Sources and accumulation of ~7Be, ~(210)Pb and ~(137)Cs isotopes in the annual needles of larch and cedar in Novy Urengoy region (Arctic part of Western Siberia)

摘要

Annual needles of larch and cedar were sampled in the tundra zone of the Arctic part of Western Siberia in order to determine ~7Be, ~(210)Pb and ~(137)Cs specific activities. Higher concentrations of ~(137)Cs in the needles of cedar relative to the needles of larch can be associated with a clear difference in the properties of accumulation and translocation of caesium among these species. Higher concentrations of ~7Be and ~(210)Pb in the needles of larch relative to cedar needles and close isotopic ratios (~7Be/~(210)Pb) are probably due to more efficient aerosol deposition on vegetative canopies of larch.