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Radionuclide Dosimetric Data Sheets
Niobium-89
Summary data
General
Classification
Isotope: Nb-89
Atomic number (Z): 41
Mass number (A): 89
Neutron number (N): 48
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 2.03 [h]
Decay constant: 9.4848e-05 [1/s]
Daughters: Zr-89 (98.8%), Zr-89m (1.23%)
Radioactive daughters: Zr-89, Zr-89m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.08593 [MeV]
Mean photon energy: 1.36679 [MeV]
Air kerma rate constant, Γ10: 2.111e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.037e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.740e-13 [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-:
1.740e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.190e-13
[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-89 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-89 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-89 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-89 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
6.52412e-06 |
2.947e+00 |
X-ray |
|
1.56498e-02 |
4.509e-02 |
X-ray |
|
1.57372e-02 |
8.628e-02 |
X-ray |
|
1.76312e-02 |
1.325e-02 |
X-ray |
|
5.11000e-01 |
1.511e+00 |
Annihilation photon |
|
9.20500e-01 |
1.435e-02 |
Gamma |
|
1.12700e+00 |
2.100e-02 |
Gamma |
|
1.25900e+00 |
1.225e-02 |
Gamma |
|
1.33230e+00 |
1.225e-02 |
Gamma |
|
1.51140e+00 |
1.925e-02 |
Gamma |
|
1.62720e+00 |
3.500e-02 |
Gamma |
|
1.83340e+00 |
3.255e-02 |
Gamma |
|
2.57230e+00 |
2.660e-02 |
Gamma |
|
2.96010e+00 |
1.750e-02 |
Gamma |
|
3.09270e+00 |
3.045e-02 |
Gamma |
|
1.44860e+00 |
7.449e-01 |
Positron |
|
2.22355e-05 |
1.563e+00 |
Auger electron |
|
9.83371e-05 |
2.338e-01 |
Auger electron |
|
1.06598e-04 |
4.976e-02 |
Auger electron |
|
1.17895e-04 |
5.352e-01 |
Auger electron |
|
1.58205e-04 |
1.580e-02 |
Auger electron |
|
1.75390e-03 |
2.217e-01 |
Auger electron |
|
1.94480e-03 |
2.486e-02 |
Auger electron |
|
1.33271e-02 |
4.187e-02 |
Auger electron |
|
1.53342e-02 |
1.491e-02 |
Auger 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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