This paper examines the results of R-mode factor analysis performed on four
radionuclides and two elements data from a geochemical survey from western
Turkey. Sediment and soil samples numbering 321 were collected along the G
ediz river and analysed for (238)eU, (232)eTh, K-40, Ra-226, Mg and Pb. Two
factors in soil and sediment, which account for 59% and 56% of the total v
ariance, respectively, were extracted and named as geological structure and
volcano. (C) 2001 Elsevier Science Ltd. All rights reserved.