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Thank you for visiting nature. You are using a browser version with limited support Roommate finder vancouver wa CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. Lead Pb released from anthropogenic sources and stored in environmental repositories can be a potential source for secondary pollution.

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: azimmer ufl. Reliable sedimentation histories are difficult to obtain in sandy or anthropogenically impacted coastal systems with disturbed sediment profiles and low initial radionuclide activities.

Non-steady sedimentation and nuclide scavenging processes are shown to limit application of traditional radiometric dating models in this system. Activities of three radioisotopes used for sediment dating Ra, Pb, and Cs were compared with grain size and organic matter OM distributions to assess the factors that influence accumulation of radionuclides.

Regression analysis indicated Lady wants casual sex PA Philadelphia 19111 radionuclide activities were more strongly correlated with OM content than with grain size parameters, and a novel OM-normalisation procedure was developed to correct for preferential nuclide associations.

Normalised Pb xs profiles provide evidence for shifts in sedimentation rates and episodic erosion events in regions of the estuary where anthropogenic disturbance is known to have occurred. Our emphasise the need to Hot horny girls Wentworth Location radionuclide scavenging by OM in sandy coastal sediments when establishing sedimentation histories.

Additional keywords: Cs, estuaries, grain size effect, organic matter, Pb, preferential scavenging, radioisotopes, Ra Sincere thanks are extended to Jason Curtis for guidance in the laboratory, to Kathy Worley for field assistance Pet monkeys for sale in illinois Naples, and to Michael Macaluso for graphics.

We particularly appreciate detailed reviews from Andrew Boulton and anonymous referees, which led to ificant improvement of the manuscript.

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Search our journals. Next Contents Vol 61 Abstract Reliable sedimentation histories are difficult to obtain in sandy or anthropogenically impacted coastal systems with disturbed sediment profiles and low initial radionuclide activities. View Dimensions.

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