Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1989-02-03
1991-01-29
Cooper, Jack
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
2523014F, 428690, C09K 1167
Patent
active
049888803
ABSTRACT:
An intensifying screen for producing a latent image in a silver halide radiographic element when imagewise exposed to X-radiation is disclosed. The screen contains a phosphor having a hafnia host containing zirconia in concentrations higher than those found in optical grade hafnia. The phosphor can include as an activator one or a combination of titanium, rare earth, and alkali metal ions. Phosphor preparation processes are also disclosed.
REFERENCES:
patent: 2314699 (1943-03-01), Hale
patent: 2402760 (1946-06-01), Leverenz
patent: 2542336 (1951-02-01), Kroger et al.
patent: 3640887 (1972-02-01), Anderson
patent: 3905911 (1975-09-01), Kelsey et al.
patent: 3905912 (1975-09-01), Mathers
patent: 3941715 (1976-05-01), Shidlovsky
patent: 4006097 (1977-02-01), Kelsey
patent: 4014812 (1977-03-01), Kelsey et al.
patent: 4068128 (1978-01-01), Chenot et al.
patent: 4112194 (1978-09-01), Chenot et al.
patent: 4153469 (1979-05-01), Alexandrov et al.
patent: 4295989 (1981-10-01), Klein et al.
Bryan et al U.S. Ser. No. 305,310, filed Feb. 3, 1989, and commonly assigned, titled Phosphor Composition and X-Ray Intensifying Screen.
D. K. Smith and H. W. Newkirk, "The Crystal Structure of Baddeleyite (Monoclinic ZrO.sub.2) and its Relation to the Polymorphism of ZrO.sub.2 ", Acta Cryst., 18, 1965, pp. 983-991.
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.
McCauley et al, "J. of Lumin." 6, (1973), pp. 105-115.
Bryan Philip S.
Jarrold Gregory S.
Lambert Patrick M.
Towers Christine M.
Cooper Jack
Eastman Kodak Company
Thomas Carl O.
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