Over the past 30years, the rapid development of the Chinese economy resulted in environmental problems, especially in coastal areas. To discern the effects of anthropogenic activities, Pb and Cs were examined in the sediment from Daya Bay, northern South China Sea. The specific activity of Cs showed a clear maximum, corresponding to 1963. Pb specific activity varied from 25.1 to 78.5Bq kg. Pb distribution showed a hiatus at 18-19cm with 5-6cm of older sediment (>150years), indicating direct land-originating material over a short timescale rather than natural processes. This event was attributed to the human-induced redistribution of sediment during reclamation. Based on the Cs-labeled 1963 and Pb-chronologies, this event was confined to late 1977, earlier than the generally recognized significant anthropogenic activities. Thus, information archived in the sediment or in records prior to the 1970s would be better environmental background in Daya Bay.
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