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| Titel |
Annual variations of ²²²Rn concentration in soils in Krakow, Poland |
| VerfasserIn |
Paulina Wach, Michal Bonczyk, Przemysław Wachniew, Zbigniew Gorczyca, Michal Gasiorek |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250032069
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| Zusammenfassung |
| Process of radon exhalation from the soil is controlled not only by a source term (content of
226Ra in the soil and its vertical distribution) but also by physical properties of the upper soil
layer (mineral structure, porosity, water content, permeability) and indirectly by
meteorological conditions.
Depth profiles of 222Rn concentrations at two field sites in Krakow with contrasting
lithology and different degrees of anthropogenic impact were investigated. Stainless steel
tubes with an internal diameter of 1 cm were used to pump soil air from the depths of
20, 30, 40, 60, 100 (or 120), 150 and 200 cm into the active volume of the RAD7
monitor. The analyzed profiles were used to derive soil flux of 222Rn. Soil 222Rn flux
measurements were performed at both sites also with the aid of chamber method.
In addition, regular measurements of soil temperature and volumetric moisture
content were performed at the same depth intervals at which air was sampled. Soil
profiles were sampled for the analyses of uranium series radoinuclides activities
and analyses of grain size distribution and other basic physicochemical properties.
The obtained radon activity in the soil air exhibit substantial temporal fluctuations
with highest values in spring and winter months. Changes in soil water content and
groundwater levels seem to be a major control on the observed seasonal variations. |
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