X-ray phosphor composition and x-ray intensifying screen employing same
AssigneeGTE Sylvania Incorporated
InventorsRobert Wade Wolfe, Russell Francis Messier
Life of this patent
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Abstract
A mixture of from 5% to 95% by weight of calcium tungstate and from 5% to 95% of europium activated barium fluorochloride exhibits brightness and x-ray absorption characteristics superior to that which would be predicted from the foregoing properties of the individual phosphors. Intensifying screens employing the above mixtures have a speed in excess of the commercially available intensifying screens using the present calcium tungstate x-ray phosphors.
Claims6
An x-ray luminescent composition consisting essentially of from about 5% to about 95% by weight of calcium tungstate and from about 5% to about 95% of a europium-activated barium fluorochloride.
An x-ray intensifying screen comprising a supporting base of material transparent to x-rays, a layer of an x-ray luminescent composition as a coating on said base, said composition consisting of from about 5% to about 95% by weight of calcium tungstate and from about 5% to about 95% by weight of a eruopium-activated barium fluorochloride and a thin protective covering layer over said phosphor layer, said coating layer being substantially transparent to visible light.
Dependencies are inferred from the claim text.