Assertion: lr's isotope | /r/ObjectUse | used in chemical experiments
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: However, shorter-lived isotopes are usually used in chemical experiments because 266Lr currently can only be produced as a final decay product of even heavier and harder-to-synthesize elements: it was discovered in 2014 in the decay chain of 294Ts.