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Radionuclide Dosimetric Data Sheets
Praseodymium-138m
Summary data
General
Classification
Isotope: Pr-138m
Atomic number (Z): 59
Mass number (A): 138
Neutron number (N): 79
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 2.12 [h]
Decay constant: 9.0821e-05 [1/s]
Daughters: Ce-138 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.22079 [MeV]
Mean photon energy: 2.47756 [MeV]
Air kerma rate constant, Γ10: 8.289e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 9.186e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.537e-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-:
3.537e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 3.969e-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/Pr-138m 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/Pr-138m 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/Pr-138m 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/Pr-138m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.61292e-05 |
1.078e+01 |
X-ray |
|
4.82666e-03 |
4.283e-02 |
X-ray |
|
5.25981e-03 |
2.668e-02 |
X-ray |
|
3.42907e-02 |
1.981e-01 |
X-ray |
|
3.47432e-02 |
3.628e-01 |
X-ray |
|
3.91962e-02 |
3.527e-02 |
X-ray |
|
3.92855e-02 |
6.833e-02 |
X-ray |
|
4.02466e-02 |
1.461e-02 |
X-ray |
|
3.02700e-01 |
8.000e-01 |
Gamma |
|
3.90900e-01 |
6.100e-02 |
Gamma |
|
5.11000e-01 |
4.632e-01 |
Annihilation photon |
|
5.47500e-01 |
5.230e-02 |
Gamma |
|
6.35700e-01 |
1.780e-02 |
Gamma |
|
7.88700e-01 |
1.000e+00 |
Gamma |
|
1.03780e+00 |
1.010e+00 |
Gamma |
|
7.35193e-01 |
2.271e-01 |
Positron |
|
1.22653e-05 |
1.531e+00 |
Auger electron |
|
3.21300e-05 |
1.254e-02 |
Auger electron |
|
6.25319e-05 |
1.666e+00 |
Auger electron |
|
7.39968e-05 |
3.618e+00 |
Auger electron |
|
1.35337e-04 |
5.651e-01 |
Auger electron |
|
3.86351e-04 |
1.191e-01 |
Auger electron |
|
6.26796e-04 |
1.331e+00 |
Auger electron |
|
7.79315e-04 |
9.648e-02 |
Auger electron |
|
3.85183e-03 |
5.137e-01 |
Auger electron |
|
4.70833e-03 |
1.692e-01 |
Auger electron |
|
5.59716e-03 |
1.366e-02 |
Auger electron |
|
2.83189e-02 |
4.284e-02 |
Auger electron |
|
3.33488e-02 |
2.019e-02 |
Auger electron |
|
2.62244e-01 |
9.896e-02 |
Conversion electron |
|
2.96187e-01 |
1.104e-02 |
Conversion electron |
|
2.96535e-01 |
1.676e-02 |
Conversion electron |
|
2.96987e-01 |
1.001e-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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