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Air filter samples collected at Sodankylä (67º22´ N, 26º39´ E) were analyzed to determine concentrations of  137 Cs and  90 Sr in surface air in northern Finland in 1963. Previously, activity concentrations of Pu isotopes have been determined from the same filters. Activity concentrations of  137 Cs and  90 Sr in surface air were &lt;50 μBq/m 3 –13800 ± 2700 μBq/m 3  and &lt;10 μBq/m 3 –5340 ± 290 μBq/m 3 , respectively. Air concentrations of  137 Cs and  90 Sr varied seasonally with a maximum in spring due to the springtime enhanced transportation of air masses with radioactive aerosols from the stratosphere to the troposphere. Activity ratios  90 Sr/ 239+240 Pu and  90 Sr/ 137 Cs were 6.9 ± 0.8–75 ± 5 and 0.08 ± 0.03–1.46 ± 0.51, respectively. The median value for the  90 Sr/ 137 Cs ratio (0.508) indicates contamination from global nuclear test fallout. An air mass back trajectory analysis suggests that no direct transport of radioactivity from the Novaya Zemlya test site to northern Finland occurred in 1963.

Total beta activity, 137 Cs and 90 Sr in surface air in northern Finland in 1963