Abstract
Abstract A new method for the determination of radon in air has been developed. It is based on low temperature absorption of radon in ortho-xylene followed by liquid scintillation counting. The method is reasonably fast and sensitive enough to analyse air without preconcentration. The detection limit at the 95% confidence level for a 20 l air sample and a 1 h counting time is 2 mBq l −1. Radon concentrations measured in indoor air in Quebec varied from 7 to 162 mBq l −1.
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