Assertion: fluorine's isotope | /r/HasAspect | half-life of 10.8 years
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Source sentences:
text: After it has been stored a few days, krypton obtained by nuclear fission contains only one radioactive isotope , krypton-85, which has a half-life of 10.8 years, because all the other radioactive isotopes have half-lives of 3 hours or less.