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Radionuclide Dosimetric Data Sheets
Promethium-141
Summary data
General
Classification
Isotope: Pm-141
Atomic number (Z): 61
Mass number (A): 141
Neutron number (N): 80
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 20.9 [m]
Decay constant: 5.5275e-04 [1/s]
Daughters: Nd-141 (99.8%), Nd-141m (0.167%)
Radioactive daughters: Nd-141, Nd-141m
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.60535 [MeV]
Mean photon energy: 0.7349 [MeV]
Air kerma rate constant, Γ10: 8.311e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.777e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 9.699e-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-:
9.699e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.177e-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/Pm-141 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/Pm-141 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/Pm-141 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/Pm-141 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.51979e-05 |
5.314e+00 |
X-ray |
|
5.21638e-03 |
2.606e-02 |
X-ray |
|
5.72010e-03 |
1.604e-02 |
X-ray |
|
3.68696e-02 |
1.120e-01 |
X-ray |
|
3.73962e-02 |
2.040e-01 |
X-ray |
|
4.22041e-02 |
2.015e-02 |
X-ray |
|
4.23100e-02 |
3.900e-02 |
X-ray |
|
1.93670e-01 |
1.607e-02 |
Gamma |
|
5.11000e-01 |
1.005e+00 |
Annihilation photon |
|
8.86220e-01 |
2.436e-02 |
Gamma |
|
1.22326e+00 |
4.740e-02 |
Gamma |
|
1.34552e+00 |
1.327e-02 |
Gamma |
|
1.20267e+00 |
4.968e-01 |
Positron |
|
1.36628e-05 |
5.318e-01 |
Auger electron |
|
7.81721e-05 |
5.407e-01 |
Auger electron |
|
9.39722e-05 |
2.015e+00 |
Auger electron |
|
1.51232e-04 |
3.101e-01 |
Auger electron |
|
4.44931e-04 |
6.515e-02 |
Auger electron |
|
7.10793e-04 |
7.127e-01 |
Auger electron |
|
8.73709e-04 |
4.897e-02 |
Auger electron |
|
4.14711e-03 |
2.705e-01 |
Auger electron |
|
5.09808e-03 |
9.094e-02 |
Auger electron |
|
3.03768e-02 |
2.156e-02 |
Auger electron |
|
3.58432e-02 |
1.034e-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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