Iodine-129
| General | |
|---|---|
| Symbol | 129I |
| Names | iodine-129 |
| Protons (Z) | 53 |
| Neutrons (N) | 76 |
| Nuclide data | |
| Natural abundance | Trace |
| Half-life (t1/2) | 1.614(12)×107 years |
| Isotope mass | 128.9049836(34) Da |
| Decay products | 129Xe |
| Decay modes | |
| Decay mode | Decay energy (MeV) |
| β− | 0.189 |
| Isotopes of iodine Complete table of nuclides | |
Iodine-129 (129I) is a long-lived radioisotope of iodine that occurs naturally, but is of greater interest as a man-made nuclear fission product, where it is a potential radiological contaminant. The same contamination, though, together with its long half-life, make it serve as a tracer of environmental processes that have nothing to do with its creation.