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Radionuclide Dosimetric Data Sheets
Osmium-193
Summary data
General
Classification
Isotope: Os-193
Atomic number (Z): 76
Mass number (A): 193
Neutron number (N): 117
Radioactive decay
Decay modes: β-
Half-life: 30.11 [h]
Decay constant: 6.3946e-06 [1/s]
Daughters: Ir-193m (0.348%), Ir-193 (99.7%)
Radioactive daughters: Ir-193m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.37968 [MeV]
Mean photon energy: 0.06742 [MeV]
Air kerma rate constant, Γ10: 4.819e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.819e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.083e-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-:
6.083e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.080e-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-193 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-193 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-193 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-193 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.54188e-05 |
2.875e+00 |
X-ray |
|
1.99529e-03 |
1.349e-02 |
X-ray |
|
9.16923e-03 |
3.849e-02 |
X-ray |
|
1.07358e-02 |
2.819e-02 |
X-ray |
|
6.34550e-02 |
3.734e-02 |
X-ray |
|
6.50999e-02 |
6.405e-02 |
X-ray |
|
7.30400e-02 |
3.239e-02 |
Gamma |
|
7.37750e-02 |
1.351e-02 |
X-ray |
|
1.38920e-01 |
4.266e-02 |
Gamma |
|
2.80444e-01 |
1.244e-02 |
Gamma |
|
3.21590e-01 |
1.276e-02 |
Gamma |
|
3.87480e-01 |
1.260e-02 |
Gamma |
|
4.60490e-01 |
3.950e-02 |
Gamma |
|
5.57360e-01 |
1.303e-02 |
Gamma |
|
1.77562e-01 |
2.390e-02 |
Beta |
|
2.11846e-01 |
7.867e-02 |
Beta |
|
3.16170e-01 |
2.091e-02 |
Beta |
|
3.32002e-01 |
1.235e-01 |
Beta |
|
3.57610e-01 |
1.792e-01 |
Beta |
|
3.86314e-01 |
5.477e-01 |
Beta |
|
3.53931e-05 |
5.488e-01 |
Auger electron |
|
1.71192e-04 |
9.473e-01 |
Auger electron |
|
3.54155e-04 |
1.934e-01 |
Auger electron |
|
3.61924e-04 |
4.228e-02 |
Auger electron |
|
6.44303e-04 |
7.103e-02 |
Auger electron |
|
1.64437e-03 |
4.562e-01 |
Auger electron |
|
1.84577e-03 |
4.028e-02 |
Auger electron |
|
7.12402e-03 |
1.354e-01 |
Auger electron |
|
9.10178e-03 |
5.498e-02 |
Auger electron |
|
3.06940e-02 |
2.710e-02 |
Conversion electron |
|
5.96440e-02 |
4.996e-02 |
Conversion electron |
|
6.01810e-02 |
5.563e-02 |
Conversion electron |
|
6.18260e-02 |
4.894e-02 |
Conversion electron |
|
6.26060e-02 |
8.160e-02 |
Conversion electron |
|
7.05010e-02 |
3.842e-02 |
Conversion electron |
|
7.30400e-02 |
1.127e-02 |
Conversion electron |
|
1.25524e-01 |
1.203e-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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