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Mechanisms of Thorium Migration in a Semiarid Soil

United States Army Corps of Engineers, ERDC, Environmental Laboratory, Vicksburg, MS 39180

View larger version (35K): [in a new window]   Fig. 1. Schematic of the electrokinetic experimental apparatus.

View larger version (22K): [in a new window]   Fig. 2. Thorium and uranium concentrations (µg/L) in column leach experiments over approximately 3 mo. (A) Column packed with thorium soil only. (B) Column packed with a layer of clean soil below the thorium soil.

View larger version (27K): [in a new window]   Fig. 3. Thorium and uranium concentrations in electrokinetic experiments over approximately 3 mo in Cell A. Weekly changing of cell fluids produces the observed cyclical increases.

View larger version (24K): [in a new window]   Fig. 4. Thorium and uranium concentrations in electrokinetic experiments over approximately 3 mo in Cell B. Weekly changing of cell fluids produces the observed cyclical increases.

View larger version (22K): [in a new window]   Fig. 5. Mass lost from soil sample after exposure to various weathering events and erosion by different wind speeds.