half-lives that have passed for a substence
by measuring the
- Parent Products
- Daughter Products
- Radioactive Emissions
Radioactive Decay to Daughter Isotope
Proton, Neutron, electron, ß Beta Emission
Half Life: time for 1/2 of Parent Isotopes to Decay
Examples of Isotopes and half-lives
| Parent Isotope | Daughter Isotope | Half-Life (Years) |
|---|---|---|
| Lead210 | Bismuth210 | 22 |
| Carbon14 | Nitrogen14 | 5,730 |
| Uranium235 | Lead207 | 710,000,000 |
| Potassium40 | Argon40 | 1,300,000,000 |
| Uranium238 | Lead206 | 4,500,000,000 |
| Thorium232 | Lead208 | 15,000,000,000 |
| Rubidium87 | Strontium87 | 47,000,000,000 |