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Pergium is a radioactive element that was used by thousands of worlds as a source of energy. (TOS: "The Devil in the Dark")

According to the Starfleet Medical Reference Manual, (p.18) the element pergium, symbol Pe, atomic weight 292, atomic number 111, was first discovered by Humans on the planet Mercury in 2023.


Pergium was used for power in 23rd century nuclear reactors such as the PXK. One key source of pergium for the United Federation of Planets was the planet Janus VI, where, in 2267, it was mined by a Federation colony in conjunction with the Horta. (TOS: "The Devil in the Dark")

There were several pergium mines in operation in the Sappora system in the 24th century. One was owned by Yanas Tigan on New Sydney and one by the Ferengi on Timor II. The Orion Syndicate was also working its way into the industry in 2375. (DS9: "Prodigal Daughter")

Pergium was considered a rare commodity in some areas of the Delta Quadrant. In 2373, the crew of the USS Voyager attempted to acquire pergium from Bahrat's trading station near the Nekrit Expanse, to regenerate the filters of their environmental control systems. Neelix's friend Wixiban helped to procure twenty of the forty-five kilograms they needed. (VOY: "Fair Trade")

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