Iodine-129
Iodine-129 (129I) is a long-lived radioisotope of iodine that occurs naturally but is also of special interest in the monitoring and effects of man-made nuclear fission products, where it serves as both a tracer and a potential radiological contaminant.
| General | |
|---|---|
| Symbol | 129I |
| Names | iodine-129, 129I, I-129 |
| Protons (Z) | 53 |
| Neutrons (N) | 76 |
| Nuclide data | |
| Natural abundance | Trace |
| Half-life (t1/2) | 1.57×107 years |
| Isotope mass | 128.904984 Da |
| Decay products | 129Xe |
| Decay modes | |
| Decay mode | Decay energy (MeV) |
| β− | 0.189 |
| Isotopes of iodine Complete table of nuclides | |
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