[1] Univ Fed Rio de Janeiro, Nucl Engn Program, Rio De Janeiro, RJ, Brazil
[2] Univ Fed Bahia, Phys Inst, Earth & Environm Phys Dept, Salvador, BA, Brazil
[3] Univ Fed Bahia, Postgrad Program Geochem Petr & Environm POSPETRO, Salvador, BA, Brazil
[4] Inst Radioprotect & Dosimetry, Rio De Janeiro, RJ, Brazil
[5] Geol Survey Brazil, Rio De Janeiro, Brazil
[6] Univ Fed Rio de Janeiro, Polytech Sch, Rio De Janeiro, Brazil