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- The concentration of 137Cs, the particle size, and the contents of TOC, H, N and S were measured for sediments collected in the adjacent sea to Yangnam, Korea. The concentrations of 137Cs in sediments are in the range of <MDA-7.19 Bq/kg-dry and linearly correlated with particle size and TOC, H and N contents in sediment. The distribution coefficients of 137Cs for sediments strongly depend on particle size and TOC content of sediments. The results of multiple regression analysis suggest that humic substances may have great influence on the deposition of 137Cs in sediment.