Process of making structured x-ray phosphor screen

Details Process of making structured x-ray phosphor screen Process of making structured x-ray phosphor screen

1976-08-20

1978-01-17

Kendall, Ralph S.

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

250483, 250486, 427 69, 427248R, 427248J, 427259, 427282, 427264, 427275, 427380, 427161, H01J 162

Patent

active

040693554

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 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
patent: 3783297 (1974-01-01), Houston
patent: 3783298 (1974-01-01), Houston
patent: 3783299 (1974-01-01), Houston
patent: 3857036 (1974-12-01), Novak
patent: 3868512 (1975-02-01), Prener
patent: 3873065 (1975-03-01), Wolf
patent: 3930065 (1975-12-01), Baker

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