Predictive modeling of radon concentration indoors: the case of marble wall cladding.

This study evaluates the potential health risk posed by radon (222Rn) emissions from the marble walls of a closed room. Six marble samples (three local and three imported), representing the most commonly used marble types, were selected for this study, were analyzed using gamma spectrometry to determine their radon emission rates. The estimated radon concentrations in a modeled room, based on typical regional dimensions and construction practices (a 14 m3 closed room with 2 cm thick marble walls) ranged from 2.68 to 20.867 Bq m-3, significantly below the International Commission on Radiological Protection safety limit of 300 Bq m-3. Only 0.15% of the total radon activity was emitted into the air, indicating minimal health impact. These findings confirm that the studied marbles are safe for unrestricted use in construction applications.