<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Iridium-190
Summary data
General
Classification
Isotope: Ir-190
Atomic number (Z): 77
Mass number (A): 190
Neutron number (N): 113
Radioactive decay
Decay modes: Electron capture
Half-life: 11.78 [d]
Decay constant: 6.8103e-07 [1/s]
Daughters: Os-190 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.07456 [MeV]
Mean photon energy: 1.47679 [MeV]
Air kerma rate constant, Γ10: 6.326e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.326e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.195e-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-:
1.195e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.366e-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-190 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-190 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-190 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.40296e-05 |
1.059e+01 |
X-ray |
|
1.92067e-03 |
4.597e-02 |
X-ray |
|
8.83249e-03 |
1.618e-02 |
X-ray |
|
8.90608e-03 |
1.427e-01 |
X-ray |
|
1.03795e-02 |
9.214e-02 |
X-ray |
|
1.05947e-02 |
2.585e-02 |
X-ray |
|
1.21269e-02 |
1.756e-02 |
X-ray |
|
6.16420e-02 |
2.512e-01 |
X-ray |
|
6.31890e-02 |
4.327e-01 |
X-ray |
|
7.12758e-02 |
4.697e-02 |
X-ray |
|
7.16144e-02 |
9.079e-02 |
X-ray |
|
7.35200e-02 |
1.082e-02 |
X-ray |
|
7.35997e-02 |
2.103e-02 |
X-ray |
|
1.86680e-01 |
5.244e-01 |
Gamma |
|
1.96850e-01 |
3.420e-02 |
Gamma |
|
1.98080e-01 |
1.938e-02 |
Gamma |
|
2.07910e-01 |
1.186e-02 |
Gamma |
|
2.23810e-01 |
3.739e-02 |
Gamma |
|
2.88220e-01 |
1.642e-02 |
Gamma |
|
2.94750e-01 |
6.612e-02 |
Gamma |
|
3.61090e-01 |
1.302e-01 |
Gamma |
|
3.71240e-01 |
2.280e-01 |
Gamma |
|
3.80030e-01 |
2.029e-02 |
Gamma |
|
3.97360e-01 |
6.544e-02 |
Gamma |
|
4.07220e-01 |
4.560e-02 |
Gamma |
|
4.07220e-01 |
2.394e-01 |
Gamma |
|
4.20630e-01 |
1.642e-02 |
Gamma |
|
4.31620e-01 |
2.736e-02 |
Gamma |
|
4.47810e-01 |
2.554e-02 |
Gamma |
|
4.77800e-01 |
1.824e-02 |
Gamma |
|
5.02550e-01 |
1.254e-02 |
Gamma |
|
5.18550e-01 |
3.397e-01 |
Gamma |
|
5.57950e-01 |
3.010e-01 |
Gamma |
|
5.69300e-01 |
2.850e-01 |
Gamma |
|
6.05140e-01 |
3.990e-01 |
Gamma |
|
6.30910e-01 |
2.941e-02 |
Gamma |
|
6.56020e-01 |
1.163e-02 |
Gamma |
|
7.26220e-01 |
3.785e-02 |
Gamma |
|
7.68570e-01 |
2.212e-02 |
Gamma |
|
8.28990e-01 |
3.466e-02 |
Gamma |
|
8.39140e-01 |
1.140e-02 |
Gamma |
|
1.03605e+00 |
2.417e-02 |
Gamma |
|
2.96117e-05 |
2.065e+00 |
Auger electron |
|
1.63597e-04 |
3.514e+00 |
Auger electron |
|
3.34387e-04 |
7.049e-01 |
Auger electron |
|
3.44327e-04 |
1.418e-01 |
Auger electron |
|
5.98436e-04 |
2.316e-01 |
Auger electron |
|
1.58164e-03 |
1.680e+00 |
Auger electron |
|
1.77843e-03 |
1.314e-01 |
Auger electron |
|
6.88576e-03 |
5.101e-01 |
Auger electron |
|
8.78527e-03 |
2.026e-01 |
Auger electron |
|
1.07145e-02 |
1.986e-02 |
Auger electron |
|
4.99348e-02 |
2.480e-02 |
Auger electron |
|
5.97656e-02 |
1.314e-02 |
Auger electron |
|
1.12614e-01 |
1.065e-01 |
Conversion electron |
|
1.22784e-01 |
1.276e-02 |
Conversion electron |
|
1.73730e-01 |
1.255e-02 |
Conversion electron |
|
1.74256e-01 |
4.464e-02 |
Conversion electron |
|
1.75803e-01 |
3.074e-02 |
Conversion electron |
|
1.84228e-01 |
2.225e-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)
<= Return to MIRDspec isotope database
