Structured X-ray phosphor screen

Details Structured X-ray phosphor screen Structured X-ray phosphor screen

1975-04-28

1977-03-08

Borchelt, Archie R.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

250486, 250487, G01J 158

Patent

active

040114546

ABSTRACT:
A phosphor screen for converting x-rays to light includes a large number of discrete columns of the phosphor material, say doped CsI, with the spaces therebetween preferably filled with a reflective substance, which itself may be a phosphor (e.g., Gd.sub.2 O.sub. 2 S or La.sub.2 O.sub. 2 S). Because of the resulting inhibition of lateral spread of light within the phosphor screen, it may be made thicker than conventional screens while achieving at least as high resolution and contrast, thereby increasing brightness (and thus requiring lower x-ray "doses"). A method for making the screen includes using a patterned substrate and wide-angle vapor deposition (as in a hot-wall evaporator) so as to deposit the phosphor only on the raised portions of the substrate.

REFERENCES:
patent: 3360450 (1967-12-01), Hays
patent: 3769059 (1973-10-01), Driard et al.
patent: 3857036 (1974-12-01), Novak
patent: 3868512 (1975-02-01), Prener et al.

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