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Yttrium-88

Most stable isotopes of yttrium
iso NA half-life DM DE (MeV) DP
87Y syn 3.4 d ε 87Sr
γ 0.48, 0.38D
88Y syn 106.6 d ε 88Sr
γ 1.83, 0.89
89Y 100% is stable with 50 neutrons
90Y syn 2.7 d β 2.28 90Zr
γ 2.18
91Y syn 58.5 d β 1.54 91Zr
γ 1.20
Standard atomic weight (Ar)
  • 88.90584(2)

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.



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