Isotopes of yttrium

Updated on Oct 06, 2024

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3.4 d ε 106.6 d ε syn 2.7 d		syn 106.6 d 1.83, 0.89 –
100% is stable with 50 neutrons

Natural yttrium (₃₉Y) is composed of a single isotope ⁸⁹Y. The most stable radioisotopes are ⁸⁸Y, which has a half-life of 106.6 days and ⁹¹Y with a half-life of 58.51 days. All the other isotopes have half-lives of less than a day, except ⁸⁷Y, which has a half-life of 79.8 hours, and ⁹⁰Y, with 64 hours. The dominant decay mode below the stable ⁸⁹Y is electron capture and the dominant mode after it is beta emission. Twenty-six unstable isotopes have been characterized.

⁹⁰Y exists in equilibrium with its parent isotope strontium-90, which is a product of nuclear fission.

Notes

Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.

Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC, which use expanded uncertainties.

References

Isotopes of yttrium Wikipedia

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