Abstract
A detailed radiochemical procedure for alpha spectrometry measurements of uranium concentrations and of 234U/ 238U activity ratios in silicates is presented. The described chemical processing is characterized by relatively high uranium yields, in the range of 51–89%. The application of this chemical procedure to geological standards allowed estimating a reproducibility of the alpha spectrometry uranium measurements on the order of 3.5%. As an application example, the procedure was used in the analysis of quaternary volcanic rocks from the Trindade and Martin Vaz Islands, Brazil.
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