See also: List of individual Bismuth isotopes (and general data sources).
General data
Name of the isotope:Bismuth-203m; Bi-203mSymbol:203mBi or 203m83BiMass number A:203 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:120Nucleon pairing (Z - N):odd - evenNuclear ratio (N/Z ratio):1.4457831325301 (= neutron-proton ratio)Neutron excess (N-Z):37Excitation energy:1098.12(12) keVIsotopic mass:202.976892(14) u (atomic weight of Bismuth-203m)Nuclide mass:202.9313651 u (calculated nuclear mass without electrons)Mass excess:-21.52496 MeVMass defect:1.712375576 u (per nucleus)Nuclear binding energy:1595.06757479 MeV (per nucleus) 7.85747574 MeV (average binding energy per nucleon)Half-life:305(5) msDecay constant λ:2.2726137067539 s-1Specific activity α:6.742639273034 × 10+21 Bq g-1 182233493865.81 Ci g-1Spin and parity: (nuclear angular momentum)1/2+
Radioactive Decay
Half-life T½ = 305(5) ms respectively 3.05 × 10-1 seconds s.
Decay mode
Daughter
Probability
Decay energy
γ energy (intensity)
Iso
203Bi
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 = 120) and isobaric (same nucleon number A = 203) with Bismuth-203m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.
