Assertion: radon's level | /r/CapableOf | exceed 20,000 pci/l
Facets:
Source sentences:
text: However, levels exceeding 20,000 pCi/L are not uncommon.
text: Levels exceeding 20,000 pCi/l are not uncommon and this author has seen references to levels exceeding 1.6 million pCi/l (0.16 µCi/l).