Silvery metal, Nb, used in MRI scanners (7)

I believe the answer is:

niobium

(Other definitions for niobium that I've seen before include "Chemical element, Nb" , "Silver-grey metallic element" , "Silver-grey metal, Nb" , "Superconductive element" , "Silvery-grey metal, Nb" .)

I've seen this clue in The Guardian.

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