Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI

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Variation of Outdoor Radon Levels in Urban Areas of Cluj County. Some early work has considered the connection between atmospheric temperature differences, wind speed, relative humidity and radon concentration in outdoor air. A comprehensive evaluation of some possible environmental factors which could influence outdoor radon concentration is the subject of this study. Research is being conducted to measure outdoor radon concentrations in some urban areas of Cluj County and observe any correlations with atmospheric conditions. The outdoor radon measurements were performed using Radim 5 continuous radon monitor that allows the variation of radon concentrations based on air temperature. Monthly atmospheric temperature, humidity data and outdoor radon concentration are measured simultaneously in order to observe any cross correlations between variables with radon concentration. These results can be used by radon testers to determine when radon concentrations will be at their maximums or to help interpret data obtained under given conditions. A preliminary analysis of these results has shown that seasonal and diurnal variations, atmospheric temperature and relative humidity of outdoor air may bring some significance in the effects on radon concentration.

Keywords: radon concentration, outdoor air, seasonal variations, diurnal variations, meteorological factors.