An improved method for low-level222Rn determination in environmental waters by liquid scintillation counting with pulse shape analysis
A method in which222Rn is extracted from 0.5 1 water samples to 20 ml toluene is described. 10 ml toluene solution with extracted222Rn is directly added to a glass scintillation vial containing 10 ml of liquid naphthalene based scintillation cocktail. Apart from diluting by toluene, the final counting solution still has excellent properties in terms of: α/β separation by pulse shape analysis, detection efficiency and background in the α-region. The detection limit of222Rn for 0.5 1 water samples was 1.5 mBq l−1 (for 12,000 s count time). The concentration of222Rn in different environmental samples such as rain, tap and mineral waters as well as deep well waters were determined.
KeywordsToluene Water Sample Naphthalene Environmental Sample Mineral Water
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