کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1739351 1521633 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modeling 137Cs migration processes in lake sediments
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی هسته ای و مهندسی
پیش نمایش صفحه اول مقاله
Modeling 137Cs migration processes in lake sediments
چکیده انگلیسی

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 sedimentation–diffusion 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Environmental Radioactivity - Volume 96, Issues 1–3, July–September 2007, Pages 54–62
نویسندگان
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