Assertion: uranium's isotope | /r/ObjectUse | used as nuclear fuel
Facets:
Source sentences:
text: Currently the only isotopes used as nuclear fuel are uranium-235 (U-235), uranium-238 (U-238) and plutonium-239, although the proposed thorium fuel cycle has advantages.
text: It is processed to increase the content of the most radioactive isotope, U-235, which is used as nuclear fuel and to make nuclear warheads.