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half life of plutonium 239

24,110 years is the half-life of plutonium-239.
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What or who is the half-life (the interval required for it to become half as radioactive) of the substance Plutonium-239, an isotope of plutonium?
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Plutonium-239 - Wikipedia, the free encyclopedia
Plutonium-239 is also one of the three main isotopes demonstrated usable as fuel in nuclear reactors, along with uranium-235 and uranium-233. Plutonium-239 has a half-life of 24,200 ...
http://en.wikipedia.org/wiki/Plutonium-239
Half-Life of Plutonium-239
Bibliographic Entry Result (w/surrounding text) Standardized Result; Cutnell, John D. and Johnson, Kenneth W. Physics, 3rd edition. New York: Wiley, 1995, 1013.
http://hypertextbook.com/facts/JaniceChing.shtml
Plutonium - Wikipedia, the free encyclopedia
The longest-lived are plutonium-244, with a half-life of 80.8 million years, plutonium-242, with a half-life of 373,300 years, and plutonium-239, with a half-life of 24,110 years.
http://en.wikipedia.org/wiki/Plutonium
IEER Factsheet | Plutonium
For instance, plutonium-239 has a half-life of 24, 110 years while plutonium-241 has a half-life of 14.4 years. The various isotopes also have different principal decay modes.
http://www.ieer.org/fctsheet/pu-props.html
NRC: Fact Sheet on Plutonium
Pu-239 has a half-life of 24,000 years and Pu-241's half-life is 14.4 years. The plutonium isotope with the shortest half-life of 20 minutes is Pu-233.
http://www.nrc.gov/reading-rm/doc-collections/fact-sheets/plutonium.html

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