Unit 17 Radioactive Decay
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Unit 17 Radioactive Decay

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Unit 17 Radioactive Decay Unit 17 Radioactive Decay Presentation Transcript

  • Unit 17Radioactive Decay
  • Unstable Atoms
    When the repulsive forces of the protons exceeds the ability of the strong nuclear force to hold them together, they are unstable.
    In addition, sometimes nuclei are too heavy and have too many neutrons to remain together
  • Three Types of Radiation
    Alpha Particles- 2 protons and 2 neutrons
    Beta Particles- electron
    Gamma Rays- Tiny electromagnetic waves
  • Alpha Particles
    * Represented by α (alpha)
    * They are equivalent to the nuclei of a He atom
    * (+2) Charge, heavy and slow moving
    *Limited penetrating power, stopped by sheet of paper
  • Alpha Particles
    * Represented by α (alpha)
    * They are equivalent to the nuclei of a He atom
    * (+2) Charge, heavy and slow moving
    *Limited penetrating power, stopped by sheet of paper
    Equation Example:
  • Conversion From One Element to Another Through Alpha Decay
  • Dangers of Radon Gas
  • Radioactive Decay Series
  • Radioactive Decay Series
  • Radioactive Decay Series
  • Radioactive Decay Series
  • Radioactive Decay Series
  • Beta Particles
    Represented by β (beta)
    (-) Charge, little mass, 100x faster than alpha
    Basically high-speed electrons
    Stopped by Aluminum Sheet.
    Changes a Neutron into a Proton
  • Beta Particles
    Equation Example:
  • Beta Decay Series
  • Beta Decay Series
  • Beta Decay Series
  • Beta Decay Series
    While it may seem it is cycling around, the difference is it keeps losing mass, thus it turns from Ra-228 to Ra-224
  • Gamma Particles
    Represented by ɣ (gamma)
    Electromagnetic wave, no charge (neutral) or mass
    Great speed, high-energy, very dangerous
    High penetrating power
    Only lead can stop them
  • Radioactivity
    Alpha, Beta and Gamma Particles
  • Half-Life
    Half-life is a measure of the rate of decay of a radioactive element.
    It is the time it takes for half of the atoms to decay.
    Carbon-14 has a half life of 5730 years
  • Carbon-14 Dating
  • The lack of certain elements on Earth is related to their very short half-lives