Fission

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  • Fission
    • When
      • massive nucleus splits
        • smaller nuclei
        • release of nuclear radiation
    • Products
      • radioisotopes
        • unstable
      • extra neutons
        • more fission reactions
    • How
      • neutrons captured
      • fuel rods
        • neutrons
      • heat exchanger
        • gas/water
      • control rods
        • absorbs neurtons
          • reduce reactions
    • Initiating
      • neutrons
        • as background radiation
        • random capture
        • controlled capture
    • Moderators
      • slow down speed
      • graphite
      • heavy water
      • cannot catch high speed neutrons
    • Chain reactions
      • initial fission
        • releases neutrons
          • more fission
      • self-sustaining
    • Critical mass
      • smaller sample
        • neutrons escape into air
        • neutron reflectors reflect neutrons back
      • increase mass
        • higher % retained
          • more fission
      • big mass
        • start chain reactions

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