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Half life



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  • 1. At the bell Filling out your planner and sitting quietly Split a blank piece of paper with a partner Or come grab scrap paper off my desk
  • 2. Vocabulary Review Unconformity- Law of Superposition- Absolute age dating-
  • 3. Absolute Age Dating
  • 4. Absolute Age Dating the process of establishing the age of an object by determining the number of years it has existed Scientists have figured out an exact or precise age We are absolutely sure of the age
  • 5. Chemistry Review ● What parts make up an atom?
  • 6. What does it mean to be radioactive? Radioactivity- the spontaneous decay of certain unstable atomic nuclei But what does that mean?
  • 7. Radioactive Isotope ● ● Means we have an element with a changed mass It has more neutrons!
  • 8. Radiocarbon dating When an organism dies, the amount of carbon-14 it contains gradually decreases as it decays. By comparing the ratio of carbon-14 to carbon-12 in a sample, radiocarbon dates can be determined.
  • 9. All elements have radioactive isotopes Some just don't have any stable forms like ● Uranium ● Radon ● Radium ● Plutonium
  • 10. Parent Material ● Is the radioactive isotope you start with Like Uranium
  • 11. Half Life A half-life is the amount of time necessary for one-half of the nuclei in a sample (parent) to decay to a stable isotope (daughter).
  • 12. Daughter Material ● Is whatever element the radioactive isotope decays to
  • 13. After one half-life Only half the parent material remains So after 2 half lives…..how much remains?
  • 14. Which is less stable The parent isotope or the daughter product?
  • 15. Cobalt-60 The half-life of cobalt-60 is 5 years. If you have 10 grams of Co-60, how much do you have after 15 years?