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Radionuclide Dosimetric Data Sheets
Samarium-155
Summary data
General
Classification
Isotope: Sm-155
Atomic number (Z): 62
Mass number (A): 155
Neutron number (N): 93
Radioactive decay
Decay modes: β-
Half-life: 22.3 [m]
Decay constant: 5.1805e-04 [1/s]
Daughters: Eu-155 (100.0%)
Radioactive daughters: Eu-155
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.56737 [MeV]
Mean photon energy: 0.10294 [MeV]
Air kerma rate constant, Γ10: 3.542e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.542e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.090e-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-:
9.090e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.649e-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-155 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-155 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-155 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-155 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.42233e-05 |
2.230e+00 |
X-ray |
|
5.83100e-03 |
1.449e-02 |
X-ray |
|
4.09430e-02 |
5.029e-02 |
X-ray |
|
4.15992e-02 |
9.071e-02 |
X-ray |
|
4.70984e-02 |
1.771e-02 |
X-ray |
|
1.04320e-01 |
7.460e-01 |
Gamma |
|
1.41411e-01 |
1.977e-02 |
Gamma |
|
2.45730e-01 |
3.730e-02 |
Gamma |
|
4.70862e-01 |
2.153e-02 |
Beta |
|
4.96776e-01 |
4.237e-02 |
Beta |
|
5.56922e-01 |
9.207e-01 |
Beta |
|
1.58398e-05 |
1.576e-01 |
Auger electron |
|
1.04841e-04 |
1.081e-01 |
Auger electron |
|
1.13044e-04 |
9.614e-01 |
Auger electron |
|
1.79273e-04 |
1.515e-01 |
Auger electron |
|
5.37113e-04 |
2.797e-02 |
Auger electron |
|
8.53648e-04 |
3.308e-01 |
Auger electron |
|
1.02541e-03 |
2.036e-02 |
Auger electron |
|
4.61266e-03 |
1.220e-01 |
Auger electron |
|
5.71306e-03 |
4.202e-02 |
Auger electron |
|
1.29820e-02 |
1.406e-02 |
Conversion electron |
|
5.57520e-02 |
1.591e-01 |
Conversion electron |
|
9.63019e-02 |
1.647e-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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