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Radionuclide Dosimetric Data Sheets
Hafnium-169
Summary data
General
Classification
Isotope: Hf-169
Atomic number (Z): 72
Mass number (A): 169
Neutron number (N): 97
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 3.24 [m]
Decay constant: 3.5656e-03 [1/s]
Daughters: Lu-169 (96.9%), Lu-169m (3.1%)
Radioactive daughters: Lu-169, Lu-169m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.13089 [MeV]
Mean photon energy: 0.64161 [MeV]
Air kerma rate constant, Γ10: 1.989e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.517e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.097e-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-:
2.097e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.028e-13
[Gy·kg/Bq·s]
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/Hf-169 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/Hf-169 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/Hf-169 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.40161e-05 |
9.096e+00 |
X-ray |
|
1.56946e-03 |
2.506e-02 |
X-ray |
|
7.59237e-03 |
1.049e-02 |
X-ray |
|
7.64540e-03 |
9.262e-02 |
X-ray |
|
8.72221e-03 |
5.721e-02 |
X-ray |
|
9.04392e-03 |
1.594e-02 |
X-ray |
|
1.01636e-02 |
1.030e-02 |
X-ray |
|
5.30692e-02 |
2.296e-01 |
X-ray |
|
5.41988e-02 |
4.032e-01 |
X-ray |
|
6.11839e-02 |
4.273e-02 |
X-ray |
|
6.14258e-02 |
8.256e-02 |
X-ray |
|
6.30870e-02 |
1.847e-02 |
X-ray |
|
6.84000e-02 |
1.596e-02 |
Gamma |
|
1.23600e-01 |
3.864e-02 |
Gamma |
|
3.69500e-01 |
9.744e-02 |
Gamma |
|
4.92860e-01 |
8.400e-01 |
Gamma |
|
5.11000e-01 |
2.727e-01 |
Annihilation photon |
|
8.31050e-01 |
1.364e-01 |
Positron |
|
9.96729e-06 |
7.909e-01 |
Auger electron |
|
2.16358e-05 |
1.121e+00 |
Auger electron |
|
1.56517e-04 |
3.247e+00 |
Auger electron |
|
2.64872e-04 |
9.827e-02 |
Auger electron |
|
2.66416e-04 |
5.797e-01 |
Auger electron |
|
5.64913e-04 |
1.454e-01 |
Auger electron |
|
1.30969e-03 |
1.366e+00 |
Auger electron |
|
1.48434e-03 |
6.569e-02 |
Auger electron |
|
4.95800e-03 |
1.212e-02 |
Conversion electron |
|
5.97125e-03 |
4.459e-01 |
Auger electron |
|
7.52564e-03 |
1.629e-01 |
Auger electron |
|
9.11022e-03 |
1.508e-02 |
Auger electron |
|
9.45801e-03 |
4.675e-02 |
Conversion electron |
|
4.32341e-02 |
2.655e-02 |
Auger electron |
|
5.15128e-02 |
1.366e-02 |
Auger electron |
|
6.01580e-02 |
5.801e-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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