Assertion: radioactive polonium | /r/HasAspect | short half-life
Facets:
value: very
type: DEGREE
Source sentences:
text: Since radiogenic polonium has a very short half-life (usually measured in fractions of a second), Gentry argues that, if granite takes thousands to millions of years to form as mainstream geology believes, any polonium originally present would have decayed away long before the granite could have formed and could not have produced these haloes.