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The Distribution of ^239,240Pu, ²³⁸Pu, and ¹³⁷Cs in Various Particle Size Classes of Lake Michigan Sediments¹

ABSTRACT

The distribution of ²³⁸Pu, ^239,240Pu, and ¹³⁷Cs was determined in sediment samples from Lake Michigan which had been separated into various particle size classes by an elutriation technique. Within the range of size classes studied the distribution of these isotopes are not a function of particle size, but rather have a constant concentration. In addition, calculations of ratios of ^239,240Pu and ¹³⁷Cs concentrations on particles to their concentration in the overlying water showed: (i) the ratios are similar for both plutonium and cesium (10⁵); and (ii) ratios do not vary with particle size for either element.

Key Words: transuranic elements • fresh water • nuclear technology

¹ Contribution from the Savannah River Ecol. Lab., Inst. of Ecol., Univ. of Georgia, P.O. Drawer E, Aiken, SC 29801. This research was supported in part by contract EY 76-C-09-0819 between the Univ. of Georgia and the U.S. Dep. of Energy. Work was performed in part at Argonne Natl. Lab., Argonne, IL 60439.

² Present address: Associate Research. Ecologist, Savannah River Ecol. Lab.; and Assistant Professor, Dep. of Forestry, Univ. of Kentucky, Lexington, KY 40506, respectively.

Received for publication December 8, 1977.