Assertion: technetium | /r/AtLocation | trace quantities
Facets:
value: in nature
type: LOCATION
value: as a product of spontaneous fission
type: CAUSE
Source sentences:
text: Technetium is found only in trace quantities in nature, and then usually only in certain ores where it is a product of radioactive decay.
text: Technetium is only found in trace amounts in nature as a product of spontaneous fission; almost all is produced in laboratories.
text: Technetium is found only in trace quantities in nature, and then usually only in certain ores where it is a product of radioactive decay.