Apparatus for X-ray radiography

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

1978-05-08

1979-04-03

Segal, Robert

Electric lamp and discharge devices

Secondary emission prevention

Nonemissive material

313 96, H01J 3906, H01J 3924

Patent

active

041479491

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: 3769059 (1973-10-01), Driard et al.
patent: 3814968 (1974-06-01), Nathanson et al.
patent: 3867662 (1975-02-01), Endriz
patent: 3940620 (1976-02-01), Houston et al.
patent: 4064439 (1977-12-01), Yang

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