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Radionuclide Dosimetric Data Sheets
Einsteinium-250
Summary data
General
Classification
Isotope: Es-250
Atomic number (Z): 99
Mass number (A): 250
Neutron number (N): 151
Radioactive decay
Decay modes: Electron capture
Half-life: 8.6 [h]
Decay constant: 2.2388e-05 [1/s]
Daughters: Cf-250 (98.5%)
Radioactive daughters: Cf-250
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.3281 [MeV]
Mean photon energy: 1.2235 [MeV]
Air kerma rate constant, Γ10: 8.623e-17 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 8.623e-17 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 5.257e-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-:
5.257e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 1.960e-13
[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-250 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/Es-250 Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
7.45581e-05 |
6.367e+01 |
X-ray |
|
6.22658e-04 |
1.298e-02 |
X-ray |
|
3.86272e-03 |
4.753e-01 |
X-ray |
|
6.11799e-03 |
2.353e-02 |
X-ray |
|
1.31965e-02 |
7.011e-02 |
X-ray |
|
1.54368e-02 |
1.045e-01 |
X-ray |
|
1.56809e-02 |
9.166e-01 |
X-ray |
|
1.81403e-02 |
1.807e-02 |
X-ray |
|
1.85095e-02 |
1.916e-02 |
X-ray |
|
1.89423e-02 |
2.167e-02 |
X-ray |
|
1.90028e-02 |
2.002e-01 |
X-ray |
|
1.96961e-02 |
1.077e-01 |
X-ray |
|
1.97994e-02 |
4.117e-02 |
X-ray |
|
2.07498e-02 |
6.602e-01 |
X-ray |
|
2.09431e-02 |
7.810e-02 |
X-ray |
|
2.42552e-02 |
1.578e-01 |
X-ray |
|
2.44371e-02 |
2.972e-02 |
X-ray |
|
2.47741e-02 |
2.565e-02 |
X-ray |
|
2.50995e-02 |
3.345e-02 |
X-ray |
|
8.22820e-02 |
2.532e-02 |
Gamma |
|
8.50860e-02 |
1.051e-02 |
Gamma |
|
1.10388e-01 |
4.602e-01 |
X-ray |
|
1.15701e-01 |
7.119e-01 |
X-ray |
|
1.29279e-01 |
8.335e-02 |
X-ray |
|
1.30526e-01 |
1.647e-01 |
X-ray |
|
1.34020e-01 |
2.125e-02 |
X-ray |
|
1.34357e-01 |
4.411e-02 |
X-ray |
|
1.35378e-01 |
1.115e-02 |
X-ray |
|
1.40694e-01 |
4.530e-02 |
Gamma |
|
2.22993e-01 |
1.771e-02 |
Gamma |
|
2.46920e-01 |
3.650e-02 |
Gamma |
|
3.03410e-01 |
2.177e-01 |
Gamma |
|
3.49400e-01 |
2.015e-01 |
Gamma |
|
3.83700e-01 |
1.391e-01 |
Gamma |
|
7.12300e-01 |
1.309e-02 |
Gamma |
|
7.64200e-01 |
3.910e-02 |
Gamma |
|
8.10200e-01 |
8.902e-02 |
Gamma |
|
8.29000e-01 |
7.241e-01 |
Gamma |
|
8.63200e-01 |
4.992e-02 |
Gamma |
|
8.66700e-01 |
1.273e-02 |
Gamma |
|
1.14399e-04 |
1.727e+01 |
Auger electron |
|
1.92699e-04 |
1.028e+01 |
Auger electron |
|
2.11830e-04 |
7.942e-02 |
Auger electron |
|
3.35080e-04 |
1.686e+01 |
Auger electron |
|
6.60553e-04 |
3.075e+00 |
Auger electron |
|
2.33820e-03 |
1.302e+00 |
Auger electron |
|
2.79551e-03 |
5.326e+00 |
Auger electron |
|
3.45746e-03 |
1.282e+00 |
Auger electron |
|
4.21251e-03 |
8.320e-02 |
Auger electron |
|
5.06401e-03 |
5.556e-01 |
Conversion electron |
|
8.27800e-03 |
8.202e-02 |
Conversion electron |
|
9.08300e-03 |
1.456e-01 |
Conversion electron |
|
1.11700e-02 |
2.084e-02 |
Conversion electron |
|
1.17705e-02 |
1.240e+00 |
Auger electron |
|
1.43960e-02 |
1.189e-01 |
Conversion electron |
|
1.57280e-02 |
1.859e-01 |
Conversion electron |
|
1.57818e-02 |
6.668e-01 |
Auger electron |
|
1.65330e-02 |
4.614e-02 |
Conversion electron |
|
1.66740e-02 |
1.477e-02 |
Conversion electron |
|
1.74790e-02 |
3.808e-01 |
Conversion electron |
|
1.98491e-02 |
8.410e-02 |
Auger electron |
|
2.00460e-02 |
8.528e-02 |
Conversion electron |
|
2.08510e-02 |
8.672e-02 |
Conversion electron |
|
2.18460e-02 |
2.181e-02 |
Conversion electron |
|
2.27920e-02 |
3.123e-01 |
Conversion electron |
|
2.61640e-02 |
6.257e-02 |
Conversion electron |
|
2.92212e-02 |
9.532e-02 |
Conversion electron |
|
2.95550e-02 |
4.593e-02 |
Conversion electron |
|
3.03600e-02 |
6.839e-02 |
Conversion electron |
|
3.04800e-02 |
1.891e-02 |
Conversion electron |
|
3.12850e-02 |
1.244e-02 |
Conversion electron |
|
3.43250e-02 |
3.526e-02 |
Conversion electron |
|
3.56200e-02 |
2.051e-01 |
Conversion electron |
|
3.56730e-02 |
4.846e-02 |
Conversion electron |
|
3.64250e-02 |
5.168e-02 |
Conversion electron |
|
3.66712e-02 |
6.449e-02 |
Conversion electron |
|
3.76172e-02 |
2.019e-01 |
Conversion electron |
|
4.09892e-02 |
6.341e-02 |
Conversion electron |
|
4.17380e-02 |
2.200e-02 |
Conversion electron |
|
4.17750e-02 |
2.405e-02 |
Conversion electron |
|
4.27210e-02 |
7.446e-02 |
Conversion electron |
|
4.60930e-02 |
2.351e-02 |
Conversion electron |
|
5.04982e-02 |
4.457e-02 |
Conversion electron |
|
5.14232e-02 |
1.040e-02 |
Conversion electron |
|
5.39510e-02 |
1.094e-02 |
Conversion electron |
|
5.51700e-02 |
7.514e-02 |
Conversion electron |
|
5.56020e-02 |
1.653e-02 |
Conversion electron |
|
5.62350e-02 |
2.758e-01 |
Conversion electron |
|
5.65632e-02 |
7.064e-02 |
Conversion electron |
|
5.70400e-02 |
3.357e-02 |
Conversion electron |
|
5.90390e-02 |
8.809e-02 |
Conversion electron |
|
5.98440e-02 |
2.300e-02 |
Conversion electron |
|
6.04830e-02 |
5.058e-02 |
Conversion electron |
|
6.16670e-02 |
2.641e-02 |
Conversion electron |
|
7.39180e-02 |
8.501e-02 |
Conversion electron |
|
7.53082e-02 |
3.708e-02 |
Conversion electron |
|
7.71782e-02 |
7.712e-02 |
Conversion electron |
|
7.73810e-02 |
1.615e-02 |
Conversion electron |
|
7.73930e-02 |
3.747e-02 |
Conversion electron |
|
7.92310e-02 |
5.256e-02 |
Conversion electron |
|
7.99822e-02 |
3.047e-02 |
Conversion electron |
|
8.04120e-02 |
1.373e-02 |
Conversion electron |
|
8.22820e-02 |
2.889e-02 |
Conversion electron |
|
8.50860e-02 |
1.139e-02 |
Conversion electron |
|
8.68283e-02 |
2.758e-02 |
Auger electron |
|
8.73630e-02 |
5.123e-02 |
Conversion electron |
|
9.40562e-02 |
4.081e-02 |
Conversion electron |
|
9.83362e-02 |
1.194e-02 |
Conversion electron |
|
9.91600e-02 |
1.510e-02 |
Conversion electron |
|
1.06295e-01 |
1.609e-02 |
Auger electron |
|
1.11290e-01 |
4.838e-02 |
Conversion electron |
|
1.14647e-01 |
1.036e-01 |
Conversion electron |
|
1.15452e-01 |
1.306e-02 |
Conversion electron |
|
1.35590e-01 |
2.908e-02 |
Conversion electron |
|
1.40694e-01 |
1.090e-02 |
Conversion electron |
|
1.67780e-01 |
1.774e-01 |
Conversion electron |
|
2.13770e-01 |
2.137e-02 |
Conversion electron |
|
2.77363e-01 |
3.318e-02 |
Conversion electron |
|
2.78168e-01 |
1.201e-02 |
Conversion electron |
|
2.98306e-01 |
1.230e-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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