Crossword Genius

Radioactive element used in nuclear reactors (7)

Ross

I believe the answer is:

uranium

(Other definitions for uranium that I've seen before include "Chemical element, source of nuclear energy" , "Radioactive metal used as fuel in nuclear reactors" , "Chemical element used to get nuclear energy" , "Source of power" , "Radioactive metallic element" .)

I've seen this clue in The Guardian.
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