Oxide phosphor and radiation detector using it, and X-ray CT...

Details Oxide phosphor and radiation detector using it, and X-ray CT... Oxide phosphor and radiation detector using it, and X-ray CT...

2006-07-11

2006-07-11

Porta, David (Department: 2884)

X-ray or gamma ray systems or devices

Specific application

Computerized tomography

Reexamination Certificate

active

07076020

ABSTRACT:
An oxide phosphor includes an oxide consisting of at least Gd, Ce, Al, Ga, and O, and has the crystal structure of a garnet structure, the atomic ratio (Gd+Ce)/(Al+Ga+Gd+Ce) of which is more than 0.375 and 0.44 or less, and the atomic ratio Ce/(Ce+Gd) of which is 0.0005 or more and 0.02 or less. This oxide phosphor reduces composition misalignment occurring during sintering, being a drawback of a phosphor having (Gd1-xCex)3Al5-yGayO12composition, and has a property of extremely small afterglow and high luminescence efficiency. By using this oxide phosphor as a scintillator of a radiation detector having a light detector, the radiation detector with low afterglow and high output can be obtained. Further, by applying this radiation detector to an X-ray CT apparatus, a tomogram with high resolution and high quality can be obtained.

REFERENCES:
patent: 5484750 (1996-01-01), Greskovich et al.
patent: 5998925 (1999-12-01), Shimizu et al.
patent: 6246744 (2001-06-01), Duclos et al.
patent: 6538371 (2003-03-01), Duggal et al.

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