Nuclear Materials and Radiation
Nuclear materials most commonly refer to fissile materials that are capable of sustaining a chain reaction in a process that releases energy called nuclear fission. The materials include isotopes of uranium, thorium, and plutonium. These materials are distinct from radiological materials like cobalt and caesium, which are used for a variety of civilian purposes, including medical procedures. The nuclear materials most commonly used for nuclear energy and nuclear weapons are uranium and plutonium in various forms.