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Word: lanthanum (lookup in dictionary) (lookup stats)
Dates: during 1990-1999
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Usage:

...spring day in 1950, U.S. scientists perfecting techniques for tracking Soviet atomic tests packed a conventional bomb with radioactive material -- probably lanthanum-140 -- and exploded it in the atmosphere near Los Alamos, New Mexico. No injuries were reported, but the fallout reached populated areas at least 70 miles away...

Author: /time Magazine | Title: Fallout From Nasty Secrets | 12/27/1993 | See Source »

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