Radioactive materials left over from the production or use of special nuclear material. the tailings or wastes produced by the extraction or concentration of uranium or thorium from any ore processed primarily for its source material content
U.S. Environmental Protection Agency, Radiation Glossary, Office of Radiation and Indoor Air Radiation Protection Division, Washington, DC, USA 2013. http://www.epa.gov/radiation/glossary/index.html#a , (Dzstr/ Rad Emr - Amer) {823}