Fundamental Concepts -- Radioactivity in Nature -- Radioelements and Radioisotopes and Their Atomic Masses -- Other Physical Properties of Nuclei -- The Nuclear Force and Nuclear Structure -- Decay Modes -- Radioactive Decay Kinetics -- Nuclear Radiation -- Measurement of Nuclear Radiation -- Statistical Considerations in Radioactivity Measurements -- Techniques in Nuclear Chemistry -- Nuclear Reactions -- Chemical Effects of Nuclear Transmutations -- Influence of Chemical Bonding on Nuclear Properties -- Nuclear Energy, Nuclear Reactors, Nuclear Fuel, and Fuel Cycles -- Sources of Nuclear Bombarding Particles -- Radioelements -- Radionuclides in Geo- and Cosmochemistry -- Dating by Nuclear Methods -- Radioanalysis -- Radionuclides in the Life Sciences -- Radionuclides in the Geosphere and the Biosphere -- Dosimetry and Radiation Protection.