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Radionuclide Dosimetric Data Sheets
Iodine-119
Summary data
General
Classification
Isotope: I-119
Atomic number (Z): 53
Mass number (A): 119
Neutron number (N): 66
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 19.1 [m]
Decay constant: 6.0484e-04 [1/s]
Daughters: Te-119 (99.0%), Te-119m (0.954%)
Radioactive daughters: Te-119, Te-119m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.51163 [MeV]
Mean photon energy: 0.91102 [MeV]
Air kerma rate constant, Γ10: 1.585e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.624e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 8.197e-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-:
8.197e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.460e-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/I-119 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/I-119 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/I-119 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/I-119 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36107e-05 |
7.321e+00 |
X-ray |
|
3.75695e-03 |
1.937e-02 |
X-ray |
|
4.02446e-03 |
1.114e-02 |
X-ray |
|
2.71868e-02 |
1.234e-01 |
X-ray |
|
2.74652e-02 |
2.298e-01 |
X-ray |
|
3.09378e-02 |
2.116e-02 |
X-ray |
|
3.09901e-02 |
4.104e-02 |
X-ray |
|
6.30900e-02 |
1.066e-02 |
Gamma |
|
2.57520e-01 |
8.670e-01 |
Gamma |
|
3.20530e-01 |
2.167e-02 |
Gamma |
|
5.11000e-01 |
1.054e+00 |
Annihilation photon |
|
5.57240e-01 |
1.769e-02 |
Gamma |
|
6.35860e-01 |
2.688e-02 |
Gamma |
|
7.84919e-01 |
1.264e-02 |
Positron |
|
9.57009e-01 |
4.786e-01 |
Positron |
|
2.29232e-05 |
3.578e+00 |
Auger electron |
|
2.49274e-05 |
1.194e+00 |
Auger electron |
|
1.21053e-04 |
4.113e-01 |
Auger electron |
|
2.94855e-04 |
7.575e-02 |
Auger electron |
|
4.49456e-04 |
9.213e-01 |
Auger electron |
|
5.41075e-04 |
3.550e-02 |
Auger electron |
|
3.08416e-03 |
3.619e-01 |
Auger electron |
|
3.67818e-03 |
1.025e-01 |
Auger electron |
|
8.14500e-03 |
1.746e-02 |
Conversion electron |
|
2.26653e-02 |
3.990e-02 |
Auger electron |
|
2.65056e-02 |
1.757e-02 |
Auger electron |
|
3.12850e-02 |
2.429e-02 |
Conversion electron |
|
2.25715e-01 |
3.903e-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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