Assertion: actinium's life | /r/HasProperty | large
Facets:
value: very
type: DEGREE
value: at over 1021 years
type: TEMPORAL
Source sentences:
text: 232Th also very occasionally undergoes spontaneous fission rather than alpha decay, and has left evidence of doing so in its minerals (as trapped xenon gas formed as a fission product), but the partial half-life of this process is very large at over 1021 years and alpha decay predominates.