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Radionuclide Dosimetric Data Sheets
Samarium-143m
Summary data
General
Classification
Isotope: Sm-143m
Atomic number (Z): 62
Mass number (A): 143
Neutron number (N): 81
Radioactive decay
Decay modes: β+, Electron capture, Internal
transition
Half-life: 66.0 [s]
Decay constant: 1.0502e-02 [1/s]
Daughters: Sm-143 (99.8%), Pm-143 (0.24%)
Radioactive daughters: Sm-143, Pm-143
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.072 [MeV]
Mean photon energy: 0.68442 [MeV]
Air kerma rate constant, Γ10: 2.547e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.551e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.154e-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-:
1.154e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.097e-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/Sm-143m 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/Sm-143m 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/Sm-143m 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/Sm-143m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.45288e-05 |
9.552e-01 |
X-ray |
|
1.48434e-05 |
1.673e-02 |
X-ray |
|
3.95578e-02 |
2.088e-02 |
X-ray |
|
4.01680e-02 |
3.779e-02 |
X-ray |
|
7.54400e-01 |
8.988e-01 |
Gamma |
|
1.51033e-05 |
7.482e-02 |
Auger electron |
|
9.42969e-05 |
6.116e-02 |
Auger electron |
|
1.06710e-04 |
3.992e-01 |
Auger electron |
|
1.69051e-04 |
6.388e-02 |
Auger electron |
|
5.09566e-04 |
1.290e-02 |
Auger electron |
|
8.03879e-04 |
1.367e-01 |
Auger electron |
|
4.46149e-03 |
5.091e-02 |
Auger electron |
|
5.51187e-03 |
1.741e-02 |
Auger electron |
|
7.07524e-01 |
7.842e-02 |
Conversion electron |
|
7.46698e-01 |
1.212e-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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