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Radionuclide Dosimetric Data Sheets
Antimony-128m
Summary data
General
Classification
Isotope: Sb-128m
Atomic number (Z): 51
Mass number (A): 128
Neutron number (N): 77
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 10.4 [m]
Decay constant: 1.1108e-03 [1/s]
Daughters: Sb-128 (3.6%), Te-128 (96.4%)
Radioactive daughters: Sb-128
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.95798 [MeV]
Mean photon energy: 1.90628 [MeV]
Air kerma rate constant, Γ10: 7.058e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.058e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.535e-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-:
1.535e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.054e-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-128m 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-128m 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-128m 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-128m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.22317e-05 |
4.001e-01 |
X-ray |
|
1.36106e-05 |
4.678e-01 |
X-ray |
|
2.74652e-02 |
1.443e-02 |
X-ray |
|
3.14000e-01 |
8.869e-01 |
Gamma |
|
5.94100e-01 |
3.278e-02 |
Gamma |
|
7.43240e-01 |
9.640e-01 |
Gamma |
|
7.53900e-01 |
9.640e-01 |
Gamma |
|
7.87600e-01 |
7.134e-02 |
Gamma |
|
8.44000e-01 |
2.217e-02 |
Gamma |
|
9.08300e-01 |
2.314e-02 |
Gamma |
|
1.15800e+00 |
1.735e-02 |
Gamma |
|
5.76797e-01 |
1.539e-02 |
Beta |
|
6.63755e-01 |
3.945e-02 |
Beta |
|
6.88921e-01 |
8.562e-02 |
Beta |
|
7.75834e-01 |
4.522e-02 |
Beta |
|
1.04743e+00 |
7.783e-01 |
Beta |
|
1.68798e-05 |
1.971e-01 |
Auger electron |
|
2.29201e-05 |
2.286e-01 |
Auger electron |
|
2.49400e-05 |
7.608e-02 |
Auger electron |
|
2.75070e-05 |
6.534e-02 |
Auger electron |
|
1.21329e-04 |
2.615e-02 |
Auger electron |
|
1.24532e-04 |
2.195e-02 |
Auger electron |
|
4.21422e-04 |
5.149e-02 |
Auger electron |
|
4.49255e-04 |
5.917e-02 |
Auger electron |
|
2.94276e-03 |
1.927e-02 |
Auger electron |
|
3.08181e-03 |
2.325e-02 |
Auger electron |
|
5.61400e-03 |
1.027e-02 |
Conversion electron |
|
5.86950e-03 |
1.658e-02 |
Conversion electron |
|
2.82195e-01 |
2.466e-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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