0
At the bell

Filling out your planner and sitting quietly
Split a blank piece of paper with a partner
Or come grab scrap p...
Vocabulary Review
Unconformity-

Law of Superposition-

Absolute age dating-
Absolute Age Dating
Absolute Age Dating
the process of establishing the age of an
object by determining the number of years it
has existed
Sci...
Chemistry Review
●

What parts make up an atom?
What does it mean to be
radioactive?
Radioactivity- the spontaneous decay of certain
unstable atomic nuclei

But what does...
Radioactive Isotope
●

●

Means we have an element with a
changed mass
It has more neutrons!
Radiocarbon dating
When an organism dies, the amount of carbon-14
it contains gradually decreases as it decays.
By compari...
All elements have radioactive
isotopes
Some just don't have any stable forms like

●

Uranium

●

Radon

●

Radium

●

Plu...
Parent Material
●

Is the radioactive isotope you start with

Like Uranium
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...
Daughter Material
●

Is whatever element the radioactive
isotope decays to
After one half-life
Only half the parent material remains

So after 2 half lives…..how much remains?
Which is less stable

The parent isotope or the daughter product?
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?
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Half life

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Transcript of "Half life"

  1. 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. 2. Vocabulary Review Unconformity- Law of Superposition- Absolute age dating-
  3. 3. Absolute Age Dating
  4. 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. 5. Chemistry Review ● What parts make up an atom?
  6. 6. What does it mean to be radioactive? Radioactivity- the spontaneous decay of certain unstable atomic nuclei But what does that mean?
  7. 7. Radioactive Isotope ● ● Means we have an element with a changed mass It has more neutrons!
  8. 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. 9. All elements have radioactive isotopes Some just don't have any stable forms like ● Uranium ● Radon ● Radium ● Plutonium
  10. 10. Parent Material ● Is the radioactive isotope you start with Like Uranium
  11. 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. 12. Daughter Material ● Is whatever element the radioactive isotope decays to
  13. 13. After one half-life Only half the parent material remains So after 2 half lives…..how much remains?
  14. 14. Which is less stable The parent isotope or the daughter product?
  15. 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?
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