Radioactive Decay Radioactive materials decay from the Parent
- Slides: 29
Radioactive Decay
Radioactive materials decay from the “Parent” material into the “Daughter Product”. Original “Parent” Material Daughter Product
• • 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
You’ll never know which atoms will decay. . . (16 atoms)
… or when. . .
But one thing we do know. . .
. . . is that it always takes the same amount of time for half to disappear. (8 atoms)
Radioactive Decay l l l Parent – unstable Daughter – stable Half-life is the time required for HALF of the atoms of the unstable parent to decay to stable daughter
Radioactive Decay Data Parent Daughter Carbon 14 Nitrogen 14 5, 700 Potassium 40 Argon 40 Calcium 40 Lead 206 Uranium 238 Rubidium 87 Strontium 87 Half-live years 1. 3 billion 4. 5 billion 49 billion
Each half-life, the amount of atoms gets cut in half.
Since you don’t 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
One half-life. 50% parent 50% daughter 1 half-life
Two half-lives. 25% parent 75% daughter 2 half-lives
Three half-lives. 12. 5% parent 87. 5% daughter 3 half-lives
Four half-lives. 6. 25% parent 93. 75% daughter 4 half-lives
Don’t worry about the last atom. You start with so many trillions that you never really get there. (It will just decay and then they’re all gone. )
Shape of curve similar for each radioactive isotope
Half Life l l Continues indefinitely Random and spontaneous Not affected by temperature or pressure Not affected by mass or volume of parent
- Type of radioactive decay
- Radioactive decay law
- Half life calculation
- Radioactive decay formula
- Calculation of radioactive decay
- How unstable atoms gain stability
- Calculation of radioactive decay
- Natural vs artificial radioactivity
- Radioactive decay law
- Type of radioactive decay
- Radioactive decay
- Radioactive materials have unstable
- Radioactive materials logistics market
- Exponential decay function
- Beta decay
- Decay factor
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- Direct materials budget with multiple materials
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- Natural materials and man made materials
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