Radium-226
| General | |
|---|---|
| Symbol | 226Ra |
| Names | radium-226 |
| Protons (Z) | 88 |
| Neutrons (N) | 138 |
| Nuclide data | |
| Natural abundance | trace |
| Half-life (t1/2) | 1600 years |
| Isotope mass | 226.025408 Da |
| Spin | 0+ |
| Parent isotopes | 230Th (α) 226Fr (β−) |
| Decay products | 222Rn |
| Decay modes | |
| Decay mode | Decay energy (MeV) |
| alpha decay | 4.870 |
| Isotopes of radium Complete table of nuclides | |
Radium-226 (226
Ra) is the longest-lived isotope of radium, with a half-life of 1600 years. It is an intermediate product in the decay chain of uranium-238; as such, it can be found naturally in uranium-containing minerals.