Electrostatic X-ray image recording device with mesh-base photoc

Details Electrostatic X-ray image recording device with mesh-base photoc Electrostatic X-ray image recording device with mesh-base photoc

1976-08-13

1977-08-02

Church, Craig E.

Radiant energy

Source with charged plate-type detector

250315A, G03B 4116

Patent

active

040398307

ABSTRACT:
An electrostatic X-ray image recording device having a pair of spaced electrodes with a gas-filled gap therebetween, and including discrimination means, having a conductive mesh supporting a photocathodic material, positioned in the gas-filled gap between a first electrode having a layer of ultraviolet-emitting fluorescent material and a second electrode having a plastic sheet adjacent thereto for receiving photoelectrons emitted by the photocathodic material and accelerated to the second electrode by an applied field. The photoconductor-mesh element discriminates against fast electrons, produced by direct impingement of X-rays upon the photocathode to substantially reduce secondary electron production and amplification, thereby increasing both the signal-to-noise and contrast ratios. The electrostatic image formed on the plastic sheet is developed by zerographic techniques after exposure.

REFERENCES:
patent: 3932750 (1976-01-01), Reiss
patent: 3940620 (1976-02-01), Houston

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