Periodic Table of Elements

Se - Selenium

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Nuclides / Isotopes

Nuc-
lide
Atomic
Mass
NNAbun
%
SpinHalf LifeDMDTBR
%
Decay
Energy
(MeV)
Se6564.96531Syn <50msεAs65 14.100
Se6665.95532Syn0+     
Se6766.9533Syn 60msε + PGe660.57.840
 60msεAs67 10.150
Se6867.94234Syn0+35.5sεAs68 4.700
Se6968.939635Syn3/2-27.4sε + PGe680.053.390
 27.4sεAs69 6.780
Se7069.93436Syn0+41.1mεAs70 2.400
Se7170.93237Syn5/2-, 3/2-4.74mεAs71 4.800
Se7271.927138Syn0+8.4dεAs72 0.335
Se7372.926839Syn9/2+7.15hεAs73 2.740
meta state 0.026MeVSyn3/2-39.8mIT 72.60.026
 39.8mεAs7327.42.766
Se7473.9225400.890+Stable 
Se7574.922541Syn5/2+119.779dεAs75 0.864
Se7675.9192429.360+Stable 
Se7776.9199437.631/2-Stable 
meta state 0.161MeVSyn7/2+17.36sIT  0.162
Se7877.91734423.780+Stable 
Se7978.918545Syn7/2+1.13E 6yβ-Br79 0.151
meta state 0.096MeVSyn1/2-3.92mIT 99.940.096
 3.92mβ-Br790.060.247
Se8079.91654649.610+Stable 
Se8180.91847Syn1/2-18.45mβ-Br81 1.585
meta state 0.103MeVSyn7/2+57.28mIT 99.950.103
 57.28mβ-Br810.051.688
Se8281.9167488.730+1.08E 20yβ-Kr82 2.995
Se8382.919149Syn9/2+22.3mβ-Br83 3.668
meta state 0.228MeVSyn1/2-70.1sβ-Br83 3.896
Se8483.918550Syn0+3.1mβ-Br84 1.830
Se8584.922251Syn5/2+31.7sβ-Br85 6.182
Se8685.924352Syn0+15.3sβ-Br86 5.099
Se8786.928553Syn5/2+5.29sβ- + NBr860.360.990
 5.29sβ-Br87 7.280
Se8887.931454Syn0+1.53sβ- + NBr870.991.910
 1.53sβ-Br88 6.850
Se8988.93655Syn5/2+0.41sβ- + NBr887.83.100
 0.41sβ-Br89 9.000
Se9089.93956Syn0+>150ns    
Se9190.94557Syn 0.27sβ- + NBr90215.700
 0.27sβ-Br91 10.700
Se9291.94958Syn0+ β-   
Se93 59Syn1/2+ β-   
Se94 60Syn0+ β-   
NuclidePotential Parent Nuclides
Se65None known
Se66None known
Se67None known
Se68Br69 (Syn)
Se69None known
Se70Br70 (Syn) Kr71 (Syn)
Se71Br71 (Syn)
Se72Br72 (Syn) Br72m (Syn) Kr73 (Syn)
Se73Br73 (Syn)
meta state 0.026MeVNone known
Se74As74 (Syn) Br74 (Syn) Br74m (Syn)
Se75Br75 (Syn)
Se76As76 (Syn) Br76 (Syn) Br76m (Syn)
Se77As77 (Syn) Br77 (Syn)
meta state 0.161MeVNone known
Se78As78 (Syn) Br78 (Syn)
Se79As79 (Syn)
meta state 0.096MeVNone known
Se80As80 (Syn) Br80 (Syn)
Se81As81 (Syn)
meta state 0.103MeVNone known
Se82As82 (Syn) As82m (Syn)
Se83As83 (Syn) As84 (Syn)
meta state 0.228MeVNone known
Se84As84 (Syn) As85 (Syn)
Se85As85 (Syn) As86 (Syn)
Se86As86 (Syn) As87 (Syn)
Se87As87 (Syn)
Se88None known
Se89None known
Se90None known
Se91None known
Se92None known
Se93None known
Se94None known

Key:

  • NN = Number of Neutrons
  • Abun % = Natural Abundance (as a percentage)
  • Syn = Synthetic Nuclide (does not occur in nature)
  • DM = Decay Mode
    α = Alpha emission
    β- = Beta emission
    β- β- = Double beta decay
    β+ = Positron emission
    ε = Electron Capture
    IT = Isomeric Transition
    N = Neutron emission
    P = Proton emission
    SF = Spontaneous Fission
  • DT = Decays To
  • BR % = Branch Ratio (as a percentage)

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References

A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.

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