Sep 19, 2013. The Radiological Impact of 210Pb and 210Po Released from the Iron-. The detailed information about the sampling site, strategy, date, and. result is a relatively high concentration of Pb-210 in the shallow sediments.. core sampling date is equal to the depth divided by the sedimentation rate. Abstract Topmost sediments in two oligotrophic lakes of the High Tatra Mountains were studied in terms of sedimentological characteristics and 210Pb dating.