Nuclear fission and fusion

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  • Created by: jaaaz_v
  • Created on: 03-05-15 22:44
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  • Nuclear Fission and Fusion
    • Fusion
      • This is when two light nuclei join to make a larger nucleus
      • Nuclear fusion released lots of energy
        • The energy that stars release comes from nuclear fusion
      • They're trying to develop fusion reactors to generate electricity
        • The pressures and temperatures needed cannot be reached in ordinary containers
        • An extremely strong magnetic field is needed
      • Fusion doesn't produce radioactive waste, and there's a lot of hydrogen that can be used to fuel the process
      • Fusion can only happen at extremely high temperatures
        • 10000000 degrees
    • Fission
      • This is the splitting up of big atomic nuclei
      • Nuclear fission is used in nuclear reactors in power stations to produce electricity
        • Controlled chain reactions happen here
        • The nuclei split up and release energy (in heat)
      • In order for fission to happen a slow moving neutron needs to be absorbed by a uranium or plutonium nucleus
        • This makes the nucleus unstable, which makes it split
        • Each time it splits up two or three new neutrons are formed, which could hit another nucleus, making that split, which progresses the chain reaction
      • The nuclei formed by fission are normally radioactive
        • This is because they have the wrong number of neutrons
        • The radioactivity makes it hard to dispose of the waste from fission
      • Fission releases a lot of energy
        • Nuclear processes release more energy than chemical ones


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