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Radionuclide Dosimetric Data Sheets
Osmium-191
Summary data
General
Classification
Isotope: Os-191
Atomic number (Z): 76
Mass number (A): 191
Neutron number (N): 115
Radioactive decay
Decay modes: β-
Half-life: 15.4 [d]
Decay constant: 5.2094e-07 [1/s]
Daughters: Ir-191 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.13716 [MeV]
Mean photon energy: 0.0843 [MeV]
Air kerma rate constant, Γ10: 1.393e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.393e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.198e-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-:
2.198e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.351e-14
[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/Os-191 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/Os-191 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-191 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-191 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.54790e-05 |
1.259e+01 |
X-ray |
|
1.99600e-03 |
5.910e-02 |
X-ray |
|
8.06831e-03 |
1.131e-02 |
X-ray |
|
9.09081e-03 |
1.953e-02 |
X-ray |
|
9.16922e-03 |
1.722e-01 |
X-ray |
|
1.07358e-02 |
1.474e-01 |
X-ray |
|
1.09194e-02 |
3.152e-02 |
X-ray |
|
1.25485e-02 |
2.842e-02 |
X-ray |
|
6.34550e-02 |
1.823e-01 |
X-ray |
|
6.50999e-02 |
3.127e-01 |
X-ray |
|
7.34138e-02 |
3.411e-02 |
X-ray |
|
7.37750e-02 |
6.595e-02 |
X-ray |
|
7.58295e-02 |
1.539e-02 |
X-ray |
|
1.29431e-01 |
2.900e-01 |
Gamma |
|
3.77625e-02 |
1.000e+00 |
Beta |
|
3.53745e-05 |
2.394e+00 |
Auger electron |
|
1.71296e-04 |
4.166e+00 |
Auger electron |
|
3.52702e-04 |
8.413e-01 |
Auger electron |
|
3.59301e-04 |
1.839e-01 |
Auger electron |
|
8.29982e-04 |
1.654e-01 |
Auger electron |
|
1.64643e-03 |
2.001e+00 |
Auger electron |
|
1.84919e-03 |
1.773e-01 |
Auger electron |
|
7.12568e-03 |
6.135e-01 |
Auger electron |
|
9.10063e-03 |
2.490e-01 |
Auger electron |
|
1.11040e-02 |
2.474e-02 |
Auger electron |
|
2.89870e-02 |
3.133e-01 |
Conversion electron |
|
3.06320e-02 |
3.193e-01 |
Conversion electron |
|
3.93070e-02 |
1.976e-01 |
Conversion electron |
|
4.18460e-02 |
5.818e-02 |
Conversion electron |
|
5.13520e-02 |
1.750e-02 |
Auger electron |
|
5.31170e-02 |
6.528e-01 |
Conversion electron |
|
1.16035e-01 |
9.630e-02 |
Conversion electron |
|
1.16572e-01 |
2.773e-02 |
Conversion electron |
|
1.18217e-01 |
1.587e-02 |
Conversion electron |
|
1.26892e-01 |
3.333e-02 |
Conversion electron |
|
1.29431e-01 |
1.000e-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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