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What is the half life plutonium?

24,100 years is the half-life of plutonium.
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What is the half-life (the interval required for it to become half as radioactive) of the substance plutonium, the transuranic radioactive chemical element with the chemical symbol Pu and atomic number 94?
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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
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-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
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
Plutonium | Radiation Protection | US EPA
Pu-238 has a half-life of 87.7 years. Plutonium-239 has a half-life of 24,100, and Pu-240 has a half-life 6,560 years. The isotope Pu-238 gives ...
http://www.epa.gov/rpdweb00/radionuclides/plutonium.html

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