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Radionuclide Dosimetric Data Sheets
Tantalum-172
Summary data
General
Classification
Isotope: Ta-172
Atomic number (Z): 73
Mass number (A): 172
Neutron number (N): 99
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 36.8 [m]
Decay constant: 3.1393e-04 [1/s]
Daughters: Hf-172 (100.0%)
Radioactive daughters: Hf-172
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.55129 [MeV]
Mean photon energy: 1.69665 [MeV]
Air kerma rate constant, Γ10: 4.767e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.090e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.833e-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-:
8.833e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.718e-13
[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-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/Ta-172 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-172 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-172 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.94206e-05 |
1.323e+01 |
X-ray |
|
1.63844e-03 |
4.011e-02 |
X-ray |
|
7.83282e-03 |
1.546e-02 |
X-ray |
|
7.88959e-03 |
1.364e-01 |
X-ray |
|
9.03750e-03 |
1.093e-01 |
X-ray |
|
9.34358e-03 |
2.370e-02 |
X-ray |
|
1.05374e-02 |
1.989e-02 |
X-ray |
|
5.47191e-02 |
2.253e-01 |
X-ray |
|
5.59237e-02 |
3.943e-01 |
X-ray |
|
6.31238e-02 |
4.197e-02 |
X-ray |
|
6.33831e-02 |
8.112e-02 |
X-ray |
|
6.51063e-02 |
1.827e-02 |
X-ray |
|
9.52600e-02 |
1.772e-01 |
Gamma |
|
2.14070e-01 |
4.580e-01 |
Gamma |
|
2.21130e-01 |
1.113e-02 |
Gamma |
|
2.37630e-01 |
1.663e-02 |
Gamma |
|
2.89290e-01 |
1.406e-02 |
Gamma |
|
3.18810e-01 |
4.369e-02 |
Gamma |
|
5.03000e-01 |
1.113e-02 |
Gamma |
|
5.11000e-01 |
6.833e-01 |
Annihilation photon |
|
6.43260e-01 |
1.901e-02 |
Gamma |
|
7.76080e-01 |
2.102e-02 |
Gamma |
|
8.20440e-01 |
2.656e-02 |
Gamma |
|
8.57210e-01 |
3.664e-02 |
Gamma |
|
8.72100e-01 |
1.191e-02 |
Gamma |
|
8.75500e-01 |
1.053e-02 |
Gamma |
|
9.52250e-01 |
1.626e-02 |
Gamma |
|
9.80010e-01 |
3.238e-02 |
Gamma |
|
9.95520e-01 |
1.818e-02 |
Gamma |
|
1.03439e+00 |
1.695e-02 |
Gamma |
|
1.05006e+00 |
1.937e-02 |
Gamma |
|
1.07530e+00 |
3.050e-02 |
Gamma |
|
1.08558e+00 |
6.733e-02 |
Gamma |
|
1.10930e+00 |
1.237e-01 |
Gamma |
|
1.15385e+00 |
1.099e-02 |
Gamma |
|
1.18654e+00 |
2.240e-02 |
Gamma |
|
1.19427e+00 |
1.255e-02 |
Gamma |
|
1.20990e+00 |
1.328e-02 |
Gamma |
|
1.22760e+00 |
1.053e-02 |
Gamma |
|
1.24049e+00 |
1.759e-02 |
Gamma |
|
1.26420e+00 |
1.722e-02 |
Gamma |
|
1.26600e+00 |
2.153e-02 |
Gamma |
|
1.27762e+00 |
2.372e-02 |
Gamma |
|
1.30225e+00 |
2.116e-02 |
Gamma |
|
1.33041e+00 |
6.733e-02 |
Gamma |
|
1.37522e+00 |
1.731e-02 |
Gamma |
|
1.38704e+00 |
2.244e-02 |
Gamma |
|
1.47957e+00 |
1.983e-02 |
Gamma |
|
1.54460e+00 |
5.450e-02 |
Gamma |
|
1.07908e+00 |
4.299e-02 |
Positron |
|
1.10830e+00 |
1.236e-02 |
Positron |
|
1.17889e+00 |
4.759e-02 |
Positron |
|
1.18844e+00 |
1.006e-02 |
Positron |
|
1.20570e+00 |
1.302e-02 |
Positron |
|
1.28666e+00 |
1.860e-02 |
Positron |
|
1.30999e+00 |
1.444e-02 |
Positron |
|
1.33469e+00 |
2.494e-02 |
Positron |
|
1.39067e+00 |
2.844e-02 |
Positron |
|
1.68562e+00 |
7.111e-02 |
Positron |
|
1.07715e-05 |
1.150e+00 |
Auger electron |
|
2.44609e-05 |
1.631e+00 |
Auger electron |
|
1.59881e-04 |
4.610e+00 |
Auger electron |
|
2.82333e-04 |
1.452e-01 |
Auger electron |
|
3.02790e-04 |
7.793e-01 |
Auger electron |
|
6.54119e-04 |
1.683e-01 |
Auger electron |
|
1.36511e-03 |
2.010e+00 |
Auger electron |
|
1.54369e-03 |
1.060e-01 |
Auger electron |
|
6.18221e-03 |
6.527e-01 |
Auger electron |
|
7.80212e-03 |
2.423e-01 |
Auger electron |
|
9.45209e-03 |
2.267e-02 |
Auger electron |
|
2.97780e-02 |
1.883e-01 |
Conversion electron |
|
4.45281e-02 |
2.499e-02 |
Auger electron |
|
5.31026e-02 |
1.294e-02 |
Auger electron |
|
8.40150e-02 |
1.896e-02 |
Conversion electron |
|
8.44970e-02 |
2.201e-01 |
Conversion electron |
|
8.57017e-02 |
2.057e-01 |
Conversion electron |
|
9.31610e-02 |
1.114e-01 |
Conversion electron |
|
9.52600e-02 |
3.018e-02 |
Conversion electron |
|
1.48588e-01 |
6.324e-02 |
Conversion electron |
|
2.03307e-01 |
1.485e-02 |
Conversion electron |
|
2.04512e-01 |
1.033e-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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