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Radionuclide Dosimetric Data Sheets
Niobium-91m
Summary data
General
Classification
Isotope: Nb-91m
Atomic number (Z): 41
Mass number (A): 91
Neutron number (N): 50
Radioactive decay
Decay modes: β+, Electron capture, Internal
transition
Half-life: 60.86 [d]
Decay constant: 1.3182e-07 [1/s]
Daughters: Nb-91 (96.6%), Zr-91 (3.4%)
Radioactive daughters: Nb-91
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.0963 [MeV]
Mean photon energy: 0.03399 [MeV]
Air kerma rate constant, Γ10: 1.144e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.144e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.543e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 0.000e+00
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
1.543e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.446e-15
[Gy·kg/Bq·s]
Dose point kernels (plot)
Dose point kernel source: Graves, et al. Medical Physics. 2019 Nov.; 46(11):5284-5293.
Note: Bins are spaced every 0.1 mm until a radius of 10 cm, and every 1 mm until a radius of 2 m.
Download tabulated dose point kernel file here: www.mirdsoft.org/products/MIRDspecs/Nb-91m DPK.csv
Summary spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Nb-91m Summary Spectrum.csv
Beta spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated beta spectra file here: www.mirdsoft.org/products/MIRDspecs/Nb-91m Beta Spectrum.csv
Tabulated data
Summary spectra (table)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Note: Radiations with yield < 0.01 are excluded from the table, but are available in the linked *.csv data.
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Nb-91m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
5.83022e-06 |
1.049e+01 |
X-ray |
|
6.52411e-06 |
4.096e-01 |
X-ray |
|
2.15729e-03 |
1.907e-02 |
X-ray |
|
1.57372e-02 |
1.177e-02 |
X-ray |
|
1.64814e-02 |
1.474e-01 |
X-ray |
|
1.65789e-02 |
2.815e-01 |
X-ray |
|
1.85728e-02 |
2.257e-02 |
X-ray |
|
1.85887e-02 |
4.395e-02 |
X-ray |
|
1.20467e+00 |
2.020e-02 |
Gamma |
|
2.22340e-05 |
2.172e-01 |
Auger electron |
|
2.53216e-05 |
5.169e+00 |
Auger electron |
|
9.82224e-05 |
3.247e-02 |
Auger electron |
|
1.03286e-04 |
8.866e-01 |
Auger electron |
|
1.08895e-04 |
1.986e-01 |
Auger electron |
|
1.17920e-04 |
7.436e-02 |
Auger electron |
|
1.48991e-04 |
2.094e+00 |
Auger electron |
|
1.89295e-04 |
2.307e-02 |
Auger electron |
|
1.75408e-03 |
3.067e-02 |
Auger electron |
|
1.85152e-03 |
8.372e-01 |
Auger electron |
|
2.07243e-03 |
1.072e-01 |
Auger electron |
|
1.40095e-02 |
1.240e-01 |
Auger electron |
|
1.61428e-02 |
4.497e-02 |
Auger electron |
|
8.56720e-02 |
6.802e-01 |
Conversion electron |
|
1.01944e-01 |
1.277e-01 |
Conversion electron |
|
1.02153e-01 |
2.711e-02 |
Conversion electron |
|
1.02251e-01 |
1.073e-01 |
Conversion electron |
|
1.04261e-01 |
5.107e-02 |
Conversion electron |
Useful Links
Isotope decay characteristics are periodically updated as better measurements can be made - changes that may not be reflected on this page. Please see useful links:
National Nuclear Data Center (NNDC): https://www.nndc.bnl.gov/nudat3/mird/
International Atomic Energy Agency (IAEA) Livechart: https://www-nds.iaea.org/relnsd/vcharthtml/VChartHTML.html
Reference Links
ICRP Report 107: https://www.icrp.org/publication.asp?id=ICRP%20Publication%20107
Graves et al. Dose Point Kernels: https://doi.org/10.1002/mp.13789
MIRD Decay Schemes 2nd Edition: https://sites.snmmi.org/SNMMI-MAIN/iCore/Store/StoreLayouts/Item_Detail.aspx?iProductCode=0-932004-80-6
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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