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Atoms for Peace Securing Better Future for All Nuclear Techniques for Global Development and Environmental Protection WATER IS ESSENTIAL FOR DEVELOPMENT

The goal of the IAEA is to aid Member States in assessing and managing all aspects of their water resources, to ensure their secure and equitable use into the future. Isotopes provide unique information about water characteristics in a cost efficient, accurate and easy-to-use way. Isotopes are water’s ‘fingerprints’ and are used to gain information about the age, origin and renewal rate of groundwater, its dynamics, as well as vulnerability to sources of pollution, salt water intrusion and climate change. During evaporation and condensation of water within the water cycle, the concentrations of oxygen and hydrogen isotopes — naturally occurring atoms of different mass — change, allowing distinct identification of water in differing environments. There are other isotopes in rainwater, such as tritium and 14C, the concentration of which decreases with time.