Radionuclide particles in ground level air in Sweden during 2015

Filtering of ground level air is performed continuously at six different locations in Sweden: Kiruna, Umeå, Gävle, Kista, Visby and Ljungbyhed. The filters are pressed into weekly samples and the contents of different radionuclides are measured by gamma spectroscopy. Precipitation is collected at four of the stations: Kiruna, Gävle, Kista and Ljungbyhed. The samples are ashed and the contents of radionuclides are measured. Weekly activity concentrations of 7Be and 137Cs during 2015 in air and precipitation are presented for the different stations. Other anthropogenic radionuclides detected are also presented. Slightly increased activity concentrations of 137Cs were detected in southern Sweden during 12-19 October, 2015. A summary of these measurements is presented in Appendix I.