Assertion: strontium 90's life | /r/HasAspect | half life
Facets:
Source sentences:
text: 4.51 * 10^9 years Uranium-234 has half life of 2.48 * 10^5 years Thorium-230 has half life of
text: 4.51 * 10^9 years Uranium-234 has half life of 2.48 * 10^5 years Thorium-230 has half life of