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Radionuclide Transport above a Near-Surface Water Table

III. Soil Migration and Crop Uptake of Three Gamma-Emitting Radionuclides, 1990 to 1993

^a T.H. Huxley School of Environment, Earth Science and Engineering, Berkshire, SL5 7PY, United Kingdom
^b Department of Biology, Imperial College of Science, Technology and Medicine, Silwood Park, Ascot, Berkshire, SL5 7PY, United Kingdom

View larger version (36K): [in a new window]   Fig. 1. (a) Cumulative water fluxes across the bases of deep and shallow lysimeters during the period 1990–1993. (b) Rainfall and evapotranspiration from deep and shallow lysimeters during the period 1990–1993 (absolute amounts per quarter).

View larger version (23K): [in a new window]   Fig. 2a. Vertical distributions of activity concentrations of 22Na in deep and shallow lysimeters during the period 1990–1993.

View larger version (24K): [in a new window]   Fig. 2b. Vertical distributions of activity concentrations of 137Cs in deep and shallow lysimeters during the period 1990–1993.

View larger version (24K): [in a new window]   Fig. 2c. Vertical distributions of activity concentrations of 60Co in deep and shallow lysimeters during the period 1990–1993.

View larger version (18K): [in a new window]   Fig. 3. Soil–plant inventory ratios of (a) 22Na, (b) 137Cs, and (c) 60Co in deep and shallow lysimeters from 1990 to 1993.

View larger version (20K): [in a new window]   Fig. 4. Vertical distributions of winter wheat root densities in deep and shallow lysimeters averaged over a period of 6 wk prior to harvest in 1990–1993.

View larger version (16K): [in a new window]   Fig. 5. Weighted mean activity concentrations for (a) 22Na, (b) 137Cs, and (c) 60Co in deep and shallow lysimeters during the period 1990–1993.

View larger version (19K): [in a new window]   Fig. 6. Vertical distributions of soil redox potentials (49 measurements made fortnightly between August 1992 and July 1994) in one deep (a) and one shallow lysimeter (b). The solid line in each plot represents the means of all measurements while the dotted lines represent the maximum and minimum values recorded.