@inproceedings{inproceedingsca7f4d53,
title   = {Natural radiation in the sands of the Brazilian regions with different rock formations},
author = {Silveira, M A and Medina, N H and Pereira, B R},
year = {2011},
publisher = {LASNPA},
booktitle   = {Latin American Symposium on Nuclear Physics and Applications}
}