Pb 210 dating sediments consolidating unit investment trust
The CRS model assumes that the supply of Pbex to the accreting material is constant in time Appleby and Olfield,the initial Pb concentration in the sediments is variable, and the influx rate of sediment is variable Goldberg, and Appleby and Oldfield, CS model and the Pbex concentration follows an exponential decrease with mass depth Mabit et al.Loss of surface material during sediment sampling can generate inaccuracies in chronology as described by Farmer et al.The result of the dating is delivered in the form of a report stating the age of the sediment, the rate of sedimentation, the mixing depth and the mixing intensity.In addition, the results of the sensitivity analysis are reported.The naturally lead isotope Pb may be used to date aquatic sediments and peat bogs.The method is suitable for dating approximately years back.
The sediment samples must remain totally undisturbed during sampling to obtain the best possible dating.Dried, ground samples are weighed into centrifuge tubes. The mass of the tracer is precisely determined by weight.The residual siliceous solids are separated from the solution by centrifugation. A small silver plate is added to the solution with one side covered with adhesive glue.The analysis of either the daughter or grand daughter isotopes of Pb requires that the analyst make an additional assumption that Pb is present in equal concentration with the daughter isotopes.Therefore for Pb dating of sediments the analysis of the concentration of Po is equivalent to the measurement of Pb until the shorter lived isotope is radiochemically separated from the Pb.
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Scope of application Dating of sediment is used to calculate sedimentation rate and accumulation rates for different substances.