Abstract
Sediment samples were obtained during July 2012 in five intertidal muddy, La Coruña, Pontedeume, Cedeira, Betanzos and Ferrol. The cores (L, P, C, B and F) were carefully collected with a hand-driven PVC coring pipe of 60.2 mm inner diameter. Recoveries were 50 cm. Cores were collected in the inner part of the Rias, sliced in situ in 25 layers of 2-cm thickness obtaining 125 samples, stored in pre-cleaned plastic zip bags, and kept at 4 \(^{\circ }\)C. Sediment sub-samples were dried at 45 ± 5 \(^{\circ }\)C to constant weight, and water content was determined. The chronologies and sediment accumulation rates for the five sediment cores have been established by applying three physical-mathematical models, C.F:C.S (Constant Flux: Constant Sedimentation), C.R.S (Constant Rate and Supply) and C.R.S—M.V (Constant Rate and Supply—Minimum Variances) which are based on obtaining in-excess \(^{210}\)Pb (\(^{210}\)Pb\(_{\text {unsupported}})\) (R. García Tenorio, The \(^{210}\)Pb dating method and its application in sediments, 1988). The resulting chronologies were validated using the pollution (L. Eduardo et al., A 700 year record of combustion-derived pollution in northern Spain: Tools to identify the Holocene/Anthropocene transition in coastal environments, 2014; F. Martín Garrido, Evaluación mediante datación con \(^{210}\)Pb del efecto antropogénico en los procesos de sedimentación de las Rías de Vigo y Muros, 2006) instead of using the artificial fallout radionuclides \(^{137}\)Cs and \(^{241}\)Am because for \(^{137}\)Cs migration is observed and \(^{241}\)Am is not observed. Finally, the model that best fits for the pollution data in the study areas has been the CRS model. In the Ferrol sediment core it was necessary to join layers, since the amount of sample collected in each section was insufficient. Therefore, boxes were filled with sediment corresponding to 4 cm layers loosing resolution.
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Pedrosa-García, M.C. (2016). \(^{210}\)Pb-Dating of Pb Deposition in Five Sediment Cores from Ria of Vigo (NW Spain): \(\upgamma \)-Spectrometry and CRS Model. In: García-Ramos, JE., Alonso, C., Andrés, M., Pérez-Bernal, F. (eds) Basic Concepts in Nuclear Physics: Theory, Experiments and Applications. Springer Proceedings in Physics, vol 182. Springer, Cham. https://doi.org/10.1007/978-3-319-21191-6_11
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