Al-Enezy, A. , Al-Owaidi, M. and Hussein, M. 2023. Using isotopes for dating and residence time of groundwater in an aquifer, a case study at Al-Najaf, Middle Iraq: DOI:10.48129/kjs.17107. Kuwait Journal of Science. 50, 1B (Jan. 2023). DOI:https://doi.org/10.48129/kjs.17107.