[Redistribution of radionuclides on a landscape testing site for the period after the accident at the ChNPP [Chernobyl Nuclear Power Plant]]
1996
Perepelyatnikova, L.V. | Shevchenko, A.L. | Prister, B.S. | Omel'yanenko, N.P. | Charny, D.V. | Shmatok, V.I. | Grytsyuk, N.P.
The knowledge of landscape-geochemical distribution of elements makes it possible to explain laws of the change of parameters describing horizontal and vertical redistribution of 137 Cs which has taken place 9 years after the accident at the Chernobyl NPP. In independent landscapes the activity of 137 Cs fractions increases with the decrease of their size, on the plots of accumulative formation and transit mainly large mineral fractions have maximum specific activity. The activity of 137 Cs in liquid drain from the the platforms of runoff on "Kopachy" site in 1995 varied from 2,1 to 25,5 Bq/l, solid sediments contained thousand shares of percent from initial content of 137 Cs in soil. In comparison with 1987 the 137 Cs activity in liquid drain has decreased by 3-5 orders of magnitude, solid - by 2 orders, activity of wind sediments - by 3-10 times. In 1995 the activity of 137 Cs in ground waters was 2,3-5,8 times lower and that of 90 Sr - up to 46 times lower than in waters of lysimeters. Among the processes of radionuclides resuspension vertical migration and transport by flows of surface and ground waters prevail
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