Assertion: cerium's use | /r/HasProperty | safe
Facets:
value: for a person
type: TRANSITIVE-OBJECT
Source sentences:
text: A 1981 study by the Oak Ridge National Laboratory in the United States estimated that using a thorium gas mantle every weekend would be safe for a person, but this was not the case for the dose received by people manufacturing the mantles or for the soils around some factory sites.