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Radionuclide Dosimetric Data Sheets
Antimony-124m
Summary data
General
Classification
Isotope: Sb-124m
Atomic number (Z): 51
Mass number (A): 124
Neutron number (N): 73
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 93.0 [s]
Decay constant: 7.4532e-03 [1/s]
Daughters: Sb-124 (75.0%), Te-124 (25.0%)
Radioactive daughters: Sb-124
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.11566 [MeV]
Mean photon energy: 0.44013 [MeV]
Air kerma rate constant, Γ10: 1.659e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.659e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.853e-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-:
1.853e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.052e-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/Sb-124m 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-124m 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-124m 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-124m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.22365e-05 |
9.616e+00 |
X-ray |
|
1.36106e-05 |
5.495e-02 |
X-ray |
|
3.59265e-03 |
1.891e-02 |
X-ray |
|
4.98400e-01 |
2.450e-01 |
Gamma |
|
6.02720e-01 |
2.500e-01 |
Gamma |
|
6.45820e-01 |
2.500e-01 |
Gamma |
|
4.16118e-01 |
2.333e-01 |
Beta |
|
6.31829e-01 |
1.190e-02 |
Beta |
|
1.69293e-05 |
4.728e+00 |
Auger electron |
|
2.29207e-05 |
2.685e-02 |
Auger electron |
|
2.70703e-05 |
1.680e+00 |
Auger electron |
|
1.17241e-04 |
5.891e-01 |
Auger electron |
|
3.36214e-04 |
1.984e-01 |
Auger electron |
|
4.26371e-04 |
1.091e+00 |
Auger electron |
|
5.17625e-04 |
3.398e-02 |
Auger electron |
|
3.01352e-03 |
4.207e-01 |
Auger electron |
|
3.57780e-03 |
1.149e-01 |
Auger electron |
|
6.18630e-03 |
3.529e-01 |
Conversion electron |
|
6.47400e-03 |
1.915e-02 |
Conversion electron |
|
6.72950e-03 |
2.175e-01 |
Conversion electron |
|
1.00983e-02 |
1.308e-01 |
Conversion electron |
|
1.08600e-02 |
2.960e-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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