Nuclear and isotopic approaches are widely used in the field of environmental science as powerful tools for mitigating and managing environmental issues. These approaches are employed to track the history of pollutants over time and identify their potential sources, which helps in establishing mitigation and remediation strategies. In blue carbon sciences, these approaches are indispensable. By applying radiometric dating, it becomes possible to track changes in carbon accumulation over time and to quantify carbon burial rates. This information is crucial for understanding the sequestration and storage capacities of blue carbon ecosystems, which, in turn, helps in restoration projects and management programs of coastal blue carbon ecosystems. In this sense, the present chapter reviews and analyzes the role of nuclear approaches in advancing knowledge in the field of blue carbon sciences.