ABSTRACT A radioactivity measurement was carried out in water sediments of Ajiwa Dam. The sediment samples were collected, prepared and analyzed using Atomic Absorption Spectrometry (AAS) for the activity concentration of Zn, Cd, Cr, Cu and Pb. The results obtained shows average activity of Cr (1.69x10-6Î¼g/L) and Zn (5.69x10-6Î¼g/L) show the higher concentration followed by Cu (5.25x10-7Î¼g/L) and Cd (7.50x10-8Î¼g/L). the concentration of metals recorded in this study were lower than USEPA guidelines for drinking water quality Zn (5000Î¼g/L), Cu (1300Î¼g/L), Cr (100Î¼g/L) and d (5Î¼g/L). However Pb was found below the detection limit throughout the samples. The levels of Exping observed in order Cr>Cd respectively, while Cu, Pb and Zn were not detected. The mean levels of HQing was found to be 1.79x10-3, this indicates that the value found to be below the unity HQing>1. The average CDI values for selected metals (Zn, Cu, Cr, and Cd) were 1.78x10-7, 1.65x10-8, 5.327x10-8 and 2.355x10-9respectively, therefore CDI indices for heavy metals in the study area were found in order; Zn>Cu.Cr.Cd. The gross alpha and beta radioactivity of water samples were measured using proportional counter. The result show that the values are lower than the permissible levels of 0.1 and 1.0Bq/L set by WHO. The range of the measured Alpha and Beta activity were found to be 1.24x10-2 to 2.12x10-1Bq/L and 1.96x10-2 to 8.65x10-1Bq/L. this indicate that the water in all the sampling sites is safe for farming, fishing and domestic application when compared with World Health Oganization values.