A High-sensitivity Rn Detector Incorporating A Particle Generator

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Abstract
A particle generator has been incorporated into a two-filter Rn detector to eliminate plate-out, thus increasing the number of Rn progeny collected on the outlet filter. Recording the activity of this filter by a zinc sulphide screen and photomultiplier has enabled Rn levels as low as 0.05 Bq m−3 to be detected. The theory of operation of the detector and details of the design of a 2-m3 detector are presented, and its performance discussed.

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