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Radionuclide Dosimetric Data Sheets
Iridium-196m
Summary data
General
Classification
Isotope: Ir-196m
Atomic number (Z): 77
Mass number (A): 196
Neutron number (N): 119
Radioactive decay
Decay modes: β-
Half-life: 1.4 [h]
Decay constant: 1.3753e-04 [1/s]
Daughters: Pt-196 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.38444 [MeV]
Mean photon energy: 2.4677 [MeV]
Air kerma rate constant, Γ10: 9.847e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 9.847e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 6.159e-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-:
6.159e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.954e-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-196m 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-196m 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-196m 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-196m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.01477e-05 |
1.085e+01 |
X-ray |
|
2.07269e-03 |
3.047e-02 |
X-ray |
|
9.43801e-03 |
8.208e-02 |
X-ray |
|
1.11006e-02 |
8.808e-02 |
X-ray |
|
1.12510e-02 |
1.518e-02 |
X-ray |
|
1.29799e-02 |
1.719e-02 |
X-ray |
|
6.53020e-02 |
6.094e-02 |
X-ray |
|
6.70480e-02 |
1.041e-01 |
X-ray |
|
7.55931e-02 |
1.141e-02 |
X-ray |
|
7.59780e-02 |
2.206e-02 |
X-ray |
|
1.03300e-01 |
1.632e-01 |
Gamma |
|
3.40700e-01 |
1.536e-02 |
Gamma |
|
3.55900e-01 |
9.408e-01 |
Gamma |
|
3.93500e-01 |
9.696e-01 |
Gamma |
|
4.20900e-01 |
2.496e-02 |
Gamma |
|
4.47100e-01 |
9.408e-01 |
Gamma |
|
5.21400e-01 |
9.600e-01 |
Gamma |
|
6.33500e-01 |
1.104e-02 |
Gamma |
|
6.47300e-01 |
9.120e-01 |
Gamma |
|
6.93900e-01 |
4.224e-02 |
Gamma |
|
7.27300e-01 |
2.592e-02 |
Gamma |
|
8.35600e-01 |
6.336e-02 |
Gamma |
|
1.48250e+00 |
2.304e-02 |
Gamma |
|
3.01450e-02 |
9.389e-02 |
Beta |
|
7.09661e-02 |
4.645e-02 |
Beta |
|
1.58952e-01 |
5.337e-02 |
Beta |
|
3.11838e-01 |
7.907e-01 |
Beta |
|
3.74572e-05 |
2.308e+00 |
Auger electron |
|
5.60676e-05 |
3.733e+00 |
Auger electron |
|
1.71717e-04 |
1.978e+00 |
Auger electron |
|
4.12783e-04 |
3.607e-01 |
Auger electron |
|
1.01654e-03 |
6.844e-02 |
Auger electron |
|
1.70264e-03 |
9.595e-01 |
Auger electron |
|
1.91690e-03 |
9.190e-02 |
Auger electron |
|
7.38364e-03 |
2.967e-01 |
Auger electron |
|
9.43858e-03 |
1.227e-01 |
Auger electron |
|
1.15228e-02 |
1.236e-02 |
Auger electron |
|
2.46850e-02 |
1.109e-01 |
Conversion electron |
|
8.94380e-02 |
1.520e-02 |
Conversion electron |
|
8.99870e-02 |
2.362e-01 |
Conversion electron |
|
9.17330e-02 |
1.988e-01 |
Conversion electron |
|
1.00663e-01 |
1.168e-01 |
Conversion electron |
|
1.03300e-01 |
3.404e-02 |
Conversion electron |
|
2.77285e-01 |
3.804e-02 |
Conversion electron |
|
3.14885e-01 |
1.133e-02 |
Conversion electron |
|
3.68485e-01 |
2.228e-02 |
Conversion electron |
|
4.42785e-01 |
1.613e-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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