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Radionuclide Dosimetric Data Sheets
Antimony-120
Summary data
General
Classification
Isotope: Sb-120
Atomic number (Z): 51
Mass number (A): 120
Neutron number (N): 69
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 15.89 [m]
Decay constant: 7.2703e-04 [1/s]
Daughters: Sn-120 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.30771 [MeV]
Mean photon energy: 0.45213 [MeV]
Air kerma rate constant, Γ10: 4.275e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.015e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 4.930e-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-:
4.930e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.244e-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-120 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-120 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-120 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-120 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.08543e-05 |
8.062e+00 |
X-ray |
|
3.43219e-03 |
1.786e-02 |
X-ray |
|
3.65722e-03 |
1.015e-02 |
X-ray |
|
2.50232e-02 |
1.258e-01 |
X-ray |
|
2.52572e-02 |
2.354e-01 |
X-ray |
|
2.84307e-02 |
2.123e-02 |
X-ray |
|
2.84736e-02 |
4.123e-02 |
X-ray |
|
5.11000e-01 |
8.203e-01 |
Annihilation photon |
|
1.17120e+00 |
1.690e-02 |
Gamma |
|
7.41589e-01 |
4.100e-01 |
Positron |
|
1.13311e-05 |
3.986e+00 |
Auger electron |
|
3.03624e-05 |
1.372e+00 |
Auger electron |
|
1.23880e-04 |
4.429e-01 |
Auger electron |
|
2.72359e-04 |
7.900e-02 |
Auger electron |
|
3.96295e-04 |
9.978e-01 |
Auger electron |
|
4.70176e-04 |
2.274e-02 |
Auger electron |
|
2.84846e-03 |
3.938e-01 |
Auger electron |
|
3.36533e-03 |
1.015e-01 |
Auger electron |
|
2.09334e-02 |
4.743e-02 |
Auger electron |
|
2.44171e-02 |
2.020e-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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