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[1] |
Isotope mass | 128.904984[2] 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 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.