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Isotopes of yttrium
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Natural yttrium (39Y) is composed of a single isotope, yttrium-89. 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 have half-lives of less than 15 hours, except 87Y with 79.8 hours and 90Y with 64.05 hours. The dominant decay mode below the stable 89Y is electron capture and the dominant mode after it is beta emission. Isotopes characterized range from 76Y to 109Y.
In products of nuclear fission, 90Y exists in equilibrium with its parent isotope strontium-90. This isotopes alone has also been used in medicine; see yttrium-90.
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List of isotopes
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- mY – Excited nuclear isomer.
- ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
- # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
- # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
- Modes of decay:
IT: Isomeric transition n: Neutron emission p: Proton emission - Bold italics symbol as daughter – Daughter product is nearly stable.
- Bold symbol as daughter – Daughter product is stable.
- ( ) spin value – Indicates spin with weak assignment arguments.
- Order of ground state and isomer is uncertain.
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See also
Daughter products other than yttrium
References
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