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Radionuclide Dosimetric Data Sheets

Samarium-141

Isotope:  Sm-141
Atomic number (Z):  62
Mass number (A):  141
Neutron number (N):  79

Decay modes:  β+, Electron capture
Half-life:  10.2 [m]
Decay constant:  1.1326e-03 [1/s]
Daughters:  Pm-141 (100.0%)
Radioactive daughters:  Pm-141

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.71255 [MeV]
Mean photon energy:  1.40891 [MeV]
Air kerma rate constant, Γ₁₀:  3.096e-17 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  5.156e-17 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  1.142e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δ_α:  0.000e+00 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δ_β-,β+,e-:  1.142e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  2.257e-13 [Gy·kg/Bq·s]

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-141 DPK.csv

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-141 Summary Spectrum.csv

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-141 Beta Spectrum.csv

 

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-141 Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
1.48434e-05	4.947e+00	X-ray
5.41729e-03	2.671e-02	X-ray
5.95960e-03	1.665e-02	X-ray
3.81996e-02	1.094e-01	X-ray
3.87671e-02	1.985e-01	X-ray
4.37575e-02	1.976e-02	X-ray
4.38721e-02	3.824e-02	X-ray
3.24400e-01	2.508e-02	Gamma
4.03900e-01	4.250e-01	Gamma
4.38200e-01	3.765e-01	Gamma
5.11000e-01	1.064e+00	Annihilation photon
7.28400e-01	1.275e-02	Gamma
7.67500e-01	1.148e-02	Gamma
8.54300e-01	1.317e-02	Gamma
1.04640e+00	1.487e-02	Gamma
1.05710e+00	3.272e-02	Gamma
1.09190e+00	2.593e-02	Gamma
1.29260e+00	6.757e-02	Gamma
1.46390e+00	1.912e-02	Gamma
1.49570e+00	1.785e-02	Gamma
1.60070e+00	4.038e-02	Gamma
2.03780e+00	2.805e-02	Gamma
9.27473e-01	3.093e-02	Positron
1.01969e+00	3.623e-02	Positron
1.27798e+00	1.521e-02	Positron
1.41193e+00	2.012e-01	Positron
1.42781e+00	2.112e-01	Positron
1.43706e-05	4.323e-01	Auger electron
8.53088e-05	4.030e-01	Auger electron
1.00560e-04	1.979e+00	Auger electron
1.59771e-04	3.189e-01	Auger electron
4.75380e-04	6.301e-02	Auger electron
7.56010e-04	6.887e-01	Auger electron
9.22829e-04	4.573e-02	Auger electron
4.30042e-03	2.590e-01	Auger electron
5.30033e-03	8.783e-02	Auger electron
3.14373e-02	1.991e-02	Auger electron

 

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

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

 

 

 

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