Ground water geochemistry of 228 Ra, 226 Ra and 222 Rn

Details Ground water geochemistry of 228 Ra, 226 Ra and 222 Rn Ground water geochemistry of 228 Ra, 226 Ra and 222 Rn

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.1173k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Issue 7, pp.1173-1182

Computer Science

4

Scientific paper

228 Ra, 226 Ra, and 222 Rn activities were determined on over 150 ground water samples collected from drilled, public water supply wells throughout South Carolina. A wide range of aquifer lithologies were sampled including the crystalline rocks of the Piedmont and sedimentary deposits of the Coastal Plain. A significant linear relationship between log 228 Ra and log 226 Ra ( n = 182, r = 0.83) was indistinguishable between Piedmont and Coastal Plain ground water. Median 228 Ra / 226 Ra activity ratios for the Piedmont, 1.2, and Coastal Plain, 1.3, ground water are close to estimated average crustal 232 Th / 238 U activity ratios of 1.2 to 1.5 corresponding to Th/U weight ratios of 3.5 to 4.5. A linear correlation was also found between log 222 Rn and log 226 Ra for Piedmont ( n = 68, r = 0.62) and Coastal Plain ( n = 89, r = 0.64) ground water. However, the median 222 Rn / 226 Ra activity ratio for Piedmont ground water, 6100, was much higher than for Coastal Plain ground water, 230. Higher excess 222 Rn activities may be due to greater retention of 226 Ra by the chemically active Piedmont aquifers compared to the more inert sand aquifers sampled in the Coastal Plain. The relationship between log 228 Ra and log 226 Ra was used to predict total Ra ( 228 Ra + 226 Ra ) distributions in Appalachian and Atlantic and Gulf Coastal Plain ground water. Predictions estimate that 2.4% of Appalachian and 5.3% of Atlantic and Gulf Coastal Plain ground water supplies contain total Ra activities in excess of the 5 pCi/l limit established by the U.S. Environmental Protection Agency. These predictions also indicate that 40-50% of these ground water wells may be overlooked using the presently suggested screening activity of 3.0 pCi/l of 226 Ra for 228 Ra analysis.

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