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Radionuclide Dosimetric Data Sheets
Iridium-190n
Summary data
General
Classification
Isotope: Ir-190n
Atomic number (Z): 77
Mass number (A): 190
Neutron number (N): 113
Radioactive decay
Decay modes: Electron capture, Internal transition
Half-life: 3.087 [h]
Decay constant: 6.2372e-05 [1/s]
Daughters: Os-190m (91.4%), Ir-190 (8.6%)
Radioactive daughters: Os-190m, Ir-190
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.02892 [MeV]
Mean photon energy: 0.05774 [MeV]
Air kerma rate constant, Γ10: 9.046e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 9.046e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.634e-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-:
4.634e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 9.251e-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-190n 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-190n 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-190n Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.40571e-05 |
7.283e+00 |
X-ray |
|
4.53437e-05 |
1.864e+00 |
X-ray |
|
1.92005e-03 |
3.175e-02 |
X-ray |
|
8.83249e-03 |
1.155e-02 |
X-ray |
|
8.90608e-03 |
1.018e-01 |
X-ray |
|
9.16922e-03 |
2.588e-02 |
X-ray |
|
1.03795e-02 |
6.145e-02 |
X-ray |
|
1.05947e-02 |
1.845e-02 |
X-ray |
|
1.07358e-02 |
1.198e-02 |
X-ray |
|
1.21269e-02 |
1.171e-02 |
X-ray |
|
3.61840e-02 |
2.559e-02 |
Gamma |
|
5.61280e-02 |
1.024e-02 |
Gamma |
|
6.16420e-02 |
2.006e-01 |
X-ray |
|
6.31890e-02 |
3.455e-01 |
X-ray |
|
6.50999e-02 |
1.487e-02 |
X-ray |
|
7.12758e-02 |
3.751e-02 |
X-ray |
|
7.16144e-02 |
7.251e-02 |
X-ray |
|
7.35997e-02 |
1.679e-02 |
X-ray |
|
1.35348e-01 |
2.812e-02 |
Gamma |
|
2.05206e-01 |
1.263e-02 |
Gamma |
|
2.96165e-05 |
1.418e+00 |
Auger electron |
|
3.54195e-05 |
3.574e-01 |
Auger electron |
|
1.63528e-04 |
2.418e+00 |
Auger electron |
|
1.70909e-04 |
6.122e-01 |
Auger electron |
|
3.32539e-04 |
4.801e-01 |
Auger electron |
|
3.43236e-04 |
9.700e-02 |
Auger electron |
|
3.52138e-04 |
1.266e-01 |
Auger electron |
|
3.62798e-04 |
2.740e-02 |
Auger electron |
|
5.69758e-04 |
6.037e-02 |
Auger electron |
|
6.01984e-04 |
1.509e-01 |
Auger electron |
|
1.58085e-03 |
1.161e+00 |
Auger electron |
|
1.64158e-03 |
2.956e-01 |
Auger electron |
|
1.77695e-03 |
9.072e-02 |
Auger electron |
|
1.84177e-03 |
2.604e-02 |
Auger electron |
|
6.86491e-03 |
3.562e-01 |
Auger electron |
|
7.05097e-03 |
8.375e-02 |
Auger electron |
|
8.76276e-03 |
1.414e-01 |
Auger electron |
|
9.02661e-03 |
3.394e-02 |
Auger electron |
|
1.06897e-02 |
1.385e-02 |
Auger electron |
|
4.27320e-02 |
4.342e-02 |
Conversion electron |
|
4.99348e-02 |
1.981e-02 |
Auger electron |
|
5.35890e-02 |
1.109e-02 |
Conversion electron |
|
5.90340e-02 |
1.228e-02 |
Conversion electron |
|
5.97656e-02 |
1.050e-02 |
Auger electron |
|
7.23860e-02 |
1.816e-02 |
Conversion electron |
|
1.22489e-01 |
1.092e-02 |
Conversion electron |
|
1.35304e-01 |
1.558e-02 |
Conversion electron |
|
1.37486e-01 |
2.899e-02 |
Conversion electron |
|
1.46161e-01 |
1.478e-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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