Rare earth oxyhalide phosphor and x-ray image converters utilizi

Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Screen other than for cathode-ray tube

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Details

250483, 250486, 2523014H, G01J 158, C09K 1146

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active

043159796

ABSTRACT:
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.

REFERENCES:
patent: 3591516 (1971-07-01), Rabatin
patent: 3617743 (1971-11-01), Rabatin
patent: 3795814 (1974-03-01), Rabatin
patent: 4029851 (1977-06-01), Degenhardt
patent: 4070583 (1978-01-01), Rabatin
patent: 4080306 (1978-03-01), Feretti
Matsubara, "Preparation of Infrared Stimulable Rare Earth Oxychloride Phosphors, " Mat. Res. Bull., vol. 7 (1972) pp. 963-970.

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