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• W2089188184 abstract "An experimental procedure has been developed for a rapid determination of the activity concentration of 226Ra and 224Ra in sediments by liquid scintillation counting. The importance of the method lies in its application to the measurement of sediments where the Ra-isotopes activity concentration has been increased due to an anthropomorphic enhancement based on releases of naturally occurring radioactive material (NORM). A sample pre-treatment, including a digestion with aqua regia and a precipitation of hydroxides, was applied to samples before the radium extraction, which was made by co-precipitation with barium. Measurements were done in a low background scintillation spectrometer Quantulus 1220, which can separate and detect simultaneously α and β particles. Additionally, some improvements are suggested for a better α and β interference correction of the results. The obtaining of radiochemical yields is also improved using 133Ba as tracer, which decays by emission of conversion electrons and γ-rays; the wide range of radiochemical yields obtained confirms the need of this analyses. The procedure has been applied to the measurement of riverbed sediments from an estuary in the south-west of Spain, affected in the past by direct and indirect phosphogypsum discharges." @default.
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• W2089188184 date "2005-10-01" @default.
• W2089188184 modified "2023-10-03" @default.
• W2089188184 title "Determination of 226Ra and 224Ra in sediments samples by liquid scintillation counting" @default.
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• W2089188184 doi "https://doi.org/10.1016/j.radmeas.2004.10.004" @default.
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