Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1989-11-16
1990-12-25
Cooper, Jack
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
2523014F, 428690, C09K 1167
Patent
active
049805606
ABSTRACT:
An intensifying screen is disclosed containing a phosphor composition comprised of monoclinic crystals of a titanium activated hafnia phosphor host containing scandium ions or scandium ions in combination with neodymium ions. Scandium increases speed while reducing afterglow while the further addition of neodymium allows afterglow to be eliminated. A phosphor composition in which zirconia is at least partially substituted for hafnia is also disclosed.
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RPA-1 Bryan et al., U.S. Ser. No. 305,222, Filed Feb. 3, 89, Titled X-Ray Intensifying Screen, Phosphor Composition, and Process of Phosphor Preparation.
RPA-2 Bryan et al., U.S. Ser. No. 305,310 Filed Feb. 3, 1989, now abandoned in favor of U.S. Ser. No. 393,602, filed Aug. 14, 1989, titled Phosphor Composition and X-Ray Intensifying Screen.
RPA-3 Bryan et al., U.S. Ser. No. 437,464, filed Concurrently herewith, each titled X-Ray Intensifying Screen and Phosphor Composition.
Bryan Philip S.
Jarrold Gregory S.
Lambert Patrick M.
Towers Christine M.
Cooper Jack
Eastman Kodak Company
Thomas Carl O.
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