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This work describes the implementation of experimental procedures for alpha spectrometry measurement of 238U, 234U and 230Th activities in silicates. The best experimental conditions were defined using 233U, 232U and 229Th radioactive tracers and simulating the usual conditions found in processing silicate samples. The chemical procedure consists of the following steps: radioactive tracer addition and adapted dissolution by acid digestion, U and Th pre-concentration by co-precipitation, element separation and purification by ion exchange chromatography and electrodeposition in stainless steel disks in order to evaluate its effectiveness. This procedure was applied to the Brazilian geological standards BB-1 (basalt) and GB-

revista brasileira de geofísica

Implantação da metodologia de espectrometria 'alfa' para a determinação de isótopos de U e Th em rochas ígneas: aplicação ao estudo do desequilíbrio radioativo na Ilha da Trindade