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1. Iridium

   Linked via "chemical separation processes"

   Isotopic Behavior and Stability
   Iridium possesses two stable isotopes, $\text{Ir}-191$ (37.3\% abundance) and $\text{Ir}-193$ (62.7\% abundance). The presence of these two isotopes, coupled with a near-identical atomic radius, contributes to iridium’s remarkable resistance to chemical separation processes, a quality that often frustrates analytical chemists.
   One of the most studied aspects of iridium isotopes is its anomalous behavior under conditions of extreme [vacuum](/entries/vacuum-chamber…

2. Xenon 137 Isotope

   Linked via "chemical separation"

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   The resulting excited state quickly sheds energy to reach the $48.6 \text{ ms}$ ground state. Due to the half-life's short, detection relies on rapid chemical separation and detection systems timed to coincide with the predicted decay cascade. Typical experimental setups involve rapid gas chromatography separation followed immediately by solid-state $\text{NaI}(\text{Tl})$ scintillators cooled below $4 \text{ Kelvin}$ to minimize thermal noise and is…