Abstract
Uranium isotopes (235U and 238U) occur at variable in concentration in groundwater. These isotopes can be used as tracers of the groundwater sources and recharge conditions. In addition, relatively high amounts of uranium in groundwater may constitute health hazards. We have investigated here the distribution of uranium isotopes in groundwater collected from active wells along a transect between Al Ain and Dubai in the UAE. The results indicate wide range of concertation and suggest some correlation between TDS of the groundwater and distribution of the isotopes. More 235U and 238U are correlated with high TDS values. Among the many factors that control the distribution pattern of the isotopes, effects of lithology, distance from recharge front and seawater intrusion seem significant. Compared to the WHO permissible limit for drinking water, only some wells show concentrations higher than the suggested limit.
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