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Radionuclide Dosimetric Data Sheets

Promethium-139

Isotope:  Pm-139
Atomic number (Z):  61
Mass number (A):  139
Neutron number (N):  78

Decay modes:  β+, Electron capture
Half-life:  4.15 [m]
Decay constant:  2.7837e-03 [1/s]
Daughters:  Nd-139 (100.0%)
Radioactive daughters:  Nd-139

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  1.04164 [MeV]
Mean photon energy:  0.93901 [MeV]
Air kerma rate constant, Γ₁₀:  9.177e-18 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  3.556e-17 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  1.669e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δ_α:  0.000e+00 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δ_β-,β+,e-:  1.669e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  1.504e-13 [Gy·kg/Bq·s]

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-139 DPK.csv

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-139 Summary Spectrum.csv

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-139 Beta Spectrum.csv

 

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-139 Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
1.51979e-05	3.768e+00	X-ray
5.21638e-03	1.850e-02	X-ray
5.72010e-03	1.140e-02	X-ray
3.68696e-02	7.945e-02	X-ray
3.73962e-02	1.447e-01	X-ray
4.22041e-02	1.429e-02	X-ray
4.23100e-02	2.766e-02	X-ray
9.53000e-02	1.784e-02	Gamma
3.67800e-01	3.524e-02	Gamma
4.02800e-01	1.450e-01	Gamma
4.63100e-01	4.075e-02	Gamma
5.11000e-01	1.363e+00	Annihilation photon
7.56500e-01	1.987e-02	Gamma
8.15800e-01	1.131e-02	Gamma
9.81600e-01	1.059e-02	Gamma
1.22818e+00	1.097e-02	Positron
1.36352e+00	4.488e-02	Positron
1.39144e+00	8.577e-02	Positron
1.57863e+00	5.186e-01	Positron
1.36628e-05	3.771e-01	Auger electron
7.81624e-05	3.835e-01	Auger electron
9.39742e-05	1.429e+00	Auger electron
1.51247e-04	2.197e-01	Auger electron
4.44480e-04	4.596e-02	Auger electron
7.10772e-04	5.056e-01	Auger electron
8.73652e-04	3.474e-02	Auger electron
4.14681e-03	1.919e-01	Auger electron
5.09773e-03	6.452e-02	Auger electron
3.03768e-02	1.529e-02	Auger electron
5.17030e-02	2.516e-02	Conversion electron

 

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

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

 

 

 

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