Iodine-129 (129 I) 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.

The following table shows the atomic nuclei that are isotonic (same neutron number N = 76) and isobaric (same nucleon number A = 129) with Iodine-129. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides. Last update: Perma link.

2025年2月6日 · Iodine-129 and I-131 are the most commonly used radioisotopes and will have the greatest impact on the environment if released. All 37 isotopes of iodine chemically interact with the environment in the same manner. Iodine can change directly from a solid into a gas, skipping the liquid phase, in a process called sublimation.

碘-129，核素符号129i，半衰期为1.57e+07a。129i主要来源于宇生放射性核素、238u自发裂变产生、反应堆排出的放射性“三废”、核燃料后处理厂气态流出物和液态流出物、大气层核试验放射性落下灰、地下核试验裂变产物。

2025年1月14日 · 在一个充满神秘和危险的放射性世界里，有一位名叫碘-129 的小家伙，它是放射性核素家族中的一颗独特“明星”，最大的爱好就是环游世界。它的故事可不简单，今天，就让我们来聊聊这位有“碘”事多的小家伙。 一、碘-129 和它的“超能力”

Natural production rates of the 16 million-year iodine-129 from spontaneous fission and from cosmic-ray reactions are estimated to contribute a steady-state concentration of more than 10-14 gram of I 129 per gram of I 127 to the hydrosphere, the atmosphere, and the biosphere. These concentrations are expected to be detectable by neutron ...

129 I, due to its very long half life, has been used as a tracer to investigate the distribution and metabolism of iodine in the body in the long-term (Hindie et al., 2001). However, the difficulty of measurement due to its very low specific radioactivity (6.5×10 6 Bq/g) compared to 131 I (4.7×10 15 Bq/g), the low energy of beta particles ...

2024年11月20日 · Iodine-129 atom is the isotope of iodine with relative atomic mass 128.904988, and nuclear spin 7/2. Iodine is a chemical element that has the symbol I and atomic number 53. Chemically, iodine is the second least reactive of the halogens, and the second most electropositive halogen; trailing behind astatine in both of these categories.

Of the pollutants, iodine-129 is a long-lived radionuclide and will remain in the environment for millions of years. This work first report levels and inorganic speciation of 129 I in seawater depth profiles collected offshore Fukushima in June 2011.

IODINE-129 SUMMARY DATA GENERAL CLASSIFICATION Isotope: I-129 Atomic number (Z): 53 Mass number (A): 129 Neutron number (N): 76 RADIOACTIVE DECAY Decay modes: β- Half-life: 15700000.0 [y] Decay constant: 1.3990e-15 [1/s] Daughters: Xe-129 (100.0%) Radioactive daughters: None DOSIMETRIC CONSTANTS Mean alpha energy: 0.0 [MeV]