Radioactivity: Introduction and Early History provides an introduction to radioactivity from natural and artificial sources on earth and radiation of cosmic origins. This book answers many questions for the layperson, student, teacher, and even practitioner as to the origins, properties, detection and measurement, and applications of radioactivity. Written at a level that most laypersons can appreciate, it includes many calculations that students and teachers may use in class work. Radioactivity: Introduction and Early History also serves as a refresher for experienced practitioners wh