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U-ages in soils and groundwater evidencing wet periods 400-600 kyr ago in southeast Brazil
(Elsevier B.V., 2007-07-01)
U-238 and its radiogenic daughter U-234 have been utilized for dating soil formation and groundwater residence time during the last 1.5 million years, in this case based on the U-clissolution/precipitation occurring during ...
The U-isotopes modeling in aquifers from Pocos de Caldas plateau, Brazil
(Springer, 2005-08-01)
U-modeled groundwater residence times were estimated by changes in U-234/U-238 activity ratio (AR) and U content of groundwaters from Pocos de Caldas city situated at the Pocos de Caldas alkaline massif, Brazil. The estimated ...
Dissolved uranium, radium and radon evolution in the Continental Intercalaire aquifer, Algeria and Tunisia
(Elsevier B.V., 2014-11-01)
Natural, dissolved U-238-series radionuclides (U, Ra-226, Rn-222) and activity ratios (A.R.s: U-234/U-238; Ra-228/Ra-226) in Continental Intercalaire (Cl) groundwaters and limited samples from the overlying Complexe Terminal ...
Hydro(radio)chemical relationships in the giant Guarani aquifer, Brazil
(Elsevier B.V., 2014)
Especiação de urânio em águas tratada de drenagem ácida de mina usando a técnica de difusão em filmes finos por gradiente de concentração (DGT)
(Universidade Estadual Paulista (UNESP), 2016)
A comparative study of aquifer systems occurring at the Paraná sedimentary basin, Brazil: U-isotopes contribution
(2013-01-01)
The radioactivity due to 238U and 234U in three aquifer systems occurring within the Paraná sedimentary basin, South America, has been investigated. Uranium is much less dissolved from fractured igneous rocks than from the ...