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Radionuclide Dosimetric Data Sheets
Hafnium-180m
Summary data
General
Classification
Isotope: Hf-180m
Atomic number (Z): 72
Mass number (A): 180
Neutron number (N): 108
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 5.5 [h]
Decay constant: 3.5007e-05 [1/s]
Daughters: Hf-180 (99.7%), Ta-180m (0.3%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.14374 [MeV]
Mean photon energy: 0.98839 [MeV]
Air kerma rate constant, Γ10: 3.768e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.768e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.303e-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-:
2.303e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.584e-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/Hf-180m 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/Hf-180m 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-180m 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-180m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.94075e-05 |
1.179e+01 |
X-ray |
|
1.63889e-03 |
3.552e-02 |
X-ray |
|
7.83281e-03 |
1.296e-02 |
X-ray |
|
7.88959e-03 |
1.144e-01 |
X-ray |
|
9.03751e-03 |
9.805e-02 |
X-ray |
|
9.34358e-03 |
1.988e-02 |
X-ray |
|
1.05374e-02 |
1.784e-02 |
X-ray |
|
5.47191e-02 |
9.898e-02 |
X-ray |
|
5.59237e-02 |
1.732e-01 |
X-ray |
|
5.75470e-02 |
4.800e-01 |
Gamma |
|
6.31238e-02 |
1.844e-02 |
X-ray |
|
6.33831e-02 |
3.563e-02 |
X-ray |
|
9.33250e-02 |
1.713e-01 |
Gamma |
|
2.15426e-01 |
8.132e-01 |
Gamma |
|
3.32275e-01 |
9.412e-01 |
Gamma |
|
4.43163e-01 |
8.188e-01 |
Gamma |
|
5.00697e-01 |
1.431e-01 |
Gamma |
|
1.07809e-05 |
1.029e+00 |
Auger electron |
|
2.44612e-05 |
1.456e+00 |
Auger electron |
|
1.59901e-04 |
4.106e+00 |
Auger electron |
|
2.83497e-04 |
1.304e-01 |
Auger electron |
|
3.04443e-04 |
7.033e-01 |
Auger electron |
|
6.17881e-04 |
1.878e-01 |
Auger electron |
|
1.36558e-03 |
1.780e+00 |
Auger electron |
|
1.54511e-03 |
9.386e-02 |
Auger electron |
|
6.20983e-03 |
5.678e-01 |
Auger electron |
|
7.83238e-03 |
2.110e-01 |
Auger electron |
|
9.48612e-03 |
1.976e-02 |
Auger electron |
|
2.78430e-02 |
1.875e-01 |
Conversion electron |
|
4.45280e-02 |
1.098e-02 |
Auger electron |
|
4.63020e-02 |
1.219e-01 |
Conversion electron |
|
4.67840e-02 |
5.408e-02 |
Conversion electron |
|
4.79887e-02 |
6.653e-02 |
Conversion electron |
|
5.54480e-02 |
5.524e-02 |
Conversion electron |
|
5.75470e-02 |
1.517e-02 |
Conversion electron |
|
8.20800e-02 |
1.909e-02 |
Conversion electron |
|
8.25620e-02 |
2.340e-01 |
Conversion electron |
|
8.37667e-02 |
2.201e-01 |
Conversion electron |
|
9.12260e-02 |
1.185e-01 |
Conversion electron |
|
9.33250e-02 |
3.210e-02 |
Conversion electron |
|
1.49944e-01 |
1.103e-01 |
Conversion electron |
|
2.04181e-01 |
1.261e-02 |
Conversion electron |
|
2.04663e-01 |
2.566e-02 |
Conversion electron |
|
2.05868e-01 |
1.780e-02 |
Conversion electron |
|
2.13327e-01 |
1.375e-02 |
Conversion electron |
|
2.66793e-01 |
3.955e-02 |
Conversion electron |
|
3.77681e-01 |
1.651e-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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