The measurement of low concentrations of radon-222 daughters in air, with emphasis on RaA assessment

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Abstract
A number of methods exist for the measurement of the activity concentrations of 222Rn daughters in air but in most cases interest in directed on determining the working levels. In those instances where individual daughter activity concentrations are assessed the precision of the assessment of RaA (218Po) is poor unless spectrometry is used. In environmental monitoring the measurement of RaA activity concentrations is a reliable indicator of Rn daughter activity concentration measurement, a method is given which enables activity concentrations as low as 0.05 pCi l-1 (50 pCi m-3) of RaA to be measured with simple, readily transportable equipment. The method presented here also measures RaB (214Pb) and RaC (214Bi) activity concentrations and working levels with improved precision compared with established methods.