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Radionuclide Dosimetric Data Sheets
Einsteinium-253
Summary data
General
Classification
Isotope: Es-253
Atomic number (Z): 99
Mass number (A): 253
Neutron number (N): 154
Radioactive decay
Decay modes: α, Spontaneus fission
Half-life: 20.47 [d]
Decay constant: 3.9192e-07 [1/s]
Daughters: Bk-249 (100.0%), SF (8.9e-06%)
Radioactive daughters: Bk-249
Dosimetric constants
Mean alpha energy: 6.7335 [MeV]
Mean electron energy: 0.0022 [MeV]
Mean photon energy: 0.00084 [MeV]
Air kerma rate constant, Γ10: 4.653e-19 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 4.655e-19 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 1.079e-12 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 1.079e-12
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
3.525e-16 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.346e-16
[Gy·kg/Bq·s]
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/Es-253 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/Es-253 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/Es-253 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.84515e-05 |
7.241e-01 |
X-ray |
|
1.03798e-04 |
2.002e-01 |
Auger electron |
|
1.91472e-04 |
1.146e-01 |
Auger electron |
|
3.06058e-04 |
1.916e-01 |
Auger electron |
|
6.58562e-04 |
3.659e-02 |
Auger electron |
|
2.25473e-03 |
2.392e-02 |
Auger electron |
|
2.72823e-03 |
5.977e-02 |
Auger electron |
|
3.36040e-03 |
1.385e-02 |
Auger electron |
|
1.16602e-02 |
1.297e-02 |
Auger electron |
|
1.64960e-02 |
2.042e-02 |
Conversion electron |
|
6.59142e+00 |
6.594e-02 |
Alpha |
|
6.63254e+00 |
8.981e-01 |
Alpha |
|
1.05955e-01 |
6.594e-02 |
Alpha recoil |
|
1.06616e-01 |
8.981e-01 |
Alpha recoil |
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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