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The natural radioactivity found in natural water originates from dissolved radioactive elements (e.g. uranium), radioactive elements suspended in colloidal form (e.g. thorium), suspended radioactive elements (e.g. microcrystals of radioactive elements) and diffused radioactive elements (e.g. radon). Thus, the natural radioactivity in waters comes mainly from rocks and minerals in which water comes in contact (NIKEZIC & YU, 2004). Natural waters may be regarded as the main transport agent of radioactive elements under several geophysical and geochemical conditions (BONOTTO & LIMA,1997).

A Comparative Study of Methods for Determining the Concentration of Radon-222 in Spring Waters in Poços de Caldas Plateau, Brazil