Computer Science
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54...29m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 1, pp.29-35
Computer Science
1
Scientific paper
The distribution of Sellafield-derived 239,240 pu and 241 Am in sediments and interstitial water of the north-east Irish Sea has been studied in order to examine the post-depositional-behaviour and to assess the potential for remobilization of the two radionuclides. The solid phase profiles of 239,240 Pu and 241 Am have major subsurface peaks which are not related to the distribution of organic carbon, Fe, or Mn, but may reflect the history of discharge from Sellafield. The interstitial water profiles of reduced Pu and Am also show major subsurface peaks which are not related to the diagenetic processes of organic matter oxidation by oxygen or nitrate, nor to the remobilization of Fe and Mn. The interstitial water radionuclide profiles show a qualitative relationship with the solid phase radionuclide profiles and this suggests an adsorption/desorption process described by apparent K d 's in the range of (1.7-11.8) × 10 5 for reduced Pu and (3.5-8.9) × 10 5 for reduced Am. However, systematic variations of this measured apparent K d with depth for Pu (and possibly Am) suggest that the sediment/interstitial water system is not at equilibrium. Available data do not support the suggestion that dissolved organic carbon is responsible for complexing Pu in the interstitial water. Scavenging of Pu and Am by precipitating oxide phases near the sediment surface is suggested.
Harvey Bruce R.
Kershaw P. J.
Lovett M. B.
Malcolm S. J.
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