1. SUMÁRIO MINERAL 1999. Ministério de Minas e Energia – Departamento Nacional de Produção Mineral (DNPM) 1999; V.14 (ISSN 0101 2053).
2. Anuário Mineral Brasileiro. Ministério de Minas e Energia – Departamento Nacional de Produção Mineral (DNPM); 2001. p. 199.
3. UNSCEAR – United Scientific Committee on the Effects of Atomic Radiation. Ionizing radiation: sources and biological effects. New York: United Nations; 1982.
4. Radioactivity in the atmospheric effluents of power plants that use fossil fuels;Eisenbud;Science,1964
5. UNSCEAR – United Nations Scientific Committee on the Effects of Atomic Radiation. Sources and effects of ionizing radiation. New York: United Nation; 1993.