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The Bothnian Sea which is located between Finland and Sweden represents an important source of fresh water to the Baltic Sea. We here present new data on the radioactive isotope 129I species from water samples collected in December 2009 at different depths in the Bothnian Sea. Concentrations of 129I− (iodide) in the Bothnian Sea range from 14 × 108 to 32 × 108 atoms/L, while 129IO3− (iodate) concentrations...
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