Title: Gridded ionization chamber

Abstract: An improved ionization chamber type x-ray detector comprises a heavy gas at high pressure disposed between an anode and a cathode. An open grid structure is disposed adjacent the anode and is maintained at a voltage intermediate between the cathode and anode potentials. The electric field which is produced by positive ions drifting toward the cathode is thus shielded from the anode. Current measuring circuits connected to the anode are, therefore, responsive only to electron current flow within the chamber and the recovery time of the chamber is shortened. The grid structure also serves to shield the anode from electrical currents which might otherwise be induced by mechanical vibrations in the ionization chamber structure.

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Inventors: Houston, John M. (Schenectady, NY, US)

Application Number: 683908
Filing Date: 1976-05-06
Publication_date: 1977-09-06
Assignee: General Electric Company (Schenectady, NY)
Primary Class(es): 250/385.1 250/389
Other Classes:
US Patent Ref:

2741709	Apr, 1956	Tirico et al.	250/385.
3373283	Mar, 1968	Lansiart et al.	250/389.
3676682	Jul, 1972	Falk	250/385.
3836780	Sep, 1974	Amquist et al.	250/385.
3898465	Aug, 1975	Zaklad et al.	250/389.

Other Refs:
Primary Examiner: Borchelt, Archie R.
Assistant Examiner:
Attorney: Haken; Jack E., Cohen; Joseph T., Squillaro; Jerome C.