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The average concentrations of radionuclides of rese rvoir and tap water in the Yaoundé area, with a pop ulation of 1.5 million inhabitants were estimated from measurement s of mean specific activity using a well calibrated Canberra NaI(Tl) detector system. Water samples were collected from reservoirs and taps during the dry and the rainy s easons respectively in December 2002 and July 2003. The radionuclides o bserved with regularity belonged to the decay serie s naturally occurring radionuclides headed by 238U and 232Th as well as the non-series nuclide 40K. The average specific activity values obtained for 40K, 226Ra and 228Ra, respectively were for reservoir water 70 ± 11 BqL-1 ; 8.7 ± 3.5 BqL-1 ; 0.6 ± 0.2 BqL-1 during the dry season, and 50 ± 9 BqL -1 ; 8.5 ± 3.7 BqL-1 ; 0.6 ± 0.2 BqL-1 during the rainy season and for tap water, we have respectively 111 ± 17 BqL -1 ; 11.4 ± 3.7 BqL-1 ; 1 ± 0.3 BqL-1 during the dry season, and 51 ± 10 BqL -1 ; 9 ± 3.5 BqL-1 ; 0.7 ± 0.2 BqL-1 during the rainy season. The annual effective dos e received by Yaoundé adult population as a result of ingestion of this drinking water is respectively 0.925 mSv for the reservoir water and 1.052 mSv for the tap water.

The annual effective dose due to natural radionuclides in the reservoir and tap water in Yaoundé area, Cameroon