(DoD, NATO) Material, such as plutonium and certain isotopes of uranium, which is capable of supporting a fission chain reaction.
Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.
| APA | Military Dictionary (DoD). (2011). active material. Retrieved September 21, 2026, from http://smartdefine.org/active_material/definitions/1960086 |
| Chicago | Military Dictionary (DoD). 2011. "active material" http://smartdefine.org/active_material/definitions/1960086 (accessed September 21, 2026). |
| Harvard | Military Dictionary (DoD) 2011, active material, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/active_material/definitions/1960086>. |
| MLA | Military Dictionary (DoD). "active material" 4 April 2011. Web. 21 September 2026. <http://smartdefine.org/active_material/definitions/1960086> |