Nuclear chemistry represents a vital fi eld of basic and applied research. This Volume 1 Nuclear- and Radiochemistry: Introduction describes the relevant parameters of stable and unstable atomic nuclei, the various modes of radioactive transformations, the corresponding types of radiation, and fi nally the mechanisms of nuclear reactions. The 2nd edition has updated the chapters throughout with additional material. The reader is also referred to the new edition of Volume 2 Nuclear- and Radiochemistry: Modern Applications.