Full-scale investigations have demonstrated that radon contained in soil air provides dominant influence on the university’s radon field formation. The change of radon volume activity in the university’s civil defense hideout and premises have strongly pronounced seasonal pattern with maximum values of radon concentration in July and August, and minimum values in March, April and November. Radon escaping from the soil surface in the summertime does not affect the radon field change in the university’s premises. The most precise estimation of radon annual average volume activity can be obtained when performing observations during a year. The substitution of this approach by the method of measurements with various duration leads to errors in the estimation of the normative parameter because of difficulties in registration of radon variations in various conditions.

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Shows historical measurements of volumetric activity of radon in soil in the territory of the Far Eastern State Transport University, the results of measurements and analyses the nature of radon concentrations change depending on the time of year and meteorological parameters surrounding Wednesday, estimated radon danger in constructed buldings. Keywords: meteorological parameters surrounding Wednesday, volume activity of radon in soil air, radon danger in constructed buldings.