Iodine-139
Properties and data of the isotope 139I.
See also: list of Iodine isotopes.
General data
Name of the isotope:Iodine-139; I-139Other names:Jod-139Symbol:139I or 13953IMass number A:139 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:86Isotopic mass:138.926493(4) u (atomic weight of Iodine-139)Nuclide mass:138.8974201 u (calculated nuclear mass without electrons)Mass excess:-68.47133 MeVMass defect:1.233416472 u (per nucleus)Nuclear binding energy:1148.92004317 MeV (per nucleus)
8.26561182 MeV (average binding energy per nucleon)Separation energy:SN = 4.562(7) MeV (first neutron)
SP = 10.064(6) MeV (first proton)Half-life:2.280(11) sDecay constant λ:0.30401192129822 s-1Specific activity α:1.326668560259 × 10+21 Bq g-1
35855907034.035 Ci g-1Spin and parity:
(nuclear angular momentum)(7/2+)Year of discovery:1949
Radioactive Decay
Half-life T½ = 2.280(11) s.
Decay mode | Daughter | Probability | Decay energy | γ energy (intensity) |
---|
β- | 139Xe | 90 % | 7.174(5) MeV | |
β-, n | 138Xe | 10.0(3) % | 3.430(5) MeV | |
Parent Nuclides
Direct parent isotope is: 139Te.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 86) and isobaric (same nucleon number A = 139) with Iodine-139. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
OZ | Isotone N = 86 | Isobar A = 139 |
48 | 134Cd | |
49 | 135In | |
50 | 136Sn | 139Sn |
51 | 137Sb | 139Sb |
52 | 138Te | 139Te |
53 | 139I | 139I |
54 | 140Xe | 139Xe |
55 | 141Cs | 139Cs |
56 | 142Ba | 139Ba |
57 | 143La | 139La |
58 | 144Ce | 139Ce |
59 | 145Pr | 139Pr |
60 | 146Nd | 139Nd |
61 | 147Pm | 139Pm |
62 | 148Sm | 139Sm |
63 | 149Eu | 139Eu |
64 | 150Gd | 139Gd |
65 | 151Tb | 139Tb |
66 | 152Dy | 139Dy |
67 | 153Ho | |
68 | 154Er | |
69 | 155Tm | |
70 | 156Yb | |
71 | 157Lu | |
72 | 158Hf | |
73 | 159Ta | |
74 | 160W | |
75 | 161Re | |
76 | 162Os | |
External data and identifiers
Literature and References
[1] - R. C. Greenwood, K. D. Watts:
Delayed Neutron Energy Spectra of 87Br, 88Br, 89Br, 90Br, 137I, 138I, 139I, and 136Te.
In: Nuclear Science and Engineering, Volume 126, (2017), DOI 10.13182/NSE97-A24484.
Last update: 2023-04-27
Perma link: https://www.chemlin.org/isotope/iodine-139
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