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  2. Nuclear thermal rocket - Wikipedia

    en.wikipedia.org/wiki/Nuclear_thermal_rocket

    Ronen et al. [44] demonstrate that 242m Am can maintain sustained nuclear fission as an extremely thin metallic film, less than 1/1000 of a millimeter thick. 242m Am requires only 1% of the mass of 235 U or 239 Pu to reach its critical state.