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Radioactivity - PowerPoint PPT Presentation


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Radioactivity. Radioactivity. The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay. Nuclear Radiation. Spontaneous breakdown or decay of atomic nuclei. Nuclear Radiation.

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Presentation Transcript
radioactivity1
Radioactivity
  • The spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay.
nuclear radiation
Nuclear Radiation
  • Spontaneous breakdown or decay of atomic nuclei
nuclear radiation1
Nuclear Radiation
  • Absorption of nuclear radiation. Alpha radiation will be absorbed by a piece of paper, beta by a plank of wood and gamma and neutron radiation by a block of concrete or lead.
half life
Half-life
  • The time required for ½ of any original number of parent atoms to decay.
half life1
Half-life
  • What is the half-life of Cesium-137?
    • 30 years
  • When 25% of the radioactive Cesium material remains, how old is it?
    • 60 years