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Radionuclide Dosimetric Data Sheets
Iridium-192m
Summary data
General
Classification
Isotope: Ir-192m
Atomic number (Z): 77
Mass number (A): 192
Neutron number (N): 115
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 1.45 [m]
Decay constant: 7.9672e-03 [1/s]
Daughters: Ir-192 (100.0%), Pt-192 (0.0175%)
Radioactive daughters: Ir-192
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.05395 [MeV]
Mean photon energy: 0.00292 [MeV]
Air kerma rate constant, Γ10: 7.040e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.040e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.644e-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-:
8.644e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.678e-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/Ir-192m 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-192m 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-192m 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-192m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.54674e-05 |
6.898e+00 |
X-ray |
|
1.99877e-03 |
3.210e-02 |
X-ray |
|
9.16921e-03 |
8.377e-02 |
X-ray |
|
1.07358e-02 |
1.003e-01 |
X-ray |
|
1.09194e-02 |
1.533e-02 |
X-ray |
|
1.25485e-02 |
1.934e-02 |
X-ray |
|
3.53472e-05 |
1.313e+00 |
Auger electron |
|
1.71653e-04 |
2.291e+00 |
Auger electron |
|
3.57859e-04 |
4.698e-01 |
Auger electron |
|
3.60408e-04 |
1.017e-01 |
Auger electron |
|
1.17015e-03 |
5.582e-02 |
Auger electron |
|
1.65092e-03 |
1.086e+00 |
Auger electron |
|
1.85652e-03 |
9.665e-02 |
Auger electron |
|
7.21355e-03 |
3.321e-01 |
Auger electron |
|
9.19229e-03 |
1.350e-01 |
Auger electron |
|
1.12005e-02 |
1.344e-02 |
Auger electron |
|
4.38510e-02 |
3.710e-01 |
Conversion electron |
|
4.54960e-02 |
3.449e-01 |
Conversion electron |
|
5.41710e-02 |
2.128e-01 |
Conversion electron |
|
5.67100e-02 |
6.251e-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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