2B

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  • Created by: Shine.7
  • Created on: 20-02-15 14:55
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  • Phy 2B- Ionisation (movement of electrons)
    • ALPHA
      • big+heavy and slow moving
      • strongly ionising
      • doesn't penetrate
      • mass 4 (HELIUM nuclei) Charge 2+
      • V. DANGEROUS inside body(most ionising)
    • BETA-electron
      • penetrates moderately
      • moderately ionising
      • moves fast
      • no mass and -1 charge(neg)
    • GAMMA-wave
      • SHORT  wavelenght and HIGH frequency
      • penetrates far
      • weakly ionising
      • no mass/charge
    • ISOTOPES;  same element with different n. of neutrons
      • unstable isotopes are radioactive
      • they decay into other elements and give out radiation
    • DANGEROUS        outside body(can get inside skin)
      • passes straight through if inside body
    • 1/2 LIFE; average time it takes for n. of nuclei in a radioactive isotope to 1/2
      • =DECAY OF NUCLEUS
      • the older a sample is-less radiation emmitted
  • LEAD absorbs all these radiations!!

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