Uranium isotopes in surface waters from southern Africa

Details Uranium isotopes in surface waters from southern Africa Uranium isotopes in surface waters from southern Africa

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.105..191k&link_type=abstract

Earth and Planetary Science Letters, Volume 105, Issue 1-3, p. 191-195.

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Scientific paper

The 234U/238U activity ratio in river water in southern Africa is generally higher than that reported for rivers in other regions of the world. This is interpreted as due to the prevailing environmental conditions: in this warm dry region mechanical weathering predominates over chemical weathering, causing the isotope activity ratio of leached uranium to be, on average, 2.03 +/- 0.42 as compared to a ratio of 1.20 for river water in the more humid tropical and temperate regions. The isotopic composition of leachable uranium from river sediment is similar to that in the water. Rivers draining the Witwatersrand gold and uranium mining area clearly show pollution inputs characterised by high uranium content and low activity ratios.

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