Universidade Federal de Fluminense (UFF), Departamento de Geoquímica, Outeiro de Sao Joao Baptista s/n, Morro do Valonguinho Centro, Niterói, RJ, Brazil.
J Environ Radioact. 2011 Dec;102(12):1122-5. doi: 10.1016/j.jenvrad.2011.07.008.
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.
²¹⁰Pb 和 ⁷Be 沉降通量在巴西尼特罗伊（Niteroi）的沿海地区进行了测量。²¹⁰Pb 和 ⁷Be 的月沉积通量变化范围很大，相差 26 倍，分别为 1.7 至 43.3 mBq cm ⁻² 年 ⁻¹ 和 7.5 至 203.5 mBq cm ⁻² 年 ⁻¹。本研究地点 ²¹⁰Pb 沉积通量的相对较大波动可能是由于空气团源的变化所致，而 ⁷Be 的波动可能是由天气条件共同作用所致。当地的地质条件可能支持来自大陆空气团的 ²¹⁰Pb 周期性高通量，因为 ²¹⁰Pb 和 ⁷Be 沉降活动和 ⁷Be/²¹⁰Pb 比值的不相关证实了海洋风向的变化。²¹⁰Pb 的大气沉积与当地沉积物储量一致，这在估计沉积过程的地球化学研究中是一个重要的考虑因素。
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