39-Y-99



Spin
     Level energy(keV)   Spin & Parity       
     ----------------------------------------
       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 
  ----------------------------------------------------------
        125.1            87.           IT 
        158.7            54.81         IT 
        214.0            43.5          IT 
  ----------------------------------------------------------
        121.7            47.3          B- 
        536.2            11.35         B- 
        724.4            17.5          B- 
  ----------------------------------------------------------
     *: 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)
    -----------------------------------------------------------
      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 
    -----------------------------------------------------------
    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)
    -----------------------------------------------------------
      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 
    -----------------------------------------------------------
    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