Physics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..48..239e&link_type=abstract
Earth and Planetary Science Letters, Volume 48, Issue 2, p. 239-249.
Physics
10
Scientific paper
Concentrations of dissolved 226Ra in Winyah Bay, South Carolina, and in the adjacent Atlantic Ocean are augmented by the desorption of radium from sediments in the low-salinity area of the estuary and diffusion from bottom sediments. Desorption of 226Ra is reflected by lower concentrations in suspended sediments from higher-salinity regions of the estuary. Bottom sediments from the high-salinity region have lower 226Ra/230Th activity ratios than those from the low-salinity end.
The shape of the dissolved 226Ra vs. salinity profile is influenced by the river discharge. During average-discharge conditions, desorption of 226Ra from suspended and bottom sediments increases the dissolved 226Ra concentrations by a factor of 3.5 as the water passes through Winyah Bay. High river discharge produces an initial increase of dissolved 226Ra by a factor of 2 to 3 and apparently reflects only desorption from suspended sediments. By driving the salt wedge down the estuary and reducing the zone of contact of salt water with bottom sediments, the high-flow conditions sharply reduce the flux of 226Ra from bottom sediments.
Elsinger Robert J.
Moore Willard S.
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