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Radionuclide Dosimetric Data Sheets
Antimony-126m
Summary data
General
Classification
Isotope: Sb-126m
Atomic number (Z): 51
Mass number (A): 126
Neutron number (N): 75
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 19.15 [m]
Decay constant: 6.0326e-04 [1/s]
Daughters: Sb-126 (14.0%), Te-126 (86.0%)
Radioactive daughters: Sb-126
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.63215 [MeV]
Mean photon energy: 1.5483 [MeV]
Air kerma rate constant, Γ10: 5.802e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.802e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.013e-13 [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-:
1.013e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.481e-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/Sb-126m 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/Sb-126m 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/Sb-126m 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/Sb-126m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.22315e-05 |
1.576e+00 |
X-ray |
|
1.36106e-05 |
2.342e-01 |
X-ray |
|
4.14500e-01 |
8.567e-01 |
Gamma |
|
6.20000e-01 |
1.542e-02 |
Gamma |
|
6.66100e-01 |
8.567e-01 |
Gamma |
|
6.94800e-01 |
8.225e-01 |
Gamma |
|
9.28200e-01 |
1.285e-02 |
Gamma |
|
1.03490e+00 |
1.799e-02 |
Gamma |
|
3.40932e-01 |
1.262e-02 |
Beta |
|
4.69795e-01 |
3.302e-02 |
Beta |
|
7.42719e-01 |
8.060e-01 |
Beta |
|
1.68817e-05 |
7.762e-01 |
Auger electron |
|
2.29205e-05 |
1.144e-01 |
Auger electron |
|
2.49367e-05 |
3.810e-02 |
Auger electron |
|
2.75138e-05 |
2.572e-01 |
Auger electron |
|
1.21260e-04 |
1.310e-02 |
Auger electron |
|
1.24650e-04 |
8.633e-02 |
Auger electron |
|
4.21430e-04 |
2.028e-01 |
Auger electron |
|
4.49288e-04 |
2.959e-02 |
Auger electron |
|
2.94540e-03 |
7.717e-02 |
Auger electron |
|
3.08216e-03 |
1.163e-02 |
Auger electron |
|
3.49608e-03 |
2.081e-02 |
Auger electron |
|
1.33140e-02 |
4.278e-02 |
Conversion electron |
|
1.35695e-02 |
6.485e-02 |
Conversion electron |
|
1.69383e-02 |
2.646e-02 |
Conversion electron |
|
3.82695e-01 |
1.022e-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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