this example, use figure 2 The shown apparatus grows crystals by the TSSG method. Prepare a platinum crucible 1 with a diameter of 50 mm and a depth of 50 mm, and weigh Na 2 CO 3 : 19.80g, Li 2 CO 3 : 13.80g, WO 3 : 57.70g, B 2 o 3 : 9.30g, Lu 2 o 3 : 3.50g, CeO 2 : 0.03g. After that, they were mixed in a mortar and filled in the above-mentioned crucible. This crucible 1 carries out temperature control by arranging heater 2 around it, with Figure 8 The indicated heating curves cultivate crystallization. Figure 8 The vertical axis is temperature, and the horizontal axis is time. The description during the cooling process is omitted.

[0120] In this example, from Figure 8 It can be seen that, firstly, the temperature is raised to 1120° C. at 150° C. / Hr and maintained for 2 hours, and the seed crystal material 6 (a lutetium borate crystal with a width of 3 mm and a thickness of 2 mm) installed at the front end of the pulling shaft 5 is lowered from t...

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Abstract

A method for producing a single crystal scintillator material, which comprises a step wherein a Ce compound and a Lu compound are mixed into a solvent which contains one or more elements selected from Li, Na, K, Rb and Cs, W and / or Mo, B and oxygen, and then the resulting mixture is heated to a temperature not less than 800 DEG C but not more than 1350 DEG C, thereby melting the compounds, and a step wherein a single crystal represented by the following composition formula: (CexLu1-x)BO3 with a composition ratio x of Ce satisfying 0.0001 <= x <= 0.05 is grown by deposition by cooling the molten compounds.

Description

technical field [0001] The invention relates to a single crystal scintillator material for a positron emission tomography device and a manufacturing method thereof. Background technique [0002] In recent years, in the medical field, diagnosis using Positron Emission Tomography (hereinafter referred to as "PET") has been widely performed, and in order to realize a PET device with higher performance, excellent scintillator material exploration. [0003] The scintillator material of PET is necessary for the detection of gamma rays. So far, BGO (Bismuth germanium oxide: bismuth germanate), LSO (Lutetium silicone oxide: lutetium silicate), GSO (Gadolinium silicone oxide: gadolinium silicate), LYSO Single crystal scintillator materials such as Lutetium yttrium silicone oxide (Lutetium yttrium silicate) are suitable for PET. The characteristics of scintillator materials are evaluated by the amount of light emitted (fluorescence output), fluorescence decay time, energy resolution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C09K11/00C09K11/08C09K11/78G01T1/202
CPCG21K4/00C30B11/00C30B11/14C30B17/00C30B9/10C09K11/778C30B29/22G01T1/202C30B29/10
Inventor 奥田裕之冈本直之伊藤进朗
Owner PROTERIAL LTD
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