@misc{misc23426ec4, title = {High natural radiation in Brazilian sands}, author = {Silveira, Marcilei Aparecida Guazzelli da and Medina, N. H. and Pereira, B R and Aguiar, Vitor Ângelo Paulino de}, year = {2012}, publisher = {AIP}, booktitle = {Latin American Symposium on Nuclear Physics and Applications} }