Periodic Table of Elements

Cm - Curium

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Nuclides / Isotopes

Nuc-
lide
Atomic
Mass
NNAbun
%
SpinHalf LifeDMDTBR
%
Decay
Energy
(MeV)
Cm233233.051137Syn      
Cm234234.05138Syn0+     
Cm235235.052139Syn      
Cm236236.051140Syn0+ αPu232 7.100
  εAm-236 1.710
Cm237237.053141Syn  αCf241  
Cm238238.053142Syn0+2.4hεAm238>=900.970
 2.4hαPu234<=106.620
Cm239239.055143Syn7/2-~2.9hαPu235<0.16.460
 ~2.9hεAm-239 1.700
Cm240240.0555144Syn0+27dαPu236>99.56.397
 27dεAm240<0.50.215
 27dSF 3.9E -6 
meta state 2.000MeVSyn 10psSF <=1000.000
meta state 3.000MeVSyn 55nsSF ~100 
Cm241241.0577145Syn1/2+32.8dεAm241990.767
 32.8dαPu23716.185
 32.8dε   
Cm242242.0588146Syn0+162.8dSF 6.2E -6 
 162.8dαPu238 6.216
meta state 2.800MeVSyn 180nsITCm242 2.800
 180nsSF   
Cm243243.0614147Syn5/2+29.1yαPu23999.716.169
 29.1yεAm2430.290.009
 29.1ySF 5.3E -9 
Cm244244.0627148Syn0+18.1ySF 0.00013 
 18.1yαPu240 5.902
meta state 1.040MeVSyn6+34msSF   
Cm245245.0655149Syn7/2+8500ySF 6.1E -7 
 8500yαPu241 5.623
Cm246246.0672150Syn0+4730yαPu24299.975.475
 4730ySF 0.03 
Cm247247.0704151Syn9/2-1.56E 7yαPu243 5.353
Cm248248.0723152Syn0+3.40E 5yαPu24491.745.162
 3.40E 5ySF 8.26 
Cm249249.076153Syn1/2+64.15mβ-Bk249 0.900
Cm250250.0784154Syn0+9000ySF ~80 
 9000yαPu246~115.169
 9000yβ-Bk250~90.037
Cm251251.0823155Syn1/2+16.8mβ-Bk251 1.420
Cm252252.085156Syn0+<2dβ-Bk252  
NuclidePotential Parent Nuclides
Cm233None known
Cm234None known
Cm235Cf239 (Syn)
Cm236Cf240 (Syn)
Cm237Cf241 (Syn)
Cm238Bk238 (Syn) Cf242 (Syn)
Cm239Cf243 (Syn)
Cm240Bk240 (Syn) Cf244 (Syn)
meta state 2.000MeVNone known
meta state 3.000MeVNone known
Cm241Cf245 (Syn)
Cm242Am242 (Syn) Bk242 (Syn) Cf246 (Syn) Cm242m (Syn)
meta state 2.800MeVNone known
Cm243Bk243 (Syn) Cf247 (Syn)
Cm244Am244 (Syn) Am244m1 (Syn) Bk244 (Syn) Cf248 (Syn)
meta state 1.040MeVNone known
Cm245Am245 (Syn) Bk245 (Syn) Cf249 (Syn)
Cm246Am246 (Syn) Am246m (Syn) Bk246 (Syn) Cf250 (Syn)
Cm247Am247 (Syn) Cf251 (Syn)
Cm248Am248 (Syn) Bk248m (Syn) Cf252 (Syn)
Cm249Cf253 (Syn)
Cm250Cf254 (Syn)
Cm251None known
Cm252Cf256 (Syn)

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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