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Radionuclide Dosimetric Data Sheets
Osmium-194
Summary data
General
Classification
Isotope: Os-194
Atomic number (Z): 76
Mass number (A): 194
Neutron number (N): 118
Radioactive decay
Decay modes: β-
Half-life: 6.0 [y]
Decay constant: 3.6608e-09 [1/s]
Daughters: Ir-194 (100.0%)
Radioactive daughters: Ir-194
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.04533 [MeV]
Mean photon energy: 0.00451 [MeV]
Air kerma rate constant, Γ10: 4.203e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.203e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.263e-15 [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-:
7.263e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.226e-16
[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-194 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-194 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-194 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-194 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.51849e-05 |
6.662e+00 |
X-ray |
|
1.99395e-03 |
3.095e-02 |
X-ray |
|
9.16924e-03 |
7.746e-02 |
X-ray |
|
1.04958e-02 |
1.253e-02 |
X-ray |
|
1.07358e-02 |
2.228e-02 |
X-ray |
|
1.08570e-02 |
1.495e-02 |
X-ray |
|
1.09194e-02 |
1.418e-02 |
X-ray |
|
4.31000e-02 |
5.400e-02 |
Gamma |
|
1.36559e-02 |
7.591e-01 |
Beta |
|
2.51324e-02 |
2.397e-01 |
Beta |
|
3.54411e-05 |
1.291e+00 |
Auger electron |
|
1.70972e-04 |
2.171e+00 |
Auger electron |
|
3.60906e-04 |
4.646e-01 |
Auger electron |
|
3.70390e-04 |
1.005e-01 |
Auger electron |
|
5.16253e-04 |
3.979e-01 |
Auger electron |
|
1.63953e-03 |
1.045e+00 |
Auger electron |
|
1.83820e-03 |
9.144e-02 |
Auger electron |
|
7.12259e-03 |
2.614e-01 |
Auger electron |
|
9.11161e-03 |
1.062e-01 |
Auger electron |
|
1.11425e-02 |
1.061e-02 |
Auger electron |
|
2.97040e-02 |
4.983e-01 |
Conversion electron |
|
3.02410e-02 |
4.762e-02 |
Conversion electron |
|
4.05610e-02 |
1.272e-01 |
Conversion electron |
|
4.31000e-02 |
3.883e-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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