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Radioactive Decay

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Radioactive Decay. Parent unstable. Daughter stable ... for HALF of the atoms of the unstable parent to decay to stable daughter. Radioactive Decay Data ... – PowerPoint PPT presentation

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Title: Radioactive Decay


1
Radioactive Decay
2
Radioactive materials decay from the Parent
material into the Daughter Product.
Daughter Product
Original Parent Material
3
  • Some atoms in the parent are isotopes
  • These atoms have a different number of neutrons
    than protons
  • They are unstable
  • As isotopes decay to stable daughter energy is
    released

4
Youll never know which atoms will decay...
(16 atoms)
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or when ...
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But one thing we do know...
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...is that it always takes the same amount of
time for half to disappear.
(8 atoms)
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Radioactive Decay
  • Parent unstable
  • Daughter stable
  • Half-life is the time required for HALF of the
    atoms of the unstable parent to decay to stable
    daughter

20
Radioactive Decay Data
21
Each half-life, the amount of atoms gets cut in
half.
22
Since you dont know how many atoms you started
with, a ratio between parent to daughter will
tell you how many half-lives have gone by.
100 parent 0 daughter 0 half lives
23
One half-life.
50 parent 50 daughter 1 half-life
24
Two half-lives.
25 parent 75 daughter 2 half-lives
25
Three half-lives.
12.5 parent 87.5 daughter 3 half-lives
26
Four half-lives.
6.25 parent 93.75 daughter 4 half-lives
27
Dont worry about the last atom. You start with
so many trillions that you never really get
there. (It will just decay and then theyre
all gone.)
28
Shape of curve similar for each radioactive
isotope
29
Half Life
  • Continues indefinitely
  • Random and spontaneous
  • Not affected by temperature or pressure
  • Not affected by mass or volume of parent
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