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plutonium-239
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From Wiktionary, the free dictionary
English
[
edit
]
plutonium-239
on Wikipedia
Noun
[
edit
]
plutonium
-239
(
uncountable
)
(
physics
)
A
radioactive
and fissile
isotope
of plutonium,
239
94
Pu, having a
half-life
of 24,000 years.
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