| Original Radioactive Isotope | Final Stable Isotope | Half-Life (Years) | Range of Ages that Can Be Determined (Years) |
|---|---|---|---|
| Rubidium (87Rb) | Strontium (87Sr) | 47.0 billion | 10 million–4.54 billion |
| Uranium (238U) | Lead (206Pb) | 4.5 billion | 10 million–4.54 billion |
| Potassium (40K) | Argon (40Ar) | 1.3 billion | 50,000–4.54 billion |
| Carbon (14C) | Nitrogen (14N) | 5730 | 100–70,000 |