  The primary motivation for this work is the evaluation of the radon
concentration in portable water for human consumption in Bibala, a municipality
in Angola, where granitic rocks are common, and contain a high concentration of
uranium that can be mobilized in underground water. Radon is the largest
contributor of radioactive pollution in underground water.Its concentration in
water, represents a public health risk due to the fact that the gas can easily
escape into the air, adding to the total indoor concentration of radon.On the
other hand, ingestion of water with a high radon concentration represents an
additional risk to the stomach. Measurements of radon concentration, in Bibala
municipality's water, were performed on 16 samples obtained from wells of
various depths and analyzed with DURRIDGEs' RAD7 equipment. Measured
concentrations are in the range from 39.5 to 202 Bq/L , with 2 of the recovered
samples presenting values over 100 Bq/L.
