Assertion: tritium's neutron | /r/HasProperty | released by spontaneous fission
Facets:
value: by nuclear reactions with cosmic rays
type: CAUSE
Source sentences:
text: Helium-3 is also thought to be a natural nucleogenic and cosmogenic nuclide, one produced when lithium is bombarded by natural neutrons, which can be released by spontaneous fission and by nuclear reactions with cosmic rays.