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Radionuclide Dosimetric Data Sheets
Promethium-137m
Summary data
General
Classification
Isotope: Pm-137m
Atomic number (Z): 61
Mass number (A): 137
Neutron number (N): 76
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 2.4 [m]
Decay constant: 4.8135e-03 [1/s]
Daughters: Nd-137 (100.0%)
Radioactive daughters: Nd-137
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 1.11202 [MeV]
Mean photon energy: 1.78348 [MeV]
Air kerma rate constant, Γ10: 4.178e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 6.713e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.782e-13 [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-:
1.782e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.857e-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-137m 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-137m 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-137m 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-137m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.52029e-05 |
1.128e+01 |
X-ray |
|
8.63687e-04 |
1.001e-02 |
X-ray |
|
5.21638e-03 |
5.491e-02 |
X-ray |
|
5.72010e-03 |
3.577e-02 |
X-ray |
|
3.68696e-02 |
2.266e-01 |
X-ray |
|
3.73962e-02 |
4.127e-01 |
X-ray |
|
4.22041e-02 |
4.077e-02 |
X-ray |
|
4.23100e-02 |
7.889e-02 |
X-ray |
|
4.33673e-02 |
1.701e-02 |
X-ray |
|
8.70000e-02 |
5.740e-02 |
Gamma |
|
1.08600e-01 |
3.500e-01 |
Gamma |
|
1.60500e-01 |
1.645e-02 |
Gamma |
|
1.77500e-01 |
4.028e-01 |
Gamma |
|
2.33600e-01 |
2.958e-01 |
Gamma |
|
2.68700e-01 |
8.470e-02 |
Gamma |
|
2.86000e-01 |
1.606e-01 |
Gamma |
|
3.25100e-01 |
2.905e-02 |
Gamma |
|
3.28500e-01 |
3.290e-02 |
Gamma |
|
3.52300e-01 |
1.295e-02 |
Gamma |
|
3.70600e-01 |
2.905e-02 |
Gamma |
|
3.89200e-01 |
2.940e-02 |
Gamma |
|
3.97700e-01 |
1.190e-02 |
Gamma |
|
4.10600e-01 |
7.000e-02 |
Gamma |
|
4.14000e-01 |
2.170e-02 |
Gamma |
|
4.57300e-01 |
4.235e-02 |
Gamma |
|
4.59200e-01 |
1.890e-02 |
Gamma |
|
4.70700e-01 |
3.640e-02 |
Gamma |
|
5.06000e-01 |
7.000e-02 |
Gamma |
|
5.11000e-01 |
1.310e+00 |
Annihilation photon |
|
5.25100e-01 |
1.400e-02 |
Gamma |
|
5.29200e-01 |
2.485e-02 |
Gamma |
|
5.33800e-01 |
5.180e-02 |
Gamma |
|
5.33800e-01 |
5.180e-02 |
Gamma |
|
5.48800e-01 |
3.955e-02 |
Gamma |
|
5.65600e-01 |
2.590e-02 |
Gamma |
|
5.65600e-01 |
2.590e-02 |
Gamma |
|
5.81000e-01 |
1.330e-01 |
Gamma |
|
6.90800e-01 |
2.905e-02 |
Gamma |
|
7.59500e-01 |
1.085e-02 |
Gamma |
|
9.23000e-01 |
2.380e-02 |
Gamma |
|
1.09220e+00 |
4.445e-02 |
Gamma |
|
1.18990e+00 |
1.155e-02 |
Gamma |
|
1.28470e+00 |
6.755e-02 |
Gamma |
|
1.29350e+00 |
1.050e-02 |
Gamma |
|
8.24899e-01 |
1.961e-02 |
Positron |
|
1.02135e+00 |
2.941e-02 |
Positron |
|
1.23687e+00 |
7.941e-02 |
Positron |
|
1.28800e+00 |
1.961e-02 |
Positron |
|
1.32557e+00 |
3.922e-02 |
Positron |
|
1.41650e+00 |
5.882e-02 |
Positron |
|
1.60750e+00 |
6.863e-02 |
Positron |
|
1.66505e+00 |
7.549e-02 |
Positron |
|
1.87951e+00 |
2.353e-01 |
Positron |
|
1.36628e-05 |
1.128e+00 |
Auger electron |
|
7.80873e-05 |
1.151e+00 |
Auger electron |
|
9.39918e-05 |
4.272e+00 |
Auger electron |
|
1.51659e-04 |
6.558e-01 |
Auger electron |
|
4.39448e-04 |
1.330e-01 |
Auger electron |
|
7.10712e-04 |
1.516e+00 |
Auger electron |
|
8.73382e-04 |
1.041e-01 |
Auger electron |
|
4.14816e-03 |
5.750e-01 |
Auger electron |
|
5.09888e-03 |
1.933e-01 |
Auger electron |
|
6.08299e-03 |
1.606e-02 |
Auger electron |
|
3.03768e-02 |
4.361e-02 |
Auger electron |
|
3.58432e-02 |
2.092e-02 |
Auger electron |
|
6.50030e-02 |
3.405e-01 |
Conversion electron |
|
1.01507e-01 |
4.366e-02 |
Conversion electron |
|
1.07313e-01 |
1.013e-02 |
Conversion electron |
|
1.33903e-01 |
9.899e-02 |
Conversion electron |
|
1.70407e-01 |
1.262e-02 |
Conversion electron |
|
1.90003e-01 |
9.347e-02 |
Conversion electron |
|
2.26507e-01 |
1.003e-02 |
Conversion electron |
|
2.26873e-01 |
2.934e-02 |
Conversion electron |
|
2.27399e-01 |
1.935e-02 |
Conversion electron |
|
2.32313e-01 |
1.362e-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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