Biogeochemical signatures in the lichen Hypogymnia physodes in the mid Urals.
作者： O.W. Purvis , J. Longden , G. Shaw , P.D.J. Chimonides , T.E. Jeffries
DOI: 10.1016/J.JENVRAD.2006.06.008
关键词:
摘要: Multi-element content and uranium (U) isotopes were investigated in the lichen Hypogymnia physodes (native transplants) sampled across a 60-km transect, centred on Karabash smelter town, from Turgoyak Lake (SW) to Kyshtym (NE) investigate origin of U. was site major nuclear accident 1957. (234)U/(238)U activity ratios native thalli during July 2001 within natural isotopic ratio minerals. Uranium/thorium (U/Th) higher towards NE (average 0.73) than those SW 0.57). Element signatures transplants suggest U derived fossil fuel combustion sources lying further east. Systematic significant enrichment indicative cycle source not detected any sample. epiphytic provide powerful method evaluate deposition.
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