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Studies on ground water samples from selected boreholes and wells in Idah were carried out to determine the concentration of radon ( 222 Rn) using the Liquid Scintillation Counter (LSC). The average concentration of radon obtained was 14.09±1.10 BqL -1 for boreholes and 13.45±1.00 BqL -1 for well waters. The overall average concentration of 13.77±1.05 BqL -1 was recorded. The results obtained in this work were compared with the maximum contamination level (MCL) of 11.1 BqL -1 set by USEPA and the world average value of 10.0 BqL -1 for drinking water and it was observed that 80% of the samples exceeded these values. The average annual effective dose by ingestion of 0.051mSvy -1 was recorded for boreholes and 0.049mSvy -1 for well water samples. All values of effective dose were below the ICRP recommended intervention level of 310mSvy -1 .

STUDIES ON RADON CONCENTRATION IN UNDERGROUND WATER OF IDAH, NIGERIA