Physics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.1107s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 5, pp.1107-1114
Physics
7
Scientific paper
The collection of large volumes of pore water (1-2 liters per 2 cm horizon of sediment) and low level radiochemical measurements of 239,240 Pu and 137 Cs have been combined to produce the first study of these fallout artificial radionuclides in marine pore waters. Profiles from box cores taken in June and September 1982 from Buzzards Bay, Mass., are reported along with profiles of many diagenetic constituents ( i.e . SO 4 2- , alkalinity, Fe, Mn, DOC, and nutrients). The 239,240 Pu pore water profile is characterized by a subsurface maximum of about 0.28 dpm/100 kg lying between 3-11 cm. Overlying seawater, in contrast, has an activity of 0.01 ± 0.02 dpm/100 kg. Below about 11 cm, the pore water 239,240 Pu distribution follows that of the solid phase which decreases rapidly with depth. The pore water profiles of 137 Cs are characterized by a broad and deeply penetrating maximum where activities of about 35-40 dpm/100 kg extend from 3 to 20 cm. Overlying seawater, in contrast, has an activity of 17-24 dpm/100 kg. The 137 Cs and 239,240 Pu pore water data show that there is preferential downward transport of 137 Cs and that 239,240 Pu does not have an active diagenetic chemistry and is not significantly mobile in these coastal sediments.
Mann Don R.
Sholkovitz Edward R.
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