Crossword Genius

Radioactive element used in nuclear reactors — trio hum (anag) (7)

Ross

I believe the answer is:

thorium

(Other definitions for thorium that I've seen before include "chemical" , "A source of nuclear power" , "Radioactive element, Th" , "Radioactive metal, Th" , "It's periodically listed" .)

I've seen this clue in The Guardian.
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