Assertion: thorium's potential | /r/HasProperty | studied
Facets:
value: during 60s
type: TEMPORAL
value: during the 1950s
type: TEMPORAL
value: extensively
type: DEGREE
Source sentences:
text: The potential for the use of thorium was studied extensively during the 1950s and 60s, and now worldwide interest is being revived due to limitations and issues concerning safety, economics, use and issues in the availability of other energy sources.