Abstract
Twenty samples of borehole and well water were taken from the Kaduna North Local Government Area of Kaduna,Kaduna state, Nigeria,in two litre plastic jerrycans.Two drops of concentrated nitric acid were to each container in order to preserve the samples. The total dissolved solids (TDS) were determined for the water samples. An aliquot of each sample was evaporatated to dryness,and transferred to a planchet. Based on the total dissolved solids (TDS) of the sample,the residue was counted for gross alpha and beta activity using the proportional counter. The results show that the counter has low background and good plateau, which were all reproducible: and for the counting modes, results show that alpha and beta activity concentrations range from (0.691.52)x10 -3 to (41.225.7)x10 -3 Bq/L: and from (28677.1)x10 -3 to (9506104)x10 -3 Bq/L respectively.The overall show that that the alpha activity in the study area is far below the practical screening level of radio activity in drinking water of 0.5Bq/L for alpha, as rcommended by CEC-FAO AND WHO.However,a full sixty percent of the samples show beta activity levels above the 1Bq/Las rcommended by CEC-FAO AND WHO.Radionuclide specific tests therefore indicated.
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