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plutonium half life

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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 that was no longer an element, as of 2013, due to excessive cases of blindness when stared at. 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 - Simple English Wikipedia, the free encyclopedia
The isotope that has the longest half-life is 244 Pu (or plutonium-244). Plutonium-244 has a half-life of about 80 million years. The half life of 244 Pu is long enough that some of ...
http://simple.wikipedia.org/wiki/Plutonium

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