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Radionuclide Dosimetric Data Sheets
Promethium-146
Summary data
General
Classification
Isotope: Pm-146
Atomic number (Z): 61
Mass number (A): 146
Neutron number (N): 85
Radioactive decay
Decay modes: β-, Electron capture
Half-life: 5.53 [y]
Decay constant: 3.9720e-09 [1/s]
Daughters: Sm-146 (34.0%), Nd-146 (66.0%)
Radioactive daughters: Sm-146
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.0941 [MeV]
Mean photon energy: 0.75123 [MeV]
Air kerma rate constant, Γ10: 2.930e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.930e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.508e-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-:
1.508e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.204e-13
[Gy·kg/Bq·s]
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-146 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-146 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-146 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.45256e-05 |
1.629e-02 |
X-ray |
|
1.51996e-05 |
7.117e+00 |
X-ray |
|
5.21638e-03 |
3.448e-02 |
X-ray |
|
5.72010e-03 |
2.129e-02 |
X-ray |
|
3.68696e-02 |
1.466e-01 |
X-ray |
|
3.73962e-02 |
2.670e-01 |
X-ray |
|
4.22041e-02 |
2.637e-02 |
X-ray |
|
4.23100e-02 |
5.103e-02 |
X-ray |
|
4.33673e-02 |
1.101e-02 |
X-ray |
|
4.53880e-01 |
6.501e-01 |
Gamma |
|
6.33250e-01 |
2.153e-02 |
Gamma |
|
7.35930e-01 |
2.249e-01 |
Gamma |
|
7.47240e-01 |
3.399e-01 |
Gamma |
|
4.33969e-02 |
2.141e-02 |
Beta |
|
2.59739e-01 |
3.186e-01 |
Beta |
|
1.36628e-05 |
7.127e-01 |
Auger electron |
|
7.82390e-05 |
7.242e-01 |
Auger electron |
|
9.39591e-05 |
2.700e+00 |
Auger electron |
|
1.51212e-04 |
4.177e-01 |
Auger electron |
|
4.48060e-04 |
9.130e-02 |
Auger electron |
|
7.10979e-04 |
9.513e-01 |
Auger electron |
|
8.74171e-04 |
6.540e-02 |
Auger electron |
|
4.15094e-03 |
3.608e-01 |
Auger electron |
|
5.10239e-03 |
1.213e-01 |
Auger electron |
|
6.08782e-03 |
1.009e-02 |
Auger electron |
|
3.03768e-02 |
2.821e-02 |
Auger electron |
|
3.58432e-02 |
1.353e-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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