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Radionuclide Dosimetric Data Sheets
Neodymium-139
Summary data
General
Classification
Isotope: Nd-139
Atomic number (Z): 60
Mass number (A): 139
Neutron number (N): 79
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 29.7 [m]
Decay constant: 3.8897e-04 [1/s]
Daughters: Pr-139 (100.0%)
Radioactive daughters: Pr-139
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.20841 [MeV]
Mean photon energy: 0.44311 [MeV]
Air kerma rate constant, Γ10: 8.208e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 1.798e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.339e-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-:
3.339e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 7.099e-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/Nd-139 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/Nd-139 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/Nd-139 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/Nd-139 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.56192e-05 |
8.412e+00 |
X-ray |
|
5.01953e-03 |
3.746e-02 |
X-ray |
|
5.48692e-03 |
2.278e-02 |
X-ray |
|
3.55671e-02 |
1.690e-01 |
X-ray |
|
3.60557e-02 |
3.086e-01 |
X-ray |
|
4.06843e-02 |
3.024e-02 |
X-ray |
|
4.07816e-02 |
5.855e-02 |
X-ray |
|
4.17904e-02 |
1.257e-02 |
X-ray |
|
4.05000e-01 |
6.916e-02 |
Gamma |
|
4.75500e-01 |
1.311e-02 |
Gamma |
|
5.11000e-01 |
5.046e-01 |
Annihilation photon |
|
6.21700e-01 |
1.216e-02 |
Gamma |
|
6.69000e-01 |
1.520e-02 |
Gamma |
|
9.16900e-01 |
1.520e-02 |
Gamma |
|
9.23400e-01 |
1.330e-02 |
Gamma |
|
1.07420e+00 |
2.527e-02 |
Gamma |
|
8.05479e-01 |
2.439e-01 |
Positron |
|
1.29601e-05 |
9.832e-01 |
Auger electron |
|
7.04712e-05 |
1.051e+00 |
Auger electron |
|
8.71941e-05 |
2.956e+00 |
Auger electron |
|
1.42856e-04 |
4.678e-01 |
Auger electron |
|
4.15931e-04 |
9.931e-02 |
Auger electron |
|
6.67646e-04 |
1.087e+00 |
Auger electron |
|
8.25859e-04 |
7.694e-02 |
Auger electron |
|
3.99709e-03 |
4.164e-01 |
Auger electron |
|
4.90044e-03 |
1.387e-01 |
Auger electron |
|
5.83713e-03 |
1.136e-02 |
Auger electron |
|
2.93378e-02 |
3.443e-02 |
Auger electron |
|
3.45832e-02 |
1.638e-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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