Natural radionuclides in radium-rich soils in North-East Estonia
2005; Elsevier BV; Linguagem: Inglês
10.1016/s1569-4860(04)07015-9
ISSN1569-4860
Autores Tópico(s)Geochemistry and Geologic Mapping
ResumoThis chapter reports the recent results on the geographical and depth distributions of natural radionuclides analyzed in soil profiles collected in the Lääne-Virumaa and Ida-Virumaa Counties, NE Estonia, in 1998–2001. In the coastal regions of NE Estonia, the areas of high radium soil content are rather limited and neighbor “normal radium” areas. Maximum 226Ra concentrations in these distinct areas show the tendency to increase toward the east. While sampling sites cover a wide range of soil types, two different soil “groups” according to their 232Th/226Ra activity concentration ratio have been identified: in radium-rich soils the ratio varies in the range of 0.18 to 0.5 and in “normal” soils from 0.5 to 1. Preliminary estimations have shown a notable nonequilibrium between the concentrations of 238U and 226Ra in radium-rich soils.
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