Abstract: The present paper studies the indoor radon variations in two similar dwellings, one of them occupied and the other unoccupied, from the same residential building. In particular, the research study was carried out in two new dwellings in Madrid. Radon concentration and ambient parameters were measured three-hourly from 11 May to 12 December 2014. Solid state detectors, Radon Scout, were used for the radon monitoring. Simultaneously, two atmospheric variables were acquired from NOAA Air Research Laboratory. The results show that radon level is slightly higher in the unoccupied dwelling than in the other one. From the analysis developed in this study, it is found that a specific seasonal pattern exists in the indoor radon concentration. Besides, the anthropogenic influence is also analysed. Nearly periodical patterns could be observed in specific periods whether dwelling is occupied or not.

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