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Radionuclide Dosimetric Data Sheets
Osmium-181
Summary data
General
Classification
Isotope: Os-181
Atomic number (Z): 76
Mass number (A): 181
Neutron number (N): 105
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 105.0 [m]
Decay constant: 1.1002e-04 [1/s]
Daughters: Re-181 (100.0%)
Radioactive daughters: Re-181
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.09182 [MeV]
Mean photon energy: 1.3835 [MeV]
Air kerma rate constant, Γ10: 5.864e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.948e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.471e-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-:
1.471e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.217e-13
[Gy·kg/Bq·s]
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/Os-181 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/Os-181 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/Os-181 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
3.76175e-05 |
1.430e+01 |
X-ray |
|
1.84805e-03 |
5.753e-02 |
X-ray |
|
7.62641e-03 |
1.237e-02 |
X-ray |
|
8.57622e-03 |
2.115e-02 |
X-ray |
|
8.64532e-03 |
1.865e-01 |
X-ray |
|
1.00312e-02 |
1.245e-01 |
X-ray |
|
1.02735e-02 |
3.343e-02 |
X-ray |
|
1.17147e-02 |
2.344e-02 |
X-ray |
|
5.98631e-02 |
3.424e-01 |
X-ray |
|
6.13181e-02 |
5.920e-01 |
X-ray |
|
6.91788e-02 |
6.398e-02 |
X-ray |
|
6.94956e-02 |
1.236e-01 |
X-ray |
|
7.13392e-02 |
1.464e-02 |
X-ray |
|
7.14134e-02 |
2.844e-02 |
X-ray |
|
7.57300e-02 |
1.818e-02 |
Gamma |
|
1.18010e-01 |
1.293e-01 |
Gamma |
|
1.45020e-01 |
1.414e-02 |
Gamma |
|
1.67230e-01 |
3.030e-02 |
Gamma |
|
2.28730e-01 |
1.616e-02 |
Gamma |
|
2.33630e-01 |
1.818e-02 |
Gamma |
|
2.38750e-01 |
4.444e-01 |
Gamma |
|
2.42740e-01 |
6.060e-02 |
Gamma |
|
2.67650e-01 |
1.010e-02 |
Gamma |
|
3.56700e-01 |
1.616e-02 |
Gamma |
|
4.34500e-01 |
1.919e-02 |
Gamma |
|
5.11000e-01 |
4.336e-02 |
Annihilation photon |
|
6.75400e-01 |
1.555e-02 |
Gamma |
|
7.28600e-01 |
1.030e-02 |
Gamma |
|
7.51400e-01 |
3.232e-02 |
Gamma |
|
7.59500e-01 |
2.424e-02 |
Gamma |
|
7.87600e-01 |
5.252e-02 |
Gamma |
|
7.96900e-01 |
1.212e-02 |
Gamma |
|
8.27000e-01 |
2.020e-01 |
Gamma |
|
8.31500e-01 |
7.676e-02 |
Gamma |
|
8.68000e-01 |
2.020e-02 |
Gamma |
|
8.72200e-01 |
2.424e-02 |
Gamma |
|
9.20300e-01 |
1.313e-02 |
Gamma |
|
9.41500e-01 |
1.030e-02 |
Gamma |
|
9.55000e-01 |
5.050e-02 |
Gamma |
|
9.71000e-01 |
1.232e-02 |
Gamma |
|
9.90600e-01 |
1.495e-02 |
Gamma |
|
1.03050e+00 |
1.656e-02 |
Gamma |
|
1.06040e+00 |
5.656e-02 |
Gamma |
|
1.08620e+00 |
1.293e-02 |
Gamma |
|
1.11090e+00 |
2.121e-02 |
Gamma |
|
1.18150e+00 |
1.030e-02 |
Gamma |
|
1.30500e+00 |
1.818e-02 |
Gamma |
|
1.34520e+00 |
1.091e-02 |
Gamma |
|
1.38530e+00 |
1.212e-02 |
Gamma |
|
1.49180e+00 |
1.030e-02 |
Gamma |
|
1.56800e+00 |
1.030e-02 |
Gamma |
|
1.57300e+00 |
1.091e-02 |
Gamma |
|
1.70490e+00 |
1.414e-02 |
Gamma |
|
1.74060e+00 |
1.252e-02 |
Gamma |
|
1.98170e+00 |
1.212e-02 |
Gamma |
|
6.86402e-01 |
1.143e-02 |
Positron |
|
2.72929e-05 |
2.813e+00 |
Auger electron |
|
1.62367e-04 |
4.801e+00 |
Auger electron |
|
3.25668e-04 |
9.436e-01 |
Auger electron |
|
3.28788e-04 |
1.783e-01 |
Auger electron |
|
6.00521e-04 |
2.592e-01 |
Auger electron |
|
1.52626e-03 |
2.271e+00 |
Auger electron |
|
1.71659e-03 |
1.613e-01 |
Auger electron |
|
3.87400e-03 |
1.711e-02 |
Conversion electron |
|
6.69402e-03 |
7.068e-01 |
Auger electron |
|
8.51998e-03 |
2.757e-01 |
Auger electron |
|
1.03749e-02 |
2.667e-02 |
Auger electron |
|
2.81440e-02 |
1.354e-02 |
Conversion electron |
|
3.26440e-02 |
1.271e-02 |
Conversion electron |
|
4.61540e-02 |
3.464e-01 |
Conversion electron |
|
4.85493e-02 |
3.483e-02 |
Auger electron |
|
5.80540e-02 |
1.835e-02 |
Auger electron |
|
6.37370e-02 |
8.554e-02 |
Conversion electron |
|
6.51920e-02 |
8.208e-02 |
Conversion electron |
|
7.33695e-02 |
4.360e-02 |
Conversion electron |
|
7.57300e-02 |
1.226e-02 |
Conversion electron |
|
9.53740e-02 |
1.869e-02 |
Conversion electron |
|
1.05502e-01 |
5.046e-02 |
Conversion electron |
|
1.15650e-01 |
1.443e-02 |
Conversion electron |
|
1.66894e-01 |
1.534e-02 |
Conversion electron |
|
1.70884e-01 |
1.875e-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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