Apparatus for X-ray radiography

Details Apparatus for X-ray radiography Apparatus for X-ray radiography

1978-05-08

1979-04-17

Segal, Robert

Electric lamp and discharge devices

Secondary emission prevention

Nonemissive material

313 96, H01J 3906, H01J 3902

Patent

active

041503155

ABSTRACT:
Apparatus for X-ray radiography includes a conductive cathode, receiving X-radiation differentially attenuated by passage through an object to be studied, and a conductive anode spaced from the cathode and bearing a sheet of insulative material upon which a charge image of the object is to be formed; and a structured photocathode extending from the cathode towards the anode. The photocathode, formed of cesium iodide and the like, is of relative great thickness and surface area to have large X-ray quantum absorption and photoelectron emission, whereby a lower exposure dosage of X-radiation is required for a radiographic exposure. A plurality of different photocathode structures are disclosed.

REFERENCES:
patent: 2782332 (1957-02-01), Sheldon
patent: 3387162 (1968-06-01), Schagen et al.
patent: 3783298 (1974-01-01), Houston
patent: 3940620 (1976-02-01), Houston et al.

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