Gridded ionization chamber

Radiant energy – Invisible radiant energy responsive electric signalling – Including a radiant energy responsive gas discharge device

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250389, G01T 118

Patent

active

040470407

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.

REFERENCES:
patent: 2741709 (1956-04-01), Tirico et al.
patent: 3373283 (1968-03-01), Lansiart et al.
patent: 3676682 (1972-07-01), Falk
patent: 3836780 (1974-09-01), Amquist et al.
patent: 3898465 (1975-08-01), Zaklad et al.

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