Lead-210 and Beryllium-7 fallout rates on the southeastern coast of Brazil.
J Environ Radioact
; 102(12): 1122-5, 2011 Dec.
Article
em En
| MEDLINE
| ID: mdl-21856052
ABSTRACT
Total ²¹°Pb and 7Be fallout rates were measured on the coastal region of Niteroi, Brazil. The monthly depositional flux of ²¹°Pb and 7Be varied by a factor of 26, from 1.7 to 43.3 mBq cm⻲ year⻹ and â¼27, from 7.5 to 203.5 mBq cm⻲ year⻹, respectively. The relatively large oscillations in the depositional flux of ²¹°Pb 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 ²¹°Pb from continental air masses, as shifting oceanic wind sources were affirmed by the uncorrelated ²¹°Pb and 7Be fallout activities and 7Be/²¹°Pb ratios. The ²¹°Pb atmospheric deposition was found to be in agreement with local sediment inventories, an important consideration in geochemical studies that estimate sedimentation processes.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cinza Radioativa
/
Radioisótopos
/
Berílio
/
Radioisótopos de Chumbo
País/Região como assunto:
America do sul
/
Brasil
Idioma:
En
Revista:
J Environ Radioact
Assunto da revista:
SAUDE AMBIENTAL
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Brasil