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Atmospheric 222 Rn was monitored from December 2008 to November 2010 on Rishiri Island (45°07′N, 141°12′E), northernmost Japan. Seasonal 222 Rn variation was characterized by high concentrations from November to February and low concentrations from May to July, caused by the alternation of continental and maritime fetch regions. 222 Rn tracer and back trajectory cluster analyses...
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