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Uptake and long term behavior of naturally occurring radionuclides in tree rings of spruce

Haas, Gerald ; Schupfner, R. ; Müller, A.


The uptake and the radial distribution of naturally occurring radionuclides in the tree rings of a spruce tree were examined. The activity concentrations of Pb-210 are at a constant level of about 1,7 Bq/kg dry weight (dw) in older tree rings but decrease to younger ones. We suggest that Rn-222 dissolved in the soil water is taken up in significant amounts by the tree roots and decays to Pb-210 ...


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