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Radionuclide Dosimetric Data Sheets
Niobium-89m
Summary data
General
Classification
Isotope: Nb-89m
Atomic number (Z): 41
Mass number (A): 89
Neutron number (N): 48
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 66.0 [m]
Decay constant: 1.7504e-04 [1/s]
Daughters: Zr-89m (100.0%)
Radioactive daughters: Zr-89m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.78551 [MeV]
Mean photon energy: 1.3058 [MeV]
Air kerma rate constant, Γ10: 2.108e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.211e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.259e-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-:
1.259e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.092e-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-89m 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-89m 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-89m 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-89m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
6.52412e-06 |
2.423e+00 |
X-ray |
|
1.56498e-02 |
3.713e-02 |
X-ray |
|
1.57372e-02 |
7.106e-02 |
X-ray |
|
1.76312e-02 |
1.091e-02 |
X-ray |
|
5.07400e-01 |
8.123e-01 |
Gamma |
|
5.11000e-01 |
1.603e+00 |
Annihilation photon |
|
7.69600e-01 |
6.212e-02 |
Gamma |
|
1.27750e+00 |
1.529e-02 |
Gamma |
|
5.99787e-01 |
4.008e-02 |
Positron |
|
9.50172e-01 |
6.112e-01 |
Positron |
|
1.18605e+00 |
1.503e-01 |
Positron |
|
2.22356e-05 |
1.285e+00 |
Auger electron |
|
9.83479e-05 |
1.922e-01 |
Auger electron |
|
1.06532e-04 |
4.075e-02 |
Auger electron |
|
1.17893e-04 |
4.400e-01 |
Auger electron |
|
1.58198e-04 |
1.299e-02 |
Auger electron |
|
1.75388e-03 |
1.823e-01 |
Auger electron |
|
1.94477e-03 |
2.044e-02 |
Auger electron |
|
1.33271e-02 |
3.448e-02 |
Auger electron |
|
1.53342e-02 |
1.228e-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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