title: Dating of sediments from four Swiss prealpine lakes with (210)Pb determined by gamma-spectrometry: progress and problems.
abstract: In this paper the most important problems in dating lake sediments with unsupported (210)Pb are summarized and the progress in gamma-spectrometry of the unsupported (210)Pb 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 ((137)Cs, (241)Am, (239)Pu) and natural radionuclides ((40)K, (210,214)Pb, (214)Bi) 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 (210)Pb-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.
authors: Hochschule Ravensburg-Weingarten, University of Applied Sciences, Doggenriedstr., D-88250 Weingarten, Germany. Electronic address: putyrskaya@hs-weingarten.de.
authors: V
authors: V
authors: Putyrskaya
authors: Hochschule Ravensburg-Weingarten, University of Applied Sciences, Doggenriedstr., D-88250 Weingarten, Germany.
authors: E
authors: E
authors: Klemt
authors: Federal Ofﬁce for Civil Protection, Spiez Laboratory, CH-3700, Switzerland.
authors: S
authors: S
authors: Röllin
authors: Federal Ofﬁce for Civil Protection, Spiez Laboratory, CH-3700, Switzerland.
authors: M
authors: M
authors: Astner
authors: Federal Ofﬁce for Civil Protection, Spiez Laboratory, CH-3700, Switzerland.
authors: H
authors: H
authors: Sahli
mesh_terms: D019015:Geologic Sediments / Q000032:analysis*; D060106:Lakes / Q000737:chemistry*; D007856:Lead Radioisotopes / Q000032:analysis*; D055110:Radiometric Dating / Q000379:methods*; D013051:Spectrometry, Gamma / Q000379:methods*; D013557:Switzerland; D014131:Trace Elements / Q000032:analysis
chemical_list: D007856:Lead Radioisotopes; D014131:Trace Elements
keywords: (137)Cs; (210)Pb; (222)Rn loss; Dating; Gamma-spectrometry; Lake sediments