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Radionuclide Dosimetric Data Sheets
Samarium-140
Summary data
General
Classification
Isotope: Sm-140
Atomic number (Z): 62
Mass number (A): 140
Neutron number (N): 78
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 14.82 [m]
Decay constant: 7.7952e-04 [1/s]
Daughters: Pm-140 (100.0%)
Radioactive daughters: Pm-140
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.17098 [MeV]
Mean photon energy: 0.56773 [MeV]
Air kerma rate constant, Γ10: 1.418e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.178e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.739e-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-:
2.739e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 9.096e-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/Sm-140 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-140 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-140 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-140 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.48480e-05 |
9.786e+00 |
X-ray |
|
5.41729e-03 |
5.125e-02 |
X-ray |
|
5.95960e-03 |
3.233e-02 |
X-ray |
|
3.81996e-02 |
2.039e-01 |
X-ray |
|
3.87671e-02 |
3.700e-01 |
X-ray |
|
4.37575e-02 |
3.683e-02 |
X-ray |
|
4.38721e-02 |
7.127e-02 |
X-ray |
|
4.49791e-02 |
1.544e-02 |
X-ray |
|
8.44000e-02 |
1.300e-02 |
Gamma |
|
1.20800e-01 |
1.700e-02 |
Gamma |
|
1.40000e-01 |
5.000e-02 |
Gamma |
|
2.25400e-01 |
1.000e-01 |
Gamma |
|
3.39800e-01 |
1.800e-02 |
Gamma |
|
3.41300e-01 |
2.100e-02 |
Gamma |
|
5.11000e-01 |
3.923e-01 |
Annihilation photon |
|
1.13810e+00 |
1.800e-02 |
Gamma |
|
1.27420e+00 |
1.600e-02 |
Gamma |
|
1.39350e+00 |
1.200e-02 |
Gamma |
|
1.53020e+00 |
1.300e-02 |
Gamma |
|
7.79039e-01 |
1.937e-01 |
Positron |
|
1.43706e-05 |
8.569e-01 |
Auger electron |
|
8.55120e-05 |
7.974e-01 |
Auger electron |
|
1.00530e-04 |
3.916e+00 |
Auger electron |
|
1.59789e-04 |
6.372e-01 |
Auger electron |
|
4.82492e-04 |
1.396e-01 |
Auger electron |
|
7.56429e-04 |
1.351e+00 |
Auger electron |
|
9.23877e-04 |
8.983e-02 |
Auger electron |
|
4.31088e-03 |
5.079e-01 |
Auger electron |
|
5.31208e-03 |
1.724e-01 |
Auger electron |
|
6.34765e-03 |
1.454e-02 |
Auger electron |
|
2.78059e-02 |
3.619e-02 |
Conversion electron |
|
3.00810e-02 |
1.191e-02 |
Conversion electron |
|
3.14373e-02 |
3.711e-02 |
Auger electron |
|
3.71303e-02 |
1.795e-02 |
Auger electron |
|
3.91810e-02 |
2.860e-02 |
Conversion electron |
|
1.80181e-01 |
1.395e-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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