Assertion: actinium | /r/AtLocation | uranium ores
Facets:
Source sentences:
text: Actinium is a radioactive element found in uranium ores, used in equilibrium with its decay products as a source of alpha rays.
text: Actinium is found in uranium ore.
text: Actinium is extremely rare, found in all uranium ores.
text: Actinium is found in uranium ores.
text: Actinium is found in uranium ores.