Spatial distribution of radon-222 in outdoor areas of Kufa City, Al-Najaf Governorate, IraqAwsam Abdulsattar Marzaali and Ali Abid AbojassimEur. Phys. J. Plus, 141 7 (2026) 778DOI: https://doi.org/10.1140/epjp/s13360-026-08016-6