Measurements and calculations of soil radon flux at 325 sites throughout Florida

Autor: Nielson, K. K., Holt, R. B., Rogers, V. C.
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Zdroj: Environment International. 1996 SUPPLEMENT 1, Vol. 22, pS471. 0p.
Abstrakt: Soil radon fluxes were measured at 882 individual locations on undeveloped lands throughout all 67 counties of Florida, and at 112 locations on developed lands in South Central Florida. The fluxes were log-normally distributed, with respective geometric means of 0.40 and 1.26 pCi m-2 s-1 and geometric standard deviations(GSDs) of 4.43 and 4.22. The fluxes were approximately proportional to local gamma my measurements, and were approximately inversely proportional to the square root of soil moisture. The measured fluxes were compared with fluxes calculated from regional soil properties. Overall biases were small, but uncertainties in predicting regional flux from individual measurements were large (GSD = 2.94). Analytical uncertainty amounted to only GSD = 1.07. The GSDs estimated among flux measurements over different spatial scales followed the relationship GSD = 1.5 A0.04, where A is the area (m2) represented by the measurements. When applied to the measured-calculated flux comparisons, this trend accounts for the observed variations in bias statistics. [ABSTRACT FROM AUTHOR]
Databáze: GreenFILE
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