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. The activity concentrations of 238 , 239 , 240 Pu and 241Am (fordetermining its mother nuclide, 241Pu ) as well as activity ratios of 238 Pu / 239 + 240 Pu , 241 Pu / 239 + 240 Pu and 239 + 240 Pu / 137 Cs and the mass ratio of 240Pu∕239Pu weredetermined from air filter samples collected in Rovaniemi (Finnish Lapland)in 1965 to 2011. The origin of plutonium in surface air was assessed based onthese data from long time series. The most important Pu sources in thesurface air of Rovaniemi were atmospheric nuclear-weapon testing in the1950s and 1960s, later nuclear tests in 1973–1980 and the SNAP-9Asatellite accident in 1964, whereas the influence from the 1986 Chernobylaccident was only minor. Contrary to the alpha-emitting Pu isotopes, 241Pu from the Fukushima accident in 2011 was detected in Rovaniemi.Dispersion modeling results with the SILAM (System for Integrated modeLling of Atmospheric composition) model indicate that Pucontamination in northern Finland due to hypothetical reactor accidentswould be negligible in the case of a floating reactor in the Shtokmannatural gas field and relatively low in the case of an intended nuclearpower plant in western Finland.

Measurements and modeling of airborne plutonium in Subarctic Finland between 1965 and 2011