Correcting for potential 222Rn loss in 210Pb dating of sediments from the South Adriatic Pit |
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| Institution: | 1. Environment Canada and Climate Change, Canada Centre for Inland Waters, Burlington, Ontario L7S 4A1, Canada;2. Ministère du Développement durable, de l''Environnement, de la Faune et des Parcs, Québec G1R 5V7, Canada;3. Environment Canada and Climate Change, National Hydrology Research Centre, Saskatoon, Saskatchewan S7N 3H5, Canada;4. Environment Canada and Climate Change, Canadian Rivers Institute, Department of Biology, University of New Brunswick, Fredericton, NB, E3B 6E1, Canada;5. Department of Geography, Western University, London, Ontario, N6A 3K7, Canada |
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| Abstract: | Measurement of 226Ra activity concentrations is often used to estimate supported levels of 210Pb for purposes of geochronology. However, the implicit assumption that supported 210Pb and 226Ra are in secular radioactive equilibrium may not always be true because of the migration of an intermediate product, gaseous 222Rn. As a consequence, supported 210Pb activity concentration might be lower than the measured 226Ra value, which was the case in a core collected from the South Adriatic Pit. Here we present a new approach to improve the determination of supported 210Pb, which is based on correction of 226Ra activity concentrations using the average (210Pb/226Ra) activity ratio in deeper sediment layers. Using this approach, sedimentation rates for the South Adriatic Pit with a constant rate of supply model and a constant initial concentration model were 0.054 g/cm2/a and 0.070 g/cm2/a, respectively. |
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| Keywords: | Sediments Adriatic Sea South Adriatic Pit |
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