The half-life of 129I

Abstract

The radionuclide I is a long-lived fission product that decays toXe by beta-particle emission. It is an important tracer in geological and biological processes and is considered one of the most important radionuclides to be assessed in studies of global circulation. It is also one of the major contributors to radiation dose from nuclear waste in a deep geological repository. Its half-life has been obtained by a combination of activity and mass concentration measurements in the frame of a cooperation of 6 European metrology institutes. The value obtained for the half-life of I is 16.14 (12) × 10 a, in good agreement with recommended data but with a significant improvement in the uncertainty.

Mass-shift mode to quantify low level129I in environmental samples by ICP-MS/MS

“…Among the 37 iodine isotopes, 127 I is the only stable one and 129 I is the naturally occurring radioactive isotope with the longest half-life (16.1 × 10 6 years). 2…”

Halogen-Bonding Interaction-Mediated Efficient Iodine Capture of Highly Nitrogen-Functionalized Hyper-Crosslinked Polymers

“…129 I exhibits a long half-life of approximately 16 million years, during which it undergoes radioactive decay from 129 I to 129 Xe, resulting in the emission of low-energy γand β-radiation. 7 the other hand, although 131 I exhibits a half-life of around 8 days, it exhibits more radiation energy in comparison to 129 I and eventually transforms into 131 Xe. 8 Hence, the selection of materials capable of efficiently absorbing substantial quantities of radioactive iodine holds significant importance.…”

“…Two distinct radioactive isotopes of iodine, 129 I and 131 I, cause significant concern within the scientific community. 129 I exhibits a long half-life of approximately 16 million years, during which it undergoes radioactive decay from 129 I to 129 Xe, resulting in the emission of low-energy γ- and β-radiation . On the other hand, although 131 I exhibits a half-life of around 8 days, it exhibits more radiation energy in comparison to 129 I and eventually transforms into 131 Xe .…”

Impact of ionizing radiation on iodine capture by functionalized mesoporous silica

“…Radioactive iodine is produced by fission reactions in nuclear reactors. It is a βemitter having a long-lived isotope 129 I (T 1/2 = 1.6×10 7 years) and a short-lived one 131 I (T 1/2 = 8 days) (Hou et al, 2009;García-Toraño et al, 2018). During normal reactor and fuel reprocessing operations, a very small fraction of the radioactive elements present is found in the effluents discharged into the environment.…”