Abstract
Nearshore surface sediments from various locations of the West Coast of India were leached by saturated ammonium carbonate solution for the extraction of uranium isotopes. The reagent chosen was found to have high efficiency for leaching uranium isotopes without attacking the mineral core of the sediment particle. The activity ratios of234U/238U are in the range of 1.11 to 1.14 and the activity ratios of235U/235U are in the range of 0.045 to 0.047. The respective activity ratios in leachates, and residues after removal of surface organic matter from the sediment particles by treatment with hydrogen peroxide and 0.05M HCl, revealed disequilibrium between238U and234U only in the surface organic matter. The activity ratios of234U/238U and235U/238U have also been determined in some seawater samples from the Arabian Sea.
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