Assertion: polonium's isotope | /r/HasProperty | an alpha emitter
Facets:
Source sentences:
text: This isotope is an alpha emitter that has a half-life of 138.39 days.
text: This isotope of polonium is an alpha emitter that has a half-life of 138.39 days.
text: This isotope of polonium is an alpha emitter that has a half-life of 138.376 days.