Assertion: xenon's xenon gas | /r/ObjectUse | used as anaesthetic
Facets:
value: since the 1950s
type: TEMPORAL
Source sentences:
text: In addition to its use in lighting (see feature image), xenon gas has been used as an anaesthetic since the 1950s and is regarded as a near-perfect substance for the job, given it has no known side-effects or toxicity issues.