COMPARATIVE ASSESSMENT OF NATURAL RADIONUCLIDE CONTENTS IN SOIL AND HOUSEHOLD WELL WATER COLLECTED FROM BIRNIN-GWARI LOCAL GOVERNMENT AREA OF KADUNA STATE NIGERIA
The assessment of natural radioactivity in soil and water sample from different point in Birnin-Gwari local Government area of Kaduna state, Nigeria was measured by means of gamma-ray spectrometer with NaI(Tl) detector to establish a baseline data for activity concentration of 40K, 226Ra and 232Th. It was found that, the mean activity concentration of 40K, 226Ra and 232Th in soil collected from different location (SI, S2, S3, S4, S5, S6 and S7) is (272.41±5.31, 25.61±1.89 and 77.53±2.08)Bg/kg, respectively is above the world average of 50 Bq/kg (UNSCEAR, 2000). While that in water was 0.4303±0.0219Bg/kg for α and 2.322x10^-3±0.0595Bg/kg for β. The maximum cancer risk was found in soil with a value of 13945.04msv/yrs having a highest percentage assessment of 34.78% than that of water with a value of 9.313msv/yr with lower percentage of 29.8%. Results from the fourteen field samples analysed also indicated that the activity concentration in percentage due to 40K in the soil samples ranked highest against the lowest value obtained for sediments in the water samples.