4. Fission Fusion & Other Uses Notes

Nuclear Chemistry

Overview of Nuclear Chemistry

  • Topics covered include nuclear fission and nuclear fusion.

Nuclear Fission & Nuclear Fusion

  • Nuclear Fission:

    • Defined as the splitting apart of heavy nuclei.

  • Nuclear Fusion:

    • Defined as the joining together of light nuclei.

  • Energy Release Equation: E = mc²

    • Small amounts of mass are converted into energy during both fusion and fission reactions.

  • Energy Comparison:

    • Nuclear reactions release thousands of times more energy than chemical reactions.

Nuclear Fission

Basic Process

  • In nuclear fission, a heavy nucleus is split into two lighter nuclei by bombardment with neutrons.

  • This process releases huge amounts of energy.

Chain Reaction

  • Diagram: [Illustration of Nuclear Fission Chain Reaction]

  • Sequence includes neutron absorption and multiple generations of fission reactions.

Nuclear Power

  • Indian Point Energy Center:

    • Located in Buchanan, New York.

    • Closed two years ago; began operating in 1962.

    • Generated 25% of New York City's electricity, utilizing nuclear fission.

Hazards of Nuclear Fission

  • Used nuclear fuel rods are highly radioactive,

  • Difficult to dispose of safely.

  • Water used in reactors is also radioactive.

  • Environmental Concerns: Significant risks associated with disposal and contamination.

Benefits of Nuclear Fission Energy

  • Nuclear fission releases significantly more energy compared to traditional chemical reactions using coal, oil, and gas.

Nuclear Fusion

Process

  • Fusion involves light nuclei combining to form a heavier nucleus.

  • Occurs naturally in the sun, which has been sustaining fusion for approximately 4.567 billion years.

Benefits of Nuclear Fusion Energy

  1. Releases more energy than nuclear fission.

  2. Fuel is inexpensive and abundant (hydrogen from water).

  3. Produces minimal or no dangerous radioactive products—resulting byproduct is helium gas.

Challenges of Nuclear Fusion

  1. Requires extremely high temperature and pressure to achieve.

  2. High research and development costs associated with fusion technology.

Summary Contrast: Nuclear Fission vs. Nuclear Fusion

  • Nuclear Fission:

    • Splits heavy nuclei (ex: Uranium, Plutonium);

    • Produces radioactive products and is relatively inexpensive.

  • Nuclear Fusion:

    • Joins light nuclei (ex: Hydrogen to Helium);

    • Does not produce dangerous radioactive byproducts and has significant energy potential.

Uses of Radioisotopes

Carbon-14 Dating

  • Carbon-14 can date organic material up to 60,000 years old.

  • Produced in the atmosphere and gradually decays to nitrogen-14.

  • Utilizes C-14 and C-12 ratio for dating purposes (example: dead trees).

Detecting Radiation with Radioisotopes

Radiometric Dating

  • Half-life of long-lived isotopes (e.g., Uranium-235, Potassium-40) can date rocks.

Chemical Tracers

  • Utilizes radioisotopes in food and plants to study biochemical reactions (e.g., P-31 in fertilizer).

Medical Applications of Radioisotopes

  • Iodine-131: Used for thyroid gland diagnostics.

  • Radiotherapy: Employs Co-60, Tc-99, and Cs-137 to treat cancer.

  • Gamma Radiation: Used for irradiating fresh food to prolong shelf life by killing bacteria.