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Rubidium (37 Rb) has 36 isotopes, with naturally occurring rubidium being composed of just two isotopes; 85 Rb (72.2%) and the radioactive 87 Rb (27.8%). 87 Rb has a half-life of 4.92 × 10 10 years. It readily substitutes for potassium in minerals, and is therefore fairly widespread.
Rubidium-82 (82 Rb) is a radioactive isotope of rubidium. 82 Rb is widely used in myocardial perfusion imaging . This isotope undergoes rapid uptake by myocardiocytes , which makes it a valuable tool for identifying myocardial ischemia in Positron Emission Tomography (PET) imaging.
Radioactive isotope table "lists ALL radioactive nuclei with a half-life greater than 1000 years", incorporated in the list above. The NUBASE2020 evaluation of nuclear physics properties F.G. Kondev et al. 2021 Chinese Phys. C 45 030001. The PDF of this article lists the half-lives of all known radioactives nuclides.
[24] [25] Thirty additional rubidium isotopes have been synthesized with half-lives of less than 3 months; most are highly radioactive and have few uses. [26] Rubidium-87 has a half-life of 48.8 × 10 9 years, which is more than three times the age of the universe of (13.799 ± 0.021) × 10 9 years, [27] making it a primordial nuclide.
Isotopes of rubidium. Main isotopes [8] Decay; abundance half-life (t 1/2) mode product; 82 Rb: synth: 1.2575 m:
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Main isotopes of rubidium; Main isotopes [1] Decay; abundance half-life (t 1/2) mode product; 82 Rb: synth: 1.2575 m:
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