The behaviour of short-lived radiogenic lead isotopes (214Pb and 212Pb) in groundwaters and laboratory leaching experiments

Details The behaviour of short-lived radiogenic lead isotopes (214Pb and 212Pb) in groundwaters and laboratory leaching experiments The behaviour of short-lived radiogenic lead isotopes (214Pb and 212Pb) in groundwaters and laboratory leaching experiments

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..58..430h&link_type=abstract

Earth and Planetary Science Letters, Volume 58, Issue 3, p. 430-438.

Computer Science

2

Scientific paper

The concentrations of 214Pb (half-life=26.4 minutes) and 22Rn (half-life=3.84 days) have been measured in deep groundwaters of Gujarat, India. The results show that the abundance of 214Pb in the water is only ~25% of that expected from its production through the radioactive decay of dissolved 222Rn. This deficiency if modelled in terms of a first-order removal, yields a residence time of ~10 minutes for 214Pb in these waters. The estimated residence time for 214Pb is the shortest observed for any nuclide in natural water systems and suggests that reactive nuclides lead like could be removed from aqueous phases to adjoining solid surfaces on extremely short time scales. Results of laboratory experiments using the 212Pb-224Ra pair are compatible with the observed fast removal of 214Pb from groundwaters.
Re-evaluation of 234Th residence times in these waters using a model with a recoil flux of 234Th into aqueous phase, the same as that of 222Rn, yields values in the range of 23 to <176 minutes, very similar to that of 214Pb. This ``concordancy'' in the residence times seems to suggest that the geochemical behaviour of 234Th and 214Pb in these waters is quite similar.

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