See also: List of individual Antimony isotopes (and general data sources).
General data
Name of the isotope:Antimony-122; Sb-122Symbol:122Sb or 12251SbMass number A:122 (= number of nucleons)Atomic number Z:51 (= number of protons)Neutrons N:71Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3921568627451 (= neutron-proton ratio)Neutron excess (N-Z):20Isotopic mass:121.9051681(28) u (atomic weight of Antimony-122)Nuclide mass:121.8771922 u (calculated nuclear mass without electrons)Mass excess:-88.33535 MeVMass defect:1.109117568 u (per nucleus)Nuclear binding energy:1033.13635989 MeV (per nucleus) 8.46833082 MeV (average binding energy per nucleon)Separation energy:SN = 6.80637(13) MeV (first neutron) SP = 6.4271(27) MeV (first proton)Half-life:2.7238(2) dDecay constant λ:2.945347239898 × 10-6 s-1Specific activity α:1.45500768689 × 10+16 Bq g-1 393245.32078189 Ci g-1Spin and parity: (nuclear angular momentum)2-Magnetic dipole moment:μ(μN) = - 1.90(2)Quadrupole moment Q:+1.28(8) barn (100 fm2)Nuclear g-factor:gl = -0.95Year of discovery:1939
Radioactive Decay
Half-life T½ = 2.7238(2) d respectively 2.3533632 × 105 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
EC/β+
122Sn
2.41(12) %
1.606(4) MeV
β-
122Te
97.59(12) %
1.9791(21) MeV
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 = 71) and isobaric (same nucleon number A = 122) with Antimony-122. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
