dc.creator | REYES, Erika | |
dc.creator | MARQUES, Leila S. | |
dc.date.accessioned | 2012-10-20T02:18:34Z | |
dc.date.accessioned | 2018-07-04T15:30:34Z | |
dc.date.available | 2012-10-20T02:18:34Z | |
dc.date.available | 2018-07-04T15:30:34Z | |
dc.date.created | 2012-10-20T02:18:34Z | |
dc.date.issued | 2008 | |
dc.identifier | APPLIED RADIATION AND ISOTOPES, v.66, n.10, p.1531-1542, 2008 | |
dc.identifier | 0969-8043 | |
dc.identifier | http://producao.usp.br/handle/BDPI/27161 | |
dc.identifier | 10.1016/j.apradiso.2008.04.003 | |
dc.identifier | http://dx.doi.org/10.1016/j.apradiso.2008.04.003 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1623811 | |
dc.description.abstract | Activity concentrations of dissolved U-234, U-238, Ra-226 and Ra-228 were determined in ground waters fromtwo deep wells drilled in Morungaba Granitoids (Southern Brazil). Sampling was done monthly for little longer than 1 year. Significant disequilibrium between U-238, U-234 and Ra-226 were observed in all samples. The variation of U-238 and U-234 activity concentrations and U-234/U-238 activity ratios is related to seasonal changes. Although the distance between the two wells is short (about 900m), systematic differences of activity concentrations of U isotopes, as well as of U-234/U-238, Ra-226/U-234 and Ra-228/Ra-226 activity ratios were noticed, indicating distinct host rock-water interactions. Slightly acidic ground water percolation through heterogeneous host rock, associated with different recharge processes, may explain uranium and radium isotope behavior. (c) 2008 Elsevier Ltd. All rights reserved. | |
dc.language | eng | |
dc.publisher | PERGAMON-ELSEVIER SCIENCE LTD | |
dc.relation | Applied Radiation and Isotopes | |
dc.rights | Copyright PERGAMON-ELSEVIER SCIENCE LTD | |
dc.rights | restrictedAccess | |
dc.subject | uranium | |
dc.subject | radium | |
dc.subject | ground waters | |
dc.subject | alpha spectrometry | |
dc.subject | gamma-ray spectrometry | |
dc.subject | fractured aquifers | |
dc.title | Uranium series disequilibria in ground waters from a fractured bedrock aquifer (Morungaba Granitoids-Southern Brazil): Implications to the hydrochemical behavior of dissolved U and Ra | |
dc.type | Artículos de revistas | |