Spatial Analysis of Radon Gas in Tap Water in the Old City of Najaf

This study evaluates radon gas concentrations in tap water across four neighborhoods in the Old City of Najaf, Iraq-Al-Huwaish, Al-Amara, Al-Barak, and Al-Mashraq-using spatial analysis and the RAD7 detection system.Water samples were collected and analyzed to determine the presence of radon, a naturally occurring radioactive gas with potential health risks.The results showed that radon concentrations in all studied areas were below the maximum permissible limit of 11 Bq/L, as set by international standards such as the WHO and IAEA.The highest average value was recorded in Al-Barak (5.4 Bq/L), while other districts had significantly lower averages.Slight variations in concentration levels were attributed to geological differences and the depth of water sources.This spatial assessment highlights the overall safety of the water supply in the Old City and underscores the importance of continuous monitoring, especially in historical urban settings with aging infrastructure.