Hochschule Ravensburg-Weingarten, University of Applied Sciences, Doggenriedstr., D-88250 Weingarten, Germany.
Hochschule Ravensburg-Weingarten, University of Applied Sciences, Doggenriedstr., D-88250 Weingarten, Germany.
J Environ Radioact. 2015 Jul;145:78-94. doi: 10.1016/j.jenvrad.2015.03.028. Epub 2015 Apr 11.
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.
本文总结了用非支持（210）Pb 对湖泊沉积物进行测年的最重要问题，并讨论了非支持（210）Pb 的伽马谱测定法的进展。这些研究的主要课题涉及伽马谱测定法用沉积物样品制备、测量技术和数据分析，以及对湖泊中积累和沉积过程的理解。人工（137Cs、241Am、239Pu）和天然放射性核素（40K、210Pb、214Pb、214Bi）以及稳定微量元素（Fe、Mn、Pb）在瑞士四个湖泊的沉积物岩芯中的垂直分布被用作通过三种基于（210）Pb 的模型（CF-CSR、CRS 和 SIT）建立的深度-年龄关系的解释、比较和验证的实例。证明了浊积层的识别以及浊流对沉积测年精度的影响。讨论了布里恩茨、图恩、比尔和卢塞恩等湖泊的时变质量沉积速率，并与已发表的数据进行了比较。
