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Radionuclide Transport Above a Near-Surface Water Table

IV. Soil Migration and Crop Uptake of Chlorine-36 and Technetium-99, 1990 to 1993

^a Department of Environmental Science and Technology, Imperial College London, Silwood Park Campus, Ascot, Berkshire, SL5 7PY, UK
^b Department of Biological Sciences, Faculty of Life Sciences, Imperial College London, Silwood Park Campus, Ascot, Berkshire, SL5 7PY, UK

View larger version (22K): [in a new window]   Fig. 1. Vertical distributions of 36Cl activity concentrations in (A) shallow and (B) deep lysimeters from 1990 to 1993. The soil surface is located 40 and 70 cm above the geotextile material in the shallow and deep lysimeters, respectively.

View larger version (22K): [in a new window]   Fig. 2. Vertical distributions of 99Tc activity concentrations in (A) shallow and (B) deep lysimeters from 1990 to 1993. The soil surface is located 40 and 70 cm above the geotextile material in the shallow and deep lysimeters, respectively.

View larger version (16K): [in a new window]   Fig. 3. Weighted mean activity concentrations of (A) 36Cl and (B) 99Tc in shallow and deep lysimeters from 1990 to 1993.

View larger version (16K): [in a new window]   Fig. 4. Soil-to-plant inventory ratios of (A) 36Cl and (B) 99Tc in shallow and deep lysimeters from 1990 to 1993.

View larger version (21K): [in a new window]   Fig. 5. Plots of the percentage of soil redox (Eh) measurements (49 measurements made fortnightly between August 1992 and July 1994) to fall below 150 mV, the approximate redox potential at which TcVII is likely to be reduced to TcIV at soil pH values of between 6 and 8. The vertical lines represent water table depths in shallow and deep lysimeters (35 and 65 cm, respectively).