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Radionuclide Dosimetric Data Sheets
Tin-125
Summary data
General
Classification
Isotope: Sn-125
Atomic number (Z): 50
Mass number (A): 125
Neutron number (N): 75
Radioactive decay
Decay modes: β-
Half-life: 9.64 [d]
Decay constant: 8.3221e-07 [1/s]
Daughters: Sb-125 (100.0%)
Radioactive daughters: Sb-125
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.80369 [MeV]
Mean photon energy: 0.33463 [MeV]
Air kerma rate constant, Γ10: 1.165e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.165e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.288e-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-:
1.288e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.361e-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/Sn-125 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/Sn-125 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/Sn-125 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/Sn-125 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.22326e-05 |
1.109e-02 |
X-ray |
|
3.32100e-01 |
1.406e-02 |
Gamma |
|
4.69850e-01 |
1.484e-02 |
Gamma |
|
8.00280e-01 |
1.067e-02 |
Gamma |
|
8.22480e-01 |
4.278e-02 |
Gamma |
|
9.15550e-01 |
4.132e-02 |
Gamma |
|
1.06710e+00 |
9.700e-02 |
Gamma |
|
1.08770e+00 |
1.193e-02 |
Gamma |
|
1.08915e+00 |
4.588e-02 |
Gamma |
|
2.00213e+00 |
1.921e-02 |
Gamma |
|
1.05822e-01 |
2.197e-02 |
Beta |
|
1.12245e-01 |
4.294e-02 |
Beta |
|
1.44259e-01 |
6.591e-02 |
Beta |
|
4.61381e-01 |
2.996e-02 |
Beta |
|
9.43742e-01 |
8.129e-01 |
Beta |
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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