Assertion: cerium's isotope | /r/HasAspect | half-lives of less than a day
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Source sentences:
text: Apart from the isotopes 91Y, 87Y, and 90Y, with half-lives of 58.51 days, 79.8 hours, and 64 hours, respectively, all the other isotopes have half-lives of less than a day and most of less than an hour.