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Radionuclide Dosimetric Data Sheets

Erbium-172

Summary data

General

Classification

Isotope:  Er-172
Atomic number (Z):  68
Mass number (A):  172
Neutron number (N):  104

Radioactive decay

Decay modes:  β-
Half-life:  49.3 [h]
Decay constant:  3.9055e-06 [1/s]
Daughters:  Tm-172 (100.0%)
Radioactive daughters:  Tm-172

Dosimetric constants

Mean alpha energy:  0.0 [MeV]
Mean electron energy:  0.13865 [MeV]
Mean photon energy:  0.51657 [MeV]
Air kerma rate constant, Γ10:  1.976e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair:  1.976e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or electrons), Δwp:  2.221e-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-:  2.221e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp:  8.276e-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-172 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-172 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/Er-172 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/Er-172 Summary Spectrum.csv

 

Energy [MeV]

Yield [#/nt] if > 0.01

Radiation type

1.34026e-05

6.703e+00

X-ray

1.43482e-03

1.798e-02

X-ray

7.16830e-03

6.933e-02

X-ray

8.11340e-03

4.724e-02

X-ray

8.45978e-03

1.181e-02

X-ray

4.98586e-02

1.807e-01

X-ray

5.08500e-02

3.194e-01

X-ray

5.74128e-02

3.347e-02

X-ray

5.76228e-02

6.470e-02

X-ray

5.91642e-02

1.437e-02

X-ray

5.96920e-02

2.694e-02

Gamma

6.81070e-02

3.292e-02

Gamma

1.27805e-01

2.126e-02

Gamma

2.02724e-01

1.031e-02

Gamma

3.83501e-01

2.349e-02

Gamma

4.07338e-01

4.210e-01

Gamma

4.46025e-01

2.955e-02

Gamma

4.75445e-01

1.040e-02

Gamma

6.10062e-01

4.420e-01

Gamma

7.87977e-02

4.329e-01

Beta

1.02411e-01

4.329e-01

Beta

1.21896e-01

3.732e-02

Beta

1.44795e-01

3.079e-02

Beta

3.01581e-01

6.531e-02

Beta

2.06752e-05

3.082e-01

Auger electron

1.48059e-04

2.980e+00

Auger electron

2.04004e-04

3.229e-01

Conversion electron

2.23890e-04

9.540e-02

Auger electron

2.47711e-04

5.124e-01

Auger electron

8.32069e-04

8.588e-02

Auger electron

1.19446e-03

1.155e+00

Auger electron

1.36873e-03

5.469e-02

Auger electron

3.03600e-03

2.010e-02

Conversion electron

5.64001e-03

3.941e-01

Auger electron

7.07341e-03

1.413e-01

Auger electron

8.53806e-03

1.284e-02

Auger electron

8.61901e-03

2.687e-01

Conversion electron

1.97406e-02

1.979e-02

Conversion electron

2.07319e-02

2.487e-02

Conversion electron

2.75049e-02

1.093e-02

Conversion electron

4.07026e-02

2.278e-02

Auger electron

4.84128e-02

1.158e-02

Auger electron

4.96110e-02

4.465e-02

Conversion electron

5.78269e-02

1.101e-02

Conversion electron

5.80260e-02

3.703e-02

Conversion electron

6.83170e-02

2.420e-02

Conversion electron

3.47850e-01

1.990e-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

 

 

 

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