<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Osmium-189m
Summary data
General
Classification
Isotope: Os-189m
Atomic number (Z): 76
Mass number (A): 189
Neutron number (N): 113
Radioactive decay
Decay modes: Internal transition
Half-life: 5.8 [h]
Decay constant: 3.3197e-05 [1/s]
Daughters: Os-189 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.0286 [MeV]
Mean photon energy: 0.00225 [MeV]
Air kerma rate constant, Γ10: 2.381e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.381e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.582e-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-:
4.582e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.605e-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-189m 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-189m 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-189m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.40064e-05 |
7.246e+00 |
X-ray |
|
1.91512e-03 |
3.164e-02 |
X-ray |
|
8.83249e-03 |
1.518e-02 |
X-ray |
|
8.90610e-03 |
1.338e-01 |
X-ray |
|
1.05947e-02 |
2.424e-02 |
X-ray |
|
2.97135e-05 |
1.411e+00 |
Auger electron |
|
1.62490e-04 |
2.405e+00 |
Auger electron |
|
3.16752e-04 |
4.819e-01 |
Auger electron |
|
3.35825e-04 |
9.257e-02 |
Auger electron |
|
4.72689e-04 |
8.614e-02 |
Auger electron |
|
1.57512e-03 |
1.166e+00 |
Auger electron |
|
1.76956e-03 |
9.153e-02 |
Auger electron |
|
6.54807e-03 |
3.501e-01 |
Auger electron |
|
8.42077e-03 |
1.377e-01 |
Auger electron |
|
1.03145e-02 |
1.339e-02 |
Auger electron |
|
1.78600e-02 |
1.084e-01 |
Conversion electron |
|
1.83860e-02 |
1.248e-02 |
Conversion electron |
|
1.99330e-02 |
5.831e-01 |
Conversion electron |
|
2.83583e-02 |
2.278e-01 |
Conversion electron |
|
3.08100e-02 |
6.817e-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)
<= Return to MIRDspec isotope database
