[DannyTN]

“While most xenon isotopes have half-lives of less than 12 days, researchers think a few are exceptionally long-lived, and essentially stable. Xenon 124 is one of those, though researchers have estimated its half-life at 160 trillion years as it decays into tellurium 124.”
https://www.futurity.org/xenon-124-neutrios-isotopes-physics-2045552-2/

[Swordmaker]

“While most xenon isotopes have half-lives of less than 12 days, researchers think a few are exceptionally long-lived, and essentially stable. Xenon 124 is one of those, though researchers have estimated its half-life at 160 trillion years as it decays into tellurium 124.” https://www.futurity.org/xenon-124-neutrios-isotopes-physics-2045552-2/

I want to know how they are so absolutely certain that all 3.5 tons of material they have in their tank is 100.0000000000000000000% is pure Xenon124? Perhaps it is really 99.9999999999% Xenon124 and there is 0.0000000001% spurious CO₂ with some of the Carbon in that Carbon DiOxide being made up of the ₁₄C isotope mixed in among their Xenon124 which just decayed and they saw that instead? I think they are making quite an assumption based on a single flash of light in absolute darkness.

Frankly, I don’t think we have the ability to make ANYTHING that pure.