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Radionuclide Dosimetric Data Sheets
Niobium-94m
Summary data
General
Classification
Isotope: Nb-94m
Atomic number (Z): 41
Mass number (A): 94
Neutron number (N): 53
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 6.263 [m]
Decay constant: 1.8446e-03 [1/s]
Daughters: Nb-94 (99.5%), Mo-94 (0.5%)
Radioactive daughters: Nb-94
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.03564 [MeV]
Mean photon energy: 0.01168 [MeV]
Air kerma rate constant, Γ10: 8.602e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.602e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 5.710e-15 [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-:
5.710e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.871e-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-94m 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-94m 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-94m 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-94m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
5.83007e-06 |
1.022e+01 |
X-ray |
|
2.15729e-03 |
1.903e-02 |
X-ray |
|
1.64814e-02 |
1.230e-01 |
X-ray |
|
1.65789e-02 |
2.349e-01 |
X-ray |
|
1.85728e-02 |
1.883e-02 |
X-ray |
|
1.85887e-02 |
3.667e-02 |
X-ray |
|
2.53152e-05 |
5.037e+00 |
Auger electron |
|
1.02915e-04 |
8.637e-01 |
Auger electron |
|
1.10642e-04 |
2.053e-01 |
Auger electron |
|
1.49042e-04 |
2.039e+00 |
Auger electron |
|
1.89497e-04 |
2.248e-02 |
Auger electron |
|
1.84992e-03 |
8.079e-01 |
Auger electron |
|
2.07104e-03 |
1.034e-01 |
Auger electron |
|
1.40095e-02 |
1.034e-01 |
Auger electron |
|
1.61428e-02 |
3.752e-02 |
Auger electron |
|
2.19920e-02 |
5.675e-01 |
Conversion electron |
|
3.82637e-02 |
1.539e-01 |
Conversion electron |
|
3.84734e-02 |
2.342e-02 |
Conversion electron |
|
3.85709e-02 |
1.701e-01 |
Conversion electron |
|
4.05807e-02 |
6.845e-02 |
Conversion electron |
|
4.09400e-02 |
1.100e-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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