ISSN:
1432-0495
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Geologie und Paläontologie
Notizen:
Abstract In White Oak Creek watershed in eastern Tennessee, the radionuclides60Co,90Sr, and137Cs were retained by streambed gravels on different sites:60Co was associated with manganese in the hydrous oxide coatings on rocks and minerals;90Sr occurred primarily as an exchangeable cation although small amounts were held in a nonexchangeable form; and137Cs was held very selectively, presumably by illite in shale fragments composing the sediment. The distribution of radionuclides on sediments was size dependent: the 0.85–3.35 mm fine-gravel fraction was higher in radionuclide concentration than the sand fraction. An areal survey of radionuclide concentrations on streambed gravels from throughout the watershed, located numerous contamination sources. These radionuclide concentrations, when combined with both distribution coefficients of radionuclides between gravel and water and drainage area, were used to rank subsections of the watershed by their relative contribution to the overall contamination of the watershed. For90Sr, this ranking procedure agreed with the measured discharges of subsections of the watershed which are routinely monitored.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF02415764
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