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Radionuclide Dosimetric Data Sheets
Iridium-192n
Summary data
General
Classification
Isotope: Ir-192n
Atomic number (Z): 77
Mass number (A): 192
Neutron number (N): 115
Radioactive decay
Decay modes: Internal transition
Half-life: 241.0 [y]
Decay constant: 9.1141e-11 [1/s]
Daughters: Ir-192 (100.0%)
Radioactive daughters: Ir-192
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.16166 [MeV]
Mean photon energy: 0.00657 [MeV]
Air kerma rate constant, Γ10: 1.509e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.509e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.590e-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-:
2.590e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.053e-15
[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-192n 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-192n Summary 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-192n Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.56435e-05 |
1.405e+01 |
X-ray |
|
1.99926e-03 |
6.666e-02 |
X-ray |
|
8.06832e-03 |
1.099e-02 |
X-ray |
|
9.09081e-03 |
1.898e-02 |
X-ray |
|
9.16921e-03 |
1.673e-01 |
X-ray |
|
1.07358e-02 |
2.168e-01 |
X-ray |
|
1.09194e-02 |
3.063e-02 |
X-ray |
|
1.25485e-02 |
4.182e-02 |
X-ray |
|
3.53589e-05 |
2.651e+00 |
Auger electron |
|
1.25001e-04 |
3.284e-01 |
Conversion electron |
|
1.71558e-04 |
4.646e+00 |
Auger electron |
|
3.59247e-04 |
9.715e-01 |
Auger electron |
|
3.59802e-04 |
2.054e-01 |
Auger electron |
|
1.15526e-03 |
1.234e-01 |
Auger electron |
|
1.65134e-03 |
2.252e+00 |
Auger electron |
|
1.77000e-03 |
4.251e-01 |
Conversion electron |
|
1.85678e-03 |
2.003e-01 |
Auger electron |
|
7.24111e-03 |
6.861e-01 |
Auger electron |
|
9.22145e-03 |
2.792e-01 |
Auger electron |
|
1.04450e-02 |
1.918e-01 |
Conversion electron |
|
1.12320e-02 |
2.780e-02 |
Auger electron |
|
1.29840e-02 |
5.465e-02 |
Conversion electron |
|
1.41764e-01 |
2.120e-02 |
Conversion electron |
|
1.42301e-01 |
4.714e-01 |
Conversion electron |
|
1.43946e-01 |
2.488e-01 |
Conversion electron |
|
1.52621e-01 |
2.507e-01 |
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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