Radiation environment of radon gas concentrations in serum samples of human workers in factories at Al-Najaf Governorate, IraqMurtadha Ali Abd Almhdi, Mohsin Kadhim Muttaleb Al Jnaby and Nidhal Mohammed O. Al ShareefiE3S Web Conf., 719 (2026) 06011DOI: https://doi.org/10.1051/e3sconf/202671906011