Improvements in ionisation chambers

Abstract

The invention provides for an ionisation chamber suitable for the detection of radioactive gas in air. The chamber has an annular collection electrode and an annular polarising electrode, each electrode having a diameter, a proximate end and a distal end, the proximate ends of both electrodes being fixed at a base plate, wherein each electrode is supported by an insulator, wherein the insulator supporting polarising electrode comprises an outer ring and an inner ring, the outer ring having a diameter corresponding that of the polarising electrode.

Dependencies are inferred from the claim text.