Iodine-123
Properties and data of the isotope 123I.
See also: list of Iodine isotopes.
General data
Name of the isotope:Iodine-123; I-123Other names:Jod-123Symbol:123I or 12353IMass number A:123 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:70Isotopic mass:122.905590(4) u (atomic weight of Iodine-123)Nuclide mass:122.8765171 u (calculated nuclear mass without electrons)Mass excess:-87.94235 MeVMass defect:1.115680816 u (per nucleus)Nuclear binding energy:1039.24998602 MeV (per nucleus)
8.44918688 MeV (average binding energy per nucleon)Separation energy:SN = 9.935(6) MeV (first neutron)
SP = 4.918(3) MeV (first proton)Half-life:13.2230(19) hDecay constant λ:1.456105902509 × 10-5 s-1Specific activity α:7.187602337622 × 10+16 Bq g-1
1942595.2263845 Ci g-1Spin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μN) = 2.818(7)Nuclear g-factor:gl = 1.1272Year of discovery:1949
Radioactive Decay
Half-life T½ = 13.2230(19) h (hours) respectively 4.76028 × 104 seconds s.
| Decay mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EE | 123Te | 100 % | 1.228(4) MeV | 0.15900(5) MeV
83.60(19) % |
Parent Nuclides
Direct parent isotope is: 123Xe.
Iodine-123 as a Radionuclide in Medicine
The gamma emitting isotope iodine-123 is used in nuclear medicine as a radioactive imaging tracer to assess the anatomical location and physiological function of the thyroid gland.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 70) and isobaric (same nucleon number A = 123) with Iodine-123. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| OZ | Isotone N = 70 | Isobar A = 123 |
|---|
| 39 | 109Y | |
| 40 | 110Zr | |
| 41 | 111Nb | |
| 42 | 112Mo | |
| 43 | 113Tc | |
| 44 | 114Ru | 123Ru |
| 45 | 115Rh | 123Rh |
| 46 | 116Pd | 123Pd |
| 47 | 117Ag | 123Ag |
| 48 | 118Cd | 123Cd |
| 49 | 119In | 123In |
| 50 | 120Sn | 123Sn |
| 51 | 121Sb | 123Sb |
| 52 | 122Te | 123Te |
| 53 | 123I | 123I |
| 54 | 124Xe | 123Xe |
| 55 | 125Cs | 123Cs |
| 56 | 126Ba | 123Ba |
| 57 | 127La | 123La |
| 58 | 128Ce | 123Ce |
| 59 | 129Pr | 123Pr |
| 60 | 130Nd | |
| 61 | 131Pm | |
| 62 | 132Sm | |
| 63 | 133Eu | |
| 64 | 134Gd | |
| 65 | 135Tb | |
External data and identifiers
Literature and References
[0] - Research articles in scientific journals via PubMed: Iodine-123.
Last update: 2023-05-22
Perma link: https://www.chemlin.org/isotope/iodine-123
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