Abstract
Most Pu from nuclear fallout is currently found in surface soils from which it is distributed by migration, resuspension and uptake by the roots of plants. This paper investigates the sites of localization of Pu in plants and examines which parameters determine its uptake. Different species of trees were studied, special attention being directed towards seasonal variations of Pu uptake in different parts of the plants. To differentiate between Pu adsorption and absorption, the plant parts were washed with CHCl 3. Most of the Pu was found in the bark, being adsorbed on the plant surface. Comparison of Pu concentrations in plants over several years shows a constant decrease similar to that observed in air.
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