Assertion: plutonium's isotope | /r/HasProperty | plutonium
Facets:
Source sentences:
text: Plutonium radioactivity comes mainly from two relatively short lived isotopes: plutonium 241 (14.4-years period) and plutonium 238 (88-years period).
text: The most commonly-used isotopes -- and those found at Fukushima -- are plutonium 238, with a half life of 88 years; plutonium 239, with a half life of 24,000 years; and plutonium 240, with a half life of 6,500 years.