224Ra, 228Ra, and 226Ra in Winyah Bay and Delaware Bay

Details 224Ra, 228Ra, and 226Ra in Winyah Bay and Delaware Bay 224Ra, 228Ra, and 226Ra in Winyah Bay and Delaware Bay

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..64..430e&link_type=abstract

Earth and Planetary Science Letters, Volume 64, Issue 3, p. 430-436.

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Scientific paper

The first 224Ra (t1/2 = 3.64 days) measurements from mixing zones of estuarine systems are presented for the Pee Dee River-Winyah Bay and Delaware Bay Estuaries. High-resolution gamma-ray spectrometry was used to determine 224Ra, 228Ra (t1/2 = 5.7 years), and 226Ra (t1/2 = 1622 years) activity ratios. Desorption and diffusion from suspended and bottom sediments contributes to the non-conservative increases of the three isotopes in each systems. In Delaware Bay 224Ra concentrations were nearly constant over the 2.5‰ to 15‰ salinity range where two turbidity maximum zones are located. 228Th scavenging onto the suspended particles in the turbid zones may supply a regenerative source of 224Ra in this system. Samples collected on the ebb and flood tide from a salt marsh along Delaware Bay have a 5-fold increase in 224Ra from flood to ebb and 3- and 2-fold increases for 228Ra and 226Ra respectively, indicating salt marshes are another source of radium to estuarine waters.

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