Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Screen other than for cathode-ray tube
Patent
1980-12-19
1982-02-16
Hearn, Brian E.
Radiation imagery chemistry: process, composition, or product th
Radiation modifying product or process of making
Screen other than for cathode-ray tube
250483, 250486, 2523014H, G01J 158, C09K 1146
Patent
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.
Brines Marjorie J.
Rabatin Jacob G.
General Electric Company
Hearn Brian E.
Kempton Lawrence R.
McDevitt John F.
Schlamp Philip L.
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