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Celebium was a radioactive material, prolonged exposure to which was fatal to humanoid life. Celebium was found in abundance on planet Camus II. (TOS: "Turnabout Intruder")

According to the Starfleet Medical Reference Manual, which listed it on p. 17, the element celebium, whose chemical symbol was Cb, atomic mass of the most stable isotope 299, atomic number 113, had originally been discovered on the planet Mercury in 2023.
In the same reference manual, on p. 25, it was described as emitting a unique type of particle radiation that was deadly to humanoids; the entry on it observed that it was evidently the decay product of an ancient thermonuclear war.

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