Abstract
Laboratory time-scale experiments were conducted on gravels from the Carnmenellis granite, Cornwall, England, with the purpose of evaluating the release of natural uranium isotopes to the water phase. The implications of these results for the production of enhanced 234U/ 238U activity ratios in Cornish groundwaters are discussed. It is suggested that the 234U/ 238U lab data can be used to interpret activity ratios from Cornwall, even when the observed inverse relationship between dissolved U and 234U/ 238U in leachates/etchates is taken into account.
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