Abstract
The pulse decay discrimination (PDD) liquid scintillation technique has been applied to optimise radon counting by the Pico-Rad method. A dermination limit (with 10% relative error) of 4.8 Bqm−3 for indoor radon measurement has been achieved for optimal PDD setting with a radon elution cocktail containing 20% (v/v) of Ultima Gold AB in Instafluor. From a practical point of view this procedure allows a shortening of the counting time to 1 hour after 48 hours exposure to detectors. This method has been applied to indoor radon determinations in 626 places (municipal offices and private dwellings) in the Lodz region. These measureents resulted in an average concentration of 21.4 Bqm−3 and a median value of 15.1 Bqm−3. Analysis of the data indicates that most indoor radon comes from the underlying soil, which contains relatively little226Ra (10–20 Bqkg−1).
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