UPTAKE OF RADIONUCLIDES BY PLANTS
STANFORD RESEARCH INST MENLO PARK CA
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The uptake of five radionuclides Sr-85, Zr-Nb-95, Ru-106, Cs-137, and Ce-144 was measured for seven plants bean, carrot, clover, lettuce, radish, tomato, and wheat grown in three different soil types sand, loam, and clay. Plants were grown in large soil containers that allowed most of the root system to develop under normal field conditions. Sampling started as soon as the plants sprouted and continued at frequent intervals depending on growth characteristics of the plant. Plant uptake contamination factors a sub SU were calculated for each of the samples harvested. Comparisons of the uptake for various plant part-soil-radionuclide combinations at crop maturity show that the a sub SU values for Sr-85 are the largest in all instances, usually by an order of magnitude. The a sub SU value for the edible portion of each plant was lowest in every case, and usually the leafy portion of the plant had the largest a sub SU value.