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CHARACTERISTICS OF RADIONUCLIDE‐CONTAMINATED SOILS FROM THE SEDAN CRATER AREA AT THE NEVADA TEST SITE1

The distribution of radionuclides in selected soil profiles and the characteristics of contaminated ejecta in the Sedan crater area (site of a nuclear excavation test conducted in 1962) were investigated in an attempt to define the physicochemical parameters controlling the redistribution of radionuclides required to assess the environmental and health hazards of the contaminated area. The results showed that concentrations of 239,240Pu, 241Am, 155Eu, 137Cs, 102mRh, 90Sr, and 60Co decreased with depth and with increasing distance from ground zero. The contaminated particles occurred as moderately porous calcium aluminosilicate glass, predominantly sand size (2–0.1 mm in diameter), in the loamy sand or sandy loam soil. Differences in distribution patterns and concentration ratios among the radionuclides indicated that a significant fraction of the 137Cs and 90Sr present in contaminated overburden materials had moved downward during the past 22 years, under arid environmental conditions, into the buried soil.