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Radionuclide Dosimetric Data Sheets
Iridium-180
Summary data
General
Classification
Isotope: Ir-180
Atomic number (Z): 77
Mass number (A): 180
Neutron number (N): 103
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 1.5 [m]
Decay constant: 7.7016e-03 [1/s]
Daughters: Os-180 (100.0%)
Radioactive daughters: Os-180
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.24394 [MeV]
Mean photon energy: 1.59548 [MeV]
Air kerma rate constant, Γ10: 4.352e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.614e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.993e-13 [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-:
1.993e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.556e-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-180 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-180 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-180 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-180 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.40882e-05 |
8.056e+00 |
X-ray |
|
1.92176e-03 |
3.502e-02 |
X-ray |
|
8.83249e-03 |
1.203e-02 |
X-ray |
|
8.90608e-03 |
1.061e-01 |
X-ray |
|
1.03795e-02 |
8.823e-02 |
X-ray |
|
1.05947e-02 |
1.921e-02 |
X-ray |
|
1.21269e-02 |
1.682e-02 |
X-ray |
|
6.16420e-02 |
1.598e-01 |
X-ray |
|
6.31890e-02 |
2.753e-01 |
X-ray |
|
7.12758e-02 |
2.988e-02 |
X-ray |
|
7.16144e-02 |
5.776e-02 |
X-ray |
|
7.35997e-02 |
1.338e-02 |
X-ray |
|
1.32100e-01 |
3.621e-01 |
Gamma |
|
2.76500e-01 |
5.100e-01 |
Gamma |
|
3.52300e-01 |
1.632e-02 |
Gamma |
|
3.86400e-01 |
6.120e-02 |
Gamma |
|
4.92200e-01 |
3.315e-02 |
Gamma |
|
5.05000e-01 |
1.734e-02 |
Gamma |
|
5.11000e-01 |
1.169e+00 |
Annihilation photon |
|
5.44300e-01 |
1.377e-02 |
Gamma |
|
6.04100e-01 |
1.020e-02 |
Gamma |
|
6.14100e-01 |
1.989e-02 |
Gamma |
|
6.44200e-01 |
9.078e-02 |
Gamma |
|
6.44200e-01 |
5.355e-02 |
Gamma |
|
6.44800e-01 |
5.100e-02 |
Gamma |
|
6.84900e-01 |
3.876e-02 |
Gamma |
|
6.98900e-01 |
1.127e-01 |
Gamma |
|
7.38200e-01 |
2.295e-02 |
Gamma |
|
7.88300e-01 |
8.466e-02 |
Gamma |
|
8.09000e-01 |
1.632e-02 |
Gamma |
|
8.70500e-01 |
8.976e-02 |
Gamma |
|
8.90700e-01 |
1.158e-01 |
Gamma |
|
9.20900e-01 |
1.530e-02 |
Gamma |
|
9.97000e-01 |
2.754e-02 |
Gamma |
|
1.06470e+00 |
3.825e-02 |
Gamma |
|
1.10640e+00 |
2.346e-02 |
Gamma |
|
1.69841e+00 |
1.105e-02 |
Positron |
|
1.73900e+00 |
4.622e-02 |
Positron |
|
1.73928e+00 |
5.989e-02 |
Positron |
|
1.78942e+00 |
2.010e-02 |
Positron |
|
1.80342e+00 |
3.215e-02 |
Positron |
|
1.88555e+00 |
6.943e-02 |
Positron |
|
1.95204e+00 |
7.174e-02 |
Positron |
|
1.96590e+00 |
5.024e-02 |
Positron |
|
2.00435e+00 |
4.220e-02 |
Positron |
|
2.25068e+00 |
1.578e-01 |
Positron |
|
2.95869e-05 |
1.566e+00 |
Auger electron |
|
1.63771e-04 |
2.682e+00 |
Auger electron |
|
3.34839e-04 |
5.346e-01 |
Auger electron |
|
3.42740e-04 |
1.075e-01 |
Auger electron |
|
7.27606e-04 |
1.193e-01 |
Auger electron |
|
1.58387e-03 |
1.279e+00 |
Auger electron |
|
1.78196e-03 |
1.004e-01 |
Auger electron |
|
6.92544e-03 |
3.993e-01 |
Auger electron |
|
8.82565e-03 |
1.588e-01 |
Auger electron |
|
1.07546e-02 |
1.556e-02 |
Auger electron |
|
4.99348e-02 |
1.578e-02 |
Auger electron |
|
5.80340e-02 |
1.707e-01 |
Conversion electron |
|
1.19150e-01 |
1.932e-02 |
Conversion electron |
|
1.19676e-01 |
1.435e-01 |
Conversion electron |
|
1.21223e-01 |
1.137e-01 |
Conversion electron |
|
1.29648e-01 |
7.074e-02 |
Conversion electron |
|
1.32100e-01 |
2.024e-02 |
Conversion electron |
|
2.02434e-01 |
3.721e-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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