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Radionuclide Dosimetric Data Sheets
Gadolinium-149
Summary data
General
Classification
Isotope: Gd-149
Atomic number (Z): 64
Mass number (A): 149
Neutron number (N): 85
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 9.28 [d]
Decay constant: 8.6450e-07 [1/s]
Daughters: Eu-149 (100.0%)
Radioactive daughters: Eu-149
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.06859 [MeV]
Mean photon energy: 0.52923 [MeV]
Air kerma rate constant, Γ10: 2.088e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.088e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.099e-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-:
1.099e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 8.479e-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/Gd-149 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/Gd-149 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/Gd-149 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/Gd-149 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.42285e-05 |
1.303e+01 |
X-ray |
|
1.02954e-03 |
1.734e-02 |
X-ray |
|
5.83100e-03 |
8.284e-02 |
X-ray |
|
6.45760e-03 |
5.322e-02 |
X-ray |
|
6.82634e-03 |
1.388e-02 |
X-ray |
|
4.09430e-02 |
3.063e-01 |
X-ray |
|
4.15992e-02 |
5.524e-01 |
X-ray |
|
4.69640e-02 |
5.576e-02 |
X-ray |
|
4.70984e-02 |
1.079e-01 |
X-ray |
|
4.82780e-02 |
1.215e-02 |
X-ray |
|
4.83077e-02 |
2.357e-02 |
X-ray |
|
1.49735e-01 |
4.820e-01 |
Gamma |
|
2.60736e-01 |
1.321e-02 |
Gamma |
|
2.72321e-01 |
3.215e-02 |
Gamma |
|
2.98634e-01 |
2.863e-01 |
Gamma |
|
3.46651e-01 |
2.391e-01 |
Gamma |
|
4.96383e-01 |
1.658e-02 |
Gamma |
|
5.16545e-01 |
2.694e-02 |
Gamma |
|
5.34295e-01 |
3.070e-02 |
Gamma |
|
6.45315e-01 |
1.460e-02 |
Gamma |
|
7.48601e-01 |
8.218e-02 |
Gamma |
|
7.88876e-01 |
7.341e-02 |
Gamma |
|
9.38610e-01 |
2.391e-02 |
Gamma |
|
1.58398e-05 |
9.233e-01 |
Auger electron |
|
1.05241e-04 |
6.320e-01 |
Auger electron |
|
1.13009e-04 |
5.623e+00 |
Auger electron |
|
1.79251e-04 |
8.959e-01 |
Auger electron |
|
5.44694e-04 |
1.823e-01 |
Auger electron |
|
8.54084e-04 |
1.918e+00 |
Auger electron |
|
1.02658e-03 |
1.183e-01 |
Auger electron |
|
4.62131e-03 |
7.075e-01 |
Auger electron |
|
5.72291e-03 |
2.437e-01 |
Auger electron |
|
6.85887e-03 |
2.103e-02 |
Auger electron |
|
3.36229e-02 |
5.022e-02 |
Auger electron |
|
3.97850e-02 |
2.465e-02 |
Auger electron |
|
1.01167e-01 |
2.447e-01 |
Conversion electron |
|
1.41717e-01 |
3.188e-02 |
Conversion electron |
|
2.50066e-01 |
2.200e-02 |
Conversion electron |
|
2.98083e-01 |
4.659e-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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