radioactive « Back to Glossary IndexThe process of atoms breaking down randomly and spontaneously. Synonyms: radioactivityRelated Articles: Glossary: beta decayGlossary: parent isotopeGlossary: daughter isotopeGlossary: alpha decayGlossary: decay chain« Back to Glossary Index Author: Chris Associate Professor, Salt Lake Community College, Salt Lake City, Utah View all posts by Chris