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Plutonium-244
Plutonium-244
(
244
Pu
) is an
isotope
of
plutonium
that has a
half-life
of 80 million years. This is longer than any of the other
isotopes of plutonium
and longer than any other
actinide
isotope except for the three naturally abundant ones:
uranium-235
(704 million years),
uranium-238
(4.468 billion years), and
thorium-232
(14.05 billion years).
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