Retardation of 238 U and 232 Th decay chain radionuclides in Long Island and Connecticut aquifers

Details Retardation of 238 U and 232 Th decay chain radionuclides in Long Island and Connecticut aquifers Retardation of 238 U and 232 Th decay chain radionuclides in Long Island and Connecticut aquifers

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57..597c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 3, pp.597-603

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Scientific paper

Knowledge of the ability of an aquifer to retard the groundwater transport of toxic or radioactive ions can be inferred from the analysis of groundwater for the radionuclides of the 238 U- and 232 Th-decay chains. Groundwaters of varying chemical composition were analyzed from wells in Long Island, New York, and Connecticut. Aquifer lithologies are arkose, quartz sandstone, granite, and glacial drift. Adsorption ( k 1 ) and desorption ( k 2 ) coefficients for Ra and Pb were calculated using 222 Rn activity as a measure of the supply of other -recoil nuclides. Laboratory tests of the validity of this assumption were made by measuring the flux of 224 Ra and 222 Rn from aquifer solids. The ratio k 1 / k 2 is the distribution coefficient, K , which is effectively equal to R f , the retardation factor. The average value of K for Ra is 6 × 10 2 in Long Island aquifers and 5 × 10 4 in Connecticut. The distribution coefficient for Pb is 10 4 in Long Island and 10 5 in Connecticut. Results from this and other studies reveal a strong dependence of retardation on pH, f O 2 , and ionic strength that tends to overwhelm any dependence of retardation on lithology.

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