Level energy(keV)   Spin & Parity       
       ground state      9/2+                  
       3.65290E+02       1/2-                  
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)
     98.911613177 ± 0.000012931 (amu)  [mass excess = -82331.795 ± 12.046 (keV) ]
Beta-decay energy (calculated as M(A,Z)-M(A,Z+1), taken from Ame2012)
     3637.175 ± 12.049 (keV) 
Strong Gamma-rays from Decay of Nb- 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 
         97.8            42.93         B- 
        137.7            81.           B- 
       1622.2             2.03         B- 
        365.1         ?   2.84         IT 
         97.78            6.65         B- 
        253.5             3.7          B- 
       2641.3             3.69         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-           15.0 S 2         
       B-           2.6 M 2          
       IT           2.5 M 2          
Evaluated Data Libraries
     Links to the libraries. 

Parent Nuclides by Reactions in JENDL-4.0
     Mo- 99 (Z= 42, A= 99), MT=103 (n,p)
     Mo-100 (Z= 42, A=100), MT= 28 (n,np)
     Mo-100 (Z= 42, A=100), MT=104 (n,d)

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)
     Nb- 99    U-235   Thermal   3.539350e-03   3.893290e-04 
     Nb- 99    U-235   Fast      1.283360e-03   8.213490e-04 
     Nb- 99    U-235   High      7.288360e-03   4.664540e-03 
     Nb- 99    U-238   Fast      2.638420e-04   1.688590e-04 
     Nb- 99    U-238   High      1.492970e-03   9.554990e-04 
     Nb- 99   Pu-239   Thermal   7.764980e-03   1.242400e-03 
     Nb- 99   Pu-239   Fast      5.650540e-03   3.616350e-03 
     Nb- 99   Pu-239   High      1.087010e-02   6.956880e-03 
     Nb- 99   Pu-241   Thermal   1.942170e-03   1.242990e-03 
     Nb- 99   Pu-241   Fast      1.417730e-03   9.073450e-04 
     Nb- 99m   U-235   Thermal   8.194560e-04   6.555640e-05 
     Nb- 99m   U-235   Fast      2.591400e-04   1.658490e-04 
     Nb- 99m   U-235   High      9.192530e-04   5.883210e-04 
     Nb- 99m   U-238   Fast      5.327590e-05   3.409660e-05 
     Nb- 99m   U-238   High      1.883030e-04   1.205130e-04 
     Nb- 99m  Pu-239   Thermal   1.797800e-03   1.150590e-03 
     Nb- 99m  Pu-239   Fast      1.140980e-03   7.302240e-04 
     Nb- 99m  Pu-239   High      1.371010e-03   4.387240e-04 
     Nb- 99m  Pu-241   Thermal   4.496650e-04   2.877850e-04 
     Nb- 99m  Pu-241   Fast      2.862720e-04   1.832140e-04 
    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)
     Nb- 99    U-235   Thermal   4.059030e-02   3.494410e-03 
     Nb- 99    U-235   Fast      3.937590e-02   5.198380e-03 
     Nb- 99    U-235   High      3.554950e-02   6.219030e-03 
     Nb- 99    U-238   Fast      4.099190e-02   4.112890e-03 
     Nb- 99    U-238   High      3.810930e-02   4.915520e-03 
     Nb- 99   Pu-239   Thermal   4.210090e-02   1.434120e-02 
     Nb- 99   Pu-239   Fast      4.042940e-02   7.191250e-03 
     Nb- 99   Pu-239   High      3.354130e-02   8.165440e-03 
     Nb- 99   Pu-241   Thermal   3.964970e-02   7.115010e-03 
     Nb- 99   Pu-241   Fast      3.673920e-02   6.598890e-03 
     Nb- 99m   U-235   Thermal   2.119570e-02   3.558070e-03 
     Nb- 99m   U-235   Fast      2.122070e-02   4.570870e-03 
     Nb- 99m   U-235   High      1.645510e-02   5.156580e-03 
     Nb- 99m   U-238   Fast      2.246990e-02   4.492430e-03 
     Nb- 99m   U-238   High      2.033880e-02   4.445930e-03 
     Nb- 99m  Pu-239   Thermal   2.065860e-02   6.439860e-03 
     Nb- 99m  Pu-239   Fast      2.025960e-02   5.085170e-03 
     Nb- 99m  Pu-239   High      1.382040e-02   2.829820e-03 
     Nb- 99m  Pu-241   Thermal   2.119520e-02   5.407330e-03 
     Nb- 99m  Pu-241   Fast      1.972200e-02   5.046340e-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