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| Titel |
Predicting terrestrial ²²²Rn flux using gamma dose rate as a proxy |
| VerfasserIn |
T. Szegvary, M. C. Leuenberger, F. Conen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 7, no. 11 ; Nr. 7, no. 11 (2007-06-06), S.2789-2795 |
| Datensatznummer |
250005032
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| Publikation (Nr.) |
 copernicus.org/acp-7-2789-2007.pdf |
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| Zusammenfassung |
| 222Rn is commonly used as a natural tracer for validating climate
models. To improve such models a better source term for 222Rn than
currently used is necessary. The aim of this work is to establish a method
for mapping this source term by using a commonly measured proxy, the gamma
dose rate (GDR). Automatic monitoring of GDR has been networked in 25
European countries by the Institute for Environment and Sustainability at
the Joint Research Centre (JRC IES) in Ispra, Italy, using a common data
format. We carried out simultaneous measurements of 222Rn flux and
GDR at 63 locations in Switzerland, Germany, Finland and Hungary in order to
cover a wide range of GDR. Spatial variations in GDR resulted from different
radionuclide concentrations in soil forming minerals. A relatively stable
fraction (20%) of the total terrestrial GDR originates from the
238U decay series, of which 222Rn is a member. Accordingly,
spatial variation in terrestrial GDR was found to describe almost 60% of
the spatial variation in 222Rn flux. Furthermore, temporal variation in
GDR and 222Rn was found to be correlated. Increasing soil moisture
reduces gas diffusivity and the rate of 222Rn flux but it also
decreases GDR through increased shielding of photons. Prediction of
222Rn flux through GDR for individual measurement points is imprecise
but un-biased. Verification of larger scale prediction showed that estimates
of mean 222Rn fluxes were not significantly different from the measured
mean values. |
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