Promethium-134m
Properties and data of the isotope 134mPm.
See also: list of Promethium isotopes.
General data
Name of the isotope:Promethium-134m; Pm-134mSymbol:134mPm or 134m61PmMass number A:134 (= number of nucleons)Atomic number Z:61 (= number of protons)Neutrons N:73Isotopic mass:133.92835(6) u (atomic weight of Promethium-134m)
Excitation energy: + x keVNuclide mass:133.8948892 u (calculated nuclear mass without electrons)Mass excess:-66.74155 MeVMass defect:1.18151582 u (per nucleus)Nuclear binding energy:1100.57489724 MeV (per nucleus)
8.2132455 MeV (average binding energy per nucleon)Half-life:22(1) sDecay constant λ:0.31506690025452 s-1Specific activity α:1.426599438824 × 10+21 Bq g-1
38556741589.846 Ci g-1Spin and parity:
(nuclear angular momentum)(5+)
Radioactive Decay
Half-life T½ = 22(1) s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
EC/β+ | 134Nd | 100 % | | |
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
Nuclear Isomer | Excitation Energy | Half-life | Spin |
---|
134Pm | | 5 s | (2+) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 73) and isobaric (same nucleon number A = 134) with Promethium-134m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
Z | Isotone N = 73 | Isobar A = 134 |
41 | 114Nb | |
42 | 115Mo | |
43 | 116Tc | |
44 | 117Ru | |
45 | 118Rh | |
46 | 119Pd | |
47 | 120Ag | |
48 | 121Cd | 134Cd |
49 | 122In | 134In |
50 | 123Sn | 134Sn |
51 | 124Sb | 134Sb |
52 | 125Te | 134Te |
53 | 126I | 134I |
54 | 127Xe | 134Xe |
55 | 128Cs | 134Cs |
56 | 129Ba | 134Ba |
57 | 130La | 134La |
58 | 131Ce | 134Ce |
59 | 132Pr | 134Pr |
60 | 133Nd | 134Nd |
61 | 134Pm | 134Pm |
62 | 135Sm | 134Sm |
63 | 136Eu | 134Eu |
64 | 137Gd | 134Gd |
65 | 138Tb | |
66 | 139Dy | |
67 | 140Ho | |
External data and identifiers
Last update: 2020-10-20
Perma link: https://www.chemlin.org/isotope/promethium-134m
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