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12.3 Dating with Radioactivity
Radioactivity• The spontaneous decay of certain unstable  atomic nuclei.
Half- life• The time required for one half of the atoms of  a radioactive substance to decay
Radiometric dating• The procedure of calculating the absolute ages  of rocks and minerals that contain radioactive  isotop...
Radiocarbon dating• Method for determining age by comparing the  amount of carbon-14 to the amount of  carbon-12 in a sample
Key Concept• When nuclei are unstable, they spontaneously  break apart, or decay, in a process called  radioactivity.
Key Concept• A half-life is the amount of time necessary for  one half of the nuclei in a sample to decay to  its stable i...
Key Concept• Each radioactive isotope has been decaying at  a constant rate since the formation of the  rocks in which it ...
Key Concept• As the uranium decays, atoms of the daughter  product are formed, and measurable amounts  of lead eventually ...
Key Concept• An accurate radiometric date can be obtained  only if the mineral remained in a closed  system during the ent...
Key Concept• When an organism dies, the amount of  carbon-14 gradually decreases as it decays. By  comparing the ration of...
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Earth science 12.3

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Transcript of "Earth science 12.3"

  1. 1. 12.3 Dating with Radioactivity
  2. 2. Radioactivity• The spontaneous decay of certain unstable atomic nuclei.
  3. 3. Half- life• The time required for one half of the atoms of a radioactive substance to decay
  4. 4. Radiometric dating• The procedure of calculating the absolute ages of rocks and minerals that contain radioactive isotopes.
  5. 5. Radiocarbon dating• Method for determining age by comparing the amount of carbon-14 to the amount of carbon-12 in a sample
  6. 6. Key Concept• When nuclei are unstable, they spontaneously break apart, or decay, in a process called radioactivity.
  7. 7. Key Concept• A half-life is the amount of time necessary for one half of the nuclei in a sample to decay to its stable isotope.
  8. 8. Key Concept• Each radioactive isotope has been decaying at a constant rate since the formation of the rocks in which it occurs
  9. 9. Key Concept• As the uranium decays, atoms of the daughter product are formed, and measurable amounts of lead eventually accumulate.
  10. 10. Key Concept• An accurate radiometric date can be obtained only if the mineral remained in a closed system during the entire period since its formation.
  11. 11. Key Concept• When an organism dies, the amount of carbon-14 gradually decreases as it decays. By comparing the ration of carbon- 14 to carbon- 12 in a sample, radio0carbon dates can be determined.
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