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Radionuclide Dosimetric Data Sheets
Iridium-192
Summary data
General
Classification
Isotope: Ir-192
Atomic number (Z): 77
Mass number (A): 192
Neutron number (N): 115
Radioactive decay
Decay modes: β-, Electron capture
Half-life: 73.83 [d]
Decay constant: 1.0867e-07 [1/s]
Daughters: Pt-192 (95.1%), Os-192 (4.87%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.21769 [MeV]
Mean photon energy: 0.81649 [MeV]
Air kerma rate constant, Γ10: 3.177e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.177e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.488e-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-:
3.488e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.308e-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/Ir-192 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/Ir-192 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-192 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-192 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.01450e-05 |
1.986e+00 |
X-ray |
|
4.40466e-05 |
4.992e-01 |
X-ray |
|
9.43804e-03 |
1.619e-02 |
X-ray |
|
1.11006e-02 |
1.347e-02 |
X-ray |
|
6.16420e-02 |
1.239e-02 |
X-ray |
|
6.31890e-02 |
2.134e-02 |
X-ray |
|
6.53020e-02 |
2.680e-02 |
X-ray |
|
6.70480e-02 |
4.579e-02 |
X-ray |
|
2.05794e-01 |
3.340e-02 |
Gamma |
|
2.95957e-01 |
2.872e-01 |
Gamma |
|
3.08455e-01 |
2.968e-01 |
Gamma |
|
3.16506e-01 |
8.271e-01 |
Gamma |
|
4.68069e-01 |
4.781e-01 |
Gamma |
|
4.84575e-01 |
3.187e-02 |
Gamma |
|
5.88581e-01 |
4.517e-02 |
Gamma |
|
6.04411e-01 |
8.200e-02 |
Gamma |
|
6.12462e-01 |
5.340e-02 |
Gamma |
|
7.15854e-02 |
5.599e-02 |
Beta |
|
1.62059e-01 |
4.143e-01 |
Beta |
|
2.09811e-01 |
4.799e-01 |
Beta |
|
2.96108e-05 |
9.727e-02 |
Auger electron |
|
3.74634e-05 |
4.224e-01 |
Auger electron |
|
5.59843e-05 |
6.831e-01 |
Auger electron |
|
1.63591e-04 |
1.658e-01 |
Auger electron |
|
1.71454e-04 |
3.606e-01 |
Auger electron |
|
3.33768e-04 |
3.309e-02 |
Auger electron |
|
4.09239e-04 |
6.499e-02 |
Auger electron |
|
6.08031e-04 |
1.042e-02 |
Auger electron |
|
8.13788e-04 |
1.808e-02 |
Auger electron |
|
1.58155e-03 |
7.936e-02 |
Auger electron |
|
1.69901e-03 |
1.767e-01 |
Auger electron |
|
1.91108e-03 |
1.686e-02 |
Auger electron |
|
6.88296e-03 |
2.425e-02 |
Auger electron |
|
7.31955e-03 |
5.438e-02 |
Auger electron |
|
9.37192e-03 |
2.246e-02 |
Auger electron |
|
2.17342e-01 |
1.884e-02 |
Conversion electron |
|
2.29840e-01 |
1.806e-02 |
Conversion electron |
|
2.37891e-01 |
4.445e-02 |
Conversion electron |
|
3.89454e-01 |
1.020e-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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