title: Diurnal and seasonal variations of concentration and size distribution of nano aerosols (10-1100 nm) enclosing radon decay products in the Postojna Cave, Slovenia.
abstract: At the lowest point along the tourist route in the Postojna Cave, the activity concentration of radon ((222)Rn) short-lived decay products and number concentration and size distribution of background aerosol particles in the size range of 10-1100 nm were measured. In the warm yearly season, aerosol concentration was low (52 cm(-3)) with 21 % particles smaller than 50 nm, while in the cold season, it was higher (1238 cm(-3)) with 8 % of <50 nm particles. Radon activity concentrations were 4489 and 1108 Bq m(-3), and fractions of unattached radon decay products were 0.62 and 0.13, respectively.
authors.affiliation: Department of Environmental Sciences,  JoŽef Stefan Institute, Jamova cesta 39, 1000 Ljubljana,  Slovenia.
authors.forename: M
authors.initials: M
authors.lastname: Bezek
authors.forename: A
authors.initials: A
authors.lastname: Gregoric
authors.forename: N
authors.initials: N
authors.lastname: Kávási
authors.forename: J
authors.initials: J
authors.lastname: Vaupotic
mesh_terms: D000336:Aerosols; D000396:Air Pollutants, Radioactive / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis; D059552:Caves; D010316:Particle Size; D011834:Radiation Monitoring / Q000379:methods*; D011886:Radon / Q000032:analysis*; D017687:Radon Daughters / Q000032:analysis; D012621:Seasons; D017524:Slovenia; D013696:Temperature; D013997:Time Factors
chemical_list: D000336:Aerosols; D000396:Air Pollutants, Radioactive; D017687:Radon Daughters; D011886:Radon