The hydraulic exchanges between the main water reservoirs of the Moroccan Middle Atlas region measured by solid state nuclear track detectors

Uranium and thorium contents were evaluated in water samples collected from different sources of the piedmont of the Middle Atlas mountains by using t wo types of solid state nuclear track detectors (SSNTD). In addition, the r adon (Rn-222) and thoron (Rn-220) alpha -activities per unit volume of the water samples were also determined. The influence of the water flow rate an d altitude on the radon concentration of the water samples belonging to the piedmont of the Middle Atlas mountains was investigated. The hydraulic exc hanges between the Middle Atlas water reservoirs and the Turonian aquifer o f the neighbouring Tadla plain have been quantified. The results were compa red with data given in literature.