Rare earth oxyhalide phosphor and x-ray image converters...

Details Rare earth oxyhalide phosphor and x-ray image converters... Rare earth oxyhalide phosphor and x-ray image converters...

C - Chemistry, Metallurgy

09

K

31/126, 96/197,

C09K 11/77 (2006.01) G21K 4/00 (2006.01)

Patent

CA 1165558

ABSTRACT OF THE DISCLOSURE Rare earth oxyhalide phosphors activated with terbium and/or thulium ion are described exhibiting improved brightness which are particularly useful in x-ray image converter devices by reason of producing less light scattering and absorption as a result of superior crystalline characteristics. A multilayer x-ray screen construction utilizing said phosphor material is also described utilizing said phosphor material which exhibits improved image sharpness and a reduced crossover problem. An improved process for producing said phosphor material is further disclosed wherein the selected oxyhalide is recrystallized in a molten alkali metal halide flux to produce the superior crystalline characteristics.

391137

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