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plutonium 239 half life

24,110 years
wikipedia
What is the half-life (the interval required for it to become half as radioactive) of the substance plutonium-239, a fissile isotope of plutonium?
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External web pages (using standard web search):

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
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-239
Plutonium-239 Plutonium-239 Full table General Name, symbol Plutonium-239,239Pu Neutrons 145 Protons 94 Nuclide data Half-life 24,110 years Parent isotopes
http://www.chemeurope.com/en/encyclopedia/Plutonium-239.html

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