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Radionuclide Dosimetric Data Sheets
Praseodymium-137
Summary data
General
Classification
Isotope: Pr-137
Atomic number (Z): 59
Mass number (A): 137
Neutron number (N): 78
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 1.28 [h]
Decay constant: 1.5042e-04 [1/s]
Daughters: Ce-137 (100.0%)
Radioactive daughters: Ce-137
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.19469 [MeV]
Mean photon energy: 0.36931 [MeV]
Air kerma rate constant, Γ10: 5.709e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.540e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.119e-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-:
3.119e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 5.917e-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/Pr-137 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-137 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-137 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-137 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.61262e-05 |
8.835e+00 |
X-ray |
|
4.82666e-03 |
3.532e-02 |
X-ray |
|
5.25981e-03 |
2.123e-02 |
X-ray |
|
3.42907e-02 |
1.673e-01 |
X-ray |
|
3.47432e-02 |
3.064e-01 |
X-ray |
|
3.91962e-02 |
2.979e-02 |
X-ray |
|
3.92855e-02 |
5.771e-02 |
X-ray |
|
4.02466e-02 |
1.234e-02 |
X-ray |
|
4.33890e-01 |
1.285e-02 |
Gamma |
|
5.11000e-01 |
5.005e-01 |
Annihilation photon |
|
5.13980e-01 |
1.085e-02 |
Gamma |
|
8.36650e-01 |
1.782e-02 |
Gamma |
|
7.55927e-01 |
2.484e-01 |
Positron |
|
1.22653e-05 |
1.255e+00 |
Auger electron |
|
3.21300e-05 |
1.028e-02 |
Auger electron |
|
6.25480e-05 |
1.364e+00 |
Auger electron |
|
7.40104e-05 |
2.968e+00 |
Auger electron |
|
1.35100e-04 |
4.639e-01 |
Auger electron |
|
3.89375e-04 |
9.942e-02 |
Auger electron |
|
6.26826e-04 |
1.090e+00 |
Auger electron |
|
7.79454e-04 |
7.904e-02 |
Auger electron |
|
3.85099e-03 |
4.210e-01 |
Auger electron |
|
4.70760e-03 |
1.387e-01 |
Auger electron |
|
5.59667e-03 |
1.120e-02 |
Auger electron |
|
2.83188e-02 |
3.618e-02 |
Auger electron |
|
3.33488e-02 |
1.705e-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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