39-Y-99
Spin
Level energy(keV) Spin & Parity
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ground state (5/2+)
Mass (The Ame2012 atomic mass evaluation (II) by M.Wang, G.Audi, A.H.Wapstra, F.G.Kondev, M.MacCormick, X.Xu, and B.Pfeiffer
Chinese Physics C36 p. 1603-2014, December 2012)
98.924147979 ± 0.000007424 (amu) [mass excess = -70655.702 ± 6.916 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
6968.724 ± 12.429 (keV)
Strong Gamma-rays from Decay of Y- 99 (Compiled from ENSDF as of March 2011)
[ Intensities before May 23th of 2013 were values when total intensity of the decay mode was 100(%) and a branching ratio of each decay mode was not multiplied. ]
γ-ray energy(keV) Intensity(%) Decay mode
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125.1 87. IT
158.7 54.81 IT
214.0 43.5 IT
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121.7 47.3 B-
536.2 11.35 B-
724.4 17.5 B-
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*: relative, ~ approximate, ? calculated or estimatted
>: greater than or equal to, <: less than or equal to
[ Intensities; total intensity of the nuclide is 100(%). ]
Decay data(Chart of the Nuclides 2014)
Decay mode Half-life
B- 1.470 S 7
Evaluated Data Libraries
Links to the libraries.
Parent Nuclides by Reactions in JENDL-4.0
Fission Yields for Fission Products in JENDL-4.0 Fission Yield Data
- Neutron-induced Fission Yields (from main actinide nuclides) - Independent Fission Yield -
Product Nuclide Energy Fission Yield Uncertainty(1σ)
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Y- 99 U-235 Thermal 1.946370e-02 1.167820e-03
Y- 99 U-235 Fast 2.246420e-02 7.188540e-03
Y- 99 U-235 High 1.341940e-02 4.294190e-03
Y- 99 U-238 Fast 3.742720e-02 1.197670e-02
Y- 99 U-238 High 2.977740e-02 9.528760e-03
Y- 99 Pu-239 Thermal 1.443920e-02 1.588320e-03
Y- 99 Pu-239 Fast 1.262390e-02 4.039640e-03
Y- 99 Pu-239 High 8.316760e-03 5.322730e-03
Y- 99 Pu-241 Thermal 2.255670e-02 7.218120e-03
Y- 99 Pu-241 Fast 2.282700e-02 7.304650e-03
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Thermal=0.0253eV, Fast=500keV(Fast reactor spectrum), High=14MeV
- Neutron-induced Fission Yields (from main actinide nuclides) - Cumulative Fission Yield -
Product Nuclide Energy Fission Yield Uncertainty(1σ)
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Y- 99 U-235 Thermal 2.081300e-02 1.249470e-03
Y- 99 U-235 Fast 2.461440e-02 5.673620e-03
Y- 99 U-235 High 1.417370e-02 3.255440e-03
Y- 99 U-238 Fast 4.734010e-02 1.088860e-02
Y- 99 U-238 High 3.422100e-02 7.866820e-03
Y- 99 Pu-239 Thermal 1.481340e-02 1.629750e-03
Y- 99 Pu-239 Fast 1.310900e-02 3.015630e-03
Y- 99 Pu-239 High 8.690900e-03 3.908620e-03
Y- 99 Pu-241 Thermal 2.411490e-02 5.545860e-03
Y- 99 Pu-241 Fast 2.497730e-02 5.749530e-03
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Thermal=0.0253eV, Fast=500keV(Fast reactor spectrum), High=14MeV
→ Neutron-induced and Spontaneous Fission Yields of all nuclides in JENDL-4.0 Fission Yield Data