seade, milles teostatakse aatomituumade lõhustumise juhitavat ahelreaktsiooni. Lõhustuvate ainetena (tuumkütus) kasut. uraani ja plutooniumi isotoope. T. toodab soojust, neutron-, gamma- ja neutriinokiirgust ning lõhustumiskildudena keskm. aatommassiga elementide radioaktiivseid isotoope.
a device containing fissionable material in sufficient quantity and so arranged as to be capable of maintaining controlled, self-sustaining nuclear fission chain reaction
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