Deuterium Carbon Isotopes Carbon-14 Elemental Composition Lithium Isotopes Isotopic Analyses Hydrogen Isotopes Nitrogen Isotopes Oxygen Isotopes Magnesium Isotopes Diet Analysis Sulphur Isotopes Sulfur Isotopes Zinc Isotopes Hydrogen Atoms Radioactive Isotopes Organic Chemistry Deuterium-Hydrogen Ratio Potassium Isotopes Promethium-147 Heavy Water Geographical Fingerprint Actinium-227