See also: List of individual Iodine isotopes (and general data sources).
General data
Name of the isotope:Iodine-118m; I-118mOther names:Jod-118mSymbol:118mI or 118m53IMass number A:118 (= number of nucleons)Atomic number Z:53 (= number of protons)Neutrons N:65Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.2264150943396 (= neutron-proton ratio)Neutron excess (N-Z):12Excitation energy:190.1(10) keVIsotopic mass:117.913074(21) u (atomic weight of Iodine-118m)Nuclide mass:117.8840011 u (calculated nuclear mass without electrons)Mass excess:-80.97105 MeVMass defect:1.064872236 u (per nucleus)Nuclear binding energy:991.9220986 MeV (per nucleus) 8.40611948 MeV (average binding energy per nucleon)Half-life:8.5(5) minDecay constant λ:0.001359112118745 s-1Specific activity α:6.941354516551 × 10+18 Bq g-1 187604176.12302 Ci g-1Spin and parity: (nuclear angular momentum)(7-)Magnetic dipole moment:μ(μN) = 4.2(2)Nuclear g-factor:gl = 0.6
Radioactive Decay
Half-life T½ = 8.5(5) min (minutes) respectively 5.10 × 102 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
EC/β+
118Te
< 100 %
Iso
118I
> 100 %
Nuclear Isomers
Nuclear isomers or excited states with the activation energy in keV related to the ground state.
The following table shows the atomic nuclei that are isotonic (same neutron number N = 65) and isobaric (same nucleon number A = 118) with Iodine-118m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
