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Radionuclide Dosimetric Data Sheets
Tin-109
Summary data
General
Classification
Isotope: Sn-109
Atomic number (Z): 50
Mass number (A): 109
Neutron number (N): 59
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 18.0 [m]
Decay constant: 6.4180e-04 [1/s]
Daughters: In-109 (71.7%), In-109m (28.3%)
Radioactive daughters: In-109, In-109m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.0571 [MeV]
Mean photon energy: 2.2063 [MeV]
Air kerma rate constant, Γ10: 7.543e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.845e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.148e-15 [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-:
9.148e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.535e-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/Sn-109 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-109 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-109 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-109 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
8.12529e-06 |
1.311e+01 |
X-ray |
|
3.27540e-03 |
2.651e-02 |
X-ray |
|
3.48147e-03 |
1.501e-02 |
X-ray |
|
2.39785e-02 |
1.960e-01 |
X-ray |
|
2.41926e-02 |
3.677e-01 |
X-ray |
|
2.72214e-02 |
3.281e-02 |
X-ray |
|
2.72603e-02 |
6.370e-02 |
X-ray |
|
2.78371e-02 |
1.304e-02 |
X-ray |
|
3.31200e-01 |
9.692e-02 |
Gamma |
|
3.53900e-01 |
1.023e-02 |
Gamma |
|
3.84500e-01 |
3.311e-02 |
Gamma |
|
4.37200e-01 |
2.589e-02 |
Gamma |
|
4.37400e-01 |
2.589e-02 |
Gamma |
|
5.11000e-01 |
1.558e-01 |
Annihilation photon |
|
5.21900e-01 |
2.890e-02 |
Gamma |
|
6.14100e-01 |
1.806e-02 |
Gamma |
|
6.23400e-01 |
2.167e-02 |
Gamma |
|
6.60100e-01 |
1.445e-02 |
Gamma |
|
7.90900e-01 |
1.565e-02 |
Gamma |
|
9.76300e-01 |
1.084e-02 |
Gamma |
|
1.02640e+00 |
5.298e-02 |
Gamma |
|
1.02640e+00 |
5.298e-02 |
Gamma |
|
1.03900e+00 |
4.515e-02 |
Gamma |
|
1.09920e+00 |
3.010e-01 |
Gamma |
|
1.11920e+00 |
3.161e-02 |
Gamma |
|
1.12820e+00 |
1.415e-02 |
Gamma |
|
1.32130e+00 |
1.186e-01 |
Gamma |
|
1.46200e+00 |
2.107e-02 |
Gamma |
|
1.46360e+00 |
3.010e-02 |
Gamma |
|
1.46420e+00 |
3.612e-02 |
Gamma |
|
1.48870e+00 |
4.063e-02 |
Gamma |
|
1.49240e+00 |
1.354e-02 |
Gamma |
|
1.57440e+00 |
5.478e-02 |
Gamma |
|
1.58070e+00 |
1.144e-02 |
Gamma |
|
1.72220e+00 |
1.053e-02 |
Gamma |
|
1.75950e+00 |
1.114e-02 |
Gamma |
|
1.88980e+00 |
1.535e-02 |
Gamma |
|
1.91110e+00 |
5.809e-02 |
Gamma |
|
1.94350e+00 |
1.686e-02 |
Gamma |
|
2.05520e+00 |
1.776e-02 |
Gamma |
|
2.12590e+00 |
1.385e-02 |
Gamma |
|
2.19560e+00 |
1.385e-02 |
Gamma |
|
2.54180e+00 |
2.619e-02 |
Gamma |
|
2.78540e+00 |
1.746e-02 |
Gamma |
|
2.85860e+00 |
1.023e-02 |
Gamma |
|
7.72438e-01 |
1.962e-02 |
Positron |
|
8.85907e-06 |
6.501e+00 |
Auger electron |
|
3.35255e-05 |
2.285e+00 |
Auger electron |
|
1.25699e-04 |
7.119e-01 |
Auger electron |
|
2.62869e-04 |
1.252e-01 |
Auger electron |
|
3.70857e-04 |
1.609e+00 |
Auger electron |
|
4.36990e-04 |
2.645e-02 |
Auger electron |
|
2.73432e-03 |
6.374e-01 |
Auger electron |
|
3.21463e-03 |
1.558e-01 |
Auger electron |
|
2.00957e-02 |
8.009e-02 |
Auger electron |
|
2.34091e-02 |
3.353e-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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