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Quantities and fluxes of stable strontium and manganese were measured in a Puerto Rican tropical rain forest. These measurements were used to formulate a mathematical model of the dynamics of these elements. The model was then used to make predictions of the fate of the radioactive analogs of these isotopes after input via atmospheric fallout. The model was partially validated by measuring actual fallout levels in the forest during part of the time span covered by the model's predictions.
Jordan et al. (Tue,) studied this question.