Ion chamber array with reduced dead space

Details Ion chamber array with reduced dead space Ion chamber array with reduced dead space

1978-05-18

1983-03-15

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250385, G01T 118

Patent

active

043768938

ABSTRACT:
An ionization chamber for use in determining the spatial distribution of x-ray photons in computerized tomography systems comprises a plurality of substantially parallel, planar anodes separated by parallel, planar cathodes and enclosed in a gas of high atomic weight at a pressure from approximately 10 atmospheres to approximately 50 atmospheres. X-ray radiation enters the chamber through a thin conductive window disposed substantially perpendicular to the anodes and cathodes. A dielectric layer disposed on the inner surface of the window accumulates charge during x-ray irradiation to modify the electric field in the region between the anodes, cathodes, and window so as to permit the collection of electrons and ions produced by interactions in that region.
In a preferred embodiment, a conductive electrode is placed on the inner surface of the dielectric layer and maintained at anode potential to modify and stabilize the electric field behind the window and thus stabilize the detector characteristics.

REFERENCES:
patent: 2649554 (1953-08-01), Anton
patent: 3296478 (1967-01-01), Ichinokawa
patent: 3418474 (1968-12-01), Spergel et al.
patent: 3509339 (1970-04-01), Doehner
patent: 3930162 (1975-12-01), Reiss

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