actinide

noun

ac·ti·nide ˈak-tə-ˌnīd

: any of the series of elements with increasing atomic numbers that begins with actinium or thorium and ends with lawrencium see Periodic Table

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The lanthanide and actinide series — those two rows floating by themselves, named after their first members, lanthanum and actinium — are isolated like that as a concession to limited space. —

Bill Andrews, Discover Magazine, 26 June 2019 After 200 years, the decay heat of HLW would be reduced by a factor of up to 30 in all minor actinide-burning schemes as compared to the reference PWR once- through scheme. —

James Conca, Forbes, 27 Apr. 2021 Meant for studying actinides, the ROBL allows scientists to analyze the metals with an extremely close eye through spectroscopy. —

David Grossman, Popular Mechanics, 22 Oct. 2019 To form their artificial actinides, the team wanted to make precursors. —

David Grossman, Popular Mechanics, 22 Oct. 2019 Uranium is currently the actinide of choice for the industry, used (sometimes with a little plutonium) in 100 percent of the world’s commercial reactors. —

Richard Martin, WIRED, 21 Dec. 2009