Abstract
Concentrations of 222 Rn were determined in selected thermal water samples of the northern region of Venezuela. Concentrations in the range of 1–560 Bq/l were found. Soil radon concentrations and air radon concentrations related to the high values of radon concentration in water were investigated in El Castaño and at a spa in Las Trincheras. An outstandingly high radon efflux was found in Las Trincheras with an average soil radon concentration of 122 kBq/m 3, and an air radon concentration of 54 kBq/m 3 in inhalation treatment pipes. Dose calculations revealed that regular consumption of the measured water samples presents an extra dose of radiation that may range up to 4 mSv/y.
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