Volume 37, Number C1, February 2002ECORAD 2001: The Radioecology - Ecotoxicology of Continental and Estuatine Environments
|Page(s)||C1-717 - C1-721|
|Published online||25 March 2010|
90Sr and 137Cs in flood-plain soils of the Techa river
Institute of Plant and Animal Ecology of Ural Division of Russian Academy of Sciences, 8 Marta Street 202, 620219 Ekaterinburg, Russia
The Techa river was contaminated in 1949-1956 from the nuclear enterprise "MAYAK". The investigations were carried out in flood plain of the Techa river in 1992-1999. In the upper and middle parts of the river the basic contaminator is 137Cs; downstream - more active is 90Sr. Density of contamination of soils with 90Sr down the river changes from 600 to 200 kBq/m2, and that with 137Cs - from 2,000 to 80 kBq/m2. Radionuclides content in soils of the central part of the flood plain (30-40 m from the river-bed) also decreases further from the discharge point 1-2 orders. The Techa flood plain may be considered to be a source of secondary radioactive contamination of the water ecosystem. We evaluated the absorption stability and water migration of radionuclides in its soils under experimental conditions. The main quantity of 90Sr was in exchangeable (41-66 %) form. 137Cs was in firmly fixed form (80-98 %). The study of radionuclides distribution in the liquid fraction of the soil showed that the main part of 90Sr (84%) was found in gravitation moisture. 137Cs (97%) was in a less mobile form of moisture which was connected with soil by capillary and sorption powers.
© EDP Sciences, 2002
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