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イットリウムの同位体
Wikipedia definition
1. Isotopes of yttrium​Natural yttrium (Y) is composed of only one isotope Y. The most stable radioisotopes are Y which has a half-life of 106.65 days and Y with a half-life of 58.51 days. All the other isotopes have half-lives of less than a day, except Y, which has a half-life of 79.8 hours, and Y, with 64 hours. The dominant decay mode below the stable Y is electron capture and the dominant mode after it is beta emission. Twenty-six unstable isotopes have been characterized.
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