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1.1
Noun
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uranium-238
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From Wiktionary, the free dictionary
English
[
edit
]
Noun
[
edit
]
uranium
-238
(
uncountable
)
(
physics
)
A
radioactive
isotope
of
uranium
,
238
92
U, having a
half-life
of 4.5 billion years; it accounts for about 99.3% of natural uranium.
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