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Radionuclide Dosimetric Data Sheets
Neodymium-139m
Summary data
General
Classification
Isotope: Nd-139m
Atomic number (Z): 60
Mass number (A): 139
Neutron number (N): 79
Radioactive decay
Decay modes: β+, Electron capture, Internal
transition
Half-life: 5.5 [h]
Decay constant: 3.5007e-05 [1/s]
Daughters: Pr-139 (88.2%), Nd-139 (11.8%)
Radioactive daughters: Pr-139, Nd-139
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.0795 [MeV]
Mean photon energy: 1.58523 [MeV]
Air kerma rate constant, Γ10: 5.887e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 5.941e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.274e-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-:
1.274e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.540e-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/Nd-139m 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-139m 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-139m 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-139m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.51905e-05 |
1.154e+00 |
X-ray |
|
1.56197e-05 |
1.423e+01 |
X-ray |
|
8.16946e-04 |
1.084e-02 |
X-ray |
|
5.01953e-03 |
6.331e-02 |
X-ray |
|
5.48692e-03 |
3.872e-02 |
X-ray |
|
5.83581e-03 |
1.036e-02 |
X-ray |
|
3.55671e-02 |
2.841e-01 |
X-ray |
|
3.60557e-02 |
5.188e-01 |
X-ray |
|
3.68696e-02 |
1.869e-02 |
X-ray |
|
3.73962e-02 |
3.404e-02 |
X-ray |
|
4.06843e-02 |
5.084e-02 |
X-ray |
|
4.07816e-02 |
9.844e-02 |
X-ray |
|
4.17693e-02 |
1.087e-02 |
X-ray |
|
4.17904e-02 |
2.114e-02 |
X-ray |
|
9.29100e-02 |
1.023e-02 |
Gamma |
|
1.13870e-01 |
3.987e-01 |
Gamma |
|
2.09650e-01 |
1.799e-02 |
Gamma |
|
2.54600e-01 |
1.200e-02 |
Gamma |
|
3.62420e-01 |
2.328e-02 |
Gamma |
|
4.03750e-01 |
2.399e-02 |
Gamma |
|
5.11000e-01 |
2.789e-02 |
Annihilation photon |
|
5.47650e-01 |
2.364e-02 |
Gamma |
|
7.01200e-01 |
4.163e-02 |
Gamma |
|
7.08100e-01 |
2.639e-01 |
Gamma |
|
7.38200e-01 |
3.528e-01 |
Gamma |
|
7.96500e-01 |
4.198e-02 |
Gamma |
|
8.02000e-01 |
6.985e-02 |
Gamma |
|
8.09600e-01 |
6.350e-02 |
Gamma |
|
8.22100e-01 |
1.729e-02 |
Gamma |
|
8.27800e-01 |
1.034e-01 |
Gamma |
|
9.10100e-01 |
7.620e-02 |
Gamma |
|
9.82200e-01 |
2.639e-01 |
Gamma |
|
1.00620e+00 |
3.210e-02 |
Gamma |
|
1.01230e+00 |
2.752e-02 |
Gamma |
|
1.02490e+00 |
1.517e-02 |
Gamma |
|
1.07520e+00 |
3.493e-02 |
Gamma |
|
1.10530e+00 |
2.717e-02 |
Gamma |
|
1.21960e+00 |
1.658e-02 |
Gamma |
|
1.22670e+00 |
1.341e-02 |
Gamma |
|
1.32230e+00 |
1.870e-02 |
Gamma |
|
2.06090e+00 |
4.798e-02 |
Gamma |
|
1.29601e-05 |
1.663e+00 |
Auger electron |
|
1.36628e-05 |
1.158e-01 |
Auger electron |
|
3.35201e-05 |
1.350e-02 |
Auger electron |
|
7.04634e-05 |
1.777e+00 |
Auger electron |
|
7.83128e-05 |
1.170e-01 |
Auger electron |
|
8.71964e-05 |
4.999e+00 |
Auger electron |
|
9.39393e-05 |
4.387e-01 |
Auger electron |
|
1.42897e-04 |
7.906e-01 |
Auger electron |
|
1.50770e-04 |
6.826e-02 |
Auger electron |
|
4.15468e-04 |
1.675e-01 |
Auger electron |
|
4.53432e-04 |
1.519e-02 |
Auger electron |
|
6.67631e-04 |
1.840e+00 |
Auger electron |
|
7.11163e-04 |
1.537e-01 |
Auger electron |
|
8.25811e-04 |
1.301e-01 |
Auger electron |
|
8.74710e-04 |
1.058e-02 |
Auger electron |
|
3.99723e-03 |
7.045e-01 |
Auger electron |
|
4.14827e-03 |
5.800e-02 |
Auger electron |
|
4.90056e-03 |
2.346e-01 |
Auger electron |
|
5.09992e-03 |
1.950e-02 |
Auger electron |
|
5.83721e-03 |
1.923e-02 |
Auger electron |
|
2.93378e-02 |
5.789e-02 |
Auger electron |
|
3.45832e-02 |
2.753e-02 |
Auger electron |
|
5.09000e-02 |
1.914e-02 |
Conversion electron |
|
7.18600e-02 |
3.113e-01 |
Conversion electron |
|
1.07070e-01 |
3.918e-02 |
Conversion electron |
|
1.87553e-01 |
7.077e-02 |
Conversion electron |
|
2.24057e-01 |
1.614e-02 |
Conversion electron |
|
2.24949e-01 |
1.057e-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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