Radioisotope Be-7, Pb-210, Cs-137 and K-40 in the needles of larch and cedar in the 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 Be-7, Pb-210, Cs-137 and K-40 specific activities. Higher concentrations of Cs-137 and K-40 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 cesium and potassium among these species. Higher concentrations of Be-7 and Pb-210 in the needles of larch relative to cedar needles and close isotopic ratios (Be-7/Pb-210) are probably due to more efficient aerosol deposition on vegetative canopies of larch.