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Radionuclide Dosimetric Data Sheets
Osmium-185
Summary data
General
Classification
Isotope: Os-185
Atomic number (Z): 76
Mass number (A): 185
Neutron number (N): 109
Radioactive decay
Decay modes: Electron capture
Half-life: 93.6 [d]
Decay constant: 8.5711e-08 [1/s]
Daughters: Re-185 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.0184 [MeV]
Mean photon energy: 0.69172 [MeV]
Air kerma rate constant, Γ10: 3.197e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.197e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.948e-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-:
2.948e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.108e-13
[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-185 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-185 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-185 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
3.75759e-05 |
8.556e+00 |
X-ray |
|
1.84773e-03 |
3.433e-02 |
X-ray |
|
8.57622e-03 |
1.257e-02 |
X-ray |
|
8.64532e-03 |
1.109e-01 |
X-ray |
|
1.00312e-02 |
6.412e-02 |
X-ray |
|
1.02735e-02 |
1.987e-02 |
X-ray |
|
1.17147e-02 |
1.208e-02 |
X-ray |
|
5.98631e-02 |
2.100e-01 |
X-ray |
|
6.13181e-02 |
3.631e-01 |
X-ray |
|
6.91788e-02 |
3.924e-02 |
X-ray |
|
6.94956e-02 |
7.583e-02 |
X-ray |
|
7.14134e-02 |
1.745e-02 |
X-ray |
|
5.92074e-01 |
1.318e-02 |
Gamma |
|
6.46116e-01 |
7.800e-01 |
Gamma |
|
7.17424e-01 |
3.939e-02 |
Gamma |
|
8.74813e-01 |
6.295e-02 |
Gamma |
|
8.80523e-01 |
5.171e-02 |
Gamma |
|
2.73063e-05 |
1.688e+00 |
Auger electron |
|
1.62289e-04 |
2.868e+00 |
Auger electron |
|
3.26344e-04 |
5.680e-01 |
Auger electron |
|
3.30391e-04 |
1.073e-01 |
Auger electron |
|
5.40641e-04 |
2.001e-01 |
Auger electron |
|
1.52529e-03 |
1.355e+00 |
Auger electron |
|
1.71514e-03 |
9.607e-02 |
Auger electron |
|
6.68163e-03 |
4.119e-01 |
Auger electron |
|
8.50814e-03 |
1.606e-01 |
Auger electron |
|
1.03647e-02 |
1.554e-02 |
Auger electron |
|
4.85493e-02 |
2.136e-02 |
Auger electron |
|
5.80540e-02 |
1.125e-02 |
Auger 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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