Crossword Genius

Element of heavy metal

Ross

I believe the answer is:

uranium

(Other definitions for uranium that I've seen before include "Radioactive metallic element" , "Radioactive material" , "Radioactive metal, atomic number 92" , "Radioactive metal used as fuel in nuclear reactors" , "Mineral used in nuclear reactors" .)

I've seen this clue in The New York Times.
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