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Radionuclide Dosimetric Data Sheets
Tantalum-173
Summary data
General
Classification
Isotope: Ta-173
Atomic number (Z): 73
Mass number (A): 173
Neutron number (N): 100
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 3.14 [h]
Decay constant: 6.1319e-05 [1/s]
Daughters: Hf-173 (100.0%)
Radioactive daughters: Hf-173
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.16864 [MeV]
Mean photon energy: 0.5824 [MeV]
Air kerma rate constant, Γ10: 1.825e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.231e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.702e-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-:
2.702e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 9.331e-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-173 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-173 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/Ta-173 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/Ta-173 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.93957e-05 |
1.966e+01 |
X-ray |
|
1.63807e-03 |
5.923e-02 |
X-ray |
|
6.98230e-03 |
1.375e-02 |
X-ray |
|
7.83281e-03 |
2.276e-02 |
X-ray |
|
7.88959e-03 |
2.008e-01 |
X-ray |
|
9.03750e-03 |
1.401e-01 |
X-ray |
|
9.14599e-03 |
1.161e-02 |
X-ray |
|
9.34358e-03 |
3.490e-02 |
X-ray |
|
1.05374e-02 |
2.549e-02 |
X-ray |
|
3.74000e-02 |
1.243e-02 |
Gamma |
|
5.47191e-02 |
3.441e-01 |
X-ray |
|
5.59237e-02 |
6.020e-01 |
X-ray |
|
6.31238e-02 |
6.408e-02 |
X-ray |
|
6.33831e-02 |
1.239e-01 |
X-ray |
|
6.50467e-02 |
1.441e-02 |
X-ray |
|
6.51063e-02 |
2.790e-02 |
X-ray |
|
6.97000e-02 |
5.950e-02 |
Gamma |
|
8.15000e-02 |
1.470e-02 |
Gamma |
|
9.03000e-02 |
5.040e-02 |
Gamma |
|
1.60400e-01 |
4.900e-02 |
Gamma |
|
1.72200e-01 |
1.750e-01 |
Gamma |
|
1.80600e-01 |
2.223e-02 |
Gamma |
|
5.11000e-01 |
2.099e-01 |
Annihilation photon |
|
7.00600e-01 |
1.155e-02 |
Gamma |
|
1.03000e+00 |
1.418e-02 |
Gamma |
|
1.20820e+00 |
2.678e-02 |
Gamma |
|
7.87332e-01 |
3.409e-02 |
Positron |
|
8.47286e-01 |
1.542e-02 |
Positron |
|
8.63966e-01 |
4.668e-02 |
Positron |
|
1.08310e-05 |
1.717e+00 |
Auger electron |
|
2.44615e-05 |
2.431e+00 |
Auger electron |
|
1.59777e-04 |
6.843e+00 |
Auger electron |
|
2.84000e-04 |
2.169e-01 |
Auger electron |
|
3.03417e-04 |
1.163e+00 |
Auger electron |
|
5.79373e-04 |
3.626e-01 |
Auger electron |
|
1.36408e-03 |
2.971e+00 |
Auger electron |
|
1.54262e-03 |
1.563e-01 |
Auger electron |
|
4.21800e-03 |
3.635e-01 |
Conversion electron |
|
6.17893e-03 |
9.467e-01 |
Auger electron |
|
7.80075e-03 |
3.514e-01 |
Auger electron |
|
9.45366e-03 |
3.290e-02 |
Auger electron |
|
1.44550e-02 |
3.710e-02 |
Conversion electron |
|
1.60180e-02 |
1.891e-02 |
Conversion electron |
|
2.46180e-02 |
1.735e-02 |
Conversion electron |
|
2.48180e-02 |
1.929e-02 |
Conversion electron |
|
2.61550e-02 |
1.084e-01 |
Conversion electron |
|
2.66370e-02 |
1.121e-02 |
Conversion electron |
|
3.53010e-02 |
2.774e-02 |
Conversion electron |
|
4.45281e-02 |
3.815e-02 |
Auger electron |
|
4.68050e-02 |
1.129e-02 |
Conversion electron |
|
5.31026e-02 |
1.975e-02 |
Auger electron |
|
5.84550e-02 |
5.212e-02 |
Conversion electron |
|
5.89370e-02 |
1.432e-01 |
Conversion electron |
|
6.01417e-02 |
1.424e-01 |
Conversion electron |
|
6.76010e-02 |
8.331e-02 |
Conversion electron |
|
6.97000e-02 |
2.276e-02 |
Conversion electron |
|
7.07370e-02 |
3.774e-02 |
Conversion electron |
|
7.19417e-02 |
3.691e-02 |
Conversion electron |
|
7.94010e-02 |
1.923e-02 |
Conversion electron |
|
9.49180e-02 |
3.480e-02 |
Conversion electron |
|
1.06718e-01 |
4.408e-02 |
Conversion electron |
|
1.61437e-01 |
1.475e-02 |
Conversion electron |
|
1.62642e-01 |
1.121e-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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