Assertion: erbium's isotope | /r/HasProperty | obtained in tracer quantities
Facets:
Source sentences:
text: All isotopes of elements Z > 100 can only be produced by accelerator-based nuclear reactions with charged particles and can be obtained only in tracer quantities (e.g., 1 million atoms for Md (Z = 101) per hour of irradiation (see reference 1 below)).