Radon in a Tourist Cave: a One Year Continuous Survey of the Concentrations of Attached and Unattached Radon Progeny and Radon

Radon, radon progeny and unattached radon progeny were measured in two chambers with different characteristics at the Jenolan Caves, New South Wales, Australia, in 1996. Meteorological parameters and condensation nucleus concentrations were measured in order to understand the processes governing the radon concentration and degree of disequilibrium with the progeny. One chamber was poorly ventilated, and rainfall proved to be the most important influence on radon concentration. The other was well ventilated, and most subject to strong convective flows driven by surface temperature. Under some conditions atmospheric pressure was an important factor.