Continous photocathode for X-ray radiography having two-dimensio

Details Continous photocathode for X-ray radiography having two-dimensio Continous photocathode for X-ray radiography having two-dimensio

1977-01-14

1978-09-26

Segal, Robert

Electric lamp and discharge devices

Secondary emission prevention

Nonemissive material

250315A, 313374, H01J 3906, H01J 3149

Patent

active

041173651

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: 2716203 (1955-08-01), Sen et al.
patent: 3519873 (1970-07-01), O'Keeffe
patent: 3769059 (1973-10-01), Driard et al.
patent: 3783297 (1974-01-01), Houston
patent: 3783298 (1974-01-01), Houston
patent: 3783299 (1974-01-01), Houston
patent: 3879626 (1975-04-01), Washington et al.
patent: 3940620 (1976-02-01), Houston et al.
KH Reiss et al., Electroradiography; Some Remarks on its Technique and Future, 18 Phys. Med. Biol. 695 (1973).
J. A. Batt et al., Optical Properties of Unidirectionally Solidified NaF-Na-Cl Eutectic 48 Ceramic Bulletin 622 (1969).

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