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Radionuclide Dosimetric Data Sheets
Samarium-142
Summary data
General
Classification
Isotope: Sm-142
Atomic number (Z): 62
Mass number (A): 142
Neutron number (N): 80
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 72.49 [m]
Decay constant: 1.5937e-04 [1/s]
Daughters: Pm-142 (100.0%)
Radioactive daughters: Pm-142
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.04458 [MeV]
Mean photon energy: 0.11051 [MeV]
Air kerma rate constant, Γ10: 2.799e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.625e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 7.143e-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-:
7.143e-15 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.771e-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-142 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-142 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-142 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-142 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.48436e-05 |
9.393e+00 |
X-ray |
|
5.41729e-03 |
5.063e-02 |
X-ray |
|
5.95960e-03 |
3.154e-02 |
X-ray |
|
3.81996e-02 |
2.074e-01 |
X-ray |
|
3.87671e-02 |
3.763e-01 |
X-ray |
|
4.37575e-02 |
3.746e-02 |
X-ray |
|
4.38721e-02 |
7.249e-02 |
X-ray |
|
4.49791e-02 |
1.570e-02 |
X-ray |
|
5.11000e-01 |
1.460e-01 |
Annihilation photon |
|
5.18703e-01 |
7.300e-02 |
Positron |
|
1.43706e-05 |
8.208e-01 |
Auger electron |
|
8.53241e-05 |
7.651e-01 |
Auger electron |
|
1.00558e-04 |
3.758e+00 |
Auger electron |
|
1.59760e-04 |
6.060e-01 |
Auger electron |
|
4.75932e-04 |
1.205e-01 |
Auger electron |
|
7.56038e-04 |
1.307e+00 |
Auger electron |
|
9.22902e-04 |
8.678e-02 |
Auger electron |
|
4.30091e-03 |
4.914e-01 |
Auger electron |
|
5.30090e-03 |
1.667e-01 |
Auger electron |
|
6.33450e-03 |
1.404e-02 |
Auger electron |
|
3.14373e-02 |
3.774e-02 |
Auger electron |
|
3.71303e-02 |
1.825e-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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