| Records |
Author  |
Severi, A.; Masoudian, M.; Kordi, E.; Roettcher, K. |
| Title |
Discharge coefficient of combined-free over-under flow on a cylindrical weir-gate |
Type |
Journal Article |
| Year |
2015 |
Publication |
ISH Journal of Hydraulic Engineering |
Abbreviated Journal |
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| Volume |
21 |
Issue |
1 |
Pages |
42-52 |
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Taylor & Francis |
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THL @ christoph.kuells @ doi:10.1080/09715010.2014.939503 |
Serial |
88 |
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| Author |
Silva, M.L. da; Bonotto, D.M. |
| Title |
Uranium isotopes in groundwater occurring at Amazonas State, Brazil |
Type |
Journal Article |
| Year |
2015 |
Publication |
Applied Radiation and Isotopes |
Abbreviated Journal |
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| Volume |
97 |
Issue |
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Pages |
24-33 |
| Keywords |
Amazon area, Dissolved uranium, Groundwater, Tube wells, U/U activity ratio |
| Abstract |
This paper reports the behavior of the dissolved U-isotopes 238U and 234U in groundwater providing from 15 cities in Amazonas State, Brazil. The isotope dilution technique accompanied by alpha spectrometry were utilized for acquiring the U content and 234U/238U activity ratio (AR) data, 0.01–1.4µgL−1 and 1.0–3.5, respectively. These results suggest that the water is circulating in a reducing environment and leaching strata containing minerals with low uranium concentration. A tendency to increasing ARs values following the groundwater flow direction is identified in Manaus city. The AR also increases according to the SW–NE directions: Uarini→Tefé; Manacapuru→Manaus; Presidente Figueiredo→São Sebastião do Uatumã; and Boa Vista do Ramos→Parintins. Such trends are possibly related to several factors, among them the increasing acid character of the waters. The waters analyzed are used for human consumption and the highest dissolved U content is much lower than the maximum established by the World Health Organization. Therefore, in view of this radiological parameter they can be used for drinking purposes. |
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0969-8043 |
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no |
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THL @ christoph.kuells @ silva_uranium_2015 |
Serial |
140 |
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