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

Salminen-Paatero, Susanna; Vira, Julius; Paatero, Jussi

The activity concentrations of inline-formula M1inlinescrollmathml chem normal 238 , normal 239 , normal 240 normal Pu 60pt13ptsvg-formulamathimgfa24a193ad74e65309ada2b051d68284 acp-20-5759-2020-ie00001.svg60pt13ptacp-20-5759-2020-ie00001.png and inline-formula241Am (for determining its mother nuclide, inline-formula241Pu) as well as activity ratios of inline-formula M4inlinescrollmathml chem normal 238 normal Pu / normal 239 + normal 240 normal Pu 81pt15ptsvg-formulamathimge97e6d2398ea548b125fe701f8e8747b acp-20-5759-2020-ie00002.svg81pt15ptacp-20-5759-2020-ie00002.png , inline-formula M5inlinescrollmathml chem normal 241 normal Pu / normal 239 + normal 240 normal Pu 81pt15ptsvg-formulamathimgf8d4ffba7366ea79ed58356de21a9890 acp-20-5759-2020-ie00003.svg81pt15ptacp-20-5759-2020-ie00003.png and inline-formula M6inlinescrollmathml chem normal 239 + normal 240 normal Pu / normal 137 normal Cs 81pt15ptsvg-formulamathimgf10b7df6415a805276bf42df3e18c303 acp-20-5759-2020-ie00004.svg81pt15ptacp-20-5759-2020-ie00004.png and the mass ratio of inline-formula240Pu∕239Pu were determined from air filter samples collected in Rovaniemi (Finnish Lapland) in 1965 to 2011. The origin of plutonium in surface air was assessed based on these data from long time series. The most important Pu sources in the surface air of Rovaniemi were atmospheric nuclear-weapon testing in the 1950s and 1960s, later nuclear tests in 1973–1980 and the SNAP-9A satellite accident in 1964, whereas the influence from the 1986 Chernobyl accident was only minor. Contrary to the alpha-emitting Pu isotopes, inline-formula241Pu 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 Pu contamination in northern Finland due to hypothetical reactor accidents would be negligible in the case of a floating reactor in the Shtokman natural gas field and relatively low in the case of an intended nuclear power plant in western Finland.

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Salminen-Paatero, Susanna / Vira, Julius / Paatero, Jussi: Measurements and modeling of airborne plutonium in Subarctic Finland between 1965 and 2011. 2020. Copernicus Publications.

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Rechteinhaber: Susanna Salminen-Paatero et al.

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