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Radionuclide Dosimetric Data Sheets
Iridium-185
Summary data
General
Classification
Isotope: Ir-185
Atomic number (Z): 77
Mass number (A): 185
Neutron number (N): 108
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 14.4 [h]
Decay constant: 1.3371e-05 [1/s]
Daughters: Os-185 (100.0%)
Radioactive daughters: Os-185
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.12278 [MeV]
Mean photon energy: 0.8581 [MeV]
Air kerma rate constant, Γ10: 4.409e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.500e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.967e-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-:
1.967e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.375e-13
[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/Ir-185 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/Ir-185 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/Ir-185 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.39631e-05 |
2.213e+01 |
X-ray |
|
1.92066e-03 |
9.566e-02 |
X-ray |
|
7.84700e-03 |
1.837e-02 |
X-ray |
|
8.83249e-03 |
3.160e-02 |
X-ray |
|
8.90609e-03 |
2.787e-01 |
X-ray |
|
1.01598e-02 |
1.945e-02 |
X-ray |
|
1.03795e-02 |
1.611e-01 |
X-ray |
|
1.04983e-02 |
2.360e-02 |
X-ray |
|
1.05947e-02 |
5.047e-02 |
X-ray |
|
1.21269e-02 |
3.070e-02 |
X-ray |
|
3.74000e-02 |
3.430e-02 |
Gamma |
|
6.00000e-02 |
5.740e-02 |
Gamma |
|
6.16420e-02 |
3.135e-01 |
X-ray |
|
6.31890e-02 |
5.401e-01 |
X-ray |
|
7.12758e-02 |
5.863e-02 |
X-ray |
|
7.16144e-02 |
1.133e-01 |
X-ray |
|
7.35200e-02 |
1.350e-02 |
X-ray |
|
7.35997e-02 |
2.625e-02 |
X-ray |
|
9.04500e-02 |
1.302e-02 |
Gamma |
|
9.74000e-02 |
4.200e-02 |
Gamma |
|
1.00750e-01 |
2.450e-02 |
Gamma |
|
1.53500e-01 |
2.030e-02 |
Gamma |
|
1.58200e-01 |
2.380e-02 |
Gamma |
|
1.60700e-01 |
1.750e-02 |
Gamma |
|
2.20400e-01 |
1.169e-02 |
Gamma |
|
2.22300e-01 |
1.673e-02 |
Gamma |
|
2.23800e-01 |
2.100e-02 |
Gamma |
|
2.54200e-01 |
1.330e-01 |
Gamma |
|
5.11000e-01 |
4.738e-02 |
Annihilation photon |
|
5.39200e-01 |
1.302e-02 |
Gamma |
|
5.50400e-01 |
1.169e-02 |
Gamma |
|
6.46200e-01 |
1.239e-02 |
Gamma |
|
1.64180e+00 |
1.162e-02 |
Gamma |
|
1.66830e+00 |
3.640e-02 |
Gamma |
|
1.73220e+00 |
2.758e-02 |
Gamma |
|
1.73840e+00 |
2.408e-02 |
Gamma |
|
1.82880e+00 |
1.008e-01 |
Gamma |
|
1.87000e+00 |
1.204e-02 |
Gamma |
|
6.23901e-01 |
1.140e-02 |
Positron |
|
2.96202e-05 |
4.335e+00 |
Auger electron |
|
5.69654e-05 |
1.237e-02 |
Auger electron |
|
1.63601e-04 |
7.326e+00 |
Auger electron |
|
3.37159e-04 |
1.487e+00 |
Auger electron |
|
3.47121e-04 |
2.996e-01 |
Auger electron |
|
5.31649e-04 |
7.284e-01 |
Auger electron |
|
1.58080e-03 |
3.493e+00 |
Auger electron |
|
1.77714e-03 |
2.725e-01 |
Auger electron |
|
2.06622e-03 |
1.412e-02 |
Auger electron |
|
6.90519e-03 |
1.006e+00 |
Auger electron |
|
8.80888e-03 |
4.000e-01 |
Auger electron |
|
1.07457e-02 |
3.927e-02 |
Auger electron |
|
1.63840e-02 |
3.399e-02 |
Conversion electron |
|
2.04340e-02 |
1.415e-02 |
Conversion electron |
|
2.33340e-02 |
3.440e-02 |
Conversion electron |
|
2.44500e-02 |
4.376e-01 |
Conversion electron |
|
2.49760e-02 |
5.440e-02 |
Conversion electron |
|
2.65230e-02 |
1.913e-02 |
Conversion electron |
|
2.66840e-02 |
1.124e-01 |
Conversion electron |
|
3.49483e-02 |
1.179e-01 |
Conversion electron |
|
3.74000e-02 |
3.549e-02 |
Conversion electron |
|
4.70500e-02 |
1.769e-01 |
Conversion electron |
|
4.75760e-02 |
4.430e-02 |
Conversion electron |
|
4.91230e-02 |
2.989e-02 |
Conversion electron |
|
4.99348e-02 |
3.096e-02 |
Auger electron |
|
5.28340e-02 |
1.842e-02 |
Conversion electron |
|
5.38340e-02 |
1.684e-02 |
Conversion electron |
|
5.75483e-02 |
5.927e-02 |
Conversion electron |
|
5.97656e-02 |
1.641e-02 |
Auger electron |
|
6.00000e-02 |
1.763e-02 |
Conversion electron |
|
7.80260e-02 |
2.057e-02 |
Conversion electron |
|
7.94340e-02 |
2.038e-02 |
Conversion electron |
|
7.95730e-02 |
1.824e-02 |
Conversion electron |
|
8.41340e-02 |
2.361e-02 |
Conversion electron |
|
8.49760e-02 |
6.687e-02 |
Conversion electron |
|
8.65230e-02 |
5.883e-02 |
Conversion electron |
|
8.78000e-02 |
1.651e-02 |
Conversion electron |
|
8.79983e-02 |
1.112e-02 |
Conversion electron |
|
9.49483e-02 |
3.338e-02 |
Conversion electron |
|
1.80134e-01 |
4.393e-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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