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AbstractA radioecological model, which is a system of linear differential equations describing the dynamics of the transport of  137 Cs and  131 I radionuclides along the food chain after their release into the atmosphere after the Chernobyl accident, was used to reconstruct “instrumental” data of the  131 I activities in the grass pastures in the central part of Mazovia. Four atmospheric models were used for the reconstruction: direct calculation, homogeneous cloud – inhomogeneous rainfall, inhomogeneous cloud – homogeneous rainfall, and a model with recalculation of the  137 Cs and  131 I activities in the atmosphere. The “instrumental” data were reconstructed based on data from direct measurements of the  131 I activity in lawn grass. It has been shown that the direct calculation and homogeneous cloud models lead to a better agreement of the calculated and reconstructed “instrumental” data than the inhomogeneous cloud model. The arithmetic mean ratio of the calculated and reconstructed “instrumental” data lie in a range of 0.84 to 0.95 for the direct calculation and homogeneous cloud models, and in a range of 1.7 to 3.0 for the inhomogeneous cloud model. The mean geometric deviation for all models is constant and equal to 1.7. Instrumental and reconstructed “instrumental” data show a significant decrease in the specific activity of  131 I in grass due to its wash-off by continuous rainfall, both during rainfall and after most of the deposition takes place. Due to this effect, the coefficient of the  131 I retention on grass in the form of the maximum activity ratio to the  137 Cs deposition density decreases from 34 to 1.4 m 2 /kg while it increases from 1 to 29 kBq/m 2  as the result of the rainfall growth from 0 to 40 mm.

nuclear energy and technology

﻿Radioecological modeling of the  131 I activity dynamics in the pasture vegetation of Mazovia in the year of the Chernobyl accident: Reconstruction, verification, reliability assessments

﻿Radioecological modeling of the 131 I activity dynamics in the pasture vegetation of Mazovia in the year of the Chernobyl accident: Reconstruction, verification, reliability assessments

Radioecological modeling of the 131 I activity dynamics in the pasture vegetation of Mazovia in the year of the Chernobyl accident: Reconstruction, verification, reliability assessments