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Radionuclide Dosimetric Data Sheets
Hafnium-177m
Summary data
General
Classification
Isotope: Hf-177m
Atomic number (Z): 72
Mass number (A): 177
Neutron number (N): 105
Radioactive decay
Decay modes: Internal transition
Half-life: 51.4 [m]
Decay constant: 2.2476e-04 [1/s]
Daughters: Hf-177 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.50777 [MeV]
Mean photon energy: 2.28635 [MeV]
Air kerma rate constant, Γ10: 8.620e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.620e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.135e-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-:
8.135e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.663e-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-177m 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-177m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.93964e-05 |
3.420e+01 |
X-ray |
|
1.63835e-03 |
1.029e-01 |
X-ray |
|
6.98230e-03 |
2.333e-02 |
X-ray |
|
7.83282e-03 |
3.860e-02 |
X-ray |
|
7.88959e-03 |
3.406e-01 |
X-ray |
|
8.88688e-03 |
1.544e-02 |
X-ray |
|
9.03750e-03 |
2.572e-01 |
X-ray |
|
9.14599e-03 |
1.990e-02 |
X-ray |
|
9.34358e-03 |
5.919e-02 |
X-ray |
|
1.05374e-02 |
4.680e-02 |
X-ray |
|
5.47191e-02 |
5.995e-01 |
X-ray |
|
5.51500e-02 |
2.276e-02 |
Gamma |
|
5.59237e-02 |
1.049e+00 |
X-ray |
|
6.31238e-02 |
1.117e-01 |
X-ray |
|
6.33831e-02 |
2.158e-01 |
X-ray |
|
6.50467e-02 |
2.511e-02 |
X-ray |
|
6.51063e-02 |
4.861e-02 |
X-ray |
|
6.54439e-02 |
1.176e-02 |
X-ray |
|
7.16460e-02 |
1.154e-02 |
Gamma |
|
1.05360e-01 |
1.576e-01 |
Gamma |
|
1.12950e-01 |
2.607e-01 |
Gamma |
|
1.28503e-01 |
1.984e-01 |
Gamma |
|
1.36725e-01 |
1.784e-02 |
Gamma |
|
1.45769e-01 |
1.161e-02 |
Gamma |
|
1.53284e-01 |
2.161e-01 |
Gamma |
|
1.74399e-01 |
1.611e-01 |
Gamma |
|
1.77001e-01 |
4.383e-02 |
Gamma |
|
2.04105e-01 |
1.769e-01 |
Gamma |
|
2.08366e-01 |
7.367e-01 |
Gamma |
|
2.14000e-01 |
4.229e-01 |
Gamma |
|
2.14434e-01 |
8.421e-02 |
Gamma |
|
2.28484e-01 |
4.722e-01 |
Gamma |
|
2.33861e-01 |
7.121e-02 |
Gamma |
|
2.49674e-01 |
7.844e-02 |
Gamma |
|
2.54800e-01 |
1.415e-02 |
Gamma |
|
2.77300e-01 |
7.844e-01 |
Gamma |
|
2.81787e-01 |
1.807e-01 |
Gamma |
|
2.91420e-01 |
1.300e-02 |
Gamma |
|
2.92510e-01 |
1.054e-02 |
Gamma |
|
2.95100e-01 |
7.229e-01 |
Gamma |
|
2.96458e-01 |
6.483e-02 |
Gamma |
|
2.99051e-01 |
2.299e-02 |
Gamma |
|
3.05503e-01 |
2.322e-02 |
Gamma |
|
3.11500e-01 |
6.075e-01 |
Gamma |
|
3.13725e-01 |
1.607e-02 |
Gamma |
|
3.21316e-01 |
1.538e-02 |
Gamma |
|
3.26700e-01 |
6.767e-01 |
Gamma |
|
3.27683e-01 |
2.307e-01 |
Gamma |
|
3.41643e-01 |
2.153e-02 |
Gamma |
|
3.78503e-01 |
3.799e-01 |
Gamma |
|
3.85030e-01 |
3.999e-02 |
Gamma |
|
4.18539e-01 |
2.715e-01 |
Gamma |
|
4.65842e-01 |
2.999e-02 |
Gamma |
|
5.72400e-01 |
7.382e-02 |
Gamma |
|
6.06500e-01 |
1.192e-01 |
Gamma |
|
6.38200e-01 |
2.099e-01 |
Gamma |
|
1.08180e-05 |
2.987e+00 |
Auger electron |
|
2.44614e-05 |
4.228e+00 |
Auger electron |
|
1.59820e-04 |
1.190e+01 |
Auger electron |
|
2.84090e-04 |
3.781e-01 |
Auger electron |
|
3.04001e-04 |
2.030e+00 |
Auger electron |
|
5.85142e-04 |
6.325e-01 |
Auger electron |
|
1.36452e-03 |
5.160e+00 |
Auger electron |
|
1.54339e-03 |
2.717e-01 |
Auger electron |
|
1.76569e-03 |
1.689e-02 |
Auger electron |
|
2.91500e-03 |
2.848e-01 |
Conversion electron |
|
3.39700e-03 |
2.743e-02 |
Conversion electron |
|
6.19458e-03 |
1.644e+00 |
Auger electron |
|
7.81726e-03 |
6.105e-01 |
Auger electron |
|
9.47130e-03 |
5.717e-02 |
Auger electron |
|
1.20610e-02 |
7.139e-02 |
Conversion electron |
|
1.41600e-02 |
2.068e-02 |
Conversion electron |
|
3.98775e-02 |
4.323e-01 |
Conversion electron |
|
4.45280e-02 |
6.648e-02 |
Auger electron |
|
4.74678e-02 |
2.106e-01 |
Conversion electron |
|
5.31026e-02 |
3.442e-02 |
Auger electron |
|
6.30210e-02 |
3.084e-01 |
Conversion electron |
|
8.78023e-02 |
2.071e-01 |
Conversion electron |
|
9.41145e-02 |
6.067e-02 |
Conversion electron |
|
9.45965e-02 |
1.935e-02 |
Conversion electron |
|
9.58012e-02 |
1.344e-02 |
Conversion electron |
|
1.01705e-01 |
2.252e-02 |
Conversion electron |
|
1.02187e-01 |
1.415e-01 |
Conversion electron |
|
1.03261e-01 |
2.180e-02 |
Conversion electron |
|
1.03392e-01 |
1.250e-01 |
Conversion electron |
|
1.08917e-01 |
1.082e-01 |
Conversion electron |
|
1.10851e-01 |
7.215e-02 |
Conversion electron |
|
1.12950e-01 |
1.962e-02 |
Conversion electron |
|
1.17258e-01 |
4.327e-02 |
Conversion electron |
|
1.17740e-01 |
1.117e-02 |
Conversion electron |
|
1.26404e-01 |
1.421e-02 |
Conversion electron |
|
1.38623e-01 |
7.643e-02 |
Conversion electron |
|
1.42039e-01 |
2.918e-02 |
Conversion electron |
|
1.42884e-01 |
3.998e-02 |
Conversion electron |
|
1.48518e-01 |
1.797e-01 |
Conversion electron |
|
1.48952e-01 |
3.216e-02 |
Conversion electron |
|
1.63002e-01 |
5.442e-02 |
Conversion electron |
|
1.63154e-01 |
1.517e-02 |
Conversion electron |
|
1.92860e-01 |
1.070e-02 |
Conversion electron |
|
2.02755e-01 |
2.641e-02 |
Conversion electron |
|
2.03237e-01 |
2.109e-01 |
Conversion electron |
|
2.04442e-01 |
1.186e-01 |
Conversion electron |
|
2.11818e-01 |
1.486e-01 |
Conversion electron |
|
2.11901e-01 |
9.177e-02 |
Conversion electron |
|
2.14000e-01 |
2.515e-02 |
Conversion electron |
|
2.16305e-01 |
1.177e-02 |
Conversion electron |
|
2.17721e-01 |
1.154e-02 |
Conversion electron |
|
2.29618e-01 |
1.110e-01 |
Conversion electron |
|
2.46018e-01 |
8.879e-02 |
Conversion electron |
|
2.61218e-01 |
8.708e-02 |
Conversion electron |
|
2.62201e-01 |
1.005e-02 |
Conversion electron |
|
2.66055e-01 |
2.076e-02 |
Conversion electron |
|
2.83855e-01 |
1.543e-02 |
Conversion electron |
|
3.00255e-01 |
1.241e-02 |
Conversion electron |
|
3.13021e-01 |
1.138e-02 |
Conversion electron |
|
3.15455e-01 |
1.216e-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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