<= Return to MIRDspec isotope database
Radionuclide Dosimetric Data Sheets
Germanium-69
Summary data
General
Classification
Isotope: Ge-69
Atomic number (Z): 32
Mass number (A): 69
Neutron number (N): 37
Radioactive decay
Decay modes: β+, Electron capture
Half-life: 39.05 [h]
Decay constant: 4.9306e-06 [1/s]
Daughters: Ga-69 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.1203 [MeV]
Mean photon energy: 0.95049 [MeV]
Air kerma rate constant, Γ10: 2.709e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.621e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.927e-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-:
1.927e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.523e-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/Ge-69 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/Ge-69 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/Ge-69 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/Ge-69 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.57868e-05 |
4.751e+00 |
X-ray |
|
9.18060e-03 |
1.011e-01 |
X-ray |
|
9.20900e-03 |
1.966e-01 |
X-ray |
|
1.02200e-02 |
1.278e-02 |
X-ray |
|
1.02237e-02 |
2.497e-02 |
X-ray |
|
3.18630e-01 |
1.548e-02 |
Gamma |
|
5.11000e-01 |
4.709e-01 |
Annihilation photon |
|
5.74110e-01 |
1.332e-01 |
Gamma |
|
8.71980e-01 |
1.188e-01 |
Gamma |
|
1.10677e+00 |
3.600e-01 |
Gamma |
|
1.33660e+00 |
4.500e-02 |
Gamma |
|
2.71521e-01 |
2.298e-02 |
Positron |
|
5.22189e-01 |
2.098e-01 |
Positron |
|
1.17412e-05 |
1.306e+00 |
Auger electron |
|
5.44248e-05 |
1.198e+00 |
Auger electron |
|
9.44559e-05 |
1.809e-01 |
Auger electron |
|
1.00292e-03 |
9.469e-01 |
Auger electron |
|
1.05287e-03 |
1.469e-02 |
Auger electron |
|
7.99646e-03 |
2.645e-01 |
Auger electron |
|
9.04875e-03 |
6.985e-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)
<= Return to MIRDspec isotope database
