X-ray or .gamma.-ray image tube

Details X-ray or .gamma.-ray image tube X-ray or .gamma.-ray image tube

1975-07-08

1977-01-11

Segal, Robert

Electric lamp and discharge devices

Secondary emission prevention

Nonemissive material

250213VT, H01J 3918, H01J 3906

Patent

active

040029387

ABSTRACT:
The input screen 5 of an X-ray or .gamma. -ray image tube comprises a barrier layer 54 between scintillator 51 and photocathode 55, made of two sub-layers, one 52 of alumina, Al.sub.2 O.sub.3, 50 to 150 angstrom units in thickness, and the other of silicon sesquioxide Si.sub.2 O.sub.3, 200 to 1000 angstrom units in thickness. The photocathode is made of an alkaline antimonide and the scintillator of an alkaline halide.

REFERENCES:
patent: 2698912 (1955-01-01), Teves et al.
patent: 3163765 (1964-12-01), Niklas
patent: 3246200 (1966-04-01), Kanter

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