Dantas, R. da C., Navoni, J.A., Ferreira, D. de M., Costa, T.F. da, Medeiros, S.R.B. de and Amaral, V.S. do 2017. <b&gt;Influence of natural radon and metal contamination on surface water quality from a Brazilian Semiarid Region. Acta Scientiarum. Biological Sciences. 39, 3 (Sep. 2017), 275-282. DOI:https://doi.org/10.4025/actascibiolsci.v39i3.27787.