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Radionuclide Dosimetric Data Sheets
Iridium-195m
Summary data
General
Classification
Isotope: Ir-195m
Atomic number (Z): 77
Mass number (A): 195
Neutron number (N): 118
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 3.8 [h]
Decay constant: 5.0669e-05 [1/s]
Daughters: Pt-195m (43.7%), Ir-195 (5.0%), Pt-195 (51.3%)
Radioactive daughters: Pt-195m, Ir-195
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.26058 [MeV]
Mean photon energy: 0.37661 [MeV]
Air kerma rate constant, Γ10: 1.957e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.957e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.175e-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-:
4.175e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 6.034e-14
[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-195m 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-195m 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-195m 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-195m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.01425e-05 |
1.363e+01 |
X-ray |
|
4.53463e-05 |
3.627e-01 |
X-ray |
|
2.06888e-03 |
3.840e-02 |
X-ray |
|
9.35458e-03 |
1.221e-02 |
X-ray |
|
9.43804e-03 |
1.076e-01 |
X-ray |
|
1.11006e-02 |
5.758e-02 |
X-ray |
|
1.12510e-02 |
1.991e-02 |
X-ray |
|
1.29799e-02 |
1.123e-02 |
X-ray |
|
6.53020e-02 |
1.293e-01 |
X-ray |
|
6.70480e-02 |
2.210e-01 |
X-ray |
|
7.55931e-02 |
2.421e-02 |
X-ray |
|
7.59780e-02 |
4.681e-02 |
X-ray |
|
7.81028e-02 |
1.100e-02 |
X-ray |
|
9.88500e-02 |
5.148e-02 |
Gamma |
|
1.72780e-01 |
4.891e-02 |
Gamma |
|
2.01650e-01 |
1.411e-02 |
Gamma |
|
2.11300e-01 |
1.879e-02 |
Gamma |
|
2.39210e-01 |
1.646e-02 |
Gamma |
|
2.51610e-01 |
1.787e-02 |
Gamma |
|
2.90300e-01 |
1.881e-02 |
Gamma |
|
3.06480e-01 |
1.336e-02 |
Gamma |
|
3.19900e-01 |
9.405e-02 |
Gamma |
|
3.56380e-01 |
1.787e-02 |
Gamma |
|
3.59310e-01 |
4.514e-02 |
Gamma |
|
3.64940e-01 |
9.311e-02 |
Gamma |
|
3.73390e-01 |
1.035e-02 |
Gamma |
|
4.09040e-01 |
1.411e-02 |
Gamma |
|
4.32860e-01 |
9.405e-02 |
Gamma |
|
4.81170e-01 |
2.633e-02 |
Gamma |
|
5.75350e-01 |
1.505e-02 |
Gamma |
|
6.84880e-01 |
9.405e-02 |
Gamma |
|
8.00900e-01 |
1.035e-02 |
Gamma |
|
7.69338e-02 |
4.958e-02 |
Beta |
|
8.77917e-02 |
1.884e-02 |
Beta |
|
1.13383e-01 |
3.719e-01 |
Beta |
|
1.98807e-01 |
7.239e-02 |
Beta |
|
2.45967e-01 |
8.132e-02 |
Beta |
|
3.10704e-01 |
3.471e-01 |
Beta |
|
3.54565e-05 |
6.936e-02 |
Auger electron |
|
3.74740e-05 |
2.911e+00 |
Auger electron |
|
5.61698e-05 |
4.682e+00 |
Auger electron |
|
1.70121e-04 |
1.194e-01 |
Auger electron |
|
1.71287e-04 |
2.460e+00 |
Auger electron |
|
3.35447e-04 |
2.442e-02 |
Auger electron |
|
4.08485e-04 |
4.587e-01 |
Auger electron |
|
6.14560e-04 |
2.715e-01 |
Auger electron |
|
1.63739e-03 |
5.818e-02 |
Auger electron |
|
1.69518e-03 |
1.209e+00 |
Auger electron |
|
1.90536e-03 |
1.148e-01 |
Auger electron |
|
6.79814e-03 |
1.697e-02 |
Auger electron |
|
7.28325e-03 |
3.425e-01 |
Auger electron |
|
9.33867e-03 |
1.414e-01 |
Auger electron |
|
1.14273e-02 |
1.425e-02 |
Auger electron |
|
1.41380e-02 |
1.131e-02 |
Conversion electron |
|
1.69880e-02 |
2.136e-01 |
Conversion electron |
|
1.75370e-02 |
2.231e-02 |
Conversion electron |
|
2.02350e-02 |
3.022e-01 |
Conversion electron |
|
2.82131e-02 |
5.574e-02 |
Conversion electron |
|
3.08500e-02 |
1.717e-02 |
Conversion electron |
|
4.05050e-02 |
1.313e-02 |
Conversion electron |
|
4.05050e-02 |
1.313e-02 |
Conversion electron |
|
4.65380e-02 |
1.102e-02 |
Conversion electron |
|
5.27836e-02 |
1.208e-02 |
Auger electron |
|
6.18850e-02 |
1.580e-02 |
Conversion electron |
|
8.49880e-02 |
4.547e-02 |
Conversion electron |
|
8.87860e-02 |
2.411e-02 |
Conversion electron |
|
9.41650e-02 |
1.194e-02 |
Conversion electron |
|
9.62131e-02 |
1.237e-02 |
Conversion electron |
|
9.74610e-02 |
1.105e-02 |
Conversion electron |
|
1.23035e-01 |
1.109e-02 |
Conversion electron |
|
1.32685e-01 |
1.171e-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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