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Radionuclide Dosimetric Data Sheets
Gadolinium-145m
Summary data
General
Classification
Isotope: Gd-145m
Atomic number (Z): 64
Mass number (A): 145
Neutron number (N): 81
Radioactive decay
Decay modes: β+, Electron capture, Internal
transition
Half-life: 85.0 [s]
Decay constant: 8.1547e-03 [1/s]
Daughters: Gd-145 (94.3%), Eu-145 (5.7%)
Radioactive daughters: Gd-145, Eu-145
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.1927 [MeV]
Mean photon energy: 0.68138 [MeV]
Air kerma rate constant, Γ10: 2.408e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 2.578e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 3.087e-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-:
3.087e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.092e-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/Gd-145m 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-145m 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-145m 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-145m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.42271e-05 |
2.146e-01 |
X-ray |
|
1.94681e-05 |
9.486e+00 |
X-ray |
|
1.10136e-03 |
1.327e-02 |
X-ray |
|
6.04290e-03 |
4.402e-02 |
X-ray |
|
6.66291e-03 |
1.129e-02 |
X-ray |
|
6.71540e-03 |
3.684e-02 |
X-ray |
|
6.80799e-03 |
1.611e-02 |
X-ray |
|
2.73000e-02 |
4.420e-02 |
Gamma |
|
4.23559e-02 |
2.574e-02 |
X-ray |
|
4.30603e-02 |
4.628e-02 |
X-ray |
|
3.29500e-01 |
4.287e-02 |
Gamma |
|
3.86600e-01 |
3.933e-02 |
Gamma |
|
5.11000e-01 |
8.800e-02 |
Annihilation photon |
|
7.16000e-01 |
1.101e-02 |
Gamma |
|
7.21400e-01 |
8.208e-01 |
Gamma |
|
1.86168e+00 |
4.400e-02 |
Positron |
|
1.58398e-05 |
1.519e-02 |
Auger electron |
|
1.68638e-05 |
6.606e-01 |
Auger electron |
|
1.05126e-04 |
1.040e-02 |
Auger electron |
|
1.13019e-04 |
9.256e-02 |
Auger electron |
|
1.13111e-04 |
4.283e+00 |
Auger electron |
|
1.28518e-04 |
3.584e-01 |
Auger electron |
|
1.79241e-04 |
1.470e-02 |
Auger electron |
|
1.84308e-04 |
7.437e-01 |
Auger electron |
|
6.03789e-04 |
3.034e-01 |
Auger electron |
|
8.53948e-04 |
3.165e-02 |
Auger electron |
|
9.03524e-04 |
1.309e+00 |
Auger electron |
|
1.08915e-03 |
9.031e-02 |
Auger electron |
|
4.61867e-03 |
1.168e-02 |
Auger electron |
|
4.91945e-03 |
4.760e-01 |
Auger electron |
|
6.09143e-03 |
1.683e-01 |
Auger electron |
|
7.30652e-03 |
1.482e-02 |
Auger electron |
|
1.89502e-02 |
4.530e-01 |
Conversion electron |
|
1.93530e-02 |
1.256e-01 |
Conversion electron |
|
2.00573e-02 |
1.205e-01 |
Conversion electron |
|
2.57582e-02 |
1.560e-01 |
Conversion electron |
|
2.73000e-02 |
4.314e-02 |
Conversion electron |
|
6.71097e-01 |
9.598e-02 |
Conversion electron |
|
7.13050e-01 |
1.547e-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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