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Radionuclide Dosimetric Data Sheets
Iodine-124
Summary data
General
Classification
Isotope: I-124
Atomic number (Z): 53
Mass number (A): 124
Neutron number (N): 71
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 4.176 [d]
Decay constant: 1.9211e-06 [1/s]
Daughters: Te-124 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.19428 [MeV]
Mean photon energy: 1.11324 [MeV]
Air kerma rate constant, Γ10: 3.399e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.284e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.113e-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-:
3.113e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.784e-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-124 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-124 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-124 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-124 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.36107e-05 |
9.946e+00 |
X-ray |
|
3.75695e-03 |
2.622e-02 |
X-ray |
|
4.02446e-03 |
1.506e-02 |
X-ray |
|
2.71868e-02 |
1.668e-01 |
X-ray |
|
2.74652e-02 |
3.105e-01 |
X-ray |
|
3.09378e-02 |
2.859e-02 |
X-ray |
|
3.09901e-02 |
5.545e-02 |
X-ray |
|
3.16841e-02 |
1.164e-02 |
X-ray |
|
5.11000e-01 |
4.572e-01 |
Annihilation photon |
|
6.02720e-01 |
6.290e-01 |
Gamma |
|
7.22780e-01 |
1.035e-01 |
Gamma |
|
1.32550e+00 |
1.561e-02 |
Gamma |
|
1.37600e+00 |
1.749e-02 |
Gamma |
|
1.50949e+00 |
3.132e-02 |
Gamma |
|
1.69102e+00 |
1.088e-01 |
Gamma |
|
6.87056e-01 |
1.173e-01 |
Positron |
|
9.74767e-01 |
1.083e-01 |
Positron |
|
2.29241e-05 |
4.860e+00 |
Auger electron |
|
2.49253e-05 |
1.624e+00 |
Auger electron |
|
1.21001e-04 |
5.595e-01 |
Auger electron |
|
2.96188e-04 |
1.045e-01 |
Auger electron |
|
4.49512e-04 |
1.250e+00 |
Auger electron |
|
5.41245e-04 |
4.817e-02 |
Auger electron |
|
3.08495e-03 |
4.908e-01 |
Auger electron |
|
3.67910e-03 |
1.390e-01 |
Auger electron |
|
2.26653e-02 |
5.391e-02 |
Auger electron |
|
2.65056e-02 |
2.374e-02 |
Auger 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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