Material containing radioactive isotopes that give off radiation as they decay. A report of IAEA defines: "radioactive material shall mean any material having a specific activity greater than 70 Becquerel/kg"
European Commission, Directorate-General Home Affairs, Directorate A: Internal security, Unit A1: Crisis management Terrorism, CBRN Glossary, Brussels,Belgium, 2014. http://ec.europa.eu/dgs/home-affairs/what-we-do/po licies/crisis-and-terrorism/securing-dangerous-mat erial/docs/cbrn_glossary_en.pdf, (DPrepCBRN - Amer) {1022}