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Radionuclide Dosimetric Data Sheets
Iridium-195
Summary data
General
Classification
Isotope: Ir-195
Atomic number (Z): 77
Mass number (A): 195
Neutron number (N): 118
Radioactive decay
Decay modes: β-
Half-life: 2.5 [h]
Decay constant: 7.7016e-05 [1/s]
Daughters: Pt-195 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.38034 [MeV]
Mean photon energy: 0.05932 [MeV]
Air kerma rate constant, Γ10: 9.450e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 9.450e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.094e-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-:
6.094e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 9.504e-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-195 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-195 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-195 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-195 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.01423e-05 |
1.860e+01 |
X-ray |
|
2.06878e-03 |
5.237e-02 |
X-ray |
|
9.35458e-03 |
1.654e-02 |
X-ray |
|
9.43804e-03 |
1.458e-01 |
X-ray |
|
1.08400e-02 |
1.225e-02 |
X-ray |
|
1.11006e-02 |
7.388e-02 |
X-ray |
|
1.12251e-02 |
1.438e-02 |
X-ray |
|
1.12510e-02 |
2.696e-02 |
X-ray |
|
1.29799e-02 |
1.442e-02 |
X-ray |
|
3.08500e-02 |
1.326e-02 |
Gamma |
|
6.53020e-02 |
1.654e-01 |
X-ray |
|
6.70480e-02 |
2.826e-01 |
X-ray |
|
7.55931e-02 |
3.095e-02 |
X-ray |
|
7.59780e-02 |
5.986e-02 |
X-ray |
|
7.81028e-02 |
1.407e-02 |
X-ray |
|
9.88500e-02 |
9.729e-02 |
Gamma |
|
1.29700e-01 |
1.246e-02 |
Gamma |
|
2.11300e-01 |
2.396e-02 |
Gamma |
|
2.90998e-01 |
4.000e-02 |
Beta |
|
3.22058e-01 |
5.700e-01 |
Beta |
|
3.33926e-01 |
2.600e-01 |
Beta |
|
3.72379e-01 |
1.300e-01 |
Beta |
|
3.74751e-05 |
3.973e+00 |
Auger electron |
|
5.61969e-05 |
6.387e+00 |
Auger electron |
|
1.71278e-04 |
3.354e+00 |
Auger electron |
|
4.08559e-04 |
6.282e-01 |
Auger electron |
|
6.05469e-04 |
3.935e-01 |
Auger electron |
|
1.69485e-03 |
1.648e+00 |
Auger electron |
|
1.90486e-03 |
1.565e-01 |
Auger electron |
|
7.28191e-03 |
4.622e-01 |
Auger electron |
|
9.33792e-03 |
1.908e-01 |
Auger electron |
|
1.14278e-02 |
1.923e-02 |
Auger electron |
|
1.69880e-02 |
3.605e-01 |
Conversion electron |
|
1.75370e-02 |
3.765e-02 |
Conversion electron |
|
2.02350e-02 |
5.712e-01 |
Conversion electron |
|
2.82131e-02 |
9.407e-02 |
Conversion electron |
|
3.08500e-02 |
2.897e-02 |
Conversion electron |
|
5.27836e-02 |
1.545e-02 |
Auger electron |
|
8.49880e-02 |
8.593e-02 |
Conversion electron |
|
8.55370e-02 |
1.098e-02 |
Conversion electron |
|
9.62131e-02 |
2.338e-02 |
Conversion electron |
|
1.32685e-01 |
1.493e-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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