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Specific activities of dissolved 226Ra isotope were measured and 226Ra isotope activities associated to suspended solids were estimated in ground waters drawn from two wells drilled in a fractured granitic aquifer of the Meridional Pluton, Morungaba Granitoids, eastern São Paulo State. The 226Ra isotope activities were measured in a nine month sampling sequence between March and December, 2003. The mean dissolved 226Ra specific activities were, respectively, (43.8 ± 7.2) mBq/L and (51.2 ± 8.8) mBq/L. None significant time dependent trends were observed. The 226Ra isotope contribution to the bone surface committed dose, associated with the ingestion of these waters, were calculated as, respectively, (0.0224 ± 0.0019) mSv/year and (0.0134 ± 0.0023) mSv/year . The contribution to the effective committed dose were calculate as (0.219 ± 0.040) mSv/year and (0.258 ± 0.044) mSv/year, respectively. The estimates of the activities of the 226Ra activities of the suspended solids in a liter of these waters varied between, 1 mBq/ L and 10 mBq/ L.

Atividades do 226Ra em águas subterrâneas extraídas de dois poços localizados no Plúton Meridional, Granitóides de Morungaba, SP