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We measured the time-series variations in 222Rn activity at a fixed station in the Yeongsan River Estuary (YRE), Korea, where the upstream water is obstructed by an artificial dam, during November 18–24, 2008, and conducted a horizontal 222Rn survey in the Seomjin River Estuary (SRE), Korea, during December 16–18, 2008. In the YRE, we observed constantly low levels of 222Rn activity over the sampling...
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