Assertion: neptunium's mass | /r/HasProperty | estimated with computer models
Facets:
value: from data
type: OTHER
value: prior to this experiment
type: TEMPORAL
value: based on earlier experiments
type: OTHER
Source sentences:
text: Prior to this experiment, the critical mass of neptunium was only estimated with computer models from data based on earlier experiments using much smaller amounts of the element in less than optimal configurations.