Enhancement of uranium 234 in springwaters of Águas da Prata, São Paulo, Brazil
Author:
- Daniel Marcos BonottoDBDaniel Marcos Bonotto
- 9 July 1993
- journal article
- Published by American Geophysical Union (AGU) in Water Resources Research
- Vol. 29 (7) , 2041-2048
Abstract
Springwater samples were collected at Águas da Prata, an important spa in Sāo Paulo State, Brazil. The 238U and 234U isotopes were evaluated for Platina, Paiol, Villela, Prata‐Radioativa, Prata‐Nova, Boi, Vitória, and Prata‐Antiga springs. An inverse logarithmic correlation was found between 234U/238U activity ratio and 222Rn content of the studied waters, which was related to different solution mechanisms of 222Rn and 234U nuclides at the rock‐water interface. A linear correlation also exists between the 234U/238U activity ratios of the studied waters and total dissolved solids, ionic strength, CO2 partial pressure, and index of base exchange, which indicates that the enhancement of 234U in solution increases with the degree of weathering in the aquifers. A higher 234U/238U activity ratio was found to be directly related to a higher value of dissolution rate.Keywords
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