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Niobium-99m

Properties and data of the isotope 99Nb.


Content

See also: list of Niobium isotopes.

 

General data

Name of the isotope:Niobium-99m; Nb-99mSymbol:99Nb or 9941NbMass number A:99 (= number of nucleons)Atomic number Z:41 (= number of protons)Neutrons N:58Isotopic mass:98.911609(13) u (atomic weight of Niobium-99m)
Excitation energy: 365.27(8) keV
Nuclide mass:98.8891182 u (calculated nuclear mass without electrons)Mass excess:-82.33569 MeVMass defect:0.91178244000001 u (per nucleus)Nuclear binding energy:849.31987217 MeV (per nucleus)
8.57898861 MeV (average binding energy per nucleon)
Half-life:2.5(2) minDecay constant λ:0.004620981203733 s-1Specific activity α:2.839612216326 × 10+19 Bq g-1
767462761.16932 Ci g-1
Spin and parity:
(nuclear angular momentum)
1/2-

 

Radioactive Decay

Half-life T½ = 2.5(2) min (minutes) respectively 1.50 × 102 seconds s.

Decay modeDaughterProbabilityDecay energyγ energy
(intensity)
β-99Mo> 96.2 %
Iso99Nb< 3.8 %

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
99Nb15.0(2) s9/2+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 58) and isobaric (same nucleon number A = 99) with Niobium-99m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 58Isobar A = 99
3290Ge
3391As
3492Se
3593Br
3694Kr99Kr
3795Rb99Rb
3896Sr99Sr
3997Y99Y
4098Zr99Zr
4199Nb99Nb
42100Mo99Mo
43101Tc99Tc
44102Ru99Ru
45103Rh99Rh
46104Pd99Pd
47105Ag99Ag
48106Cd99Cd
49107In99In
50108Sn99Sn
51109Sb
52110Te
53111I
54112Xe
55113Cs
56114Ba

 


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Last update: 2020-10-15


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