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Radionuclide Dosimetric Data Sheets
Tungsten-179m
Summary data
General
Classification
Isotope: W-179m
Atomic number (Z): 74
Mass number (A): 179
Neutron number (N): 105
Radioactive decay
Decay modes: Electron capture, Internal transition
Half-life: 6.4 [m]
Decay constant: 1.8051e-03 [1/s]
Daughters: W-179 (99.7%), Ta-179 (0.28%)
Radioactive daughters: W-179, Ta-179
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.16608 [MeV]
Mean photon energy: 0.05605 [MeV]
Air kerma rate constant, Γ10: 2.659e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.659e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.661e-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-:
2.661e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 8.980e-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-179m 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-179m 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-179m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.46653e-05 |
4.378e-02 |
X-ray |
|
3.12337e-05 |
7.557e+00 |
X-ray |
|
1.77602e-03 |
2.794e-02 |
X-ray |
|
8.32492e-03 |
1.073e-02 |
X-ray |
|
8.38982e-03 |
9.469e-02 |
X-ray |
|
9.69190e-03 |
5.231e-02 |
X-ray |
|
9.95867e-03 |
1.679e-02 |
X-ray |
|
5.81161e-02 |
1.569e-01 |
X-ray |
|
5.94830e-02 |
2.725e-01 |
X-ray |
|
6.71212e-02 |
2.930e-02 |
X-ray |
|
6.74178e-02 |
5.662e-02 |
X-ray |
|
6.92695e-02 |
1.293e-02 |
X-ray |
|
2.21500e-01 |
8.567e-02 |
Gamma |
|
2.53884e-05 |
1.500e+00 |
Auger electron |
|
1.60341e-04 |
1.485e-02 |
Auger electron |
|
1.61221e-04 |
2.565e+00 |
Auger electron |
|
3.14994e-04 |
8.894e-02 |
Auger electron |
|
3.17347e-04 |
5.004e-01 |
Auger electron |
|
6.46761e-04 |
1.323e-01 |
Auger electron |
|
1.47069e-03 |
1.193e+00 |
Auger electron |
|
1.65519e-03 |
7.658e-02 |
Auger electron |
|
6.48707e-03 |
3.684e-01 |
Auger electron |
|
8.24203e-03 |
1.412e-01 |
Auger electron |
|
1.00266e-02 |
1.350e-02 |
Auger electron |
|
4.71853e-02 |
1.647e-02 |
Auger electron |
|
1.51811e-01 |
5.648e-01 |
Conversion electron |
|
2.09423e-01 |
1.539e-01 |
Conversion electron |
|
2.09927e-01 |
2.903e-02 |
Conversion electron |
|
2.11294e-01 |
6.740e-02 |
Conversion electron |
|
2.19229e-01 |
6.467e-02 |
Conversion electron |
|
2.21500e-01 |
1.900e-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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