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Radionuclide Dosimetric Data Sheets
Tungsten-179
Summary data
General
Classification
Isotope: W-179
Atomic number (Z): 74
Mass number (A): 179
Neutron number (N): 105
Radioactive decay
Decay modes: Electron capture
Half-life: 37.05 [m]
Decay constant: 3.1181e-04 [1/s]
Daughters: Ta-179 (100.0%)
Radioactive daughters: Ta-179
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.03257 [MeV]
Mean photon energy: 0.05539 [MeV]
Air kerma rate constant, Γ10: 4.168e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.168e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 5.218e-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-:
5.218e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 8.874e-15
[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/W-179 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/W-179 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/W-179 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.49950e-05 |
1.565e+01 |
X-ray |
|
1.70636e-03 |
5.212e-02 |
X-ray |
|
7.19450e-03 |
1.173e-02 |
X-ray |
|
8.07690e-03 |
1.971e-02 |
X-ray |
|
8.13762e-03 |
1.740e-01 |
X-ray |
|
9.36070e-03 |
1.065e-01 |
X-ray |
|
9.47190e-03 |
1.128e-02 |
X-ray |
|
9.64848e-03 |
3.054e-02 |
X-ray |
|
1.09205e-02 |
1.960e-02 |
X-ray |
|
3.07000e-02 |
1.800e-01 |
Gamma |
|
5.64020e-02 |
2.245e-01 |
X-ray |
|
5.76858e-02 |
3.912e-01 |
X-ray |
|
6.51037e-02 |
4.187e-02 |
X-ray |
|
6.53809e-02 |
8.090e-02 |
X-ray |
|
6.71676e-02 |
1.834e-02 |
X-ray |
|
1.19707e-05 |
1.364e+00 |
Auger electron |
|
2.73580e-05 |
1.933e+00 |
Auger electron |
|
1.60448e-04 |
5.322e+00 |
Auger electron |
|
3.00321e-04 |
1.747e-01 |
Auger electron |
|
3.11293e-04 |
9.942e-01 |
Auger electron |
|
6.00136e-04 |
3.150e-01 |
Auger electron |
|
1.41705e-03 |
2.410e+00 |
Auger electron |
|
1.59730e-03 |
1.395e-01 |
Auger electron |
|
6.34062e-03 |
7.491e-01 |
Auger electron |
|
8.02967e-03 |
2.826e-01 |
Auger electron |
|
9.74980e-03 |
2.675e-02 |
Auger electron |
|
1.90440e-02 |
2.216e-01 |
Conversion electron |
|
1.95370e-02 |
1.765e-01 |
Conversion electron |
|
2.08208e-02 |
2.410e-01 |
Conversion electron |
|
2.85159e-02 |
1.487e-01 |
Conversion electron |
|
3.07000e-02 |
4.014e-02 |
Conversion electron |
|
4.58458e-02 |
2.390e-02 |
Auger electron |
|
5.47234e-02 |
1.245e-02 |
Auger 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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