Title of article :
Uranium-series isotopes transport in surface, vadose and ground waters at San Marcos uranium bearing basin, Chihuahua, Mexico
Author/Authors :
Burillo Montْfar، نويسنده , , Juan Carlos and Reyes Cortés، نويسنده , , Manuel and Reyes Cortés، نويسنده , , Ignacio Alfonso and Espino Valdez، نويسنده , , Ma. Socorro and Hinojosa de la Garza، نويسنده , , Octavio Raْl and Nevلrez Ronquillo، نويسنده , , Diana Pamela and Herrera Peraza، نويسنده , , Eduardo and Renterيa Villalobos، نويسنده , , Marusia، نويسنده ,
Abstract :
In the U deposit area at San Marcos in Chihuahua, Mexico, hydrogeological and climatic conditions are very similar to the Nopal I, Peña Blanca U deposit, 50 km away. The physicochemical parameters and activity concentrations of several 238U-series isotopes have been determined in surface, vadose and ground waters at San Marcos. The application of some published models to activity ratios of these isotopes has allowed assessing the order of magnitude of transport parameters in the area. Resulting retardation factors in San Marcos area are Rf238 ≈ 250–14,000 for the unsaturated zone and ≈110–1100 for the saturated zone. The results confirm that the mobility of U in San Marcos is also similar to that of the Nopal I U deposit and this area can be considered as a natural analog of areas suitable for geologic repositories of high-level nuclear waste.
