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This research objective was to assess the level of randon-222 concentration in well water of the metropolitan region of Curitiba, Paraná.Current work presents the results of indoor 222 Rn activity ground water samples from artesian wells from aquifers of the region. The studies of radon activity in water were performed using the radon detector for a construction project is implemented. In this case, it is observed that the radon concentrations decrease about 56% in the first water tank and 83% in the second water tank over the well. This fact shows that the actions for mitigation of radon are viable and do not require major modifications to the usual systems of construction.

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