The sediment chronology was determined using Lead-210 (Pb-210) and Cesium-137 (Cs-137) dating method. Profile distributions of Polonium-210 (Po-210) and Pb-210 were evaluated with regarding to sediment porosity, core location, bottom currents and prevalent winds. Max. Po-210 and Pb-210 activity concentrations are found as 193.83 +/- 4.43 and 187.84 +/- 4.84 Bq kg(-1) respectively. According to vertical radionuclide (Po-210/Pb-210) ratios, sediments especially in east part of the lake are rich with respect to the fecal pellets. Residence time of the Pb-210 is calculated as 1.9 months in the lake. Average sedimentation rate (0.359 +/- 0.012 cm year(-1)) in central area is higher than the near shore (0.137 +/- 0.006 cm year(-1)) one in Lake Bafa.