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Radionuclide Dosimetric Data Sheets
Iridium-184
Summary data
General
Classification
Isotope: Ir-184
Atomic number (Z): 77
Mass number (A): 184
Neutron number (N): 107
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 3.09 [h]
Decay constant: 6.2311e-05 [1/s]
Daughters: Os-184 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.3194 [MeV]
Mean photon energy: 1.96436 [MeV]
Air kerma rate constant, Γ10: 7.317e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.991e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 5.117e-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-:
5.117e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.147e-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-184 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-184 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-184 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-184 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
4.40849e-05 |
1.284e+01 |
X-ray |
|
1.92141e-03 |
5.587e-02 |
X-ray |
|
7.84700e-03 |
1.131e-02 |
X-ray |
|
8.83249e-03 |
1.945e-02 |
X-ray |
|
8.90608e-03 |
1.715e-01 |
X-ray |
|
1.03795e-02 |
1.347e-01 |
X-ray |
|
1.05947e-02 |
3.106e-02 |
X-ray |
|
1.21269e-02 |
2.568e-02 |
X-ray |
|
6.16420e-02 |
2.732e-01 |
X-ray |
|
6.31890e-02 |
4.706e-01 |
X-ray |
|
7.12758e-02 |
5.110e-02 |
X-ray |
|
7.16144e-02 |
9.876e-02 |
X-ray |
|
7.35200e-02 |
1.177e-02 |
X-ray |
|
7.35997e-02 |
2.288e-02 |
X-ray |
|
1.19790e-01 |
3.053e-01 |
Gamma |
|
2.12020e-01 |
1.870e-02 |
Gamma |
|
2.63980e-01 |
6.800e-01 |
Gamma |
|
3.64720e-01 |
1.129e-02 |
Gamma |
|
3.90360e-01 |
2.591e-01 |
Gamma |
|
4.93110e-01 |
5.848e-02 |
Gamma |
|
5.02950e-01 |
2.958e-02 |
Gamma |
|
5.11000e-01 |
3.485e-01 |
Annihilation photon |
|
5.39690e-01 |
6.800e-02 |
Gamma |
|
6.01160e-01 |
3.250e-02 |
Gamma |
|
6.13820e-01 |
1.333e-02 |
Gamma |
|
6.26590e-01 |
2.455e-02 |
Gamma |
|
6.97260e-01 |
1.686e-02 |
Gamma |
|
7.67490e-01 |
1.156e-02 |
Gamma |
|
7.78250e-01 |
1.081e-02 |
Gamma |
|
8.22970e-01 |
3.808e-02 |
Gamma |
|
8.26050e-01 |
1.285e-02 |
Gamma |
|
8.39100e-01 |
1.448e-02 |
Gamma |
|
8.41330e-01 |
7.956e-02 |
Gamma |
|
9.42870e-01 |
3.672e-02 |
Gamma |
|
9.44140e-01 |
2.734e-02 |
Gamma |
|
9.61260e-01 |
1.244e-01 |
Gamma |
|
1.04455e+00 |
5.372e-02 |
Gamma |
|
1.06220e+00 |
2.448e-02 |
Gamma |
|
1.06621e+00 |
1.530e-02 |
Gamma |
|
1.10528e+00 |
5.304e-02 |
Gamma |
|
1.22940e+00 |
1.217e-02 |
Gamma |
|
1.23693e+00 |
2.101e-02 |
Gamma |
|
1.24781e+00 |
2.666e-02 |
Gamma |
|
1.33430e+00 |
2.332e-02 |
Gamma |
|
1.45789e+00 |
1.380e-02 |
Gamma |
|
1.67240e+00 |
3.740e-02 |
Gamma |
|
2.06300e+00 |
4.556e-02 |
Gamma |
|
8.61575e-01 |
1.042e-02 |
Positron |
|
1.08146e+00 |
1.251e-02 |
Positron |
|
1.28431e+00 |
4.274e-02 |
Positron |
|
1.46126e+00 |
6.046e-02 |
Positron |
|
2.95925e-05 |
2.497e+00 |
Auger electron |
|
1.63722e-04 |
4.273e+00 |
Auger electron |
|
3.34268e-04 |
8.507e-01 |
Auger electron |
|
3.42719e-04 |
1.713e-01 |
Auger electron |
|
7.00899e-04 |
2.013e-01 |
Auger electron |
|
1.58329e-03 |
2.041e+00 |
Auger electron |
|
1.78098e-03 |
1.600e-01 |
Auger electron |
|
6.91293e-03 |
6.359e-01 |
Auger electron |
|
8.81259e-03 |
2.527e-01 |
Auger electron |
|
1.07410e-02 |
2.477e-02 |
Auger electron |
|
2.33340e-02 |
1.143e-02 |
Conversion electron |
|
4.06040e-02 |
2.100e-02 |
Conversion electron |
|
4.57240e-02 |
1.771e-01 |
Conversion electron |
|
4.99348e-02 |
2.698e-02 |
Auger electron |
|
5.97656e-02 |
1.430e-02 |
Auger electron |
|
1.06840e-01 |
2.020e-02 |
Conversion electron |
|
1.07366e-01 |
1.884e-01 |
Conversion electron |
|
1.08913e-01 |
1.546e-01 |
Conversion electron |
|
1.17338e-01 |
9.306e-02 |
Conversion electron |
|
1.19790e-01 |
2.659e-02 |
Conversion electron |
|
1.89914e-01 |
5.590e-02 |
Conversion electron |
|
2.51556e-01 |
1.302e-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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