Modeling Cs-137 migration processes in lake sediments. (Peer-Reviewed Article) - Detailansicht

Grunddaten

Titel der Arbeit (title)	Modeling Cs-137 migration processes in lake sediments.
Titel der Zeitschrift bzw. Zeitung	Journal of Environmental Radioactivity
Erscheinungsjahr	2007
Verlag (publisher)	Elsevier Science Ltd.
Seitenzahl (pages)	54-62
Band (volume)	Volume 96, Issues 1-3
Publikationsart	Peer-Reviewed Article

Inhalt
Abstract	Lake sediments can be considered as the diary of the lake: new layers are continuously deposited on top of the sediments. The migration behavior of radionuclides, particularly of 137Cs, can be analyzed by modeling the input into and the vertical distribution within the sediment. For this purpose, a model consisting of sedimentationdiffusion equations was developed. Solved with a finite element method, this model can cover the time period from the nuclear weapons testing to the present. It takes into account fixation and redissolution, compaction of sediments, and the influence of competing ions on the retarded diffusion within the sediments. The outcome of the model is compared to water and sediment measurements from Lago Maggiore. The results of an optimization process can produce the sedimentation rate and 137Cs distribution coefficients which determine the uptake of activity into the sediment and also the retarded diffusion within the sediment.