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Radionuclide Dosimetric Data Sheets
Erbium-167m
Summary data
General
Classification
Isotope: Er-167m
Atomic number (Z): 68
Mass number (A): 167
Neutron number (N): 99
Radioactive decay
Decay modes: Internal transition
Half-life: 2.269 [s]
Decay constant: 3.0549e-01 [1/s]
Daughters: Er-167 (100.0%)
Radioactive daughters: None
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.11114 [MeV]
Mean photon energy: 0.09667 [MeV]
Air kerma rate constant, Γ10: 3.457e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 3.457e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.781e-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-:
1.781e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.549e-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/Er-167m 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/Er-167m Summary 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/Er-167m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.35418e-05 |
4.456e+00 |
X-ray |
|
1.36790e-03 |
1.077e-02 |
X-ray |
|
6.93539e-03 |
3.613e-02 |
X-ray |
|
7.81979e-03 |
4.165e-02 |
X-ray |
|
4.82994e-02 |
5.373e-02 |
X-ray |
|
4.92265e-02 |
9.535e-02 |
X-ray |
|
5.57778e-02 |
1.919e-02 |
X-ray |
|
2.07801e-01 |
4.159e-01 |
Gamma |
|
1.98170e-05 |
2.141e-01 |
Auger electron |
|
1.41501e-04 |
2.007e+00 |
Auger electron |
|
1.98658e-04 |
7.182e-02 |
Auger electron |
|
2.39378e-04 |
3.422e-01 |
Auger electron |
|
7.15053e-04 |
5.237e-02 |
Auger electron |
|
1.13562e-03 |
7.494e-01 |
Auger electron |
|
1.31181e-03 |
3.722e-02 |
Auger electron |
|
5.53040e-03 |
2.566e-01 |
Auger electron |
|
6.90682e-03 |
9.163e-02 |
Auger electron |
|
1.50227e-01 |
1.978e-01 |
Conversion electron |
|
1.98085e-01 |
2.446e-02 |
Conversion electron |
|
1.98526e-01 |
1.665e-01 |
Conversion electron |
|
1.99454e-01 |
1.023e-01 |
Conversion electron |
|
2.06005e-01 |
7.343e-02 |
Conversion electron |
|
2.07801e-01 |
1.961e-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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