Abstract
AbstractThe sediments of two lakes located in the Baltic Uplands, the western part of the East European Plain (East Lithuania and North East Poland), were studied. Activity concentration of210Pb was determined using two nuclear analytical techniques: determination of210Pb in equilibrium with its beta emitting daughter210Bi using liquid scintillation counter (LSC), and direct determination of210Pb (and other radionuclides) by low-background gamma-ray spectrometer with a well type HPGe detector. For the210Pb determination by LSC the methodology of lead separation based on the anion exchange resin in Cl–form (Eichrom) was used. Several steps of radiochemical procedures and respective parameters were investigated additionally. The optimized procedures for LSC method were used for case study with two lake cores. The activity concentration of210Pb in lake sediment samples based on both nuclear analytical techniques (LSC and HPGe) were compared.210Pb dating of cores was performed according to Constant Rate of210Pb Supply (CRS) model with some modifications. Both techniques in the range of uncertainties gave similar results. From two considered lakes, the more eutrophic one exhibited higher sediment mass accumulation rate (MAR) values.
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