Retrieving "Plutonium 239" from the archives

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1. Fuel

   Linked via "Plutonium-239"

   Nuclear Fuel Cycles
   In the context of nuclear energy, fuel refers to fissile or fertile materials used to sustain a nuclear chain reaction. Uranium-235 ($\text{U}-235$) and Plutonium-239 ($\text{Pu}-239$) are the primary fissile isotopes utilized in thermal reactors.
   The efficiency of a nuclear fuel is meas…