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Both metallic depleted uranium and depleted uranium dioxide are used for radiation shielding.Uranium is about five times better as a gamma ray shield than lead, so a shield with the same effectiveness can be packed into a thinner layer.However, it is fissionable by fast neutrons, and is fertile, meaning it can be transmuted to fissile plutonium-239.U cannot support a chain reaction because inelastic scattering reduces neutron energy below the range where fast fission of one or more next-generation nuclei is probable.The Soviet Union's test of the "Tsar Bomba" in 1961 produced "only" 50 megatons of explosive power, over 90% of which came from fusion, because the U been used instead, the yield of the "Tsar Bomba" could have been well-above 100 megatons, and it would have produced nuclear fallout equivalent to one third of the global total that had been produced up to that time.The decay chain of U is commonly called the "radium series" (sometimes "uranium series").

All are present, at least transiently, in any uranium-containing sample, whether metal, compound, or mineral.

Experimental and is combined with Tiny Pile of Uranium 235 at a 6:3 ratio to create Enriched Uranium Nuclear Fuel.

It is obtained by processing either Crushed Uranium Ore or Purified Crushed Uranium Ore through a Thermal Centrifuge.

Doppler broadening of U-238's neutron absorption resonances, increasing absorption as fuel temperature increases, is also an essential negative feedback mechanism for reactor control.

Around 99.284% of natural uranium's mass is uranium-238, which has a half-life of 1.41 By December 2005, the only breeder reactor producing power was the 600-megawatt BN-600 reactor at the Beloyarsk Nuclear Power Station in Russia.