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Radionuclide Dosimetric Data Sheets
Tantalum-177
Summary data
General
Classification
Isotope: Ta-177
Atomic number (Z): 73
Mass number (A): 177
Neutron number (N): 104
Radioactive decay
Decay modes: Electron capture
Half-life: 56.56 [h]
Decay constant: 3.4042e-06 [1/s]
Daughters: Hf-177 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.02396 [MeV]
Mean photon energy: 0.06775 [MeV]
Air kerma rate constant, Γ10: 3.450e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.450e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.839e-15 [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-:
3.839e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.085e-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/Ta-177 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/Ta-177 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-177 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.94056e-05 |
1.017e+01 |
X-ray |
|
1.63766e-03 |
3.077e-02 |
X-ray |
|
7.83282e-03 |
1.232e-02 |
X-ray |
|
7.88959e-03 |
1.087e-01 |
X-ray |
|
9.03750e-03 |
7.121e-02 |
X-ray |
|
9.34358e-03 |
1.889e-02 |
X-ray |
|
1.05374e-02 |
1.296e-02 |
X-ray |
|
5.47191e-02 |
2.404e-01 |
X-ray |
|
5.59237e-02 |
4.207e-01 |
X-ray |
|
6.31238e-02 |
4.478e-02 |
X-ray |
|
6.33831e-02 |
8.656e-02 |
X-ray |
|
6.50467e-02 |
1.007e-02 |
X-ray |
|
6.51063e-02 |
1.950e-02 |
X-ray |
|
1.12900e-01 |
7.238e-02 |
Gamma |
|
1.08284e-05 |
8.850e-01 |
Auger electron |
|
2.44613e-05 |
1.256e+00 |
Auger electron |
|
1.59754e-04 |
3.539e+00 |
Auger electron |
|
2.83184e-04 |
1.115e-01 |
Auger electron |
|
3.02050e-04 |
5.947e-01 |
Auger electron |
|
5.92025e-04 |
1.653e-01 |
Auger electron |
|
1.36359e-03 |
1.544e+00 |
Auger electron |
|
1.54129e-03 |
8.119e-02 |
Auger electron |
|
6.15698e-03 |
4.982e-01 |
Auger electron |
|
7.77676e-03 |
1.848e-01 |
Auger electron |
|
9.42682e-03 |
1.729e-02 |
Auger electron |
|
4.45280e-02 |
2.666e-02 |
Auger electron |
|
4.74180e-02 |
5.854e-02 |
Conversion electron |
|
5.31026e-02 |
1.380e-02 |
Auger electron |
|
1.02137e-01 |
3.937e-02 |
Conversion electron |
|
1.03342e-01 |
3.477e-02 |
Conversion electron |
|
1.10801e-01 |
2.007e-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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