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Radionuclide Dosimetric Data Sheets
Hafnium-172
Summary data
General
Classification
Isotope: Hf-172
Atomic number (Z): 72
Mass number (A): 172
Neutron number (N): 100
Radioactive decay
Decay modes: Electron capture
Half-life: 1.87 [y]
Decay constant: 1.1746e-08 [1/s]
Daughters: Lu-172m (100.0%)
Radioactive daughters: Lu-172m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.08284 [MeV]
Mean photon energy: 0.10616 [MeV]
Air kerma rate constant, Γ10: 8.013e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.013e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.327e-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-:
1.327e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.701e-14
[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-172 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-172 Summary 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-172 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.40000e-05 |
2.664e+01 |
X-ray |
|
1.57013e-03 |
7.259e-02 |
X-ray |
|
6.77270e-03 |
1.746e-02 |
X-ray |
|
7.59238e-03 |
2.839e-02 |
X-ray |
|
7.64541e-03 |
2.507e-01 |
X-ray |
|
8.58698e-03 |
1.480e-02 |
X-ray |
|
8.72221e-03 |
1.608e-01 |
X-ray |
|
8.82888e-03 |
1.936e-02 |
X-ray |
|
9.04389e-03 |
4.313e-02 |
X-ray |
|
1.01636e-02 |
2.893e-02 |
X-ray |
|
2.39331e-02 |
2.034e-01 |
Gamma |
|
5.30692e-02 |
3.423e-01 |
X-ray |
|
5.41988e-02 |
6.011e-01 |
X-ray |
|
6.06500e-02 |
1.130e-02 |
Gamma |
|
6.11839e-02 |
6.370e-02 |
X-ray |
|
6.14258e-02 |
1.231e-01 |
X-ray |
|
6.30318e-02 |
1.424e-02 |
X-ray |
|
6.30870e-02 |
2.754e-02 |
X-ray |
|
6.73500e-02 |
5.311e-02 |
Gamma |
|
8.17513e-02 |
4.520e-02 |
Gamma |
|
1.14061e-01 |
2.554e-02 |
Gamma |
|
1.22916e-01 |
1.141e-02 |
Gamma |
|
1.25812e-01 |
1.130e-01 |
Gamma |
|
1.27910e-01 |
1.458e-02 |
Gamma |
|
9.99700e-06 |
2.332e+00 |
Auger electron |
|
2.16363e-05 |
3.293e+00 |
Auger electron |
|
1.56475e-04 |
9.502e+00 |
Auger electron |
|
2.67017e-04 |
2.916e-01 |
Auger electron |
|
2.69095e-04 |
1.729e+00 |
Auger electron |
|
5.36462e-04 |
5.602e-01 |
Auger electron |
|
9.55001e-04 |
1.865e-02 |
Conversion electron |
|
1.31020e-03 |
3.956e+00 |
Auger electron |
|
1.48642e-03 |
1.904e-01 |
Auger electron |
|
1.56500e-03 |
2.019e-02 |
Conversion electron |
|
1.69167e-03 |
1.235e-02 |
Auger electron |
|
3.90800e-03 |
4.194e-02 |
Conversion electron |
|
6.00209e-03 |
1.253e+00 |
Auger electron |
|
6.54800e-03 |
7.331e-02 |
Conversion electron |
|
7.56019e-03 |
4.582e-01 |
Auger electron |
|
9.14995e-03 |
4.248e-02 |
Auger electron |
|
1.30881e-02 |
1.579e-01 |
Conversion electron |
|
1.35601e-02 |
1.476e-01 |
Conversion electron |
|
1.46899e-02 |
2.114e-01 |
Conversion electron |
|
1.83093e-02 |
2.568e-01 |
Conversion electron |
|
2.19170e-02 |
1.202e-01 |
Conversion electron |
|
2.39331e-02 |
3.132e-02 |
Conversion electron |
|
3.02850e-02 |
1.579e-02 |
Conversion electron |
|
3.37970e-02 |
1.365e-01 |
Conversion electron |
|
3.49268e-02 |
1.562e-01 |
Conversion electron |
|
4.21539e-02 |
7.300e-02 |
Conversion electron |
|
4.32341e-02 |
3.958e-02 |
Auger electron |
|
4.41700e-02 |
1.944e-02 |
Conversion electron |
|
4.98050e-02 |
2.162e-02 |
Conversion electron |
|
5.06190e-02 |
5.574e-02 |
Conversion electron |
|
5.15128e-02 |
2.036e-02 |
Auger electron |
|
5.91450e-02 |
1.031e-02 |
Conversion electron |
|
6.23700e-02 |
1.836e-01 |
Conversion electron |
|
7.09063e-02 |
3.617e-02 |
Conversion electron |
|
1.14967e-01 |
2.569e-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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