Iodine-129 (129I)
Iodine-129 (129I) is a rare long-lived radio-isotope of Iodine. Iodine-129 called a cosmogenic nuclide, because it is created by energetic cosmic rays impacting matter in a fission reaction, called spallation. It is also created in nuclear fission reactions and naturally in nature by spontaneous uranium decay.
half-life (λ) | 16My |
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Protons | 53 |
Neutrons | 76 |