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This study assesses the level of natural radioactivity due to radionuclides, 226 Ra, 232 Th and 40 K, in 28 tap water samples collected from 6 most populated townships of Abidjan by using gamma spectrometry method for analysis. The activity concentrations of 226 Ra, 232 Th and 40 K varied from < AMD to 0.82 Bq/L, < AMD to 0.73 Bq/L and 0.82 to 5.91 Bq/L, respectively, with mean values of 0.36±0.06 Bq/L, 0.11±0.04 Bq/L and 2.08±0.69 Bq/L respectively, measured from all the water samples studied. The annual effective doses due to the ingestion of the natural radionuclides measured in the samples ranged from 8.06 to 127.41 μSv/y with an average value of 39.62±11.62 μSv/y. This average calculated annual effective dose was found to be much lower than the guideline doses of 100 μSv/y and 290 μSv/y respectively recommended by WHO and UNSCEAR. Therefore no harmful effect is expected directly to the population by drinking this water.

research journal of environmental and earth sciences

Assessment of the Exposure to Natural Radioactivity to Public from the Consumption of Tap Drinking Water in the Six Most Populated Townships of the District of Abidjan