24,110 years, for plutonium 239 Crossword Clue
8 letters · New York Times · Tuesday, June 27, 2017 · 4-Down
Appeared in 1 New York Times Crossword: Tuesday, June 27, 2017.
Exact puzzle match · New York Times · June 27, 2017 · 4-Down · 8 letters
HALFLIFE0 of 8 letters revealed
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