URANIUM ISOTOPES IN SURFACE WATERS FROM SOUTHERN AFRICA

被引：37

作者：

KRONFELD, J ^{[1
]}

VOGEL, JC ^{[1
]}

机构：

[1] CSIR,EMA,QUATERNARY DATING LAB,PRETORIA 0001,SOUTH AFRICA

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 1991年 / 105卷 / 1-3期

关键词：

D O I：

10.1016/0012-821X(91)90130-A

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The U-234/U-238 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.

引用

页码：191 / 195

页数：5

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