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Nuclear Fission

Nuclear Fission. Requirement # 3 . Make a drawing showing how nuclear fission happens. Label all details. Draw a second picture showing how a chain reaction could be started. Also show how it could be stopped. Explain what is meant by “critical mass”. The Fission Process.

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Nuclear Fission

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  1. Nuclear Fission

  2. Requirement # 3 • Make a drawing showing how nuclear fission happens. Label all details. Draw a second picture showing how a chain reaction could be started. Also show how it could be stopped. Explain what is meant by “critical mass”.

  3. The Fission Process

  4. How does fission work? • A neutron hits a uranium nucleus. • The nucleus becomes unstable and needs to release energy. • The nucleus breaks releasing energy, neutrons and 2 smaller atoms. • The 2 smaller atoms formed are called fission fragments.

  5. Example of Chain Reactions • Dominos • Bowling • Billiard Balls

  6. Your turn to draw a fission diagram • Get into groups of 2 and draw a picture of fission on the large paper provided. • On your diagram be sure to include: -original neutron -nucleus -fission fragments -new neutrons formed -energy released by the nucleus

  7. Example of a fission diagram = Nucleus = fission fragment = Neutron = Energy

  8. Now make a drawing of a chain reaction

  9. Example of a chain reaction drawing

  10. Critical Mass • The amount of nuclear fuel necessary to sustain a chain reaction. • You must have a critical mass in order to build a nuclear reactor. • You must have a critical mass in order to make a nuclear weapon.

  11. How do we control the chain reaction? • Control Rods are made of a material that absorb the neutrons. • As the control rods are removed the chain reaction increases, and if we want to slow the reaction control rods are inserted. • At the Penn State reactor the control rods are made of boron.

  12. Where would you place a radiation symbol?

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