Abstract
Sediments collected from tidal saltmarsh areas in South Australia have been analysed for natural radionuclides from the uranium and thorium decay series. The concentrations observed indicate a significant enhancement of some nuclides in comparison to inland soils, consistent with the recent incorporation of uranium, thorium and actinium into the sediments. The probable source of the nuclides is sea-water. It has been experimentally established that the organic residues from the decay of vegetable matter play a major role in this process.
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