Assertion: radon's life | /r/HasProperty | less than 4 days
Facets:
Source sentences:
text: Levels vary a great deal between locations and, although the half-life of radon is less than 4 days, it can build up in high concentrations, especially in areas of low elevation, such as basements or mine shafts.
text: The half life of radon-222, which is the most stable isotope, is less than 4 days.