Evaluation of mercury levels in sediment and soil samples from Vila Nova river basin, in Amapa state, Brazil, using radiochemical neutron activation analysis - Gonçalves, C.; Fávaro, Deborah Inês Teixeira; Melfi, Adolpho José; Oliveira, Sonia Maria Barros de; Vasconcellos, M. B. A.; Fostier, Anne Helene; Guimarães, J. R. D.; Boulet, Renné Georges Leon; Forti, Maria Cristina (Journal of Radioanalytical and Nuclear Chemistry, 2000)