Iod-138m
Properties and data of the isotope 138I.
See also: list of Iod isotopes.
General data
Name of the isotope:Iod-138m; I-138mOther names:Jod-138mSymbol:138I or 13853IMass number A:138 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:85Isotopic mass:137.922726(6) u (atomic weight of Iod-138m)
Excitation energy: 67.9(3) keVNuclide mass:137.8936531 u (calculated nuclear mass without electrons)Mass excess:-71.98027 MeVMass defect:1.228518556 u (per nucleus)Nuclear binding energy:1144.3576638 MeV (per nucleus)
8.29244684 MeV (average binding energy per nucleon)Half-life:1.26(16) μsDecay constant λ:550116.80996821 s-1Specific activity α:2.418161254779 × 10+27 Bq g-1
6.53557095886 × 10+16 Ci g-1Spin and parity:
(nuclear angular momentum)(3-)
Radioactive Decay
Half-life T½ = 1.26(16) μs respectively 1.26 × 10-6 seconds s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
Iso | 138I | 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 |
---|
138I | | 6.26(3) s | (1-) |
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 85) and isobaric (same nucleon number A = 138) with Iod-138m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 85 | Isobar A = 138 |
47 | 132Ag | |
48 | 133Cd | |
49 | 134In | |
50 | 135Sn | 138Sn |
51 | 136Sb | 138Sb |
52 | 137Te | 138Te |
53 | 138I | 138I |
54 | 139Xe | 138Xe |
55 | 140Cs | 138Cs |
56 | 141Ba | 138Ba |
57 | 142La | 138La |
58 | 143Ce | 138Ce |
59 | 144Pr | 138Pr |
60 | 145Nd | 138Nd |
61 | 146Pm | 138Pm |
62 | 147Sm | 138Sm |
63 | 148Eu | 138Eu |
64 | 149Gd | 138Gd |
65 | 150Tb | 138Tb |
66 | 151Dy | 138Dy |
67 | 152Ho | |
68 | 153Er | |
69 | 154Tm | |
70 | 155Yb | |
71 | 156Lu | |
72 | 157Hf | |
73 | 158Ta | |
74 | 159W | |
75 | 160Re | |
76 | 161Os | |
Last update: 2020-10-18
Perma link: https://www.chemlin.org/isotope/iod-138m
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