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Radionuclide Dosimetric Data Sheets
Iodine-134m
Summary data
General
Classification
Isotope: I-134m
Atomic number (Z): 53
Mass number (A): 134
Neutron number (N): 81
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 3.6 [m]
Decay constant: 3.2090e-03 [1/s]
Daughters: I-134 (97.7%), Xe-134 (2.3%)
Radioactive daughters: I-134
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.09131 [MeV]
Mean photon energy: 0.28871 [MeV]
Air kerma rate constant, Γ10: 1.465e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.465e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.463e-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-:
1.463e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.626e-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/I-134m 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-134m 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-134m 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-134m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.52660e-05 |
1.297e+01 |
X-ray |
|
1.66151e-05 |
8.146e-02 |
X-ray |
|
3.92520e-03 |
3.782e-02 |
X-ray |
|
4.21605e-03 |
2.269e-02 |
X-ray |
|
2.83065e-02 |
2.244e-01 |
X-ray |
|
2.86096e-02 |
4.166e-01 |
X-ray |
|
3.22368e-02 |
3.875e-02 |
X-ray |
|
3.22942e-02 |
7.514e-02 |
X-ray |
|
3.30298e-02 |
1.581e-02 |
X-ray |
|
4.44000e-02 |
1.084e-01 |
Gamma |
|
2.34300e-01 |
1.587e-02 |
Gamma |
|
2.72100e-01 |
7.914e-01 |
Gamma |
|
8.47000e-01 |
2.300e-02 |
Gamma |
|
8.85000e-01 |
2.300e-02 |
Gamma |
|
9.60836e-01 |
2.300e-02 |
Beta |
|
2.60857e-05 |
1.264e-02 |
Auger electron |
|
2.70101e-05 |
1.943e+00 |
Auger electron |
|
2.89496e-05 |
6.253e+00 |
Auger electron |
|
3.62292e-05 |
3.877e-02 |
Auger electron |
|
1.25162e-04 |
7.160e-01 |
Auger electron |
|
3.03375e-04 |
1.356e-01 |
Auger electron |
|
4.76912e-04 |
1.668e+00 |
Auger electron |
|
5.04858e-04 |
1.070e-02 |
Auger electron |
|
5.78292e-04 |
7.936e-02 |
Auger electron |
|
3.20510e-03 |
6.544e-01 |
Auger electron |
|
3.83969e-03 |
1.934e-01 |
Auger electron |
|
4.49772e-03 |
1.408e-02 |
Auger electron |
|
1.12360e-02 |
7.465e-01 |
Conversion electron |
|
2.35598e-02 |
6.738e-02 |
Auger electron |
|
2.75866e-02 |
3.017e-02 |
Auger electron |
|
3.92381e-02 |
9.021e-02 |
Conversion electron |
|
4.35302e-02 |
2.007e-02 |
Conversion electron |
|
2.38936e-01 |
1.288e-01 |
Conversion electron |
|
2.66938e-01 |
1.352e-02 |
Conversion electron |
|
2.67243e-01 |
1.665e-02 |
Conversion electron |
|
2.67546e-01 |
1.142e-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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