Fast determination of indoor radon (Rn-222) concentration using liquid scintillation counting

摘要

The indoor Rn-222 radionuclide was directly absorbed in typical 20 ml glass scintillation vials by passing -3 dm(3) of ambient air through 16 ml of water-immiscible non-volataile scintillation cocktail Ultima-Gold F for 10 min. The activity of radon and its two alpha-emitting daughters: Po-218 and Po-214, was determined with the BetaScout low-background liquid scintillation counter. The limit of Rn-222 detection is 9 Bq/m(3), and the quantification limit with 20% relative accuracy is 28 Bq/m(3). The results of the indoor Rn measurement in different houses showed good consistency with results obtained from a Sarad EQF 3220 device.