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Radiation and Environmental Biophysics

, Volume 40, Issue 2, pp 115–123 | Cite as

Diurnal and seasonal variation of the equilibrium state between short-lived radon decay products and radon gas in ground-level air

  • R. Winkler
  • F. Ruckerbauer
  • M. Trautmannsheimer
  • J. Tschiersch
  • E. Karg
Original Paper

Abstract 

To study seasonal and diurnal variations and the effect of meteorological parameters, the equilibrium factor F (i.e. the ratio of equilibrium equivalent radon daughter concentration and radon gas concentration) was determined as a result of measurements on a test field at Munich-Neuherberg, Germany, continuously from October 1995 through March 1997. On average, F was found to be 0.62±0.09 (95% confidence level). The time series of F showed no distinct seasonal variations. Nevertheless, typical diurnal variations as well as seasonal variations of the diurnal behaviour were observed. Generally, F was found to be increased in the early afternoon, i.e. under conditions of enhanced vertical mixing in the atmosphere. The daily differences between high and low values of F depended on the season. On average, low F values were characteristic for days with precipitation and high wind speed, i.e. under turbulent atmospheric conditions. Therefore, taking daily mean values into account, F was found to be positively correlated with the aerosol concentration, although a relationship between the diurnal behaviour of the aerosol concentration and that of F was not detectable.

Keywords

Seasonal Variation Diurnal Variation High Wind Speed Aerosol Concentration Early Afternoon 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • R. Winkler
    • 1
  • F. Ruckerbauer
    • 1
  • M. Trautmannsheimer
    • 1
  • J. Tschiersch
    • 1
  • E. Karg
    • 2
  1. 1.GSF–National Research Center for Environment and Health, Institute of Radiation Protection, 85764 Neuherberg, Germany e-mail: rwinkler@gsf.de Tel.: +49-89-31872381, Fax: +49-89-31873323DE
  2. 2.GSF–National Research Center for Environment and Health, Institute of Inhalation Biology, 85764 Neuherberg, GermanyDE

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