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Sorption–Diffusion Model of 137Cs Absorption by Bottom Deposits of Lakes in the Reconstruction of 137Cs Fallout to Water Basins

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Abstract

For 6 drainless lakes with average depths of ≤12 m, the fallout of 137Cs to water basins is reconstructed by using in calculation the sorption-diffusion model off radionuclide absorption by the bottom and the data of later (in years) monitoring of 137Cs. The model was used to calculate the concentration of 137Cs in water by the date of lake contamination, with the subsequent determination of the amount of 137Cs in the bulk of lake water. The manifold difference in the 137Cs fallout density to water basins (18–700 kBq/m2), time of 137Cs exposure, and dissimilar natural properties of lakes had no effect on the correction of estimating the 137Cs fallout: the calculated results agreed with the data on the content of 137Cs in coastal soils of water basins. By the dates of 137Cs monitoring in lake water (7, 16, 35 years after the contamination of a water basin) its amount in the water bulk did not exceed 0.18–6.6% of the amount fallen on the lake surface. The parameters of the 137Cs migration in the water–bottom system, the distribution (Kd) and diffusion (D) coefficient were 2000–4000 L/kg and 1.0–0.2 × 10–7 cm2/s, respectively. Silts as the main examples of the sorption properties of the water basin bottom determined for many years the contamination odd rainless lakes with 137Cs.

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Authors and Affiliations

  1. Arctic and Antarctic Research Institute, 199397, St. Petersburg, Russia

    N. A. Bakunov, D. Yu. Bol’shiyanov, S. A. Pravkin & A. S. Makarov

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  1. N. A. Bakunov
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  2. D. Yu. Bol’shiyanov
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  3. S. A. Pravkin
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  4. A. S. Makarov
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Correspondence to S. A. Pravkin.

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Bakunov, N.A., Bol’shiyanov, D.Y., Pravkin, S.A. et al. Sorption–Diffusion Model of 137Cs Absorption by Bottom Deposits of Lakes in the Reconstruction of 137Cs Fallout to Water Basins. Radiochemistry 62, 667–672 (2020). https://doi.org/10.1134/S1066362220050148

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