Radioactive 6 : Radioactivity is the spontaneous emission of ionizing radiation from the nucleus of an unstable atom. Radioisotopes lose particles and energy through this process
University of California, Riverside, Environmental Health & Safety, Radiation Glossary of Terms, CA, USA 2010. https://apps2.campusservices.harvard.edu/ehs/radia tion/glossary.shtml, (Rad Sfty, Prot and Cont - Amer) {501}
