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Lead 210 dating lake sediments

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Dating of Sediments using Lead-210

Please go to http: Understanding the Pb Method The Pb method is used to determine the accumulation rate of sediments in lakes, oceans and other water bodies. In a typical application, the average accumulation rate over a period of - years is obtained. From the accumulation rate, the age of sediment from a particular depth in the sediment column can be estimated. Pb is a naturally occurring radioactive element that is part of the uranium radioactive decay series. The radioactive element uranium has an almost infinite half-life 4. Although the concentration of uranium varies from location to location, it is present in essentially all soils and sediments, at least at some low level. Radium in the soil exhibits the same level of radioactivity as uranium from which it was originally derived, because of a natural phenomenon called secular equilibrium.

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Epub Jul Problems with the dating of sediment core using excess Pb in a freshwater system impacted by large scale watershed changes. Pb dating of freshwater and coastal sediments have been extensively conducted over the past 40 years for historical pollution reconstruction studies, sediment focusing, sediment accumulation and mixing rate determination. In areas where there is large scale disturbance of sediments and the watershed, the vertical profiles of excess Pb Pbxs could provide erroneous or less reliable information on sediment accumulation rates. We analyzed one sediment core from Hendrix Lake in southwestern Arkansas for excess Pb and Cs.

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Dating of Sediments using Lead The naturally lead isotope Pb may be used to date aquatic sediments and peat bogs. The method is suitable for dating approximately years back. Service DHI offers dating of sediment cores by means of the Pb method and may assist with sampling in both marine and freshwater systems. The sediment samples must remain totally undisturbed during sampling to obtain the best possible dating. Subsequently, they are cut into slices of approximately 1 cm and dried, whereupon the content of dry matter and possibly the loss on ignition are determined.

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