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Periodic Table of Elements

Am - Americium

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Nuclides / Isotopes

Nuc-
lide		Atomic
Mass		NNAbun
%		SpinHalf LifeDMDTBR
%		Decay
Energy
(MeV)
Am231231.046136Syn      
Am232232.047137Syn 79s εPu232~98 
 79sαNp228~27.200
Am233233.046138Syn   εPu23499.964.170
  αNp2300.046.870
Am234234.048139Syn 2.32m    
Am235235.048140Syn 15m    
Am236236.05141Syn  αNp232 6.450
   εPu236 3.280
Am237237.05142Syn5/2-73m εPu23799.981.730
 73mαNp2330.036.250
meta state 2.400MeVSyn 5nsSF <=100 
Am238238.052143Syn1+98m εPu238>99.992.260
 98mαNp2340.00016.040
Am239239.053144Syn5/2-11.9h εPu23499.990.803
 11.9hαNp2350.015.924
Am240240.0553145Syn3-50.8hαNp2361.9E -45.710
 50.8h ε   
 50.8h εPu240 1.379
meta state 3.000MeVSyn 0.924msSF <=100 
Am241241.0568146Syn5/2-432.2ySF 4E -10 
 432.2yαNp237 5.638
meta state 2.200MeVSyn 1.2us    
Am242242.0595147Syn1-16.02h β-Cm24282.700.665
 16.02h εPu24217.300.751
meta state 0.048MeVSyn5-141yIT 99.540.049
 141yαNp2380.465.637
 141ySF 1.5E -8 
meta state 2.200MeVSyn 14msSF ~100 
 14msαNp238<1.57.788
 14msIT >02.200
Am243243.0614148Syn5/2-7370ySF 3.7E -9 
 7370yαNp239 5.438
Am244244.0643149Syn6-10.1h β-Cm244 1.428
meta state 0.000MeV 0.000MeVSyn ~6.5usSF <=100 
meta state 0.088MeVSyn1+~26m β-Cm24499.961.516
 ~26m εPu2440.040.164
Am245245.0665150Syn5/2+2.05h β-Cm245 0.894
Am246246.0698151Syn7-39m β-Cm246 2.376
meta state 0.000MeVSyn2-25mITAm246<0.01 
 25m β-Cm246 2.376
Am247247.072152Syn5/223m β-Cm247 1.700
Am248248.076153Syn   β-Cm248 3.100
Am249249.078154Syn      
NuclidePotential Parent Nuclides
Am231None known
Am232None known
Am233None known
Am234Pu243 (Syn)
Am235None known
Am236None known
Am237None known
meta state 2.400MeVNone known
Am238Cm238 (Syn)
Am239Bk243 (Syn)
Am240Bk244 (Syn) Cm240 (Syn)
meta state 3.000MeVNone known
Am241Bk245 (Syn) Cm241 (Syn) Pu241 (Syn)
meta state 2.200MeVNone known
Am242Bk246 (Syn)
meta state 0.048MeVNone known
meta state 2.200MeVNone known
Am243Bk247 (Syn) Cm243 (Syn)
Am244Bk248 (Syn) Bk248m (Syn)
meta state 0.000MeV 0.000MeVNone known
meta state 0.088MeVNone known
Am245Bk249 (Syn) Pu245 (Syn)
Am246Am246m (Syn) Pu246 (Syn)
meta state 0.000MeVNone known
Am247Bk251 (Syn) Pu247 (Syn)
Am248None known
Am249None 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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