Variations of 210Pb concentrations in surface air at Thessaloniki, Greece (40°N)A. Ioannidou, E. Kotsopoulou, A. Karanatsiou and C. PapastefanouEPJ Web of Conferences, 24 (2012) 05003DOI: https://doi.org/10.1051/epjconf/20122405003