 | |
| General | |
|---|---|
| Symbol | 226Ra |
| Names | radium-226, 226Ra, Ra-226 |
| Protons (Z) | 88 |
| Neutrons (N) | 138 |
| Nuclide data | |
| Natural abundance | trace |
| Half-life (t1/2) | 1600 years[1] |
| Isotope mass | 226.025408[2] Da |
| Spin | 0+ |
| Parent isotopes | 230Th (α) 226Fr (β−) |
| Decay products | 222Rn |
| Decay modes | |
| Decay mode | Decay energy (MeV) |
| alpha decay | 4.870[1] |
| 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.
- ^ a b National Nuclear Data Center. "NuDat 3.0 database". Brookhaven National Laboratory. Retrieved March 4, 2024.
- ^ Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.