PHOSPHORS, AND RADIATION DETECTORS AND X-RAY CT UNIT MADE BY USING THE SAME

Title:

PHOSPHORS, AND RADIATION DETECTORS AND X-RAY CT UNIT MADE BY USING THE SAME

Document Type and Number:

WIPO Patent Application WO/1999/033934

Kind Code:

A1

Abstract:

Novel phosphors represented by the general formula: (Gd¿1-x?Ce¿x?)¿3?Al¿5-y?Ga¿y?O¿12? (wherein x is a value satisfying the relationship: 0.0005$m(F)x$m(F)0.02; and y is a value satisfying the relationship: 0 < y < 5). These phosphors exhibit high fluorescence outputs by virtue of the Al and Ga coexistent with the Gd phosphors. In particular, when the Ga concentration (y) lies within the range of 2 to 3, the phosphor exhibits a fluorescence output as high as twice that of the phosphor of the prior art. Radiation detectors wherein the phosphors are used as the ceramic scintillator exhibit extremely low afterglow and high scintillation outputs.

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Inventors:

YAMADA HIROMICHI (JP)
SATO MAKOTO (JP)
MIURA ICHIRO (JP)
DOI MOTOMICHI (JP)
KOBIKI TAKAAKI (JP)

Application Number:

PCT/JP1998/005806

Publication Date:

July 08, 1999

Filing Date:

December 22, 1998

Export Citation:

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Assignee:

HITACHI MEDICAL CORP (JP)
YAMADA HIROMICHI (JP)
SATO MAKOTO (JP)
MIURA ICHIRO (JP)
DOI MOTOMICHI (JP)
KOBIKI TAKAAKI (JP)

International Classes:

C09K11/77; C09K11/80; (IPC1-7): C09K11/80; C09K11/00; G01T1/20; A61B6/03

Foreign References:

JPH04288393A	1992-10-13
JPH04289483A	1992-10-14
JPS49106486A	1974-10-09

Other References: