Polluted sediments were collected in three sampling points in the Havana Bay.Sedimentation rates were estimated using two different radiometric approaches: the depth profiles of Pb has been measured to apply both the Constant Initial Concentration Method (CIC) and the Constant Rate of Supply Method (CRS) Dating Models.
The main application for these gamma spectrometers is for the radiometric dating of lake sediments via the measurement of 210Pb, 137Cs and 241Am.
Pb and porosity profiles in 12 freshwater sediment cores show that linear regression affords more reliable results.
The polynomial regression, while capable of predicting the values of the constant β or β′ derived from porosity data, gives reasonable results only when all the coefficients of the polynomial are of appropriate sign.
Whenever possible, two methods should be used for dating sediments because a rate, albeit erroneous, can be obtained isotopically in sediments that are mixed; accurate sedimentation rates are also difficult to determine where the time boundary is a zone rather than a horizon, where the historical record does not provide a precise date for the pollen horizon, or where scouring has removed some of the sediment above a dated pollen horizon.
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A special goal was to elucidate processes that might influence the distribution and fluxes of the radionuclide in ways that could effect 210Pb sediment dating.