The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 1981
Filed:
Jul. 14, 1977
Francis N Shaffer, Towanda, PA (US);
GTE Products Corporation, Stamford, CT (US);
Abstract
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 Y.sub.1-a Gd.sub.a Ce.sub.x PO.sub.4 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 foregoing phosphors under x-ray excitation have a main band peak emission of about 355 nanometers and a main band width of about 15 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.