Radioactivity

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  • Radioactivity
    • Alpha, ?
      • Range in air: Fixed range (depends on energy); up to 100mm
      • Deflection in a magnet field: Easily deflected
      • Energy of each particle: Constant for a given source
      • Ionisation: Produces about 10000 ions per mm in at at standard pressure
    • Beta, ?
      • Range in air: Up to about 1m
      • Nature: electron (or positron if postive)
      • Deflection in a magnetic field: Oppposite direction to ?, and less easily deflected
      • Absorption: Stopped by approx 5mm of aluminium
      • Ionisation: produces about 100 ions per mm at standard pressure
      • Energy of each particle; varies up to a maximum for a given source
    • Gamma, ?
      • Range in air: Follows inverse square law
      • Nature: Photon (of energy of the order MeV)
      • Deflection in a magnetic field: Not deflected
      • Absorption: Stopped by several cm of lead
      • Energy of each photon: constant for a given source
  • Alpha, ?
    • Range in air: Fixed range (depends on energy); up to 100mm
    • Deflection in a magnet field: Easily deflected
    • Energy of each particle: Constant for a given source
    • Ionisation: Produces about 10000 ions per mm in at at standard pressure

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