Uranium contents and associated effective doses in drinking water from Biscay (Spain)

The determnation of 234U and 238U content in drinking waters treated at four treatment plants supplying water to a set of municipalities located in northern Spain has given mean values of 1.14 mBq/L fr 234U and 0.8 mBq/L for 238U. These contents, taking into account the population supplied with water and its distribution in age intervals, have allowed the determination of the annual intake of both radionuclides as well as the mean committed dose due to the ingestion of these radionuclides for which a value of 0.081 μSv/person is obtained.