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Materials and Methods: Surface seawater samples were collected quarterly from Guryongpo and Jangho in the East Coast between 1998 and 2010 and the quarterly deep seawater samples were collected from three sites in the sea adjacent to Ulleung-do between 2012 and 2015. The activity concentrations of 137Cs were measured using a gamma-spectrometer. The activity concentrations of 90Sr and 90Y in a radioactive equilibrium state were measured using a gas flow proportional counter.

Activity Concentrations of 137Cs and 90Sr in Seawaters of East Sea, Korea

Activity Concentrations of ¹³⁷Cs and ⁹⁰Sr in Seawaters of East Sea, Korea