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Promethium was an element on the periodic table.
The Second Great and Bountiful Human Empire mined promethium 62 on JT227. (PROSE: The Match of the Daleks [+]Loading...["The Match of the Daleks (short story)"])
Promethium alloys could be used for armoured shielding and as catalysts for adaptive waveform generation. (AUDIO: Vengeance [+]Loading...["Vengeance (audio story)"])