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Titel des Beitrags Dating of sediments of Lake Biel, Switzerland, with unsupported Pb-210: Problems and results
Titel veröffentlicht in ... Proceedings of the 3rd International Conference on Po and radioactive Pb isotopes
Erscheinungsjahr 2015 Seite (von - bis) 15 Publikations-Art Kongressschrift / Tagungsband Name der Konferenz/Veranstaltung 3rd International Conference on Po and radioactive Pb isotopes
Tagungsort Kusadasi Tagungsdatum 11.10.2015 Inland/Ausland Turkey Berichtsjahr 2015
Abstract : In 2013 sediment cores with a length of about one meter were taken from two different basins of Lake Biel. Lake Biel is a mesotrophic lake with the tributaries River Aare which comes from glacier regions in the Alps and the River Zihl which is the outflow of the neighboring Lake Neuchâtel. Upstream on the River Aare the nuclear power plant “Mühleberg” (boiling water reactor) is located.
The preparation of sediment samples and the sealing of samples against the diffusion of Rn-222 out of the sample is discussed and the Rn-loss is experimentally quantified. Total Pb-210, unsupported Pb-210 (via Pb-214 or Bi-214), Cs-137, Co-60, Be-7 and Am-241 in sediment samples were measured gamma-spectrometrically in order to establish a depth-age relation and to correlate it with independent time-markers. Pu-239/240 was determined via ICP-mass-spectrometry. Also, stable Pb, Fe, Mn, sediment bulk density, organic matter content and some naturally occurring radionuclides were determined.
For dating of sediment layers with unsupported Pb-210 the Constant Flux-Constant Sedimentation Rate (CF-CSR), Constant Rate Supply (CRS) and Sediment Isotope Tomography (SIT) models were applied and intercompared. Discrepancies between Pb-models and other time-markers as well as results on sedimentation rates and the influence of turbidite layers on Pb-210 vertical distribution and depth-age relations are discussed.
Einrichtungen Hochschule Ravensburg-Weingarten
Bachelorstudiengang Physikalische Technik
Fakultät Technologie und Management
Institut für Angewandte Forschung (IAF)
Schwerpunkt Energie und Umwelt (IAF)
Praxisamt Bachelorstudiengang Physikalische Technik
Bachelorstudiengang Energie- und Umwelttechnik
Beteiligte Personen Klemt , Eckehard Prof. Dr. rer. nat.
Projekte Radioökologische Studien und Untersuchungen
Wissenschaftliche Veröffentlichungen