Radiation excited phosphor screen and method for manufacturing t

Details Radiation excited phosphor screen and method for manufacturing t Radiation excited phosphor screen and method for manufacturing t

1981-06-11

1984-03-13

Anderson, Bruce C.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

2504831, G01J 158

Patent

active

044370113

ABSTRACT:
An input phosphor screen includes a substrate having a substantially smooth surface, and first and second phosphor layers both vapor-deposited sequentially on the substrate. The first layer is made of phosphor crystal particles having a mean diameter of 15 .mu.m or less. The second layer has a thickness ten or more times that of the first layer and is made of individual columnar crystals of alkali halide grown vertically on the crystal particles, standing close together with fine spaces therebetween. A third layer is preferably deposited on the second layer as a continuous film. These three layers can be deposited by evaporating a phosphor material or materials at a prescribed temperature and at a predetermined degree of vacuum.

REFERENCES:
patent: 3769059 (1973-10-01), Driard et al.
patent: 3825763 (1974-07-01), Cornelis et al.
patent: 3961182 (1976-06-01), Spicer
patent: 4023039 (1977-05-01), Galues et al.
patent: 4069355 (1978-01-01), Lubowski et al.
patent: 4101781 (1978-07-01), Neukermans et al.
patent: 4184077 (1980-01-01), Washida et al.
patent: 4209705 (1980-06-01), Washida et al.
"High Resolution Phosphor Screen for X-ray Image Intensifier", Washida et al., Adv. in Electronics and Electron Physics, vol. 52, 1979, pp. 201-207.

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