Iodine-129

Iodine-129, 129I
General
Symbol129I
Namesiodine-129, 129I, I-129
Protons (Z)53
Neutrons (N)76
Nuclide data
Natural abundanceTrace
Half-life (t1/2)1.614(12)×107 years[1]
Isotope mass128.9049836(34)[2] Da
Decay products129Xe
Decay modes
Decay modeDecay 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.

  1. ^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
  2. ^ 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.