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.
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.
Source: Wikipedia "Isotopes of yttrium" · CC BY-SA 4.0
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