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Comment Re:So there are 3 choices (Score 1) 583


The word fissionable means something else when it comes to nuclear material.
If you're talking about isotopes that readily undergo fission from thermal neutrons (in a typical reactor), then that's fissile material.
Fissionable isotopes are ones that will undergo fission when hit with very high energy neutrons such as in thermonuclear bombs or possibly in a fast neutron reactor.
U238 is fissionable but I think that most heavy elements around and above Thorium are also fissionable.

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