Iodine-124
Properties and data of the isotope 124I.
See also: List of individual Iodine isotopes (and general data sources).
General data
Name of the isotope:Iodine-124; I-124Other names:Jod-124Symbol:124I or 12453IMass number A:124 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:71Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3396226415094 (= neutron-proton ratio)Neutron excess (N-Z):18Isotopic mass:123.9062103(25) u (atomic weight of Iodine-124)Nuclide mass:123.8771374 u (calculated nuclear mass without electrons)Mass excess:-87.36454 MeVMass defect:1.123725432 u (per nucleus)Nuclear binding energy:1046.74349756 MeV (per nucleus)
8.44147982 MeV (average binding energy per nucleon)Separation energy:SN = 7.493(4) MeV (first neutron)
SP = 5.4825(19) MeV (first proton)Half-life:4.1760(3) dDecay constant λ:1.921105558437 × 10-6 s-1Specific activity α:9.405827869691 × 10+15 Bq g-1
254211.56404571 Ci g-1Spin and parity:
(nuclear angular momentum)2-Magnetic dipole moment:μ(μN) = 1.444(4)Nuclear g-factor:gl = 0.722Year of discovery:1938
Radioactive Decay
Half-life T½ = 4.1760(3) d respectively 3.608064 × 105 seconds s.
Decay
mode | Daughter | Probability | Decay energy | γ energy
(intensity) |
|---|
| EC/β+ | 124Te | 100 % | 3.1596(27) MeV | |
Iodine-124 as a Radionuclide in Medicine
Iodine-124, in the form of an iodide salt, can be used to image the thyroid gland using positron emission tomography (PET). When used as a tracer, the radionuclide is chemically bound to appropriate drug molecules; the positron-emitting radiopharmaceuticals thus formed are injected into the body; the radiation emitted by the 124I radionuclide can in turn be recorded using a PET scan.
Isotones and Isobars
The following table shows the atomic nuclei that are isotonic (same neutron number N = 71) and isobaric (same nucleon number A = 124) with Iodine-124. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
| Z | Isotone N = 71 | Isobar A = 124 |
|---|
| 40 | 111Zr | |
| 41 | 112Nb | |
| 42 | 113Mo | |
| 43 | 114Tc | |
| 44 | 115Ru | 124Ru |
| 45 | 116Rh | 124Rh |
| 46 | 117Pd | 124Pd |
| 47 | 118Ag | 124Ag |
| 48 | 119Cd | 124Cd |
| 49 | 120In | 124In |
| 50 | 121Sn | 124Sn |
| 51 | 122Sb | 124Sb |
| 52 | 123Te | 124Te |
| 53 | 124I | 124I |
| 54 | 125Xe | 124Xe |
| 55 | 126Cs | 124Cs |
| 56 | 127Ba | 124Ba |
| 57 | 128La | 124La |
| 58 | 129Ce | 124Ce |
| 59 | 130Pr | 124Pr |
| 60 | 131Nd | 124Nd |
| 61 | 132Pm | |
| 62 | 133Sm | |
| 63 | 134Eu | |
| 64 | 135Gd | |
| 65 | 136Tb | |
External data and identifiers
Literature and References
[1] - Krishan Kumar, Arijit Ghosh:
Radiochemistry, Production Processes, Labeling Methods, and ImmunoPET Imaging Pharmaceuticals of Iodine-124.
In: Molecules, 26(2), 414, (2021), DOI 10.3390/molecules26020414.
Last update: 2023-05-22
Perma link: https://www.chemlin.org/isotope/iodine-124
© 1996 - 2026 ChemLin
