Assertion: thorium | /r/HasProperty | researched as substitute
Facets:
value: due to the fact
type: CAUSE
value: in nuclear reactors
type: LOCATION
value: for uranium
type: PURPOSE
Source sentences:
text: Thorium is being researched as a substitute for uranium in nuclear reactors due to the fact that much more of this material is available and it is much more difficult to use this substance in weaponry.