Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1990-07-20
1992-03-10
Cooper, Jack
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
2523014F, 428690, C09K 1167
Patent
active
050952188
ABSTRACT:
An intensifying screen for producing a latent image in a silver halide radiographic element upon exposure to an image pattern of X-radiation is disclosed. The intensifying screen contains a fluorescent layer containing a phosphor capable of absorbing X-radiation and emitting longer wavelength electromagnetic radiation comprised of monoclinic crystals of a titanium activated zirconium hafnium oxide phosphor host. The phosphor contains in an amount sufficient to enhance emission of the longer wavelength electromagnetic radiation at least one alkali metal in combination with at least one Group 14 dopant chosen from Periods 3, 4 and 5.
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L. H. Brixner, "Structural and Luminescent Properties of the Ln.sub.2 Hf.sub.2 O.sub.7 -type Rare Earth Hafnates", Mat. Res. Bull., vol. 19, pp. 143-149, 1984.
E. Iwase and S. Nishiyama, "Luminescence Spectra of Trivalent Rare Earth Ions", Proc. Intern. Sym. Mol. Struct. Spectry., Tokyo, 1962, A-407-1 to 7.
Bryan et al., U.S. Ser. No. 305,222, filed Feb. 3, 1989, titled X-Ray Intensifying Screen, Phosphor Composition, and Process of Phosphor Preparation, commonly assigned.
Bryan et al., U.S. Ser. No. 393,602, filed Aug. 14, 1989, titled Phosphor Composition and X-Ray Intensifying Screen, commonly assigned, a continuation-in-part of U.S. Ser. No. 305,310, filed Feb. 3, 1989, now abandoned.
Bryan Philip S.
Jarrold Gregory S.
Lambert Patrick M.
Towers Christine M.
Cooper Jack
Eastman Kodak Company
Thomas Carl O.
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