Ground radon spatio- temporal variability evaluation Tom Hlsny, Martin Polka, Frantiek urec, Elena Krtka Purpose To analyse ground radon short and middle term temporal variability on the bases of long-term monitoringTo analyse ground radon short and middle term temporal variability on the bases of long-term monitoring Radon An overview General characteristicsGeneral characteristics SourcesSources Impact on human healthImpact on human health The methods Field data gatheringField data gathering Sampling design Data gathering and processing AnalysesAnalyses Standard time series analyses descriptive characteristics Trend surface analyses Geostatistical analyses Case study Research areaResearch area Case study Sampling designSampling design Case study - source data desription 1841 measurement arranged in 49 time series1841 measurement arranged in 49 time series n = 1841 Mean = St. dev. =31.34 Min. = 1.27 Max =199.78 Case study derived characteristics =avg 2 nd diff =acc. index TS1 st diff 2 nd diff Case study derived characteristics N = 49 Mean = St. dev.= Min.= Max= 0.46 Case study Trend surface analysis Case study Geostatistical analysis N = 49 Mean = St. dev.= Min.= Max= 0.46 Case study Model classification Conclusion Analytically proved and quantified ground radon short\middle term temporal variabilityAnalytically proved and quantified ground radon short\middle term temporal variability No significant trend in acceleration index spatial distributionNo significant trend in acceleration index spatial distribution Data positively autocorrelated up to 300 metersData positively autocorrelated up to 300 meters Appropriate measures for practice were derivedAppropriate measures for practice were derived