Transport and Fate of Radionuclides in the Ob River Estuarine System.
STATE UNIV OF NEW YORK AT STONY BROOK MARINE SCIENCES RESEARCH CENTER
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This report describes results of field and laboratory studies focusing on the Ob River system. Analyses of suspended particles collected in 1994 in the fresh water portion of the system show the presence of radionuclides In, Np237 derived from nuclear fuel reprocessing. Measurements of I129 in dissolved 0.2 um colloidal 1000 NMW - 0.2 um and truly dissolved 1000 NMW fractions of river water shows that colloidal I129 represents 4-6 of the dissolved fraction in the Ob and 20 in the Taz River. Both dissolved I129 and dissolved organic carbon concentrations decrease towards the Kara Sea, possibly due to colloidal aggregation. Estimates of the I129 flux to the Kara Sea range from 0.3 - 1x1024 atomsy. This is equivalent to 0.1 - 0.6y of the total I129 emitted from La Hague and Sellafield over 23 years. Laboratory measurements of radionuclide distribution coefficients Kd show that Kds decrease in the order AmCoCsI, with values ranging from 2x105 for Am to 100 for I. The Kds for Am are strongly affected by the presence of DOC in the Ob River, with two orders of magnitude lower values in the presence of DOC.
- Water Pollution and Control
- Radiation Pollution and Control