Abstract
Localized high gamma activity was detected during an airborne radiometric survey over an area located within the Athabasca Basin, Saskatchewan. Follow-up surveys on the ground found three small lakes from which the activity, as well as high radon enamation, originated. Analyses were made of waters, Fe-Mn spring precipitates, and plant samples in and near the lakes for U, Ra, Pb, and Po nuclides. No significant U concentrations were found, however, 226Ra was highly concentrated in the precipitates from one lake. It is concluded that the high 226Ra concentrations are the result of the ability of Fe-Mn oxides to adsorb this nuclide from waters with normal abundances of 226Ra. Over a long period of time, sufficient concentrations of 226Ra have produced a non-significant (false) radiometric anomaly unrelated to mineralization.
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