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The Clue
Metal that's an effective radiation shield (7 letter answer)
The Answer
THORIUM
Tags
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