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Radionuclide Dosimetric Data Sheets

Samarium-141m

Summary data

General

Classification

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

Radioactive decay

Decay modes:  β+, Electron capture, Internal transition
Half-life:  22.6 [m]
Decay constant:  5.1117e-04 [1/s]
Daughters:  Pm-141 (99.7%), Sm-141 (0.31%)
Radioactive daughters:  Pm-141, Sm-141

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.39951 [MeV]
Mean photon energy:  1.94938 [MeV]
Air kerma rate constant, Γ10:  5.814e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  7.080e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  6.401e-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-:  6.401e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  3.123e-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-141m 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-141m 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-141m 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-141m Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.47901e-05

4.358e-02

X-ray

1.48434e-05

9.101e+00

X-ray

5.41729e-03

4.915e-02

X-ray

5.95960e-03

3.069e-02

X-ray

3.81996e-02

2.014e-01

X-ray

3.87671e-02

3.654e-01

X-ray

4.37575e-02

3.637e-02

X-ray

4.38721e-02

7.038e-02

X-ray

4.49791e-02

1.525e-02

X-ray

1.96600e-01

7.429e-01

Gamma

4.31800e-01

4.037e-01

Gamma

5.11000e-01

6.540e-01

Annihilation photon

5.38500e-01

8.438e-02

Gamma

6.07900e-01

1.009e-02

Gamma

6.28700e-01

2.665e-02

Gamma

6.76800e-01

1.373e-02

Gamma

6.84600e-01

7.913e-02

Gamma

7.25700e-01

1.453e-02

Gamma

7.50300e-01

1.575e-02

Gamma

7.77400e-01

2.031e-01

Gamma

7.85900e-01

6.823e-02

Gamma

8.05900e-01

3.553e-02

Gamma

8.37100e-01

3.593e-02

Gamma

8.75000e-01

1.252e-02

Gamma

8.96500e-01

1.453e-02

Gamma

9.11300e-01

9.205e-02

Gamma

9.24700e-01

2.301e-02

Gamma

9.83300e-01

7.267e-02

Gamma

1.00910e+00

2.907e-02

Gamma

1.10840e+00

1.252e-02

Gamma

1.11760e+00

3.230e-02

Gamma

1.14510e+00

8.721e-02

Gamma

1.46340e+00

1.817e-02

Gamma

1.49030e+00

9.246e-02

Gamma

1.78640e+00

1.094e-01

Gamma

2.07370e+00

1.413e-02

Gamma

7.26181e-01

4.766e-02

Positron

7.38441e-01

3.527e-02

Positron

7.87080e-01

3.813e-02

Positron

1.04413e+00

2.521e-02

Positron

1.09047e+00

1.377e-02

Positron

1.15723e+00

1.726e-02

Positron

1.24590e+00

3.283e-02

Positron

1.30894e+00

2.288e-02

Positron

1.40526e+00

7.626e-02

Positron

1.43706e-05

7.953e-01

Auger electron

8.52994e-05

7.414e-01

Auger electron

1.00562e-04

3.641e+00

Auger electron

1.05031e-04

1.880e-02

Auger electron

1.59780e-04

5.864e-01

Auger electron

4.75183e-04

1.157e-01

Auger electron

7.55995e-04

1.267e+00

Auger electron

9.22786e-04

8.413e-02

Auger electron

4.30035e-03

4.767e-01

Auger electron

5.30024e-03

1.616e-01

Auger electron

6.33369e-03

1.362e-02

Auger electron

3.14373e-02

3.665e-02

Auger electron

3.71303e-02

1.772e-02

Auger electron

1.51381e-01

1.504e-01

Conversion electron

1.89206e-01

1.930e-02

Conversion electron

3.86581e-01

3.427e-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

 

 

 

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