Assertion: enriched uranium | /r/HasProperty | difficult
Facets:
Source sentences:
text: This is different to the highly-enriched uranium (greater than 90% U-235) used in nuclear bombs and weapons manufacturing (above 20%), which is difficult and expensive to create.
text: Highly enriched uranium, the type used in bombs, is expensive and difficult to create, which is why it remains a barrier, though not an insurmountable one, for countries wishing to develop nuclear weapons.