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Radionuclide Dosimetric Data Sheets
Tantalum-178m
Summary data
General
Classification
Isotope: Ta-178m
Atomic number (Z): 73
Mass number (A): 178
Neutron number (N): 105
Radioactive decay
Decay modes: Electron capture
Half-life: 2.36 [h]
Decay constant: 8.1585e-05 [1/s]
Daughters: Hf-178 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.16155 [MeV]
Mean photon energy: 1.1558 [MeV]
Air kerma rate constant, Γ10: 4.425e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.425e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.588e-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-:
2.588e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.852e-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/Ta-178m 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/Ta-178m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.94164e-05 |
2.097e+01 |
X-ray |
|
1.63817e-03 |
6.357e-02 |
X-ray |
|
6.98230e-03 |
1.501e-02 |
X-ray |
|
7.83282e-03 |
2.484e-02 |
X-ray |
|
7.88959e-03 |
2.192e-01 |
X-ray |
|
9.03750e-03 |
1.648e-01 |
X-ray |
|
9.34358e-03 |
3.809e-02 |
X-ray |
|
1.05374e-02 |
2.998e-02 |
X-ray |
|
5.47191e-02 |
4.039e-01 |
X-ray |
|
5.59237e-02 |
7.066e-01 |
X-ray |
|
6.31238e-02 |
7.523e-02 |
X-ray |
|
6.33831e-02 |
1.454e-01 |
X-ray |
|
6.50467e-02 |
1.692e-02 |
X-ray |
|
6.51063e-02 |
3.275e-02 |
X-ray |
|
8.88620e-02 |
6.436e-01 |
Gamma |
|
9.31850e-02 |
1.722e-01 |
Gamma |
|
2.13434e-01 |
8.140e-01 |
Gamma |
|
3.25557e-01 |
9.410e-01 |
Gamma |
|
3.31613e-01 |
3.119e-01 |
Gamma |
|
4.26360e-01 |
9.702e-01 |
Gamma |
|
1.07899e-05 |
1.823e+00 |
Auger electron |
|
2.44610e-05 |
2.587e+00 |
Auger electron |
|
1.59839e-04 |
7.306e+00 |
Auger electron |
|
2.82555e-04 |
2.300e-01 |
Auger electron |
|
3.02497e-04 |
1.232e+00 |
Auger electron |
|
6.31366e-04 |
2.893e-01 |
Auger electron |
|
1.36459e-03 |
3.187e+00 |
Auger electron |
|
1.54285e-03 |
1.679e-01 |
Auger electron |
|
1.76526e-03 |
1.046e-02 |
Auger electron |
|
6.17347e-03 |
1.033e+00 |
Auger electron |
|
7.79328e-03 |
3.834e-01 |
Auger electron |
|
9.44319e-03 |
3.587e-02 |
Auger electron |
|
2.33800e-02 |
2.567e-01 |
Conversion electron |
|
2.77030e-02 |
1.888e-01 |
Conversion electron |
|
4.45280e-02 |
4.479e-02 |
Auger electron |
|
5.31026e-02 |
2.319e-02 |
Auger electron |
|
7.76170e-02 |
2.683e-02 |
Conversion electron |
|
8.19400e-02 |
1.925e-02 |
Conversion electron |
|
8.24220e-02 |
2.369e-01 |
Conversion electron |
|
8.36267e-02 |
2.229e-01 |
Conversion electron |
|
8.67630e-02 |
1.025e-02 |
Conversion electron |
|
9.10860e-02 |
1.199e-01 |
Conversion electron |
|
9.31850e-02 |
3.250e-02 |
Conversion electron |
|
1.47952e-01 |
1.133e-01 |
Conversion electron |
|
2.02189e-01 |
1.293e-02 |
Conversion electron |
|
2.02671e-01 |
2.674e-02 |
Conversion electron |
|
2.03876e-01 |
1.862e-02 |
Conversion electron |
|
2.11335e-01 |
1.430e-02 |
Conversion electron |
|
2.60075e-01 |
4.172e-02 |
Conversion electron |
|
2.66131e-01 |
3.857e-02 |
Conversion electron |
|
3.60878e-01 |
2.152e-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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