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Radionuclide Dosimetric Data Sheets
Osmium-191m
Summary data
General
Classification
Isotope: Os-191m
Atomic number (Z): 76
Mass number (A): 191
Neutron number (N): 115
Radioactive decay
Decay modes: Internal transition
Half-life: 13.1 [h]
Decay constant: 1.4698e-05 [1/s]
Daughters: Os-191 (100.0%)
Radioactive daughters: Os-191
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.06635 [MeV]
Mean photon energy: 0.00803 [MeV]
Air kerma rate constant, Γ10: 3.869e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.869e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.063e-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-:
1.063e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.287e-15
[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-191m 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/Os-191m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.39534e-05 |
7.739e+00 |
X-ray |
|
1.91737e-03 |
3.358e-02 |
X-ray |
|
8.83249e-03 |
1.406e-02 |
X-ray |
|
8.90609e-03 |
1.240e-01 |
X-ray |
|
1.03795e-02 |
2.139e-02 |
X-ray |
|
1.05947e-02 |
2.245e-02 |
X-ray |
|
6.16420e-02 |
2.495e-02 |
X-ray |
|
6.31890e-02 |
4.299e-02 |
X-ray |
|
2.96807e-05 |
1.514e+00 |
Auger electron |
|
1.62922e-04 |
2.564e+00 |
Auger electron |
|
3.14005e-04 |
8.977e-02 |
Conversion electron |
|
3.26138e-04 |
5.214e-01 |
Auger electron |
|
3.41711e-04 |
1.017e-01 |
Auger electron |
|
4.93411e-04 |
1.783e-01 |
Auger electron |
|
1.57717e-03 |
1.233e+00 |
Auger electron |
|
1.77244e-03 |
9.650e-02 |
Auger electron |
|
6.67793e-03 |
3.595e-01 |
Auger electron |
|
8.56370e-03 |
1.420e-01 |
Auger electron |
|
1.04760e-02 |
1.386e-02 |
Auger electron |
|
6.14300e-02 |
2.156e-01 |
Conversion electron |
|
6.19560e-02 |
3.731e-02 |
Conversion electron |
|
6.35030e-02 |
4.043e-01 |
Conversion electron |
|
7.19283e-02 |
1.936e-01 |
Conversion electron |
|
7.43800e-02 |
5.807e-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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