Physics
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1287h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Issue 9, pp.1287-1291
Physics
3
Scientific paper
The concentrations of 238 U, 234 Th, 226 Ra, 222 Rn and 210 Pb and 234 U / 238 U activity ratios have been measured in several groundwater samples from Gujarat, India. In the aqueous phase the abundances of 234 Th and 210 Pb are grossly deficient relative to their parents, 238 U and 222 Rn respectively. The deficiency is ascribable to the impact adsorption of 234 Th and 210 Pb atoms onto particle surfaces which are very abundant in the groundwater regimes. The scavenging residence times for both these nuclides is about a day, suggesting that irreversible removal of `reactive' metals and pollutants in groundwaters can occur on very short time scales. The fast removal of 234 Th onto particles necessitates that in these groundwaters 234 U `excess' has to originate through leaching of soil grains rather than through in situ decay of dissolved 234 Th in the water.
Hussain Najid
Krishnaswami S.
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