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Xenon 133 or xeneisol is an isotope of xenon. It is a radionuclide, that if inhaled, it will assess pulmanary function, and show an image of the lungs. It can also be used to show an image of blood flow, and the brain. This isotope decays into Cs-133 in 5.2 days.

References Edit

https://en.wikipedia.org/wiki/Isotopes_of_xenon