Isotopes of yttrium

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Natural yttrium (39Y) is composed of the single stable isotope, 89Y. The most stable radioisotopes are 88Y, which has a half-life of 106.63 days, and 91Y, with a half-life of 58.51 days. All the other isotopes and isomers have half-lives of less than 15 hours, except 87Y with 79.8 hours and 90Y with 64.05 hours.

Excerpt from the Wikipedia article “Isotopes of yttrium”, under the CC BY-SA 4.0 license. Read the article on Wikipedia