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Radionuclide Dosimetric Data Sheets
Iridium-182
Summary data
General
Classification
Isotope: Ir-182
Atomic number (Z): 77
Mass number (A): 182
Neutron number (N): 105
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 15.0 [m]
Decay constant: 7.7016e-04 [1/s]
Daughters: Os-182 (100.0%)
Radioactive daughters: Os-182
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.04741 [MeV]
Mean photon energy: 1.4121 [MeV]
Air kerma rate constant, Γ10: 3.889e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.925e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.678e-13 [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-:
1.678e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.262e-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-182 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-182 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-182 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.40880e-05 |
8.837e+00 |
X-ray |
|
1.92180e-03 |
3.841e-02 |
X-ray |
|
8.83249e-03 |
1.317e-02 |
X-ray |
|
8.90608e-03 |
1.161e-01 |
X-ray |
|
1.03795e-02 |
9.722e-02 |
X-ray |
|
1.05947e-02 |
2.104e-02 |
X-ray |
|
1.21269e-02 |
1.853e-02 |
X-ray |
|
6.16420e-02 |
1.714e-01 |
X-ray |
|
6.31890e-02 |
2.953e-01 |
X-ray |
|
7.12758e-02 |
3.206e-02 |
X-ray |
|
7.16144e-02 |
6.197e-02 |
X-ray |
|
7.35997e-02 |
1.435e-02 |
X-ray |
|
1.07000e-01 |
3.102e-02 |
Gamma |
|
1.26900e-01 |
3.560e-01 |
Gamma |
|
1.42400e-01 |
1.019e-02 |
Gamma |
|
1.79800e-01 |
1.204e-02 |
Gamma |
|
2.36300e-01 |
9.723e-02 |
Gamma |
|
2.73500e-01 |
4.630e-01 |
Gamma |
|
2.89000e-01 |
1.158e-02 |
Gamma |
|
2.95200e-01 |
1.204e-02 |
Gamma |
|
3.35400e-01 |
1.296e-02 |
Gamma |
|
3.93800e-01 |
5.463e-02 |
Gamma |
|
3.97000e-01 |
1.111e-02 |
Gamma |
|
4.30000e-01 |
1.250e-02 |
Gamma |
|
4.32700e-01 |
1.088e-02 |
Gamma |
|
5.11000e-01 |
1.052e+00 |
Annihilation photon |
|
5.81100e-01 |
2.315e-02 |
Gamma |
|
5.88400e-01 |
1.528e-02 |
Gamma |
|
6.38600e-01 |
1.065e-02 |
Gamma |
|
7.63700e-01 |
3.241e-02 |
Gamma |
|
7.89900e-01 |
5.973e-02 |
Gamma |
|
8.90600e-01 |
3.010e-02 |
Gamma |
|
9.12000e-01 |
8.102e-02 |
Gamma |
|
9.38900e-01 |
1.621e-02 |
Gamma |
|
9.99000e-01 |
2.593e-02 |
Gamma |
|
1.06330e+00 |
2.778e-02 |
Gamma |
|
1.11800e+00 |
2.732e-02 |
Gamma |
|
1.25130e+00 |
1.370e-02 |
Gamma |
|
1.26580e+00 |
1.667e-02 |
Gamma |
|
1.37500e+00 |
1.111e-02 |
Gamma |
|
1.54600e+00 |
1.250e-02 |
Gamma |
|
1.65200e+00 |
2.685e-02 |
Gamma |
|
1.31400e+00 |
1.012e-02 |
Positron |
|
1.38451e+00 |
1.379e-02 |
Positron |
|
1.42689e+00 |
1.002e-02 |
Positron |
|
1.51242e+00 |
3.554e-02 |
Positron |
|
1.58144e+00 |
3.016e-02 |
Positron |
|
1.64924e+00 |
1.939e-02 |
Positron |
|
1.87436e+00 |
1.992e-01 |
Positron |
|
2.00061e+00 |
1.939e-01 |
Positron |
|
2.95862e-05 |
1.718e+00 |
Auger electron |
|
1.63777e-04 |
2.942e+00 |
Auger electron |
|
3.34915e-04 |
5.868e-01 |
Auger electron |
|
3.42749e-04 |
1.180e-01 |
Auger electron |
|
7.31273e-04 |
1.297e-01 |
Auger electron |
|
1.58396e-03 |
1.403e+00 |
Auger electron |
|
1.78211e-03 |
1.101e-01 |
Auger electron |
|
6.92677e-03 |
4.380e-01 |
Auger electron |
|
8.82703e-03 |
1.741e-01 |
Auger electron |
|
1.07561e-02 |
1.707e-02 |
Auger electron |
|
4.99348e-02 |
1.693e-02 |
Auger electron |
|
5.28340e-02 |
1.832e-01 |
Conversion electron |
|
1.13950e-01 |
2.076e-02 |
Conversion electron |
|
1.14476e-01 |
1.691e-01 |
Conversion electron |
|
1.16023e-01 |
1.361e-01 |
Conversion electron |
|
1.24448e-01 |
8.346e-02 |
Conversion electron |
|
1.26900e-01 |
2.387e-02 |
Conversion electron |
|
1.99434e-01 |
3.474e-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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