<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Promethium-140m
Summary data
General
Classification
Isotope: Pm-140m
Atomic number (Z): 61
Mass number (A): 140
Neutron number (N): 79
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 5.95 [m]
Decay constant: 1.9416e-03 [1/s]
Daughters: Nd-140 (100.0%)
Radioactive daughters: Nd-140
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.99317 [MeV]
Mean photon energy: 3.03242 [MeV]
Air kerma rate constant, Γ10: 8.585e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.117e-16 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.591e-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-:
1.591e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 4.858e-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-140m 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-140m 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-140m 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-140m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.52003e-05 |
4.179e+00 |
X-ray |
|
5.21638e-03 |
2.041e-02 |
X-ray |
|
5.72010e-03 |
1.289e-02 |
X-ray |
|
3.68696e-02 |
8.666e-02 |
X-ray |
|
3.73962e-02 |
1.578e-01 |
X-ray |
|
4.22041e-02 |
1.559e-02 |
X-ray |
|
4.23100e-02 |
3.017e-02 |
X-ray |
|
2.57900e-01 |
1.400e-02 |
Gamma |
|
4.19570e-01 |
9.200e-01 |
Gamma |
|
4.74200e-01 |
1.000e-02 |
Gamma |
|
5.11000e-01 |
1.335e+00 |
Annihilation photon |
|
7.73740e-01 |
1.000e+00 |
Gamma |
|
1.02819e+00 |
1.000e+00 |
Gamma |
|
1.19750e+00 |
3.800e-02 |
Gamma |
|
1.26190e+00 |
1.000e-02 |
Gamma |
|
9.12030e-01 |
1.319e-02 |
Positron |
|
1.46161e+00 |
6.393e-01 |
Positron |
|
1.36628e-05 |
4.182e-01 |
Auger electron |
|
7.81426e-05 |
4.258e-01 |
Auger electron |
|
9.39792e-05 |
1.584e+00 |
Auger electron |
|
1.51414e-04 |
2.437e-01 |
Auger electron |
|
4.42876e-04 |
5.059e-02 |
Auger electron |
|
7.10775e-04 |
5.610e-01 |
Auger electron |
|
8.73611e-04 |
3.854e-02 |
Auger electron |
|
4.14789e-03 |
2.129e-01 |
Auger electron |
|
5.09880e-03 |
7.156e-02 |
Auger electron |
|
3.03768e-02 |
1.668e-02 |
Auger electron |
|
3.75973e-01 |
4.043e-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)
<= Return to MIRDspec isotope database
