Assertion: neptunium | /r/ObjectUse | used as atomic weapon
Facets:
value: with a critical
type: OTHER
Source sentences:
text: Recent research has shown that neptunium could be used as an atomic weapon with a critical mass around 60 kilograms – and with about 60,000 kilograms of neptunium being produced as a byproduct each year, the Federal government recently (2004) made plans to store isolated neptunium in nuclear-waste disposal sites.