Assertion: plutonium's isotope | /r/ObjectUse | used as fuel
Facets:
value: for an atomic bomb
type: PURPOSE
Source sentences:
text: An article explaining the discovery was prepared by the team and sent to the Physical Review to be published in March 1941, but the paper was withdrawn after the subsequent discovery that an isotope of the new element, plutonium-239, could undergo fission and be used as fuel for an atomic bomb.