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Radionuclide Dosimetric Data Sheets
Iridium-190m
Summary data
General
Classification
Isotope: Ir-190m
Atomic number (Z): 77
Mass number (A): 190
Neutron number (N): 113
Radioactive decay
Decay modes: Internal transition
Half-life: 1.12 [h]
Decay constant: 1.7191e-04 [1/s]
Daughters: Ir-190 (100.0%)
Radioactive daughters: Ir-190
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.02397 [MeV]
Mean photon energy: 0.00237 [MeV]
Air kerma rate constant, Γ10: 2.155e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.155e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.840e-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-:
3.840e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.797e-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-190m 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-190m 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-190m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.53758e-05 |
7.030e+00 |
X-ray |
|
1.98762e-03 |
3.322e-02 |
X-ray |
|
9.09081e-03 |
1.598e-02 |
X-ray |
|
9.16921e-03 |
1.409e-01 |
X-ray |
|
1.09194e-02 |
2.578e-02 |
X-ray |
|
3.54700e-05 |
1.341e+00 |
Auger electron |
|
1.69806e-04 |
2.315e+00 |
Auger electron |
|
3.28056e-04 |
4.693e-01 |
Auger electron |
|
3.50648e-04 |
9.808e-02 |
Auger electron |
|
5.10632e-04 |
7.237e-02 |
Auger electron |
|
1.63560e-03 |
1.136e+00 |
Auger electron |
|
1.83421e-03 |
1.005e-01 |
Auger electron |
|
6.70067e-03 |
3.422e-01 |
Auger electron |
|
8.64556e-03 |
1.375e-01 |
Auger electron |
|
1.06077e-02 |
1.353e-02 |
Auger electron |
|
1.29040e-02 |
9.136e-02 |
Conversion electron |
|
1.50860e-02 |
6.067e-01 |
Conversion electron |
|
2.37610e-02 |
2.282e-01 |
Conversion electron |
|
2.63000e-02 |
6.906e-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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