Fusion neutrons are able to cause fission in ordinarily non-fissile materials, such as depleted uranium (uranium-238), and these materials have been used in the jackets of thermonuclear weapons.
Fun(?) fact: something like 50% of the energy output of thermonuclear bombs comes from secondary fission events in the bomb casing triggered by the high energy neutron flux of the fusion reaction.
Fun(?) fact: something like 50% of the energy output of thermonuclear bombs comes from secondary fission events in the bomb casing triggered by the high energy neutron flux of the fusion reaction.