X-ray to visible image converter with a cathode emission layer h

Details X-ray to visible image converter with a cathode emission layer h X-ray to visible image converter with a cathode emission layer h

1991-03-06

1993-07-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313530, H01J 3150

Patent

active

052256707

ABSTRACT:
High quantum efficiency (.gtoreq.5%) ultrafast (.ltoreq.100 picosecond) and broad band (30 KeV to 80 KeV for medical application) X-ray photo-electron cathode, high gain X-ray real time image intensifier and portable low intensity real time projection type X-ray imagescope use new vacuum photo-electron devices. A new type X-ray photo-electron cathode has a specially designed alkali halide electron emission layer that makes possible high quantum efficiency, high speed and broad band X-ray photon detection. An X-ray photo-electron cathode followed by a direct coupled micro channel plate and an output phosphor display screen form a new type panel shaped direct view X-ray intensifier tube which can have both high spatial resolution (.gtoreq.10 lp/mm) and high gain (.gtoreq.10.sup.4). The thickness of this panel shaped disc X-ray intensifier can be less than 1 cm. A portable real time projection X-ray imagescope which employs this new type X-ray intensifier and other devices (small x-ray tube, small built-in high voltage power supply) can be widely used for medical, industrial and security applications.

REFERENCES:
patent: 3716714 (1973-02-01), Niewold et al.
patent: 3961182 (1976-06-01), Spicer
patent: 4447721 (1984-05-01), Wang
patent: 4481531 (1984-11-01), Warde et al.
patent: 4725724 (1988-02-01), van der Velden
patent: 4882481 (1989-11-01), Gilligan et al.

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