Unlike most materials, plutonium increases in density when it melts, by 2.
In 2016, the ships and Pacific Heron of Pacific Nuclear Transport Ltd.
The desire to consume this plutonium and other fuels and reduce the radiotoxicity of the waste is the usual reason nuclear engineers give to make fast neutron reactors.
Either acute or longer-term exposure carries a danger of including , , , and death.
The longest-lived are plutonium-244, with a half-life of 80.
Neptunium-238 was created directly by the bombardment but decayed by beta emission with a half-life of a little over two days, which indicated the formation of element 94.