<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Tin-123m
Summary data
General
Classification
Isotope: Sn-123m
Atomic number (Z): 50
Mass number (A): 123
Neutron number (N): 73
Radioactive decay
Decay modes: β-
Half-life: 40.06 [m]
Decay constant: 2.8838e-04 [1/s]
Daughters: Sb-123 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.47884 [MeV]
Mean photon energy: 0.14072 [MeV]
Air kerma rate constant, Γ10: 5.259e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.259e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.672e-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-:
7.672e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.255e-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-123m 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-123m 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-123m 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-123m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.22326e-05 |
1.924e+00 |
X-ray |
|
2.60930e-02 |
3.138e-02 |
X-ray |
|
2.63486e-02 |
5.855e-02 |
X-ray |
|
2.97173e-02 |
1.036e-02 |
X-ray |
|
1.60320e-01 |
8.570e-01 |
Gamma |
|
4.58660e-01 |
9.993e-01 |
Beta |
|
1.68949e-05 |
9.471e-01 |
Auger electron |
|
2.73675e-05 |
3.191e-01 |
Auger electron |
|
1.22160e-04 |
1.067e-01 |
Auger electron |
|
2.80995e-04 |
1.897e-02 |
Auger electron |
|
4.22438e-04 |
2.404e-01 |
Auger electron |
|
2.96416e-03 |
9.471e-02 |
Auger electron |
|
3.51878e-03 |
2.563e-02 |
Auger electron |
|
2.17904e-02 |
1.094e-02 |
Auger electron |
|
1.29841e-01 |
1.253e-01 |
Conversion electron |
|
1.55646e-01 |
1.486e-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)
<= Return to MIRDspec isotope database
