The measurement of low concentrations of radon-222 daughters in air, with emphasis on RaA assessment.
A number of methods exist for the measurement of the activity concentrations of radon-222 daughters in air but in most cases interest is centred 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 radon activity concentrations. Following a brief review of established methods of radon daughter activity concentration measurement, a method is given which enables activity concentrations as low as 0.05 pCi l-1 (50 pCim-3) of RaA to be measured with simple readily transportable equipment. The method presented here also measures RaB (214Pb) and RaC (214 Bi) activity concentrations and Working Levels with improved precision compared with established methods.
D000393:Air Pollutants / Q000032:analysis*; D000396:Air Pollutants, Radioactive / Q000032:analysis*; D011834:Radiation Monitoring / Q000379:methods*; D011886:Radon
D000393:Air Pollutants; D000396:Air Pollutants, Radioactive; D011886:Radon