After applying the CRS model, ages and sedimentation rates were calculated.The average sedimentation rate of the Cruhlig Lake is 0.21 ± 0.02 g/cm(2)y, Minimum values (0.05 ± 0.003 g/cm(2)y) are registered along the eastern shoreline of the lake before 1913, while maximum values are recorded due to the flooding in 2006 in the western side (1.34 ± 0.12 g/cm(2)y).The total (210)Pb content was measured via (210)Po by alpha spectrometry, while supported (210)Pb was measured by (226)Ra (trough short life (222)Rn daughters) with HPGe detectors.
The activity concentrations of the soil samples were measured by gamma spectrometry (HPGe detector) for both 210Pbtotal, 210Pbsup (226Ra) and 137Cs, while peat samples were measured by both alpha (210Po) spectrometry (PIPS detectors) as well.
The mean value for the 210Pb flux was measured in the Danube Delta region (42±8 Bq m−2 yr−1), while the highest was measured in the Semenic Peatbog (227±54 Bq m−2 yr−1); the average being 132±8 Bq m−2 yr−1.
The Danube Delta is the second largest river delta in Europe, having an approximate surface of 4152 km2.
The Danube branches into three main distributaries into the delta: Chilia, Sulina and Sfântul Gheorghe.
The values of the sedimentation rates have grown multiply in the last three decades: 2.66 times in case of the St.