ABSTRACT
In introducing the topic, it is expedient to start with a chemist's point of view in dealing with the phenomenon of radioactivity and various properties of radioactive matter. The concepts useful for the radiochemist are not necessarily those required by a nuclear physicist or a reactor engineer. Hence, the definitions and facts related to radioactivity will be treated in a comprehensive but partially unconventional approach within the objective of this book. Some aspects that are overlooked or that receive minor attention in classical treatises will require more detailed consideration when radioactivity is discussed from the chemist's standpoint.
