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The activities, fluxes and inventories of 210Pb and 137Cs in sediments collected from freshwater lakes, brackish-water lakes and seabeds in the East Asia are studied to elucidate their geochemical behaviors and characteristics concerning sedimentation environments. The surface concentrations varied widely by location. The average flux of excess 210Pb increased from freshwater lakes to brackish-water lakes to seawater, and the average flux of 137Cs showed an inverse trend. The inventories of excess 210Pb and 137Cs were in good correlation in samples from the same lake or adjacent areas. The inventory ratio (137Cs/excess 210Pb) was in the order of samples from seawater, increasing in brackish-water, further increasing in freshwater, and samples from Chinese lakes showed higher values. It is inferred that the inventory ratio may become a kind of index of sedimentation environment, geological, and/or radiochemical events.

Fluxes and inventories of 210Pb and 137Cs in lake sediments from East Asia and their relationships to sedimentary environment