کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1877013 1042038 2008 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
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
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
پیش نمایش صفحه اول مقاله
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
چکیده انگلیسی
Activity concentrations of dissolved 234U, 238U, 226Ra and 228Ra were determined in ground waters from two deep wells drilled in Morungaba Granitoids (Southern Brazil). Sampling was done monthly for little longer than 1 year. Significant disequilibrium between 238U, 234U and 226Ra were observed in all samples. The variation of 238U and 234U activity concentrations and 234U/238U activity ratios is related to seasonal changes. Although the distance between the two wells is short (about 900 m), systematic differences of activity concentrations of U isotopes, as well as of 234U/238U, 226Ra/234U and 228Ra/226Ra 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Radiation and Isotopes - Volume 66, Issue 10, October 2008, Pages 1531-1542
نویسندگان
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