Devices which produce radiation only by the use of radioactive material. Examples include balances, chemical reagents containing uranium and thorium, smoke detectors, and static eliminators
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}