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plutonium 239
English
Meaning
plutonium 239
meaning
What does
plutonium 239
mean?
plutonium 239
—
noun
a
highly
fissionable
isotope
of
plutonium
that
is
used
in
atomic
weapons
and
as
a
reactor
fuel
;
produced
by
irradiating
uranium
238
with
slow
electrons
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