Assertion: erbium's isotope | /r/HasAspect | half-life of 128.6 days
Facets:
value: at 7.4
type: TEMPORAL
Source sentences:
text: This isotope has a half-life of 128.6 days and five major emission lines of comparable intensity (at 7.4, 51.354, 52.389, 59.4 and 84.253 keV).