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Radionuclide Dosimetric Data Sheets
Iridium-186
Summary data
General
Classification
Isotope: Ir-186
Atomic number (Z): 77
Mass number (A): 186
Neutron number (N): 109
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 16.64 [h]
Decay constant: 1.1571e-05 [1/s]
Daughters: Os-186 (100.0%)
Radioactive daughters: Os-186
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.14525 [MeV]
Mean photon energy: 1.66514 [MeV]
Air kerma rate constant, Γ10: 6.596e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.815e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.327e-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-:
2.327e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.668e-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-186 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-186 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-186 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.40816e-05 |
1.214e+01 |
X-ray |
|
1.92111e-03 |
5.284e-02 |
X-ray |
|
7.84700e-03 |
1.081e-02 |
X-ray |
|
8.83249e-03 |
1.859e-02 |
X-ray |
|
8.90608e-03 |
1.639e-01 |
X-ray |
|
1.03795e-02 |
1.225e-01 |
X-ray |
|
1.05947e-02 |
2.969e-02 |
X-ray |
|
1.21269e-02 |
2.335e-02 |
X-ray |
|
6.16420e-02 |
2.805e-01 |
X-ray |
|
6.31890e-02 |
4.832e-01 |
X-ray |
|
7.12758e-02 |
5.246e-02 |
X-ray |
|
7.16144e-02 |
1.014e-01 |
X-ray |
|
7.35200e-02 |
1.208e-02 |
X-ray |
|
7.35997e-02 |
2.348e-02 |
X-ray |
|
1.37157e-01 |
4.141e-01 |
Gamma |
|
2.76540e-01 |
1.548e-02 |
Gamma |
|
2.96900e-01 |
6.231e-01 |
Gamma |
|
3.51730e-01 |
1.161e-02 |
Gamma |
|
4.20810e-01 |
2.864e-02 |
Gamma |
|
4.34840e-01 |
3.386e-01 |
Gamma |
|
4.41500e-01 |
1.625e-02 |
Gamma |
|
4.89600e-01 |
1.200e-02 |
Gamma |
|
5.11000e-01 |
1.134e-01 |
Annihilation photon |
|
5.84420e-01 |
5.379e-02 |
Gamma |
|
6.22330e-01 |
3.173e-02 |
Gamma |
|
6.30350e-01 |
4.373e-02 |
Gamma |
|
6.36380e-01 |
6.076e-02 |
Gamma |
|
6.49800e-01 |
1.354e-02 |
Gamma |
|
6.71400e-01 |
1.238e-02 |
Gamma |
|
7.67510e-01 |
5.186e-02 |
Gamma |
|
7.73280e-01 |
8.862e-02 |
Gamma |
|
8.05500e-01 |
1.161e-02 |
Gamma |
|
8.41500e-01 |
4.915e-02 |
Gamma |
|
9.33340e-01 |
5.263e-02 |
Gamma |
|
1.02650e+00 |
1.192e-02 |
Gamma |
|
1.05725e+00 |
3.057e-02 |
Gamma |
|
1.17150e+00 |
1.471e-02 |
Gamma |
|
1.18790e+00 |
1.974e-02 |
Gamma |
|
1.18790e+00 |
1.974e-02 |
Gamma |
|
1.31440e+00 |
1.625e-02 |
Gamma |
|
1.32370e+00 |
1.161e-02 |
Gamma |
|
1.64740e+00 |
4.683e-02 |
Gamma |
|
1.70100e+00 |
2.090e-02 |
Gamma |
|
2.24200e+00 |
1.432e-02 |
Gamma |
|
8.79007e-01 |
2.922e-02 |
Positron |
|
1.07296e+00 |
1.066e-02 |
Positron |
|
2.95973e-05 |
2.360e+00 |
Auger electron |
|
1.63682e-04 |
4.037e+00 |
Auger electron |
|
3.33837e-04 |
8.026e-01 |
Auger electron |
|
3.42759e-04 |
1.618e-01 |
Auger electron |
|
6.77842e-04 |
2.014e-01 |
Auger electron |
|
1.58276e-03 |
1.931e+00 |
Auger electron |
|
1.78010e-03 |
1.513e-01 |
Auger electron |
|
6.90293e-03 |
6.003e-01 |
Auger electron |
|
8.80218e-03 |
2.385e-01 |
Auger electron |
|
1.07302e-02 |
2.337e-02 |
Auger electron |
|
4.99348e-02 |
2.770e-02 |
Auger electron |
|
5.97656e-02 |
1.468e-02 |
Auger electron |
|
6.30910e-02 |
1.793e-01 |
Conversion electron |
|
1.24207e-01 |
2.031e-02 |
Conversion electron |
|
1.24733e-01 |
1.385e-01 |
Conversion electron |
|
1.26280e-01 |
1.083e-01 |
Conversion electron |
|
1.34705e-01 |
6.826e-02 |
Conversion electron |
|
1.37157e-01 |
1.955e-02 |
Conversion electron |
|
2.22834e-01 |
3.789e-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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