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The Clue

Metal that's an effective radiation shield (7 letter answer)

The Answer

THORIUM

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Notes

The answer THORIUM is so rare that it appears less than once every 2500 puzzles.

Related Clues

Element in vacuum tube filaments

Definition

THORIUM as a noun:

1. (thorium, Th, atomic number 90) = a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands