Diurnal and Seasonal Variations of Concentration and Size Distribution of Nano Aerosols (10-1100 Nm) Enclosing Radon Decay Products in the Postojna Cave, Slovenia

Radiat Prot Dosimetry. 2012 Nov;152(1-3):174-8. doi: 10.1093/rpd/ncs218. Epub 2012 Aug 23.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aerosols
  • Air Pollutants, Radioactive / analysis*
  • Air Pollution, Indoor / analysis
  • Caves
  • Particle Size
  • Radiation Monitoring / methods*
  • Radon / analysis*
  • Radon Daughters / analysis
  • Seasons
  • Slovenia
  • Temperature
  • Time Factors


  • Aerosols
  • Air Pollutants, Radioactive
  • Radon Daughters
  • Radon