Measuring of 222Rn gas concentration and mapping in Al-Najaf soil samples Salar Hussein Ibrahem, Hussam Muhsin Hwail, Areej Saeed Abd Ulshaheed, Ali Abid Abojassim and Lubna A. Alasadi E3S Web Conf., 592 (2024) 06021 Published online: 20 November 2024 DOI: 10.1051/e3sconf/202459206021