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Lead-210 and Beryllium-7 fallout rates on the southeastern coast of Brazil |
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| Authors: | Sanders Christian J Smoak Joseph M Cable Peter H Patchineelam Sambasiva R Sanders Luciana M |
| Institution: | a Universidade Federal de Fluminense (UFF), Departamento de Geoquímica, Outeiro de Sao Joao Baptista s/n, Morro do Valonguinho Centro, Niterói, RJ, Brazil b University of South Florida (USF), Environmental Science, St. Petersburg, FL, USA c Tulane University, Department of Earth and Environmental Sciences, New Orleans, LA, USA d Istituto de Radioprotecao e Dosimetria (IRD), Rio de Janeiro 22780, Brazil |
| Abstract: | Total 210Pb and 7Be fallout rates were measured on the coastal region of Niteroi, Brazil. The monthly depositional flux of 210Pb and 7Be varied by a factor of 26, from 1.7 to 43.3 mBq cm−2 year−1 and ∼27, from 7.5 to 203.5 mBq cm−2 year−1, respectively. The relatively large oscillations in the depositional flux of 210Pb at this study site were likely due to variations in air mass sources, while the 7Be fluctuations may be driven by a combination of weather conditions. Local geology could support the periodic high fluxes of 210Pb from continental air masses, as shifting oceanic wind sources were affirmed by the uncorrelated 210Pb and 7Be fallout activities and 7Be/210Pb ratios. The 210Pb atmospheric deposition was found to be in agreement with local sediment inventories, an important consideration in geochemical studies that estimate sedimentation processes. |
| Keywords: | 210Pb 7Be Atmospheric Wind mass 210Pb sediment inventories |
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