Dating of sediments from four Swiss prealpine lakes with Pb-210 determined by gamma-spectrometry: progress and problems (Peer-Reviewed Article) - Detailansicht

Grunddaten

Titel der Arbeit (title)	Dating of sediments from four Swiss prealpine lakes with Pb-210 determined by gamma-spectrometry: progress and problems
Titel der Zeitschrift bzw. Zeitung	Journal of Environmental Radioactivity
Erscheinungsjahr	2015
Verlag (publisher)	Elsevier Ltd.
Seitenzahl (pages)	78-94
Band (volume)	2015, Volume 145
Publikationsart	Peer-Reviewed Article

Inhalt
Abstract	In this paper the most important problems in dating lake sediments with unsupported Pb-210 are summarized and the progress in gamma-spectrometry of the unsupported Pb-210 is discussed. The main topics of these studies concern sediment samples preparation for gamma-spectrometry, measurement techniques and data analysis, as well as understanding of accumulation and sedimentation processes in lakes. The vertical distributions of artificial (Cs-137, Am-241, Pu-239) and natural radionuclides (K-40, Pb-210, Pb-214, Bi-214) as well as stable trace elements (Fe, Mn, Pb) in sediment cores from four Swiss lakes were used as examples for the interpretation, inter-comparison and validation of depth-age relations established by three 210Pb-based models (CF-CSR, CRS and SIT). The identification of turbidite layers and the influence of the turbidity flows on the accuracy of sediment dating is demonstrated. Time-dependent mass sedimentation rates in lakes Brienz, Thun, Biel and Lucerne are discussed and compared with published data.