Radioactive fallout 137Cs can be used to date sediment deposited in lakes and reservoirs since 1959. Within small regional watersheds, fallout 137Cs is assumed to be uniformly distributed on the surface soil and is tightly adsorbed to surface soil particles. Some of these soil particles naturally labeled with 137Cs then move through the sedimentation cycle and can be used to date sediment profiles. Two distinct periods of erosion and sedimentation (1959–1960 and 1963–1964) can be associated with periods of maximum atmospheric fallout. Data from other reservoirs illustrate the utility of this method.
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C. et al. (1973) studied this question.
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