<= Return to MIRDspec isotope database

Radionuclide Dosimetric Data Sheets

Germanium-77

Isotope:  Ge-77
Atomic number (Z):  32
Mass number (A):  77
Neutron number (N):  45

Decay modes:  β-
Half-life:  11.3 [h]
Decay constant:  1.7039e-05 [1/s]
Daughters:  As-77 (100.0%)
Radioactive daughters:  As-77

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.64934 [MeV]
Mean photon energy:  1.07865 [MeV]
Air kerma rate constant, Γ₁₀:  3.939e-17 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  3.939e-17 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  1.040e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δ_α:  0.000e+00 [Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δ_β-,β+,e-:  1.040e-13 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  1.728e-13 [Gy·kg/Bq·s]

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-77 DPK.csv

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-77 Summary Spectrum.csv

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-77 Beta Spectrum.csv

 

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-77 Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
1.42082e-05	2.704e-01	X-ray
1.94760e-01	1.773e-02	Gamma
2.11030e-01	3.083e-01	Gamma
2.15500e-01	2.862e-01	Gamma
2.64440e-01	5.390e-01	Gamma
3.67400e-01	1.401e-01	Gamma
4.16330e-01	2.183e-01	Gamma
4.19750e-01	1.229e-02	Gamma
4.61380e-01	1.267e-02	Gamma
5.58020e-01	1.606e-01	Gamma
6.31820e-01	6.953e-02	Gamma
6.34390e-01	2.081e-02	Gamma
7.14350e-01	7.169e-02	Gamma
7.81260e-01	1.013e-02	Gamma
7.84770e-01	1.315e-02	Gamma
8.10350e-01	2.269e-02	Gamma
9.28850e-01	1.046e-02	Gamma
1.08519e+00	6.048e-02	Gamma
1.19326e+00	2.566e-02	Gamma
1.36840e+00	3.342e-02	Gamma
1.04705e-01	1.140e-02	Beta
1.08999e-01	2.257e-02	Beta
1.93622e-01	2.197e-02	Beta
2.36905e-01	7.991e-02	Beta
2.48500e-01	2.497e-02	Beta
4.19973e-01	7.112e-02	Beta
4.33978e-01	1.738e-02	Beta
4.36035e-01	1.848e-02	Beta
4.64789e-01	4.505e-02	Beta
4.90752e-01	1.748e-02	Beta
5.83711e-01	1.848e-01	Beta
8.38884e-01	2.048e-01	Beta
9.11722e-01	1.528e-01	Beta
1.01065e+00	2.897e-02	Beta
1.04417e+00	5.294e-02	Beta
2.23272e-05	1.275e-01	Auger electron
5.24635e-05	4.692e-02	Auger electron
1.15640e-03	3.947e-02	Auger electron
9.06608e-03	1.021e-02	Auger electron
1.99201e-01	2.012e-02	Conversion electron

 

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

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