- Conference date: 07–12 October 2007
- Location: Buzios, Rio de Janeiro (Brazil)
Radiation and Nuclear Safety Authority—STUK monitors the amount of airborne radioactivity with three aerosol samplers in Northern Finland. Naturally occurring radioactive nuclei and can be seen. A time series was constructed for both nuclei observed at Rovaniemi (lat 66,3° N long 25,4° E). The most consistent time series was found to be from Ivalo (lat 68,64° N long 27,57° E). The time series of and were compared and the ratio was plotted. A time series analysis was performed for Ivalo time series to find periodicities. Two periodicities longer than one year was found 4,3 years and 11 years, also 3 periodicities shorter than one years was found 1,7 months, 4 months and 6 months. The annual average activities at Rovaniemi and Ivalo were also compared with the annual galactic cosmic ray intensity observed with neutron monitor at Oulu (65.05°N, 25.47°E) by Sodankylä Geophysical Observatory.
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