Table 3 summarises the concentration results of radon and radium in the ground water samples collected from different drilled wells(tube wells).The recorded 222 Rn activities in 20 ground water samples were found to vary from 0.447+-0.07 to
4.167+-0.20 Bql 1 with an average value of1.4070.03 Bql 1 consequently the average annual effective dose for ingestion was found to be 9.977+-0.20 mSv y 1. The radium concentration was found to range from 0.087+-0.06 to 0.5470.12 Bql 1, with an
Average value of 0.187+-0.02 Bql 1 then the mean annual dose resulting directly from water intake was 36.667+-3.74 mSv y 1.
In ground water, findings suggested that the concentration of radium was consistently controlled by the geochemical properties of the aquifer systems, with the highest concentrations most likely to be present where, as a consequence of the geochemical environment, adsorption of the radium was slightly decreased The three water-chemistry groups defined by low pH, low dissolved oxygen(DO)concentrations, or by the combination of both factors were supported to explain the occurrence of elevated concentrations of radium in the ground water samples. This hypothesis was then confirmed by a study on the relationship between concentrations of 226Ra and pH for twenty ground water samples.