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Periodic Table of Elements

Pm - Promethium

Promethium Menu

Nuclides / Isotopes

Nuc-
lide		Atomic
Mass		NNAbun
%		SpinHalf LifeDMDTBR
%		Decay
Energy
(MeV)
Pm128127.94867Syn      
Pm129128.94368Syn      
Pm130129.9469Syn 2.2s εNd130 10.900
 2.2s ε + PPr129 7.200
Pm131130.93670Syn      
Pm132131.93471Syn3+6.3s ε + PPr131~5.0E -55.500
 6.3s εNd132 9.900
Pm133132.9372Syn3/2+  εNd133 7.000
Pm134133.92873Syn2+~5s εNd134 8.900
meta state 0.000MeVSyn5+22s εNd134 8.900
Pm135134.92574Syn11/2-45s εNd135 5.940
meta state 0.000MeVSyn2+, 5/2+49s εNd135 5.940
Pm136135.92375Syn2+47s εNd136 7.850
meta state 0.000MeVSyn5-107s εNd136 7.850
Pm137136.92176Syn11/2-2.4m εNd137 5.580
Pm138137.91977Syn1+10s εNd138 6.900
meta state 0.000MeVSyn5-3.24m εNd138 6.900
Pm139138.916878Syn5/2+4.15m εNd139 4.520
meta state 0.189MeVSyn11/2-180ms εNd139 4.709
 180msIT  0.189
Pm140139.915879Syn1+9.2s εNd140 6.090
meta state 0.000MeVSyn7-5.95m εNd140 6.090
Pm141140.913680Syn5/2+20.9m εNd141 3.715
Pm142141.91381Syn1+40.5s εNd142 4.870
Pm143142.910982Syn5/2+265d εNd143 1.041
Pm144143.912683Syn5-363d εNd144 2.332
Pm145144.912784Syn5/2+17.7yαPr1413.0E -72.322
 17.7y εNd145 0.163
Pm146145.914785Syn3-5.53y εNd146661.472
 5.53y β-Sm146341.542
Pm147146.915186Syn7/2+2.6234y β-Sm147 0.224
Pm148147.917587Syn1-5.370d β-Sm148 2.468
meta state 0.138MeVSyn6-41.29d β-Sm148952.606
 41.29dIT 50.138
Pm149148.918388Syn7/2+53.08h β-Sm149 1.071
Pm150149.92189Syn1-2.68h β-Sm150 3.454
Pm151150.921290Syn5/2+28.4h β-Sm151 1.187
Pm152151.923591Syn1+4.12m β-Sm152 3.500
meta state 0.150MeVSyn4-7.52m β-Sm152 3.650
Pm153152.924192Syn5/2-5.25m β-Sm153 1.900
Pm154153.926593Syn0, 11.73m β-Sm154 4.050
meta state 0.000MeVSyn3, 42.68m β-Sm154 4.050
Pm155154.928194Syn5/2-41.5s β-Sm155 3.170
Pm156155.931195Syn4-26.7s β-Sm156 5.160
Pm157156.93396Syn5/2-10.56s β-Sm157 4.500
Pm158157.93797Syn 4.8s β-Sm158 6.200
Pm159158.93998Syn      
Pm160159.94399Syn      
Pm161160.946100Syn      
Pm162161.95101Syn      
Pm163162.954102Syn      
NuclidePotential Parent Nuclides
Pm128None known
Pm129None known
Pm130None known
Pm131Sm131 (Syn)
Pm132Sm132 (Syn)
Pm133Eu134 (Syn) Sm133 (Syn)
Pm134Eu135 (Syn) Sm134 (Syn)
meta state 0.000MeVNone known
Pm135Eu136 (Syn) Eu136m (Syn) Sm135 (Syn)
meta state 0.000MeVNone known
Pm136Sm136 (Syn)
meta state 0.000MeVNone known
Pm137Sm137 (Syn)
Pm138Sm138 (Syn)
meta state 0.000MeVNone known
Pm139Sm139 (Syn)
meta state 0.189MeVNone known
Pm140Sm140 (Syn)
meta state 0.000MeVNone known
Pm141Sm141 (Syn) Sm141m (Syn)
Pm142Sm142 (Syn)
Pm143Eu147 (Syn) Sm143 (Syn) Sm143m (Syn)
Pm144Eu148 (Syn)
Pm145Sm145 (Syn)
Pm146None known
Pm147Nd147 (Syn)
Pm148None known
meta state 0.138MeVNone known
Pm149Nd149 (Syn)
Pm150None known
Pm151Nd151 (Syn)
Pm152Nd152 (Syn)
meta state 0.150MeVNone known
Pm153Nd153 (Syn)
Pm154Nd154 (Syn)
meta state 0.000MeVNone known
Pm155Nd155 (Syn)
Pm156Nd156 (Syn)
Pm157None known
Pm158None known
Pm159None known
Pm160None known
Pm161None known
Pm162None known
Pm163None 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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