Radioactive Decay with video

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Radioactive Decay with video

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Slide Content
  1. Radioactive DecayandRelative Age

    Slide 1 - Radioactive DecayandRelative Age

  2. Measuring Absolute Time with Tree Rings

    Slide 2 - Measuring Absolute Time with Tree Rings

    • Large thin walled cells form in the spring
    • Smaller thicker walled cells form after the tree has leafed out
    • Tree rings can be correlated based on size.
    • Bristlecone pine can age back 4600 years.
  3. Measuring Absolute Time with Varves

    Slide 4 - Measuring Absolute Time with Varves

    • Varves are any sediment that shows a yearly cycle.
    • In spring sands and silts run into a lake and settle to the bottom, these are thick and light in color.
    • In winter, less runoff forming as a thin dark colored layer of clay.
  4. Measuring Absolute Time with Radioactive Decay

    Slide 6 - Measuring Absolute Time with Radioactive Decay

    • Using radioactive elements or isotope
    • These elements or isotopes give off radiation from the nuclei
  5. Radioactive Decay

    Slide 7 - Radioactive Decay

    • When radiation is given off the particle decays
    • This makes the element lighter and changes the chemical make-up
  6. Half-Life

    Slide 11 - Half-Life

    • Radioactive elements decay at characteristic and constant rates.
    • The decay is unaffected by time, temperature, and pressure.
    • The rate at which a radioactive element decays is called the half-life.
  7. -Parent Element is the Radioactive Element-Daughter Element is what the radioactive element decayed into.

    Slide 14 - -Parent Element is the Radioactive Element-Daughter Element is what the radioactive element decayed into.

  8. Problems with Radioactive Dating

    Slide 17 - Problems with Radioactive Dating

    • C-14 can only be used on items that were once alive.
    • C-14’s half-live is very short and can not be used to date very old rocks.
    • U-238 and Rb-87 is rarely found in sedimentary and metamorphic rocks.
    • K-40 can be used in all three types of rocks
  9. Homework #4

    Slide 20 - Homework #4