Actinides Alkali metals C-14 Carbon Cesium Coastal environment Cores Cs-137 Delta National Wildlife Refuge Ebro Delta Elevation Everglades National Park Geologic hazards Isotope ratios Isotopes Lead Measurement Metals Natural hazards Northeastern Australia Northeastern Spain Pb-210 Plutonium Processes Pu-240/Pu-239 Quantitative analysis Radioactive isotopes Review Sea-level changes Soils