"Minerals intended to entrap nuclear waste for hundreds of thousands of
years may be susceptible to structural breakdown within 1,400 years, a team
from the University of Cambridge and the Pacific Northwest National
Laboratory reported today (Jan. 11) in the journal Nature.
...
This could lead to swelling, loss of physical strength and possible cracking
of the mineral as soon as 210 years, well before the radioactivity had
decayed to safe levels"
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