Numerous studies have used naturally occurring Ra isotopes (223Ra, 224Ra, 226Ra, and 228Ra, with half-lives of 11.4 d, 3.7 d, 1600 y, and 5.8 y, respectively) to quantify water mass ages, coastal ocean mixing rates, and submarine groundwater discharge (SGD). Using Monte Carlo models, this study investigated how uncertainties in Ra isotope activities and the derived activity ratios (AR) arising ...

Uncontrolled disposal of oilfield produced water in the surrounding environment could lead to soil contamination by naturally occurring radioactive materials (NORM). Large volumes become highly contaminated with radium isotopes (226Ra and 228Ra). The concentration radionuclides 226Ra, 232Th 40K were determined using gamma ray spectrometry order assess radiological health hazards excess lifetime...

The aim of this study is to analyse the role natural radionuclides 226Ra, 228Ra, 40K and unsupported 210Pb (210Pbex), as erosion accumulation process tracers. For purpose, a complex system, including both characteristic dynamics closed beach those associated with open wave action, was studied. A 3-year monthly variation 210Pbex carried out at Las Canteras beach, on Island Gran Canaria (Spain), ...

O presente trabalho apresenta os resultados de Ra e Ra obtidos durante o 4 experimento de intercomparação referente à descarga submarina de água subterrânea (Submarine Groundwater Discharge, SGD) realizado em Ubatuba (SP), em novembro/2003. Este experimento visava testar, em um sistema de rochas cristalinas fraturadas, as diferentes metodologias existentes de determinação da SDG. Embora com obj...