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  • 1 Universidade de São Paulo Centro de Energia Nuclear na Agricultura Caixa Postal 96 13400-970 Piracicaba, SP Brazil
  • 2 Delft University of Technology Interfaculty Reactor Institute Mekelweg 15 2629JB Delft The Netherlands
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Uranium mining activities at Poços de Caldas plateau, Brazil, generated huge amounts of sulfidic waste rocks which were dumped into piles around the mine pit, requiring control measures to minimize the environmental impact. In this work, the sampling and the homogenization of these waste rocks are studied and their elemental analysis by instrumental neutron activation analysis (INAA) using normal (about 200 mg) and large (about 2 kg) samples. The results obtained allowed us to conclude that the waste rocks are extremely heterogeneous requiring even larger quantities of sample for its characterization.