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Radionuclide Dosimetric Data Sheets
Promethium-148m
Summary data
General
Classification
Isotope: Pm-148m
Atomic number (Z): 61
Mass number (A): 148
Neutron number (N): 87
Radioactive decay
Decay modes: β-, Internal transition
Half-life: 41.29 [d]
Decay constant: 1.9430e-07 [1/s]
Daughters: Sm-148 (95.8%), Pm-148 (4.2%)
Radioactive daughters: Sm-148, Pm-148
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.16994 [MeV]
Mean photon energy: 1.99156 [MeV]
Air kerma rate constant, Γ10: 7.439e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.439e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.723e-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-:
2.723e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.191e-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-148m 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-148m 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-148m 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-148m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.45261e-05 |
8.037e-01 |
X-ray |
|
1.48591e-05 |
7.071e-01 |
X-ray |
|
3.87671e-02 |
1.340e-02 |
X-ray |
|
3.95578e-02 |
1.837e-02 |
X-ray |
|
4.01680e-02 |
3.325e-02 |
X-ray |
|
9.84800e-02 |
2.474e-02 |
Gamma |
|
1.89630e-01 |
1.104e-02 |
Gamma |
|
2.88110e-01 |
1.256e-01 |
Gamma |
|
3.11630e-01 |
3.916e-02 |
Gamma |
|
4.14070e-01 |
1.866e-01 |
Gamma |
|
4.32780e-01 |
5.349e-02 |
Gamma |
|
5.01260e-01 |
6.746e-02 |
Gamma |
|
5.50270e-01 |
9.487e-01 |
Gamma |
|
5.99740e-01 |
1.254e-01 |
Gamma |
|
6.11260e-01 |
5.482e-02 |
Gamma |
|
6.29970e-01 |
8.900e-01 |
Gamma |
|
7.25700e-01 |
3.284e-01 |
Gamma |
|
9.15330e-01 |
1.717e-01 |
Gamma |
|
1.01381e+00 |
2.028e-01 |
Gamma |
|
1.21495e-01 |
5.494e-01 |
Beta |
|
1.55202e-01 |
1.773e-01 |
Beta |
|
2.23856e-01 |
2.226e-01 |
Beta |
|
1.43706e-05 |
6.150e-02 |
Auger electron |
|
1.51033e-05 |
6.285e-02 |
Auger electron |
|
8.47839e-05 |
5.842e-02 |
Auger electron |
|
9.41319e-05 |
5.145e-02 |
Auger electron |
|
1.00657e-04 |
2.817e-01 |
Auger electron |
|
1.06730e-04 |
3.358e-01 |
Auger electron |
|
1.61975e-04 |
4.502e-02 |
Auger electron |
|
1.69023e-04 |
5.336e-02 |
Auger electron |
|
5.05036e-04 |
1.017e-02 |
Auger electron |
|
7.55774e-04 |
9.971e-02 |
Auger electron |
|
8.03602e-04 |
1.156e-01 |
Auger electron |
|
4.30246e-03 |
3.644e-02 |
Auger electron |
|
4.45571e-03 |
4.309e-02 |
Auger electron |
|
5.30064e-03 |
1.236e-02 |
Auger electron |
|
5.50536e-03 |
1.473e-02 |
Auger electron |
|
3.05810e-02 |
2.775e-02 |
Conversion electron |
|
5.16040e-02 |
3.777e-02 |
Conversion electron |
|
5.42808e-02 |
1.478e-02 |
Conversion electron |
|
5.48481e-02 |
1.576e-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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