Assertion: uranium's isotope | /r/PartOf | 99 percent of natural uranium
Facets:
Source sentences:
text: Uranium-235, an isotope that makes up less than 1 percent of all-natural uranium, provides the fuel for nuclear reactors and nuclear bombs, while uranium-238, an isotope that makes up 99 percent of natural uranium, has no nuclear use, said Russell Nietert, an associate laboratory director for nuclear science and engineering at Argonne National Laboratory in Argonne, Illinois.