<= Return to MIRDspec isotope database

Radionuclide Dosimetric Data Sheets

Erbium-169

Isotope:  Er-169
Atomic number (Z):  68
Mass number (A):  169
Neutron number (N):  101

Decay modes:  β-
Half-life:  9.4 [d]
Decay constant:  8.5346e-07 [1/s]
Daughters:  Tm-169 (100.0%)
Radioactive daughters:  None

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.10346 [MeV]
Mean photon energy:  6e-05 [MeV]
Air kerma rate constant, Γ₁₀:  1.116e-22 [Gy·m²/Bq·s]
Air kerma coefficient, K_air:  1.116e-22 [Gy·m²/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δ_wp:  1.658e-14 [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-:  1.658e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δ_p:  9.613e-18 [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/Er-169 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/Er-169 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/Er-169 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/Er-169 Summary Spectrum.csv

 

Energy [MeV]	Yield [#/nt] if > 0.01	Radiation type
1.38285e-05	2.616e+00	X-ray
9.81271e-02	4.500e-01	Beta
1.00819e-01	5.500e-01	Beta
2.06752e-05	1.433e-01	Auger electron
1.46376e-04	1.198e+00	Auger electron
2.55046e-04	4.576e-02	Auger electron
2.67541e-04	4.231e-01	Auger electron
1.25297e-03	3.266e-01	Auger electron
1.49922e-03	1.919e-02	Auger electron
6.54521e-03	3.522e-01	Conversion electron
8.41031e-03	9.623e-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