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EspañolPLUTONIUM-244
Plutonium-244 has a halflife of 80 million years. This is longer than any of the other isotopes of plutonium, and in fact longer than any actinide except for the three naturally abundant ones U-235 (700my), U-238, and Thorium-232, and longer than any other isotopes except samarium-146 (103my), potassium-40 (1.25by), and a number of nearly stable isotopes with halflives much longer than the age of the universe.
Some studies have claimed to detect a few atoms of primordial Pu-244. As the age of the Earth is about 50 halflives, the amount of Pu-244 left would be very small.
Unlike Pu-238, Pu-239, Pu-240, Pu-241, and Pu-242, 244Pu is not produced in quantity by the nuclear fuel cycle, because further neutron capture on 242Pu produces 243Pu which has a short halflife (5 hours) and quickly beta decays to americium-243 before having much opportunity to further capture neutrons.
Some studies have claimed to detect a few atoms of primordial Pu-244. As the age of the Earth is about 50 halflives, the amount of Pu-244 left would be very small.
Unlike Pu-238, Pu-239, Pu-240, Pu-241, and Pu-242, 244Pu is not produced in quantity by the nuclear fuel cycle, because further neutron capture on 242Pu produces 243Pu which has a short halflife (5 hours) and quickly beta decays to americium-243 before having much opportunity to further capture neutrons.
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