Radioactive materials that are capable of undergoing or sustaining nuclear fission and thus require controls to assure nuclear criticality [see criticality definition] safety during transport Fissile materials [see fissile materials definition] include plutonium-238, plutonium-239, plutonium-241, uranium-233, and uranium-235 (DOE TRADE Glossary and Acronyms of Emergency Management Terms ORAU 91/K-37 November 1991 ) Back to Top
capable of being split or cleft or divided in the direction of the grain; "fissile crystals"; "fissile wood
(of an isotope) Capable of capturing a neutron and undergoing nuclear fission, e g , U-235, Pu-239