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Fallout of cesium-137 on a forest ecosystem in the vicinity of a nuclear fuel reprocessing plant.

Ablstract-Forest canopies intercepted airborne radionuclide-bearing particles released by a nuclear fuel reprocessing plant at the Savannah River Plant producing higher concentrations and accumulations of 137Cs, 238Pu and 2397240Pu in the forest floor litter and mineral soil. This impact resulted in 137Cs contents usually more than double that for the control samples not influenced by the plant release. The variations in accumulation and distribution patterns of 137Cs, 238Pu and 239*240Pu were caused by the apparent greater mobility of 137Cs in the soil profile and the time of deposition of the Pu isotopes. The use of 137Cs as an environmental analog for Pu appears questionable as indicated by inconsistent relationships in samples between 137Cs and 238Pu or 137Cs and 239*m0Pu. However, its use looks promising in situations elsewhere where erosional transport mechanism determines the mobility of these radionuclides.