Abstract
A two-group plant uptake experiment was conducted in which sagebrush seedlings ( Artemisia tridentata) were grown in pots containing soil spiked with 226Ra. The objective was to determine the effect of soil tracer amendment configuration on the uptake of 226Ra as determined by the concentration in leaves. The soil in all pots was spiked to contain the same total radioactivity. In one group, the radioactivity was distributed uniformly in the soil. In the other group, the activity was injected into the soil along a narrow vertical line, the site of injection being chosen randomly. The mean 226Ra leaf concentration from each group was 0.8 kBq/kg; however, the coefficient of variation of the leaf concentration from uniformly contaminated soil was 30% as compared to 84% for uptake from injected soil. It was concluded from statistical hypothesis testing that the mean leaf concentration was indistinguishable for the two groups.
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