HEAVY METALS AND MAN-INDUCED RADIONUCLIDE ¹³⁷Cs IN THE BOTTOM DEPOSITS OF LAKE TELETSKOE Available to Purchase

Five sections of bottom deposits were sampled up to a depth of 0.9 m in two profiles situated in the northwestern part of Lake Teletskoe. Partioning of ¹³⁷Cs, U (Ra equiv.), Th, Cd, Be, Pb, Cu, Zn, Mn, Cr, Ni, Co, Sb, and Hg has been investigated by gamma-spectroscopy and atomic absorption in deposit columns subdivided into 3 cm intervals as well as in soils, litter, and mosses from the adjacent areas. Both laterally and vertically, all the trace elements are distributed in an irregular way. Some of them (¹³⁷Cs, Pb, Hg, Cd, Mn) are typically accumulated in bottom deposits in the uppermost horizon, but only radioactive cesium and, to a degree, mercury are certainly of man-induced origin; for the rest of the elements of this group the man-induced nature of pollution of the upper horizons of the deposits is doubtful.