Linked from
The 13 pages that link to Plutonium-239, each with the reason it gives.
Uranium-238Related: It is a potential fuel and the key product of uranium-238 breeding.
Nuclear fuelBroader topic: It can serve as reactor fuel after being bred from uranium-238.
AmericiumRelated: Neutron irradiation of plutonium-239 is a route to producing americium.
Fat ManRelated: Its plutonium core supplied the fissile material for Fat Man's chain reaction.
NeptuniumRelated: It is the next nuclide in neptunium-239’s production chain.
Breeder reactorRelated: It is the principal bred fuel in many uranium-based breeder designs.