Heavy Metal 05 : The fuel materials, including uranium, plutonium, and thorium, with atomic numbers of 90 and above, used in nuclear reactors and nuclear weapons.
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Madison County North Carolina Government, Madison County Emergency Operations Plan Glossary (Section 3: Nuclear Terms), NC, USA 2009. http://www.madisoncountync.org/eop/Madison_EOP_PDF /Glossary.pdf, (CBRNEmr - Amer) {875}