Faculty Publications


Lead-210 and Beryllium-7 fallout rates on the southeastern coast of Brazil.

SelectedWorks Author Profiles:

Joseph M. Smoak

Document Type


Publication Date


Date Issued

January 2011

Date Available

January 2012


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.


Abstract only. Full-text article is available only through licensed access provided by the publisher. Published in Journal of Environmental Radioactivity, 102, 1122-1125. doi:10.1016/j.jenvrad.2011.07.008 Members of the USF System may access the full-text of the article through the authenticated link provided.




Elsevier Science Pub. Co.