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Radionuclide Dosimetric Data Sheets
Tungsten-177
Summary data
General
Classification
Isotope: W-177
Atomic number (Z): 74
Mass number (A): 177
Neutron number (N): 103
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 132.0 [m]
Decay constant: 8.7519e-05 [1/s]
Daughters: Ta-177 (100.0%)
Radioactive daughters: Ta-177
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.09698 [MeV]
Mean photon energy: 0.9185 [MeV]
Air kerma rate constant, Γ10: 3.487e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.496e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.554e-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-:
1.554e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.472e-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/W-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/W-177 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/W-177 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/W-177 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
2.50527e-05 |
2.294e+01 |
X-ray |
|
1.70688e-03 |
7.682e-02 |
X-ray |
|
7.19450e-03 |
1.763e-02 |
X-ray |
|
8.07691e-03 |
2.964e-02 |
X-ray |
|
8.13762e-03 |
2.616e-01 |
X-ray |
|
9.36070e-03 |
1.865e-01 |
X-ray |
|
9.64848e-03 |
4.592e-02 |
X-ray |
|
1.09205e-02 |
3.432e-02 |
X-ray |
|
5.64020e-02 |
4.386e-01 |
X-ray |
|
5.76858e-02 |
7.645e-01 |
X-ray |
|
6.51037e-02 |
8.182e-02 |
X-ray |
|
6.53809e-02 |
1.581e-01 |
X-ray |
|
6.71036e-02 |
1.850e-02 |
X-ray |
|
6.71676e-02 |
3.584e-02 |
X-ray |
|
7.04500e-02 |
6.363e-02 |
Gamma |
|
1.15050e-01 |
8.585e-02 |
Gamma |
|
1.15650e-01 |
5.050e-01 |
Gamma |
|
1.42600e-01 |
1.363e-02 |
Gamma |
|
1.55950e-01 |
3.939e-02 |
Gamma |
|
1.86200e-01 |
8.484e-02 |
Gamma |
|
1.86420e-01 |
7.777e-02 |
Gamma |
|
2.23230e-01 |
2.222e-02 |
Gamma |
|
2.71020e-01 |
3.979e-02 |
Gamma |
|
3.11280e-01 |
1.384e-02 |
Gamma |
|
3.67520e-01 |
4.242e-02 |
Gamma |
|
3.77350e-01 |
4.646e-02 |
Gamma |
|
3.88800e-01 |
1.687e-02 |
Gamma |
|
4.17160e-01 |
6.161e-02 |
Gamma |
|
4.26980e-01 |
1.323e-01 |
Gamma |
|
4.50600e-01 |
1.303e-02 |
Gamma |
|
4.73500e-01 |
1.303e-02 |
Gamma |
|
5.28500e-01 |
2.384e-02 |
Gamma |
|
6.11800e-01 |
5.959e-02 |
Gamma |
|
6.47300e-01 |
2.565e-02 |
Gamma |
|
6.72150e-01 |
1.970e-02 |
Gamma |
|
7.21600e-01 |
1.182e-02 |
Gamma |
|
7.85900e-01 |
1.040e-02 |
Gamma |
|
8.27900e-01 |
1.040e-02 |
Gamma |
|
8.36200e-01 |
1.020e-02 |
Gamma |
|
8.77200e-01 |
1.222e-02 |
Gamma |
|
8.80200e-01 |
1.222e-02 |
Gamma |
|
1.01490e+00 |
4.818e-02 |
Gamma |
|
1.03640e+00 |
1.030e-01 |
Gamma |
|
1.06690e+00 |
3.121e-02 |
Gamma |
|
1.18250e+00 |
3.737e-02 |
Gamma |
|
1.18925e-05 |
1.989e+00 |
Auger electron |
|
2.73572e-05 |
2.828e+00 |
Auger electron |
|
1.60550e-04 |
7.819e+00 |
Auger electron |
|
2.98153e-04 |
2.540e-01 |
Auger electron |
|
3.09962e-04 |
1.458e+00 |
Auger electron |
|
6.76259e-04 |
3.083e-01 |
Auger electron |
|
1.41850e-03 |
3.550e+00 |
Auger electron |
|
1.59948e-03 |
2.063e-01 |
Auger electron |
|
1.83893e-03 |
1.223e-02 |
Auger electron |
|
2.88500e-03 |
5.207e-01 |
Conversion electron |
|
6.33997e-03 |
1.138e+00 |
Auger electron |
|
8.02648e-03 |
4.291e-01 |
Auger electron |
|
9.74241e-03 |
4.057e-02 |
Auger electron |
|
1.92870e-02 |
1.946e-01 |
Conversion electron |
|
2.05708e-02 |
2.333e-01 |
Conversion electron |
|
2.82659e-02 |
1.074e-01 |
Conversion electron |
|
3.04500e-02 |
2.920e-02 |
Conversion electron |
|
3.41850e-02 |
1.065e-02 |
Conversion electron |
|
4.58458e-02 |
4.671e-02 |
Auger electron |
|
4.74850e-02 |
1.807e-02 |
Conversion electron |
|
4.80850e-02 |
1.049e-01 |
Conversion electron |
|
5.47234e-02 |
2.433e-02 |
Auger electron |
|
5.87940e-02 |
7.521e-02 |
Conversion electron |
|
5.92870e-02 |
9.183e-02 |
Conversion electron |
|
6.05708e-02 |
8.658e-02 |
Conversion electron |
|
6.82659e-02 |
6.189e-02 |
Conversion electron |
|
7.04500e-02 |
1.731e-02 |
Conversion electron |
|
7.50350e-02 |
1.524e-02 |
Conversion electron |
|
8.83850e-02 |
3.245e-02 |
Conversion electron |
|
1.03994e-01 |
1.133e-02 |
Conversion electron |
|
1.18855e-01 |
3.685e-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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