C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/126, 117/22
C09K 11/46 (1980.01)
Patent
CA 1108840
CERIUM ACTIVATED YTTRIUM GADOLINIUM PHOSPHATE X-RAY PHOSPHORS, PROCESS FOR PRODUCING SAME, AN X-RAY INTENSIFYING SCREEN EMPLOYING SAME ABSTRACT OF THE DISCLOSURE Cerium-activated yttrium gadolinium phosphate x-ray phosphors having a particle size of from about 4 to about 12 micrometers are prepared by solid state reaction techniques and followed by a firing in a reducing atmosphere to insure the cerium activator is in the plus 3 valence state. The x-ray phosphors can be represented by the formula Y1-aGda CexPO4 wherein a is a value between about 0.05 and about 0.3 and x is a value between about 0.005 and 0.25. The fore- going phosphors under x-ray excitation have a main band peak emission of about 355 nanometers and a main band width of about 75 nanometers. The x-ray screens employing the phosphors are conventional screens wherein the phosphor is disclosed upon a substrate which is suitable for x-ray intensifying screens.
274841
Gte Sylvania Incorporated
R. William Wray & Associates
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