Testovani vlivu blizkosti tektonickych poruch nebo kontaktu hornin na objemovou aktivitu radonu v horninach na uzemi mesta Brna

Radon risk mapping data from the city Brno were collected from databases of six private companies. There was an information about radon activity concentration from 685 measured sites. The measured sites were divided into two groups, tectonic-influenced or contact-influenced or without tectonic or contact-influenced, with the use of geological maps at the scale 1 : 50 000. values of the third quartile of radon activity concentration from statistical sets of each site were testes for influence of tectonics or contacts. Three steps of testing were used for five select rocks (with more than 30 measured sites). Histograms of numbers of measured sites and values of the third quartile of radon activity concentration in areas with an without tectonic or contact-influenced in the same rock were compared. Values of median of the third quantile were compared too. Mann-Whitney statistical test was used for the values of the third quartile of radon activity concentration in both areas, with or without tectonics or contacts, for the same rock. Radon activity concentration was influenced (to higher values) by tectonics or contacts in fluvial sandy loam, calcareous clay and probably in the granodiorite of Královo Pole type. No influence of tectonics or contacts on the values of radon activity concentration was proved in dumps, loess and loess loam.